scholarly journals The endemic land snail Gulella taitensis of the Taita Hills forests, Kenya: on the brink of extinction

Oryx ◽  
2006 ◽  
Vol 40 (3) ◽  
pp. 362-364 ◽  
Author(s):  
Charles N. Lange
Keyword(s):  
Population Size ◽  
Conservation Status ◽  
Legal Protection ◽  
Land Snail ◽  
Iucn Red List ◽  
Small Population ◽  
Red List ◽  
Forest Fragments ◽  
Forest Reserves ◽  
Taita Hills

This paper describes the distribution, population size and conservation needs of the land snail Gulella taitensis (Gastropoda: Streptaxidae) endemic to the Taita Hills, Kenya. The species was investigated using timed searches between July and December 2000. In total 37 snails were recorded from only five of nine forest fragments searched. The snail was generally more abundant in the smaller forest fragments. The species appears to be a forest specialist, exhibiting preference for the least disturbed sections of forest. The small population size, restricted distribution and concentration in the smallest and most fragile forest fragments suggests the species is on the brink of extinction. The species fulfills the requirements for changing its conservation status from Endangered to Critically Endangered on the IUCN Red List. Promotion of the Forest Reserves to a conservation category that provides greater legal protection is necessary.

scholarly journals Species conservation profile and amended distribution of Cousinia knorringiae (Asteraceae), a narrow endemic of the Western Tian-Shan

2021 ◽  
Vol 9 ◽  
Author(s):  
Mansur Usmonov ◽  
Komiljon Tojibaev ◽  
Chang-Gee Jang ◽  
Alexander Sennikov
Keyword(s):  
Population Size ◽  
Conservation Status ◽  
Line Drawing ◽  
Species Conservation ◽  
Legal Protection ◽  
Iucn Red List ◽  
Small Population ◽  
Iucn Red List Categories ◽  
Difficult Genus ◽  
Tian Shan

Cousinia knorringiae Bornm. (Asteraceae) belongs to C. sect. Subappendiculatae Tscherneva, a group of the species-rich and taxonomically difficult genus Cousinia Cass. This species is narrowly distributed in the Western Tian-Shan and has been known as endemic to Kyrgyzstan. It inhabits bare rocks and screes at elevations of 1200–1500 m above sea level. This species is of conservation interest because of its small population size and limited distribution. Cousinia knorringiae is reported for the first time from eastern Uzbekistan on the basis of specimens collected on Ungur-Tepa Mt., a south-western outlier of the Bozbu-Too Mts. (Western Tian-Shan). The conservation status of the species is assessed as Endangered (EN), based on criterion D (estimated population size 200-250 mature individuals), according to the IUCN Red List Categories and Criteria (version 3.1). A new distribution map and a line drawing for C. knorringiae are provided and its type locality is clarified. The new knowledge suggests that the species is endemic to the East Fergana botanical hotspot, which includes a transborder territory shared between Kyrgyzstan and Uzbekistan and should, therefore, be subjected to international conservation measures. The southern extension of Ungur-Tepa Mt. harbours important plant species, which cannot be found elsewhere in Uzbekistan and may, therefore, be proposed for legal protection.

scholarly journals Giant otter Pteronura brasiliensis density and abundance in Llanos Orientales de Colombia in the Orinoco basin

Oryx ◽  
2020 ◽  
pp. 1-4
Author(s):  
Germán Garrote ◽  
Beyker Castañeda ◽  
Jose Manuel Escobar ◽  
Laura Pérez ◽  
Brayan Marín ◽  
...  
Keyword(s):  
South America ◽  
Population Size ◽  
20Th Century ◽  
Conservation Status ◽  
Species Conservation ◽  
Iucn Red List ◽  
Red List ◽  
Recreational Fishing ◽  
Pteronura Brasiliensis ◽  
Direct Counts

Abstract The giant otter Pteronura brasiliensis, categorized as Endangered on the IUCN Red List, was once widely distributed throughout South America. By the middle of the 20th century the giant otter had become locally extinct along the main rivers of the Orinoco basin. Although some populations seem to have recovered, the paucity of information available does not permit a full evaluation of the species' conservation status. The objective of this study was to estimate the abundance and density of the giant otter population along the Orinoco river in the municipality of Puerto Carreño, Vichada, Colombia, where there is important commercial and recreational fishing. Thirty-nine linear km were surveyed, repeatedly, with a total of 315 km of surveys. Population size was estimated by direct counts of individuals. All individuals detected were photographed and identified individually from their throat pelage patterns. In total, 30 otters were identified, giving a minimum density of 0.77 individuals per km, one of the highest reported for the species in Colombia. Given the high density in this well-developed area, our results highlight the importance of this population for the conservation of the species.

