Showing posts with label Belize. Show all posts
Showing posts with label Belize. Show all posts

Tuesday, 12 April 2022

Fisherman attacked by Crocodile in Belize.

A man is being treated for injuries to the face after being attacked by a Crocodile while spear fishing on Friday 8 April 2022. Joshua Young of Caye Caulker, an offshore island in the Caribbean Sea, made it back to shore safely after being attacked by the Animal and was taken to the Karl Heusner Memorial Hospital for treatment. He is described as being in a stable condition.

 
The location of Caye Caulker on the coast of Belize. Google Maps.

Two types of Crocodile are commonly found in Belize, the American Crocodile, Crocodylus acutus, and the Morelet’s Crocodile, Crocodylus moreletii, both of which are large enough to present a threat to Humans. 

The Morelet's Crocodile reaches about 3 m in length, and while generally not considered a danger to Humans, at least 12 fatal attacks by this species have been recorded, with large prey such as Cattle and Tapirs often taken by fully grown adults. However, whilst fairly common in Belize, the Morlet's Crocodile is essentially a freshwater species, and while it will occasionally enter brackish marshes or lagoons, is unlikely to be found in the open marine waters around Caye Caulker.

 
A Morelet's Crocodile in Belize. The Croc Docs.

The American Crocodile, Crocodylus acutus, is found throughout the Caribbean, Central America, and parts of northern South America, southern and western Mexico, and parts of Florida. American Crocodiles are unusual in that, while they will enter freshwater environments, their favoured habitat is saltwater lagoons, mangroves, and small islands, a habit they share with only one other Crocodile species, the Indo-Pacific Saltwater Crocodile, Crocodylus porosus. This makes the American Crocodile a much more likely candidate for the attack on Mr Young.

 
An American Crocodile, Crocodylus acutus, in Placencia Lagoon, Belize. Crocodile Research Coalition.

The species can grow quite large, with mature males often exceeding 4 m in length and the largest measuring slightly over 6 m, but are not particularly agresive towards Humans as long as they are left alone. They predominantly feed on small Mammals, Birds, Fish, and Turtles, but have been known to take larger prey on occasion, including Cattle. American Crocodiles are classified as Vulnerable under the terms of the International Union for the Conservation of Nature's Red List of Threatened Species.

The Belize Forest Department has warned people against feeding Crocodiles, especially around tourist areas, as this can lead to them becoming aclimatised to Humans, leading to further conflict. They have also warned fishermen to be careful of how they dispose of Fish waste, which can also lead to Crocodiles associating Humans with food.

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Thursday, 16 April 2020

Magnitude 6.0 Earthquake beneath the Gulf of Honduras.

The United States Geological Survey recorded a Magnitude 6.0 Earthquake at a depth of 10.0 km, beneath the Gulf of Honduras, roughly 55km to the northeast of the Honduran island of Guanaja, slightly before 2.05 am local time (slightly before 8.05 am GMT) on Thursday 16 April 2020. The quake was felt across much of northern Honduras, Belize, and the eastern Yucatan Peninsula of Mexico, though there are no reports of any major damage or injuries.

The approximate location of the 16 April 2020 Gulf of Honduras Earthquake. USGS.

The Earthquake occurred on the Swan Island Transform Fault, which separates the North American Plate to the North from the Caribbean Plate to the South. The Swan Island Transform Fault runs from Guatemala in the west to the Mid-Cayman Spreading centre in the east, with the Caribbean Plate moving eastward relative to the North American Plate. This creates stress along the margin, as the rocks of the two plates continually stick together, then break apart abruptly, creating shockwaves we experience as Earthquakes.

Witness accounts of Earthquakes can help geologists to understand these events, and the structures that cause them. The international non-profit organisation Earthquake Report is interested in hearing from people who may have felt this event; if you felt this quake then you can report it to Earthquake Report here.

