Endangered Species Friday: Gastropholis prasina.
Endangered Species Friday: Gastropholis prasina
In this Fridays Endangered Species Watch Post (ESP), I focus briefly on this rather elusive species of Green Keel bellied Lizard, that’s endemic to the continent of Africa. I’ve long adored our African reptilians, unfortunately they’re own habitat like many larger species of fauna is under threat… (Image credited: S. Spawls) Green Keel bellied Lizard.
Listed as (near threatened) the species was primarily identified by Dr Franz Werner (15 August 1867 in Vienna - 28 February 1939 in Vienna) was an Austrian zoologist and explorer. Specializing as a herpetologist and entomologist, Werner described numerous species and other taxa of frogs, snakes, insects, and other organisms.
I thank Dr Werner (despite not being alive today), for his truly amazing journeys all over the African continent of which he located many hundreds of different reptiles, snakes, frogs, worms, and an assortment of other mammals. Had Dr Werner not followed on from his fathers footsteps its quite likely the Green Keel bellied Lizard wouldn’t be known today (among many other animals this amazing man identified).
Gastropholis prasina was originally identified back in 1904, then re-classified by Dr Loverbridge back in 1936 as (Bedriagaia moreaui ). However today this is not the species true name, G. prasina remains the true identity. Endemic to Kenya and Tanzania, the species is commonly known found along the eastern arc of Kenya and Tanzania’s coastal plain.
Localities are: Watamu, Arabuko-Sokoke Forest, Amani in the Usambara Mountains, Tanga, Zaraninge Forest, and the Nguru Mountains. The reptilian probably also occurs in Kenya’s Shimba Hills, however this has yet to be fully confirmed.
Populations are known to be “severely fragmented”, which has led to concerns that the species may soon be re-listed as (vulnerable or even endangered). Current historical data records show no evidence of a mean population count sparking more concerns that the species may be more “threatened than has been led to believe”. For now we can only assume (but not estimate) what the population count may be based on location and trapping (see image below). (updates to follow). Please view the map below of which details where the highest abundance of Green Keel bellied Lizard habitats remain today.
Image: Identified habitat locations of the Green Keel bellied Lizard.
Past records state the species is either “rare or considered very rare”, however I must point out that this historical data is from 1989 and a further assessment dated 2002. Vast swathes of habitat has been lost since the 1980’s and early millennium, habitat destruction is rife within Kenya and Tanzania, poaching, bush meat trade and land conversions are also increasing annually.. So in all honesty, none knows for sure if the species is now (to date rare or very rare), as records are out of date, which is an observational fact!
Unfortunately the species is neither listed on (Cites appendix I or II) despite the fact the reptilian is near (vulnerable). There remains no evidence that the Green Keel bellied Lizard is used within trade, or the Traditional African Medicine Trade (TAM). However there is evidence that the reptilian is collected during large scale tree felling for displays in local snake farms. Its quite possible the species “may be collected to feed snakes too” which if true could be seriously detrimental to the wild populations that are still unknown.
Image credit: Torsten Kunsch
Green Keel bellied Lizard is diurnal (either comes out during the day or not). The reptilian is also known to be quite secretive and arboreal (living mostly in or among trees), which could explain why the reptilian is at the best of times difficult to locate and study, especially if the animal wants to come out only at night. Environmental scientists are in a sense playing cat and mouse when it comes to studying that is.
Despite the species living primarily among trees, there is no evidence that the animal lives high up among the canopies either, (confusing I know). Specimens have been located mainly close to the ground or next to the base of trees, as seen within the images above (1-2). Further studies have shown that the reptilian can live as high as 12 meters from base level within the tree, but not exactly the canopy.
Investigations haven’t really shed much light as to whether the species is indeed affected by habitat disturbance. However where cashew nut farms are being grown within the animals habitat of which these farms have turfed up the animals natural homes, there does appear to be some evidence that proves the Green Keel bellied lizard cannot tolerate this type of habitat disturbance, so we’ll need to be looking into this more closely, followed up with surveys in relation to intensive logging and species collection.
While the Green Keel bellied Lizard is not listed on either of the appendixes, the reptilian is known to inhabited ‘protected parks’ being that of Arabuko-Sokoke Forest and the Amani and Zaraninge Forest.
