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.

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 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 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 Conservation status of the unique population of Wenchengia alternifolia, an enigmatic plant endemic to Hainan Island, China

Oryx ◽  
2014 ◽  
Vol 48 (3) ◽  
pp. 354-357 ◽  
Author(s):  
Bo Li ◽  
Zhiyong Zhang ◽  
Dianxiang Zhang
Keyword(s):  
Plant Species ◽  
Ex Situ Conservation ◽  
Conservation Status ◽  
Hainan Island ◽  
Iucn Red List ◽  
Red List ◽  
Critically Endangered ◽  
Ex Situ ◽  
Field Surveys ◽  
Remnant Population

AbstractWenchengia alternifolia (Lamiaceae) is a plant species endemic to Hainan Island, China. Since the 1930s it was known from only four collections and was believed to be extinct until a remnant population was rediscovered in 2010. We conducted further field surveys during 2010–2012 but located only one population, with 66 individuals. W. alternifolia is restricted to the c. 1,500 m2 Shuangximu Valley, in a harsh microenvironment surrounded by plantations. As the population comprises < 50 mature individuals, we propose that W. alternifolia be categorized as Critically Endangered on the IUCN Red List, based on criterion D. We recommend that the remnant population and its habitat need urgent protection and monitoring and that ex situ conservation, for future reintroduction, should be implemented.

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.

scholarly journals Ecology and Conservation of the Laotian langur Trachypithecus laotum in a Protected Area of Laos (Southeast Asia)

Diversity ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 231
Author(s):  
Johnny Souwideth ◽  
Phaivanh Phiapalath ◽  
Hai Dong Thanh ◽  
Peter Brakels ◽  
Thong Pham Van ◽  
...  
Keyword(s):  
Protected Area ◽  
Democratic Republic ◽  
Conservation Status ◽  
Niche Partitioning ◽  
Lao Pdr ◽  
Iucn Red List ◽  
Primate Species ◽  
Field Surveys ◽  
Competition For Food ◽  
High Threat

Terrestrial species from the Lao People’s Democratic Republic (PDR) are under high threat due to deforestation and overhunting. Previous studies have even defined these forests as subjected to an “empty forest syndrome”, a condition in which forests that are apparently well preserved are instead almost deprived of vertebrate faunas due to extreme exploitation by local communities. Forest specialists, including several primates, are among the most threatened species in the country. The Laotian langur (Trachypithecus laotum) is endemic to Lao PDR, is listed as Endangered by the IUCN Red List, and it is one of the least studied species in the region. A survey on the local distribution, life history and conservation status of the Laotian langur was carried out in Phou Hin Poun National Protected Area, Khammouane Province of Lao PDR. The survey consisted of an initial phase with interviews to select key informants on the Laotian langur and the other primate species of the area. Then, a phase of field surveys along forest transects, totaling 64.1 km of 21 transects, yielded a record of 35 individuals in 9 groups. The highest encounter/detection rate of the Laotian langur was 1 group per km at one sector of the park. In contrast, it was much lower (0.18–0.34 groups/km) in the rest of the protected area. The group sizes were much lower than those observed in the same area between 1994 and 2010, thus suggesting a decline in the population size of langurs. This decline may be linked to habitat loss (timber extraction and mining). Still, also overhunting, as signs of poaching were observed during our field surveys. This was also supported by the reports of our interviewees. Laotian langurs were observed to be sympatric and interact while foraging with the Assamese macaque (Macaca assamensis). In the cases of sympatric occurrence between the two species, we observed that subtle mechanisms of niche partitioning may occur to reduce interspecific competition for food. Further research on the population and ecology of this endangered langur should be conducted to understand the species and aid its conservation.

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

PhytoKeys ◽  
2021 ◽  
Vol 178 ◽  
pp. 171-177
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 &amp; X.Yun Wang, sp. nov., a new species in Begonia sect. Platycentrum of Begoniaceae from Shenzhen of Guangdong province, China, is described and illustrated. Morphologically, it is primarily similar to B. coelocentroides in the same section but 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 found to date, its conservation status is assigned to Critical Endangered according to the IUCN Red List Categories and Criteria.

scholarly journals Conservation of endemic insular plants: the genus Ribes L. (Grossulariaceae) in Sardinia

Oryx ◽  
2011 ◽  
Vol 46 (2) ◽  
pp. 219-222 ◽  
Author(s):  
Giuseppe Fenu ◽  
Efisio Mattana ◽  
Gianluigi Bacchetta
Keyword(s):  
Field Survey ◽  
Conservation Status ◽  
Seed Viability ◽  
Iucn Red List ◽  
Small Population ◽  
Red List ◽  
Critically Endangered ◽  
Research Activities ◽  
Conservation Actions ◽  
Endangered Status

AbstractOnly two members of the genus Ribes L. (Grossulariaceae) occur in Sardinia, both endemic: R. sardoum and R. multiflorum subsp. sandalioticum. R. sardoum is categorized as Critically Endangered on the IUCN Red List and R. multiflorum subsp. sandalioticum is a rare species previously known from only a few localities. Both species grow only in mountainous areas. In 2006–2010 we carried out a field survey to verify the conservation status of R. sardoum and to estimate the number of individual plants, identify threats and assess the conservation status of R. multiflorum subsp. sandalioticum. R. sardoum is threatened by grazing, its small population, low seed viability and the activities of tourists, confirming its Critically Endangered status. We found R. multiflorum subsp. sandalioticum in 13 localities, three of which are new records, with the plants in scattered groups or singly, in three populations. The threats to R. multiflorum subsp. sandalioticum are overgrazing, the small populations, habitat fragmentation and the activities of tourists. We propose that R. multiflorum subsp. sandalioticum be categorized as Endangered on the IUCN Red List. Research activities and conservation measures for this genus on Sardinia have been proposed and some conservation actions have already commenced.

scholarly journals Decline of the Tibetan gazelle Procapra picticaudata in Ladakh, India

Oryx ◽  
2006 ◽  
Vol 40 (2) ◽  
pp. 229-232 ◽  
Author(s):  
Yash Veer Bhatnagar ◽  
Rinchen Wangchuk ◽  
Charudutt Mishra
Keyword(s):  
Tibetan Plateau ◽  
Conservation Management ◽  
Conservation Status ◽  
Iucn Red List ◽  
Red List ◽  
Livestock Grazing ◽  
The Tibetan Plateau ◽  
The Past ◽  
Northern India ◽  
Participatory Conservation

The Tibetan gazelle Procapra picticaudata is endemic to the Tibetan plateau. In the Ladakh region of northern India its range declined from c. 20,000 km2 in the early 1900s to c. 1,000 km2 in the late 1980s. Here we report the results of our recent (1999–2003) assessments of the gazelle's conservation status in Ladakh. Range-wide surveys indicate that the present population of the Tibetan gazelle in Ladakh is c. 50, restricted to a range of c. 100 km2. Populations in the Tso Kar basin and Dungti have gone extinct within the past decade. Throughout the last century hunting was the primary cause of the gazelle's decline. Although hunting has been brought under control in the last two decades, intensified livestock grazing appears to have prevented the gazelle's recovery and may be precipitating further declines. The species needs immediate, participatory conservation management, as well as a reassessment of its IUCN Red List status.

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.

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