scholarly journals Distribution and status of the Critically Endangered blond titi monkey Callicebus barbarabrownae of north-east Brazil

Oryx ◽  
2011 ◽  
Vol 45 (3) ◽  
pp. 439-443 ◽  
Author(s):  
Rodrigo C. Printes ◽  
Anthony B. Rylands ◽  
Júlio César Bicca-Marques
Keyword(s):  
Conservation Status ◽  
Iucn Red List ◽  
Red List ◽  
Critically Endangered ◽  
Forest Fragments ◽  
Vegetation Types ◽  
North East ◽  
Area Of Occupancy ◽  
Titi Monkey ◽  
Iucn Red List Assessment

AbstractThe blond titi monkey Callicebus barbarabrownae lives in forest fragments in the caatinga (tropical thorn scrub and forest) of north-east Brazil. In 2004–2005 we carried out five surveys to determine its current distribution and conservation status; surveying forest fragments, interviewing local people, and recording vegetation types and patterns of land use. The blond titi monkey occurs mainly in Dense Arboreal Caatinga and Highland Coastal Rainforest in the state of Bahia, at elevations of 241–908 m. Its range extends over 291,438 km2, with an area of occupancy of 2,636 km2. Estimated minimum population was 260 individuals. It was not recorded in any protected area. Cattle ranching favours the persistence of forest fragments for this species, whereas agriculture, subsistence or commercial, does not. Our findings supported the IUCN Red List assessment of Critically Endangered for this species.

scholarly journals Conservation status of Mascarene Amaranth Aerva congesta Balf.F. Ex Baker (Eudicots: Caryophyllales: Amaranthaceae): a Critically Endangered endemic herb of the Mascarenes, Indian Ocean

2018 ◽  
Vol 10 (8) ◽  
pp. 12056
Author(s):  
Kersley Bruno Pynee ◽  
David Harold Lorence ◽  
Poojanraj Khurun
Keyword(s):  
Conservation Status ◽  
Iucn Red List ◽  
Small Population ◽  
Red List ◽  
Critically Endangered ◽  
Native Vegetation ◽  
Ecological Studies ◽  
Area Of Occupancy ◽  
Mascarene Islands ◽  
Iucn Red List Criteria

Aerva congesta Balf.f. ex Baker (Amaranthaceae), an endemic of Mascarene Islands (Mauritius and Rodrigues) is assessed for its conservation status. Considering its local extinction in Rodrigues and very small population in Mauritius, in Round Island and at Gris Gris, south of Mauritius its area of occupancy (AOO) is estimated at 8km².  Due to its small AOO and threats by increasing native vegetation and alien species, A. congesta is evaluated as Critically Endangered following the latest IUCN Red List criteria.  The species needs an urgent well-defined restoration program and ecological studies to prevent its extinction.  

scholarly journals Conservation status and recovery of Podocarpus angustifolius: a threatened tree of Cuba

Oryx ◽  
2021 ◽  
pp. 1-3
Author(s):  
Ernesto Testé ◽  
Majela Hernández ◽  
Eldis R. Bécquer ◽  
Oliver Valle ◽  
Luis R. González-Torres
Keyword(s):  
Protected Areas ◽  
Size Structure ◽  
Conservation Status ◽  
Population Based ◽  
Iucn Red List ◽  
Small Population ◽  
Red List ◽  
Coffee Plantations ◽  
Area Of Occupancy ◽  
In The Wild

Abstract The recovery of species’ populations is one of the most challenging tasks in conservation, which is why species recovery is most likely to be successful if it involves as many stakeholders as possible. Podocarpus angustifolius, a tree endemic to Cuba, is potentially threatened by overexploitation, deforestation and expansion of exotic species. In December of 2017, in two protected areas containing the only known subpopulations of this species, we recorded the geographical position, height, and diameter at breast height of each individual, and calculated the extent of occurrence (EOO) and area of occupancy (AOO). We recorded a total of 575 individuals, 174 of which were adult (defined as ≥ 6 m height on the basis of the occurrence of reproductive structures), and most of which occurred in Lomas de Banao Ecological Reserve. The EOO and AOO were 125.8 km2 and 6.0 km2, respectively. All P. angustifolius that remain in the wild are within two protected areas, either in rainforest relicts or in coffee plantations. The size structure indicates a growing population. Based on our findings we recommend that P. angustifolius should be recategorized from Vulnerable (on the IUCN Red List) and Critically Endangered (on the national Red List) to Endangered, based on criterion D (small population size). We recommend the continued reinforcement of the population at Topes de Collantes Natural Protected Landscape and the continued engagement of local stakeholders for the long-term conservation of this species.