Major Threats
Coastal forest is rapidly disappearing within this species’ range, and is thought likely to represent a threat to the lizard. While it has been recorded from cashew plantations, it is thought to require continuous tree cover. Expanding human populations along the fertile East African coast, and associated agricultural development, are the major threats to forest in this region (2014). Much of the species’ coastal distribution is, however, within well-protected areas, and its largest distribution centre is inland in the Nguru Mountains.
It’s uncertain what the future holds for this rather secretive lizard, furthermore its evident that threats while minimal are still present and increasing, we still don’t know what the actual true population count is neither. More studies need to be conducted to determine the exact population, and where required the necessary protection plans and (listing on either Appendix I or II) applied.
Video: Green Keel bellied Lizard in Captivity
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Dr Jose C. Depre PhD. MEnvSc. BSc(Hons) Botany, PhD(NeuroSci) D.V.M.
Environmental, Botanical & Human Science
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Endangered Species Friday: Diomedea amsterdamensis - An Ocean of Grief.
Endangered Species Friday: Diomedea amsterdamensis
This Friday’s (ESP) Endangered Species watch Post I dedicate to one of the most stunning and adorable of all plane like birds. Listed as [critically endangered] and identified back in 1983 by South African Dr Jean Paul Roux whom is a Marine Biologist studying Zoology, Systems Biology and Marine Biology at the University of Cape Town, South Africa Jean Paul Roux works full-time at the Department of Biological Sciences, Cape Town. (Image D. amsterdamensis fledglings)
(Image: Birdingblogs.com)
Commonly identified as the Amsterdam Albatross or Amsterdam Island Albatross the species was listed as [critically endangered] back in 2012. This gorgeous bird is endemic to the French Southern Territories of which its populations are continuing to decline at a rapid pace. Populations were estimated at a mere 170 individuals which in turn ranks as the worlds most endangered species of bird. Out of the 170 individuals there are a total of 80 mature individuals consisting of 26 pairs that breed annually.
Between 2001-2007 there were a total of 24-31 breeding pairs annually, which leaves a slightly lower population count today of around 100 mature individuals. Back in 1998 scientists stated that there were no fewer than 50 mature individuals if that. The Amsterdam Albatross doesn’t naturally have a small population however qualified for the category of [critically endangered] due to this reason when identified in 1983. Furthermore pollution, habitat destruction and disease remain pivotal factors that’s decreasing populations furthermore. The video below from MidWay island explains a little more about pollution and birds of this caliber.
Its quite possible that there could be more unidentified groups within the local territory or elsewhere, unfortunately as yet there is no evidence to suggest the Amsterdam Albatross is located anywhere else, however there have been sightings, which do not necessarily count as the species being endemic to countries the bird may have been noted within.
The species breeds on the Plateau des Tourbières on Amsterdam Island (French Southern Territories) in the southern Indian Ocean. An increase of populations was documented via census back in 1984, a year after identification. Marine Biologists have stated that population sizes may have been more larger when its range was more extensive over the slopes of the island.
Meanwhile in South Africa satellite tracking data has indicated the Amsterdam Albatross ranges off the coast of Eastern South Africa to the South of Western Australia in non-breeding pairs. There have been some [possible] sightings over Australia through to New Zealand too. Meanwhile South Africa “may” have its first breeding pair this must not be taken as factual though. Back in 2013 a nature photographer photographed an Amsterdam Albatross off the Western Cape of South Africa which is the very first documented and confirmed sighting [2013].
AN OCEAN OF GRIEF
Breeding is biennial (when successful) and is restricted to the central plateau of the island at 500-600 m, where only one breeding group is known. Pair-bonds are lifelong, and breeding begins in February. Most eggs are laid from late February to March, and chicks fledge in January to February the following year.
Immature birds begin to return to breeding colonies between four and seven years after fledging but do not begin to breed until they are nine years of age. The Amsterdam Albatross exact diet is unknown, but probably consists of fish, squid and crustaceans. During the breeding season, birds forage both around Amsterdam Island and up to 2,200 km away in subtropical waters which is something of interest. During the great Sardine Run many aquatic species consisting of birds, seals, sharks and whales hit the South African oceans hard for sardines. So I am calling on my fellow South African friends to please be on the lookout for this rather elusive bird.