See also...

https://sciencythoughts.blogspot.com/2020/04/microbial-life-in-post-impact-chicxulub.htmlhttps://sciencythoughts.blogspot.com/2020/01/magnitude-77-earthquake-between-cuba.html
https://sciencythoughts.blogspot.com/2018/09/magnitude-52-earthquake-in-monte-cristi.htmlhttps://sciencythoughts.blogspot.com/2018/06/landslide-kills-four-artisanal-gold.html
https://sciencythoughts.blogspot.com/2018/06/magnitude-47-earthquake-in-monte-plata.htmlhttps://sciencythoughts.blogspot.com/2018/01/magnitude-76-earthquake-off-northeast.html
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Monday, 30 December 2019

A jadeite gouge with a wooden handel from the Classical Mayan Ek Way Nal underwater site in southern Belize

The ancient Maya used jadeite objects in burials, caches and other ceremonial contexts from the Middle Preclassic to Postclassic periods (1000 BC–AD 1500). During the Classic Period (AD 300–900), the use of high-quality translucent jadeite was typically reserved for unique and elaborate jadeite plaques, figurines and earplugs (earrings) for royalty and other elites. Craft workers closely affiliated with Maya royalty probably finished making these jadeite objects in either palace workshops or household workshops in lowland Maya cities. Debitage from sawing jadeite, for example, was recovered from above King Pacal’s tomb at Palenque, in southern Mexico, and in other high status contexts. Highly crafted jadeite objects were destined for use in dynastic Maya ceremonies, as gifts to other leaders to solidify alliances, or as burial offerings to accompany dynastic and other elites. The largest jadeite artifact (at 4.4kg) is a depiction of the sun god from a royal tomb at Altun Ha, Belize. An incised jadeite plaque from a royal burial at Nim li Punit, in Belize, resembles chest ornaments worn by dynastic leaders, who are depicted and described in hieroglyphs on stelae engaging in ritual scattering of copal incense. Jadeite had a ceremonial function as early as the Middle Preclassic (from 1000 to 300 BC), as evidenced at Ceibal, Guatemala, where dozens of jadeite and other greenstone celts (axes) were placed in caches under public plazas. 

In contrast, beads and celts made from jadeite and other greenstones of varying quality were widely distributed at Tikal, Cancuen and other lowland cities, being found in archaeological contexts associated with both elites and commoners. Even at small Maya communities, such as Ceren, nearly every household had a greenstone celt. This pattern of access indicates that jadeite was available at local marketplaces, along with other trade and craft goods and resources from surplus household production. Jadeite beads, and possibly celts, may have been used as a medium of exchange. It has been demonstrated that in Middle Preclassic caches at Ceibal, a total of 23 per cent of celts made from greenstone or other rocks, including two from jadeite, had been used for wood-working prior to their deposition, whereas the other celts, including those of blue-green translucent jadeite, were unused. This suggests that, except for the finest green-blue translucent jadeite, some celts were similarly used by the Classic Maya for utilitarian purposes.

In a paper published in the journal Antiquity on 10 April 2019, Heather McKillop of the Department of Geography & Anthropology at Louisiana State University, George Harlow of the Department of Earth & Planetary Sciences at the American Museum of Natural History, April Sievert of the Department of Anthropology at Indiana University, Bloomington, Wayne Smith of the Department of Anthropology at Texas A&M University, and Michael Wiemann of the Center for Wood Anatomy Research at the Forest Products Laboratory, present the first report of a Maya jadeite tool, a gouge, found with its associated wooden handle (Ancient Maya stone tools are seldom recovered with their original wooden handles, as organic preservation is dependent on specific environmental conditions). The tool was recovered from Ek Way Nal, an underwater site in southern Belize, one of 110 sites comprising the Paynes Creek Salt Works. The discovery of a jadeite tool in a utilitarian context is noteworthy, as high-quality translucent jadeite is normally associated with ritual or ceremonial contexts in the Maya area. The Ek Way Nal jadeite tool comes from a salt kitchen, a location that contrasts with the more typical Maya burial and cache contexts for translucent blue-green jadeite artifacts.

Map of the southern Belize survey area showing the location of EkWay Nal in the Punta Ycacos lagoon. Inset shows location of Ek Way Nal in the Maya area. Mary Lee Eggart in McKillop et al. (2019).

The Ek Way Nal tool is made of exceptionally high-quality jadeite, which is surprising given its utilitarian context. Jadeite is a hard rock that varies from translucent to opaque. The translucent appearance of the Ek Way Nal tool results from tightly woven grains in the material, which make the jadeite particularly durable and, therefore, even more desirable for use as a tool. At EkWay Nal, salt workers probably obtained the jadeite gouge as part of a surplus household economy that related to the production and distribution of salt. The gouge, along with celts made from jadeite and other minerals found elsewhere at the site, formed part of this economy.