scholarly journals An assessment of the distribution and conservation status of hornbill species in Thailand

Oryx ◽  
2013 ◽  
Vol 47 (3) ◽  
pp. 441-450 ◽  
Author(s):  
Yongyut Trisurat ◽  
Vijak Chimchome ◽  
Anak Pattanavibool ◽  
Sitthichai Jinamoy ◽  
Siriporn Thongaree ◽  
...  
Keyword(s):  
Protected Area ◽  
Patch Size ◽  
Conservation Management ◽  
Conservation Status ◽  
Iucn Red List ◽  
Small Population ◽  
Red List ◽  
Land Area ◽  
Field Surveys ◽  
Maximum Entropy Modelling

AbstractMany hornbill species in Thailand are categorized as Endangered or Critically Endangered on the IUCN Red List. The objectives of this research were to predict hornbill distributions in Thailand and to assess the national conservation status of the species using extent of occurrence. We employed maximum entropy modelling, using 10 environmental variables that were believed to directly or indirectly influence hornbill distributions across Thailand, to predict the habitats potentially suitable for 10 of the country's 13 hornbill species. Data on the presence of hornbills were gathered from the Thailand Hornbill Project and additional field surveys in protected area complexes during 2004–2006. The results indicated that patch size is the most important factor affecting distribution, followed by latitude, ecoregion and distance to villages. All hornbill species were predicted to occur primarily in intact protected area complexes. The total extent of all hornbill habitats covers 9.3% of the country's land area. Seven of the 10 modelled species are at risk and the current distribution pattern is expected to reflect stochastic extinctions because of small population size. We recommend that the conservation status of Austen's brown hornbill Anorrhinus austeni and Tickell's brown hornbill Anorrhinus tickelli should be changed from Vulnerable to Endangered. The model identified five protected area complexes as hornbill hotspots in Thailand. These findings will help guide conservation management.

A downlist is not a demotion: Red List status and reality

Oryx ◽  
2017 ◽  
Vol 51 (4) ◽  
pp. 605-609 ◽  
Author(s):  
David P. Mallon ◽  
Rodney M. Jackson
Keyword(s):  
Population Size ◽  
Giant Panda ◽  
Total Population ◽  
Extinction Risk ◽  
Conservation Status ◽  
Field Research ◽  
Iucn Red List ◽  
Red List ◽  
Ailuropoda Melanoleuca ◽  
Snow Leopard

AbstractAssessments of biodiversity status are needed to track trends, and the IUCN Red List has become the accepted global standard for documenting the extinction risk of species. Obtaining robust data on population size is an essential component of any assessment of a species’ status, including assessments for the IUCN Red List. Obtaining such estimates is complicated by methodological and logistical issues, which are more pronounced in the case of cryptic species, such as the snow leopardPanthera uncia. Estimates of the total population size of this species have, to date, been based on little more than guesstimates, but a comprehensive summary of recent field research indicates that the conservation status of the snow leopard may be less dire than previously thought. A revised categorization, from Endangered to Vulnerable, on the IUCN Red List was proposed but met some opposition, as did a recent, similar recategorization of the giant pandaAiluropoda melanoleuca. Possible factors motivating such attitudes are discussed. Downlisting on the IUCN Red List indicates that the species concerned is further from extinction, and is always to be welcomed, whether resulting from successful conservation intervention or improved knowledge of status and trends. Celebrating success is important to reinforce the message that conservation works, and to incentivize donors.

scholarly journals Another Seychelles endemic close to extinction: the emballonurid bat Coleura seychellensis

Oryx ◽  
2006 ◽  
Vol 40 (3) ◽  
pp. 310-318 ◽  
Author(s):  
Laura Bambini ◽  
Andrew Blyth ◽  
Tim Bradford ◽  
Rachel Bristol ◽  
Sarah Burthe ◽  
...  
Keyword(s):  
Public Education ◽  
Current Distribution ◽  
Conservation Status ◽  
Legal Protection ◽  
Education Programme ◽  
Iucn Red List ◽  
Red List ◽  
Coastal Habitat ◽  
Dietary Analysis ◽  
Echolocation Calls