Read more here on the Avian Biology.
Image: Amsterdam Albatross mating ritual, credited to Andrew Rouse.
Diomedea amsterdamensis, is quite a large albatross. When described in 1983, the species was thought by some researchers to be a sub-species of the wandering albatross, D. exulans. Bird Life International and the IOC recognize it as a species, James Clements does not, and the SACC has a proposal on the table to split the species. Please refer to the link above on Avian Biology which will explain more on the bird and its current classification.
More recently, mitchondrial DNA comparisons between the Amsterdam albatross, the wandering albatross Diomedea exulans, the Antipodean albatross D. antipodensis and the Tristan albatross D. dabbenena, provide clear genetic evidence that the Amsterdam albatross is a separate species.
Threats
Degradation of breeding sites by introduced cattle has decreased the species’s range and population across the island. Human disturbance is presumably also to blame. Introduced predators are a major threat, particularly feral cats. Interactions with longline fisheries around the island in the 1970s and early 1980s could also have contributed to a decline in the population.
Today the population is threatened primarily by the potential spread of diseases (avian cholera and Erysipelothrix rhusiopathiae) that affect the Indian Yellow-nosed Albatross Thalassarche carteri population 3 km from the colony. Infection risks are very high and increased chick mortality over recent years suggests the population is already affected.
The foraging range of the species overlaps with longline fishing operations targeting tropical tuna species, so bycatch may also still be a threat, and a recent analysis has suggested that bycatch levels exceeding six individuals per year would be enough to cause a potentially irreversible population decline. Having a distribution on relatively low-lying islands, this species is potentially susceptible to climate change through sea-level rise and shifts in suitable climatic conditions. Plastic pollution has also been noted as problematic.
International Animal Rescue Foundation Africa and International Animal Rescue Foundation France are currently working on projects to reduce more plastic within bird habitat that has never been visited by the organisation before. The current plight of bird habitat and plastic pollution within the Pacific ocean needs to be worked on by everyone, furthermore addressed immediately.
To date all twenty two species within the four genera of Albatross are heavily threatened with extinction. There remains no species at present that is listed as [least concern]. The future is indeed very bleak for all 22 species and something we now need to work on and towards to preserve Albatross’s before extinction occurs within a decade for the vast majority of all twenty two species and sub-species.
Thank you for reading.
Please share to make aware the plight of this stunning bird and the remaining twenty two species too.
Dr Jose C. Depre.
Botanical and Environmental Scientist.
A planet without birds is a world not worth living within anymore. Daily I am traumatized and deeply disturbed at viewing the destruction we have caused to these stunning animals and, their natural habitat. I am pained, deeply frustrated and infuriated at international retail companies whom preach good yet practice negligence killing off via plastic pollution our species of birds. Jose Depre
Endangered Species Monday: Afrithelphusa monodosa.
Endangered Species Monday: Afrithelphusa monodosa
Warning: Extinction is now Inevitable
This Mondays (E.S.P) -Endangered Species watch Post I focus on a species of fresh water crab that’s rarely spoken about within the theater of conservation, or animal rights forums. Identified by Mr Bott from which I know little on and about this particular species of marsh crab is currently listed as endangered. Rarely do I document on a species of animal that I and other conservationists know will be extinct within the next five years. My aim for this Monday’s endangered species column is to raise awareness about the plight of this little creature, in a way I hope will force Cites and the Guinea government to now implement emergency evasive action to halt extinction immediately. (Image: Purple Marsh Crab, photographer unknown)
I must also point out that one must not confuse the [common name] of this species [above], identified back in 1959, to that of the United States [Purple Marsh Crab]. Professor Linnaeus created the nomenclature system for a reason, and yet again I am seeing two species of animals that hold the same common names being confused with one-another. Sesarma reticulatum is not under any circumstances related to the Afrithelphusa monodosa pictured above and below.
Endemic to Guinea the species was listed back in 1996 as [critically endangered]. However since the last census was conducted back in [2007] the Purple Marsh Crab has since been submitted into the category of [endangered]. Unfortunately as yet there remains no current documentation on population size, furthermore from the 1996 census, marine conservation reports suggest that no fewer than twenty specimens have been collected from the wild. To date the ‘estimated’ population size stands at a mere 2.500 mature individuals.