The Paynes Creek SaltWorks comprised dozens of wooden salt kitchens built by the Classic Maya (AD 300–900) along the shoreline of seasonally hyper-saline Punta Ycacos Lagoon. Brine was boiled in ceramic containers over fires to make salt, leaving behind briquetage (a coarse ceramic material used to make evaporation vessels and supporting pillars used in extracting salt from brine or seawater) as evidence. The thatched, wooden salt kitchens allowed for year-round production, as well as the storage of wood fuel, pots and salt. This interpretation is based on modern salt-making at Sacapulas in highland Guatemala, where salt production inside dedicated buildings occurs mainly during the dry season, but also continues during the rainy season. In southern Belize there is considerable rainfall year-round, making indoor salt production desirable.

Following their abandonment sometime after the end of the Classic Period, rapid sealevel rise flooded the salt works, leaving them underwater and invisible in the modern Mangrove landscape. Red Mangroves, Rhizophora mangle,respond to more gradual sea-level rise by growing taller to keep their leaves above water; in turn, this propagates the formation of Mangrove peat. The depth of the peat can be used as a proxy for measuring sea-level rise. There is over 5 m of Mangrove peat below the sea floor in the lagoon, indicating that prior to the Maya Classic Period, seas rose and then stabilised, creating land. The peat also creates an anaerobic matrix that preserves wood and other organic remains. Mapping at 70 underwater sites has recorded over 4000 wooden posts defining rectangular buildings, as well as other wooden objects preserved in peat below the sea floor. The sites are concentrated in a 5 km² area in Punta Ycacos Lagoon, with evidence of contemporaneous settlement elsewhere in the coastal area from the Middle Preclassic through the Postclassic.

Jadeite outcrops and quarries have been identified along both sides of the Motagua River in Guatemala. Jadeite is one of several minerals present in the outcrops. Abrasive blocks used for shaping stone have been found at quarry sites in the middle Motagua Valley. Elite and commoner householders in nearby communities were involved in shaping raw jadeite using percussion methods, as well as in making jadeite beads, celts and plaques by sawing and drilling. Blanks or preforms (larger pieces of material from which stone blades or other tools can be broken off), as well as finished jadeite objects from the outcrops and associated sites were widely traded to lowland Maya cities in Guatemala, Belize, Honduras and Mexico, where value was added by elite specialists who further crafted the jadeite into elaborate objects. These were gifted among dynastic and other nobles and deposited in caches and burials. Lowland Maya commoners, however, also had access to jadeite and other valuable commodities through marketplace trade, although not in the same abundance or quality as found in dynastic burials and caches.

Some Maya jadeite objects were produced in commoner household workshops in the Maya Lowlands. Jadeite objects were considered valuable commodities that could be stored and traded or gifted, for example, in times of crop failure. Workshops at Cancuen, a riverine port in the Guatemalan interior, produced jadeite beads and earplugs; elites and commoners carried out production at the Motagua River valley outcrops and at some workshops, including at Cancuen, although the Cancuen elite may have controlled the acquisition of the raw material and its distribution to other communities. Canoe trade down the Motagua River and along the Caribbean coast of Belize provided direct access to jadeite for coastal communities, including the salt workers at Ek Way Nal. Jadeite beads, for example, were interred in graves at the nearby trading port on 

The underwater site of Ek Way Nal is located in the main channel of Punta Ycacos Lagoon, a large salt-water system ranging in depth from a few centimetres to over 2 m. A systematic survey was carried out by a team of archaeologists who traversed sections of the lagoon side by side on research flotation devices, marking the location of wooden posts and artefacts on the sea floor. n shallow water, survey flags were placed to mark post and artifact locations. Each location was then mapped individually using a total station and entered into the project Geographical Information System. Wood samples for radiocarbon dating and tree-species identification were cut from the top of 204 posts using a stainless steel kitchen knife (seven were too hard to sample); 109 were identified in the field as being made from Palmetto Palms, Acoelorrhaphe wrightii. In order to obtain wood free from burrowing Sea Worms, the Mangrove peat was cleared from around a post; samples of preserved wood from the posts below the sea floor were then taken. These wood samples were placed in bags of fresh water, desalinated by periodic water changes and stored for analyses.

Survey at Ek Way Nay on research flotation devices, with flags marking the locations of sea-floor wooden posts. Heather McKillop in McKillop et al. (2019).