The only microchiropteran endemic to the granitic Seychelles, the sheath-tailed bat Coleura seychellensis, is categorized as Critically Endangered on the IUCN Red List. Using bat detectors, the islands of Mahé, Praslin and La Digue were surveyed to establish the current distribution of this species. Although two new roosts were discovered on Mahé, no bats were observed on Praslin and La Digue, and the range of C. seychellensis appears to have further contracted in the last 2 decades. A total of 19 C. seychellensis were counted emerging from or entering three roosts in boulder caves on Mahé during 18 evenings of observations. The bats foraged in open coastal habitat, some of it anthropogenic, and their echolocation calls were also characteristic of bats feeding in open habitat. This study provides no evidence that C. seychellensis is dependent on forest or wetland for foraging. Dietary analysis indicated that C. seychellensis feeds on Coleoptera, Lepidoptera and Diptera. A public education programme to highlight the conservation status of the bat and the consequences of roost disturbance is recommended, together with the urgent need for legal protection of the bats and their roosts.

scholarly journals Begonia shenzhenensis, a new species of Begoniaceae from Guangdong of China

2021 ◽  
Author(s):  
Dai-Ke Tian ◽  
Bin Chen ◽  
Yan Xiao ◽  
Min-Min Zheng ◽  
Bin-Jie Ge
Keyword(s):  
New Species ◽  
Conservation Status ◽  
Guangdong Province ◽  
Iucn Red List ◽  
Small Population ◽  
Red List ◽  
Leaf Petiole ◽  
Iucn Red List Categories ◽  
Red List Categories ◽  
A New Species

Begonia shenzhenensis D.K.Tian & Xiao-Yun Wang sp. nov., a new species in Begonia sect. Platycentrum of Begoniaceae from Shenzhen of Guangdong province, China, is described. Morphologically, it is mostly similar to Begonia coelocentroides in the same section, but clearly differs by its denser hairs on leaf, petiole and pedicel, abtuse anther apex, hairy ovary and narrower adaxial fruit wing. Based on only one small population ever found so far, its conservation status is assigned to Critical Endangered according to the IUCN Red List Categories and Criteria.

Conservation status of the threatened and endemic Rufous-throated Dipper Cinclus schulzi in Argentina

2019 ◽  
Vol 30 (3) ◽  
pp. 396-405
Author(s):  
NATALIA POLITI ◽  
SEBASTIÁN MARTINUZZI ◽  
PATRICIA SARDINA ARAGÓN ◽  
VERÓNICA MIRANDA ◽  
SEBASTIÁN ALBANESI ◽  
...  
Keyword(s):  
Population Size ◽  
National Parks ◽  
Potential Distribution ◽  
Conservation Status ◽  
Iucn Red List ◽  
Red List ◽  
Mountain Forest ◽  
Suitable Habitat ◽  
Area Of Occupancy ◽  
North Western

SummaryThe Rufous-throated Dipper Cinclus schulzi is endemic to the Southern Yungas of north-western Argentina and southern Bolivia. The species is categorised as ‘Vulnerable’ on the IUCN Red List on the basis of small population size and restricted range. The purpose of our study was to determine the distribution of potentially suitable habitat for the Rufous-throated Dipper, estimate its population size, and assess potential distribution within strict protected areas, in north-western Argentina. We surveyed 44 rivers in the Southern Yungas of Argentina from 2010 to 2013 to determine dipper density (i.e. the number of individuals detected per km surveyed). The dipper’s potential distribution was assessed using a maximum entropy modeling approach based on 31 occurrence points and eight bioclimatic and two topographic variables as predictors. The species is dependent on mountain forest rivers, so the potential distribution was restricted to rivers. We estimated dipper population size by multiplying density by the potential distribution along rivers. Finally, we calculated the extent of suitable habitat contained within the boundaries of Argentina´s National Parks. Dipper density was 0.94 ± 1.55 individuals/km. We estimate that within north-west Argentina there are ~2,815 km of river that are potential habitat, with an area of occupancy of 141 km2 and a population size of 2,657 ± 4,355 dippers. However, of this river extent, less than 5% is within National Parks. Our results highlight the need to create new and to enlarge existing National Parks that protect the potentially suitable habitat of the species. Although more information is needed for Bolivia, the country-level area of occupancy and population size of the dipper found in Argentina provides strong evidence that the IUCN Red List classification of this species as ‘Vulnerable’ is warranted.

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