Back in 1959 Mr Bott identified the specimen as Globonautes monodosus however from 1999 the species was re-named as Afrithelphusa monodosa. The Purple Marsh Crab is one of only five species in the two genera of which belong to a very rare group of fresh water crabs that are still endemic to the Guinea forests within the block of Western Africa. All five specimens within the two genera are listed as either [endangered or critically endangered], and as such its quite likely that all five specimens will become extinct within the next five to eight years, or possibly even sooner. It is without a doubt that one of the next species on the planet to go extinct will be the Purple Marsh Crab.
Allegedly new specimens have been discovered since [1996] however these reports are somewhat sketchy. When I last documented on the specimen back in 2010 there were no conservation efforts or any projects in the planning process that would help preserve the crabs future survival. We are now in 2015 and I have yet to witness any conservation projects planned or taking place, which I find rather frustrating. As explained the species will be extinct within a matter of years of which the Convention on International Trade of Endangered Species (Cites) should be protecting.
A. monodosa lives within the Guinea swamps and all year round wetland habitat within the northwestern Guinea. The original vegetation cover found at the farmland near the village of Sarabaya where this species was recently collected lies in southern guinea savannah in the semi-deciduous moist forest zone. Specimens of A. monodosus were collected from cultivated land from burrows dug into permanently moist soil each with a shallow pool of water at the bottom. At the end of the dry season after a six-month period without rain the soil in this area nevertheless remains wet year round, so this locality either has an underground water table close to the surface, or a nearby spring. The natural habitat of A. monodosus is still unknown but presumably this cultivated land was originally a permanent freshwater marsh.
There were no nearby sources of surface water and it is clear that these crabs do not need to be immersed in water (as do their relatives that live in streams and rivers), and that A. monodosus can meet its water requirements (such as keeping its respiratory membranes moist and osmoregulation of body fluids) with the small amount of muddy water that collects at the bottom of their burrow. This species is clearly a competent air-breather and has a pair of well-developed pseudol.
Image: Credited to Piotr Naskrecki. Purple Marsh Crab.
Current threats
To be truthfully honest I feel documenting on the current threats is in reality a waste of my time because both the Guinea government and Cites have known of these threats for many years. Yet little if any actions are being taken to suppress these threats. Either way I will document on them in the hope that someone will push for protection or whip into action a protective project sooner rather than later.
To date the species hasn’t been listed on either Cites (I-II) Appendix’s, the major present and future threats to this species include habitat loss/degradation (human induced) due to human population increases, deforestation, and associated increased agriculture in northwest Guinea.
International Animal Rescue Foundation Africa propose the following actions to be undertaken immediately:
- Up to date assessment of population size and location of any new and old habitats documented.
- Surveys to asses diets, predators, diseases and behavior.
- Investigations to locate new subspecies.
- Protection zones established within the highest populated zones.
- Liaising the Guinea government for funding of conservation projects.
- Listing of the species in (I Appendix) Cites.
- Community education and awareness programs.
- Removal of healthy and gene strong species for captive breeding programs.
Crabs Role within the Eco-System
Crabs are one of the major decomposes in the naval environment. In other terms, Crabs help in cleaning up the bottom of the sea and rivers by collecting decaying plant and animal substance. Many fish, birds and sea mammals rely on crabs for a food source. Regardless of if this is one species with low individual populations or not, extinction will only harm other animals. Furthermore will reduce other species food sources. The video below depicts the [Marsh Crabs] and their normal natural environment. The species in question which is identical to the Guinea Purple Marsh Crab is not included within the video but is related to the five genera.
Thank you for reading.
Dr Jose C. Depre
Environmental and Botanical Scientist.
info@international-animalrescue-foundation.org.uk
Endangered Species Monday: Vini peruviana.