Clearance of peat from around post 255 revealed a jadeite gouge and its associated wooden handle. The objects were discovered leaning against a post inside a wooden salt kitchen. The tool may have originally been placed against the post, or it could have fallen from rafters above or from a shelf, or from a hook on the post. Post 255 is of a local hardwood, Prickly Yellow, Zanthoxylum sp., which is commonly used for modern building construction in southern Belize. Despite the high quality of the jadeite from which the gouge was made, the find’s context is distinctly utilitarian.

The jadeite gouge after discovery. Heather McKillop in McKillop et al. (2019).

Radiocarbon dates on post 255 and on the wooden handle place both in the Late (600–800 AD) to Terminal (800–900 AD) Classic Periods. An Accelerator Mass Spectrometry measurement on the handle gives a date of 660–810 AD, while a standard radiocarbon date on post 255 provides an age of 680–970 AD. A Late Classic date range for the site is further supported by Late to Terminal Classic pottery, including small quantities of chronologically distinctive pottery, such as Belize Red dishes and Warrie Red jars with characteristic stamped decorations.

Wooden handle for the jadeite gouge. Heather McKillop in McKillop et al. (2019).

The jadeite gouge was analysed at the American Museum of Natural History to determine the object’s chemical composition and mineral phases. The object was examined with a Cameca SX100 electron microprobe  including backscattered electron images, Zeiss EVO 60  Scanning Electron Microscope with Bruker energy-dispersive X-ray spectroscopy) and Rigaku DMAX/Rapid X-ray microdiffraction. These analyses reveal that the tool is of exceptionally high quality and is compositionally consistent with jadeite samples from the Motagua River valley in Guatemala. To view the mineral microtexture and to provide a suitable sample for microprobe analysis, a small piece was removed from the non-display side of the butt end and polished. The gouge was determined to be
of high quality, with around 98% jadeite by volume, plus some diopside, hedenbergite, and aegirine. Other mineral phases include analcime (along some grain boundaries, or as small inclusions), omphacite (a pyroxene phase that is about half diopside and half jadeite), barian K-feldspar, zircon and titanite. This is consistent with a Guatemalan source, and resembles some of the very fine Olmec-like jade artefacts. As an example of jadeite jade, the gouge approaches the quality of so-called ‘gem grade’ material, in that it has a translucent blue-green colour often associated with objects from Formative (Olmec) sites. Translucency is conferred by a tight microstructure of intersecting jadeite grains; this structure also confers mechanical durability.

Petrologically, the artefact is a jadeitite with little other than pyroxene with subtle and complex zoning of tightly intergrown jadeite grains and rare small zircon and titanite grains. It is interspersed with veins of more evolved (diopside-richer) jadeitite and late complex veins of varying jadeite and omphacite compositions, with occasional barian K-feldspar grains. The high-quality jadeite used to make the Ek Way Nal gouge is rare, but does occur in the Guatemalan source area. Moreover, as mica, lawsonite and quartz were not detected in the composition of the jadeite, it is impossible to determine from which side of the Motagua Fault the jadeitite was sourced.

Thin slices of the wooden handle were taken using a backed razor. Analysis of the wood’s structure shows that the handle is made from Honduras Rosewood, Dalbergia stevensonii, as indicated by the presence of characteristic storied rays. Honduras Rosewood is locally available in the deciduous forest on the south side of the Deep River, and more generally in southern Belize.

The rosewood handle was conserved using the polymer method at Texas A&M University. To provide a digital record, the wooden handle and jadeite gouge were imaged separately using a NextEngine 3D desktop scanner in the Digital Imaging and Visualization in Archaeology Laboratory at Louisiana State University. As with previous waterlogged finds from the Paynes Creek Salt Works, printed replicas were made from the 3D scans for use in exhibitions and for public outreach.

 Drawings of the gouge and handle. Mary Lee Eggart in McKillop et al. (2019).

Questions regarding the jadeite artifact include the extent to which its use may have left traces along the working edge, the character of that wear and the presence of hafting traces. All of these lines of evidence may contribute towards understanding how the tool was used. The artefact resembles a gouging tool that would be used to make wide grooves, based on morphology. As with any stone tool created by grinding and abrasive polishing, it is difficult to distinguish between manufacturing- and use-related wear. The distal end of the tool has been ground and polished to a smooth surface. Both the right lateral edges of faces A and C are reflective and smooth. The opposite two edges (left lateral edges) are smooth only near the tip, and display considerable crushing and pecking, especially near the proximal end. A unidirectional grinding/abrasive action has produced the concave distal end of the tool. Clear directionality in wear parallel to the long axis of the piece is macroscopically visible. Grinding and abrading to shape the tool has resulted in highly polished surfaces on all faces at the distal end. More shaping characterises the distal end of the tool on faces A and B, with less shaping and grinding on faces C and D. The sides have a matte polish that reflects less use than the deeper, central part of the groove. As the groove deepened, it may have been easier for the manufacturer to control the motion of the abrasives used in its creation. Therefore, the bottom of the groove has a more homogeneous surface than its sides.

Drawing of jadeite gouge showing locations of wear from hafting to the wooden handle and from use. April Sievert in McKillop et al. (2019).

The edge rounding on the distal end is associated with a light matte polish and a slight bevel, just posterior to the working bit. If the tool was used in woodworking, a bright, spreading polish, similar to the hafting traces, would be expected. Instead, the wear is neither a bright nor as well developed as that generated from contact with the haft. The gouge, although bearing evidence of mechanical use in the form of hafting traces on the proximal end, and a wear trace along the dorsal side of the working edge, was therefore not used to carve wood. The polish and edge modification at the tip indicate directionality perpendicular to the working edge. No distinctive polish or use-related contact is visible on face A, other than a spot of polish at the intersection of the left lateral edge and the bit. This feature runs parallel to the long axis, with visible directionality. This spot of polish might indicate contact with wood, but could also result from manufacturing. The jadeite gouge does not appear to have been used on a particularly hard material, nor does it appear to have been used primarily for woodworking. Other uses are possible but yet to be determined.

Recovery of the jadeite gouge and handle at the Ek Way Nal salt works emphasises the probability that jadeite and other stone tools were fitted with wooden handles, which have not survived at most Maya sites. The use of jadeite as a utilitarian tool in a salt works indicates that even exotic materials, which often require expertise to fashion into tools, were selected for their hardness. Although the gouge was probably not employed in working wood or hard materials, it may have been used in other activities at the salt works, such as scraping salt, cutting and scraping fish or meat, or cleaning calabash gourds. The jadeite tool may have been obtained by the salt workers travelling to regional marketplaces with their salt cakes and salted fish. Alternatively, the salt workers or other mariners may have travelled to the Motagua River, which is only 70km by water, and then upriver to the jadeite outcrops.

Artistic depictions, boat models from the salt works and elsewhere and settlement on offshore islands also indicate the use of boat and canoe navigation dating to the Classic Period. The wooden canoe paddle from the K’ak’Naab’ site and a canoe from the Eleanor Betty site, two other Late Classic sites at the Paynes Creek Salt Works, provide primary evidence of boat travel in the Maya area and specifically at the Paynes Creek Salt Works.

A variety of non-local goods from Ek Way Nal and other sites that comprise the Paynes Creek Salt Works include figurine whistles and unit-stamped pottery from nearby inland sites, such as Lubaantun. Belize Red pottery came from farther away in the Belize River Valley; chert was probably sourced from the high-quality outcrops in northern Belize and obsidian came from the Maya highland sources of Ixtepeque and El Chayal. The salt workers produced salt that they traded at regional markets in southern Belize, acquiring other commodities in return. Some goods may have been obtained during boat trips to the Motagua outcrops or from coastal traders who stopped at the nearby trading port of Wild Cane Cay. he salt workers, for example, obtained celts made from jadeite and other rocks that were at outcrops along the Motagua River.

Jadeite celts (75 per cent jadeite and 25 per cent omphacite) from EkWay Nal: (A) Specimen 60 EE (fragment); (B) Specimen 60 SSSS; (C) Specimen 60 G. Cheryl Foster in McKillop et al. (2019).

Salt was important to the Maya and other ancient civilisations as a dietary supplement and for the preservation of fish. Salt cakes were a commodity traded at Maya marketplaces, as still practised today by modern salt makers in the Maya highlands and elsewhere. Standard-sized salt cakes were traded both locally and regionally as currency equivalencies; they could be stored, along with salted fish, for later use, acting as a risk management strategy to offset fluctuations in food availability. Marketplace trade of staple goods and resources made both locally and farther afield is documented at Maya cities, such as Caracol and Tikal, as well as in smaller communities.