Endangered Species Monday: Vini peruviana
This Monday’s endangered species watch post (ESP) I document on a rather elusive bird that is rarely spoken about within the conservation theater or among animal rights organisations. Listed as (vulnerable) the species was formally identified by Professor Philipp Ludwig Statius Müller (April 25, 1725 – January 5, 1776) was a German zoologist. (Image V. peruviana, photographer Tara)
Statius Müller was born in Esens, and was a professor of natural science at Erlangen. Between 1773 and 1776, he published a German translation of Professor Linnaeus’s Natursystem. The supplement in 1776 contained the first scientific classification for a number of species, including the dugong, guanaco, potto, tricolored heron, umbrella cockatoo, red-vented cockatoo, and the enigmatic hoatzin. He was also an entomologist.
Despite the birds high population size the Blue Lorikeet-scientifically named as Vini peruviana is under threat from feral cats, accidental introduction of black rats and violent storms that hit the birds native range frequently causing untold damage and catastrophic destruction to the specie habitat. Furthermore the ‘swamp harrier’ remains an all out threat to Blue Lorikeet’s range which has led to wide range species decline. Swamp Harriers predate on the Blue Parikeet mainly due to the birds color.
Endemic to the Cook Islands and French Polynesia, Blue Lorikeet population sizes are declining quite fast of which drastic conservation measures are now required to control feral cats and the accidental introduction of black rats, not forgetting measures to either reduce swamp harriers or introduce a non-endangered prey for the harrier. The last survey which I believe was undertaken sometime back in 2012 showed a ‘global population’ estimated to be at 7,200 to 9,000 individuals. Which is still quite high, however not high enough to stop the species qualifying for the classification of (endangered).
Taking into consideration range and overall total population size (at an estimate) the species falls into the ‘band’ of 2,500 to 9,000 individuals. This equates (exactly) to 1,677-6,666 ‘mature individuals’ rounded to 1,500-7,000 mature individuals. Summarizing; the exact total population size could be as low as 1,500 but no greater than 7,000 mature individuals (which is extremely concerning).
Blue Lorikeet’s have been recorded within twenty of the south-east Polynesia islands, unfortunately on seven of these islands the species has since been declared officially extinct. The species now remains sparsely distributed on some thirteen islands of which is threatened by rats, feral cats and the swamp harrier. We now know the species is situated within the Society Islands (formerly all), the northern atolls of the Tuamotu Archipelago (both French Polynesia), and Aitutaki (Cook Islands).
Image: Blue Lorikeet - Vini peruviana
Within the Society Islands conservation teams estimated that there were some 200-400 individual pairs on the Motu One and Manuae respectively in 1973 , however this may no longer be the case. On the Maupihaa island back in 1999 conservationists that believed the species to be extinct located breeding pairs. In Tuamotus 2006 surveys have shown the following data in relation to population sizes; Kaukura (1,000), Rangiroa (1,000), Arutua (500), Apataki (200) and Tikehau (50).
Meanwhile in Tiamanu Motu in Apataki atoll a minimum 300 individuals were estimated back in 1989 (this sub-population being allegedly smaller than 10 years previously). On Aitutaki, where it was probably introduced, numbers have been estimated at under 500 pairs, 2,400 individuals and 1,000 individuals (2006).
Following the devastation of Cyclone Pat (2010) a further census was undertaken to asses the impacts of freak weather patterns and catastrophic cyclones on the species. Distance sampling surveys on the island of Aitutaki (2011) showed a decrease in population size of exactly 1,400 individuals. That’s quite a substantial decline of individuals caused directly by a single yet destructive cyclone.
Blue Lorikeets depend on coconut palms for nesting and some of its food, and will frequent cultivated areas. They also roost in palm trees, rising at dawn and calling and preening before feeding. They are usually found in small flocks of less than ten birds. They are active birds, feeding on nectar, insects, and ground forage.
Image: Swamp Harrier (Wiki) - . Circus approximans
Threats
The species’s extinction from many islands is most likely due to predation by black rat Rattus rattus and to a lesser extent, feral cats Felis catus. Blue Lorikeet’s have gone extinct from Makatea in the Tuamotus could have been accelerated by a particularly violent hurricane. Its range reduction in the Society Islands correlates with the spread of the introduced Swamp Harrier Circus approximans. The accidental introduction of black rats to the islands where Blue Loirkeet persists is a continuing threat to the species. Listed on Cites Appendix II conservation actions are under way with more projects proposed.
Thank you for reading.
Dr Jose. C. Depre
Botanical and Environmental Scientist.
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