By the Late Classic Period in the Maya lowlands, multiple spheres of local and long-distance exchange had developed for the acquisition of goods and resources. Elaborate objects made of valuable imported materials circulated among the dynastic Maya rulers of lowland polities, and were used as gifts to create and maintain political alliances. Marketplace trade provided a venue for the exchange of surplus household craft production, as well as ritual and finer goods, including beads and celts made from jadeite and other greenstones. The largest quantities of exotic materials and highly crafted goods were concentrated in city centres amongst the royalty. The plaque from Nim li Punit, site only a short distance from the Paynes Creek Salt Works, provides an example of this. While Nim li Punit would have been one of the marketplace destinations for coastal salt, the plaque was probably acquired through elite gifting.

The depositional context of the Ek Way Nal gouge in a salt kitchen demonstrates that high-quality jadeite was not reserved for, or limited to, elite usage. Mineralogical and use wear analyses of the gouge show that commoners also had access to the highest-quality jadeite and that the object was used in activities relating to salt making. If not obtained through local marketplace trade, jadeite may have been transported by merchants travelling along the coastal canoe route from the Motagua River valley quarries, or have been directly procured by the salt producers or their delegates.

Without the associated wooden handle and microscopic evidence that the tool had been used before deposition, it may have been viewed as representing a ritual deposit of high quality jadeite. The translucent appearance of the almost-pure jadeite, which results from the tight microstructure of intersecting jadeite grains, made the material highly durable and desirable as a working implement. Evidently, variability in the quality and translucency of jadeite and other greenstones were important factors in the selection of raw material for making tools.

While jadeite gouges or celts are not typically part of the brine-boiling process at salt works, a greenstone celt was found in a cache at Marco Gonzalez on Ambergris Cay, a community that practised salt making, among other activities. The Ek Way Nal gouge and the other celts do not resemble the anvils or smooth stones used by some potters or salt workers to make pottery vessels for boiling brine. Awooden pottery paddle from the Chak Te’el K’in site, however, indicates the paddle and anvil method was used at the Paynes Creek Salt Works. In this method, a pot was formed by holding a smooth stone or anvil on the inside of a clay pot and hitting the outside of the pot with a wooden paddle to shape it.

The salt workers were successful entrepreneurs who were able to obtain high-quality tools for their craft through the production and distribution of salt. A basic biological necessity that was in demand for the Maya diet, salt was also a storable form of wealth and an important preservative for fish and meat. The choice of high-quality materials, such as jadeite and rosewood, for use in utilitarian tools, demonstrates that the salt workers played an important role in the Classic Maya marketplace economy.

See also...

https://sciencythoughts.blogspot.com/2019/11/archaeologists-discover-new-nazca.htmlhttp://sciencythoughts.blogspot.com/2018/08/projectile-points-from-pre-clovis.html
http://sciencythoughts.blogspot.com/2017/03/salmonella-enterica-enteric-fever.htmlhttp://sciencythoughts.blogspot.com/2016/05/decapod-crustaceans-from-tarioba-shell.html
http://sciencythoughts.blogspot.com/2015/11/genotyping-500-year-old-inca-child-mummy.htmlhttp://sciencythoughts.blogspot.com/2015/04/late-pleistocene-lithic-artefacts-from.html
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Sunday, 15 April 2018

Copelatus yaguarete: A new species of Diving Beetle from Belize.

Diving Beetles (Dytiscidae) are often largish predatory Beetles with an aquatic lifestyle. Both the adults and larvae are predatory, though they are otherwise quite different. The young are aggressive shrimplike animals that emerge from eggs laid on plant stems. When fully grown these pupate in mud (above the water table), emerging as oval, brownish Beetles, capable of both flying to disperse and diving to lay eggs and feed. Both adults and young deliver a powerful bite, and inject digestive enzymes into their prey, which can include other Insects, Crustaceans, Worms, Leeches, Mollusks, Tadpoles and small Fish. The Beetles then feed by sucking fluids out of their victims. Members of the genus Copelatus are found throughout North, South and Central America, as well as the islands of the Caribbean. This is an extremely large genus, with a current total of 439 described species, although the majority of these are island endemics (i.e. species found only on a single island) from the Antilles.

In a paper published in the Belgian Journal of Entomology on 7 March 2018, Kevin Scheers of the Research Institute for Nature and Forest describes a new species of Copelatus from the Cockscomb Basin Wildlife Sanctuary in Belize, Central America.

The new species is named Copelatus yaguarete, meaning 'Jaguar', in reference to the Cockscomb Basin Wildlife Sanctuary, which was set up specifically to provide a safe environment for these Cats. The species was found at two locations within the park, in puddles close to the Tiger Fern Double Waterfall and on the trail from the waterfall to to Ben’s Bluff, at altitudes of 140 and 100 m above sealevel respectively. The Beetles range from 5.55 to 5.90 mm in length and 2.70 to 2.95 mm in width, and are brown in colour with yellow markings and pale legs.

Copelatus yaguarete, male specimen in dorsal view. Scheers (2018).

See also...

http://sciencythoughts.blogspot.co.uk/2018/02/amplectister-tenax-new-species-of-clown.htmlhttp://sciencythoughts.blogspot.co.uk/2018/01/cis-mooihoekite-new-species-of-minute.html
http://sciencythoughts.blogspot.co.uk/2017/12/elonus-gruberi-new-species-of-ant-like.htmlhttp://sciencythoughts.blogspot.co.uk/2017/11/spinotoma-ruicheni-new-species-of-wedge.html
http://sciencythoughts.blogspot.co.uk/2017/10/eurypeza-aurora-new-species-of-scarab.htmlhttp://sciencythoughts.blogspot.co.uk/2017/10/lamellothyrea-isimangalis-new-species.html
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Monday, 14 August 2017

Cinnamomum bladenense: A new species of Cinnamon from southern Belize.

Cinnamons, Cinnamomum spp., are tropical trees in the Laurel Family, Lauraceae, best known for their aromatic bark, which is widely used to flavour food. There are currently about 350 known species of Cinnamon tree, most of which are found in tropical Asia, though 47 species have been described from the tropical forests of Central and South America.

In a paper published in the journal PhytoKeys on 7 June 2017, Steven Brewer of the Belize Foundation for Research and Environmental Education, and Gail Stott of the Department of Plant Sciences at the University of Oxford, describe a new species of Cinnamon from the Bladen Nature Reserve in southern Belize.

The new species is named Cinnamomum bladenense, where ‘bladenense’ means ‘from Bladen’ in reference to the Bladen Nature Reserve (this reserve in turn takes its name from the Bladen River, though the ultimate derivation of the name is unknown). It is a tall canopy tree (unusual for a Cinnamon) reaching 25 m in height, with flowers unusually small for the genus. It has a straight, round, trunk supported by buttress roots, the bark is grey with a pinkish cast, which when damaged reveals a pinkish brown under-layer with a strong soapy odour, reminiscent of a bathroom cleaner. The leaves are waxy, 35-86 mm in length and 11-31 mm wide, flowers are brown-to-black, roughly 5 mm in length and born on leaf axils 40-80 mm in length and covered in grey hairs. 

Diagnostic vegetative characters of Cinnamomum bladenense. (A) Branch showing adaxial surface and variation of leaf sizes within branches. (B) Abaxial surface of leaves showing matte green laminae and prominent midvein and secondary venation. (C) Young twigs moderately and minutely sericeous with whitish buds. (D), (E) From the base of the same leaf lamina, respectively, adaxial surface of secondary vein axils not ampullous, abaxial surface of secondary veins barbellate and plane with the lamina surface. Steven Brewer in Brewer & Stott (2017).

The species is described from less than ten trees found growing on a pair of limestone ridges (an unusual location for a Cinnamon) south of the Bladen River. These locations are slightly upstream of the stretch where the river descends onto the coastal plain, and are on steep, well drained slopes in semi-evergreen forest. No further trees were found in the Bladen Nature Reserve, but similar environments are known to the southwest, close to the border with Guatemala, and to the northeast along the foothills of the Maya Mountains, as far as the southeastern portion of the Cockscomb Basin. For this reason the conservation status of Cinnamomum bladenense is unknown, though Brewer and Stott note that while the Bladen Nature Reserve is theoretically protected, it is prone to illegal logging and burning.

See also...

http://sciencythoughts.blogspot.co.uk/2017/04/heliconia-berguidoi-new-species-of.htmlhttp://sciencythoughts.blogspot.co.uk/2015/02/trying-to-save-sinkhole-cycad.html
http://sciencythoughts.blogspot.co.uk/2014/05/how-pinuela-affects-soil-communities-in.htmlhttp://sciencythoughts.blogspot.co.uk/2014/03/a-new-species-of-hydrangea-from-mexico.html
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Friday, 13 February 2015

Trying to save the Sinkhole Cycad.


Cycads are an ancient group of Gymnosperm Plants thought to be among the closest surviving relatives of Flowering Plants. They originated in the Palaeozoic, and were once one of the most abundant plant groups on Earth, but were almost wiped out at the end of the Mesozoic, with all Cycads alive today being the result of a post-Cretaceous radiation. There are 331 known living species of Cycads, the majority of which are listed on the International Union for the Conservation of Nature’s Red List of Threatened Species, with more than 75% of known species currently thought to be threatened with extinction. 

Cycads are threatened by habitat loss and invasive species (particularly Insects), but are considered to be most at risk due to over-collecting for horticulture. The distinctive evolutionary history of the plants, combined with their attractive appearance and drought tolerance, makes them highly sought after by plant collectors, however they are slow growing and difficult to raise from seed, resulting in a high market value for mature plants, which leads to many being taken from the wild. Four species of Cycad are considered to be extinct in the wild, and it is not thought it will be possible to reintroduce them to their former environments, as Cycads are usually co-dependent on single species of pollinators, typically Weevils, with neither species able to survive in the absence of the other.

In addition to other problems, many Cycad populations are known to suffer from inbreeding depression, a phenomenon which occurs when much of a natural population has been wiped out and most of the surviving members are closely related. Inbreeding depression can lead to health problems as harmful recessive genes become widespread, and typically leads in reduced fertility. In extreme cases this can result in populations with numerous living individuals, which can be observed and recorded by naturalists, but which have no prospect of long-term survival.

In a paper published on the International Journal of Plant Sciences in January 2015, a team of scientists led by Patrick Griffith of the Montgomery Botanical Center in Florida discuss the results of a genetic study of the Sinkhole Cycad, Zamia decumbens, both in the wild and at the Montgomery Botanical Center, where a population of Sinkhole Cycads has been established from wild collected seeds, in order to determine how the Florida population reflects the genetic diversity of the wild population.

Specimens of the Sinkhole Cycad, Zamia decumbens, growing wild in southern Belize. Griffith et al. (2015).

The Sinkhole Cycad was first described in 2009, and has two main wild populations comprising 234 and 183 plants in two limestone sinkholes separated by 7 km in the Maya Mountains in southern Belize, plus a few scattered populations on hilltops in the same area, comprising no more than twelve individuals each. In addition there are 205 plants at the Montgomery Botanical Center, raised from seeds collected at both sinkhole localities. The Sinkhole Cycad is considered to be Critically Endangered under the terms of the International Union for the Conservation of Nature’s Red List of Threatened Species.

The small size of the wild populations meant that it was possible to genetically sample all of the wild plants in the two sinkhole populations, as well as all of the plants at the Montgomery Botanical Center. The plants were analysed for the total number of alleles present in each population (an allele is a gene at a locus where more than one variant can occur, for example humans have a single locus for eye colour, with blue, brown and green eyes being produced by different alleles), in prder to determine the genetic variation within each population, and determine how that of the Montgomery population reflected total variation in the wild population.

The Montgomery population was found to include 77.6% of the total wild genetic variation, including 70.0% of the genetic variation at the first sinkhole and 73.6% of the variation at the second. This is a little disappointing, as similar studies on wild and captive Palms have found a much higher proportion of alleles in smaller captive populations, although it is not altogether unexpected given the biology of Cycads, as not all male plants produce pollen every year, so that seeds collected from different female plants in a small population are more likely to share the same father. It also suggests that the two wild sinkhole populations are genetically distinct, and that plants collected from the two sites should be curated separately.

Based upon this study, Griffith et al. make four recommendations for future projects in which ex situ populations of Cycads (or other plants) are being established to act as a genetic reserve for wild populations. Firstly the collecting strategy should reflect the known biology of the plants. Secondly where plants are collected from more than one population, these plants should be curated separately. Thirdly multiple accessions (collections of seeds from separate mother plants) should be collected and maintained. Finally seeds should be collected on multiple years.

See also…

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