scholarly journals Range contractions in the Critically Endangered Seychelles terrapins (Pelusios spp.)

Oryx ◽  
2001 ◽  
Vol 35 (4) ◽  
pp. 313-321 ◽  
Author(s):  
J. Gerlach ◽  
L. Canning
Keyword(s):  
Captive Breeding ◽  
Iucn Red List ◽  
Critically Endangered ◽  
Field Surveys ◽  
Iucn Red List Categories ◽  
Captive Breeding Programme ◽  
The Status ◽  
Water Plants ◽  
Wetland Habitats

AbstractThe status of the Seychelles endemic terrapins is reviewed based on field-surveys. Pelusios castanoides intergularis and P. subniger parietalis are confined to a small number of marshes and rivers. All the sites occupied are limited in area (<4.5 ha) and under threat from drainage, predation and invasion by alien water plants. The smallest populations are unlikely to be viable in the long-term. Both species can be categorized as Critically Endangered using the IUCN Red List categories, with highly restricted ranges (2.89 and 6.02 ha for P. castanoides and P. subniger, respectively) that have decreased by over 50 per cent in recent years. Conservation of these species requires both the protection of wetland habitats and the establishment of new populations in protected areas. A captive breeding programme has been established with the aim of reintroducing juveniles into secure reserves. The endemic species P. seychellensis may be extinct.

scholarly journals Czerwona lista porostów wymarłych i zagrożonych w Polsce [Red List of extinct and threatened lichens in Poland]

2014 ◽  
Vol 91 ◽  
pp. 13-49 ◽  
Author(s):  
Stanisław Cieśliński ◽  
Krystyna Czyżewska ◽  
Jerzy Fabiszewski
Keyword(s):  
Lower Risk ◽  
Iucn Red List ◽  
Red List ◽  
Critically Endangered ◽  
Iucn Red List Categories ◽  
Lichen Biota ◽  
The Status ◽  
Red List Categories ◽  
Data Deficient ◽  
Near Threatened

The authors present a list of regionally extinct, threatened, lower risk and insufficiently status taxa of lichens in whole Poland. It is thirth edition of our list. Status of threat to the lichen species used has been determined according to the IUCN Red List Categories in version 3.1 (modified by GlNSBURG 2001). The Red List includes 886 taxa, which constitute 55.4% of the Polish lichen biota. The status of threatened biota has the following categories: Regionally Extinct (RE) - 141 taxa, Critically Endangered (CR) - 179, Endangered (EN) - 201, Vulnerable (VU) - 165, Near Threatened (NT) - 68, Least Concern (LC) - 22 and Data Deficient (DD) 110.

scholarly journals Czerwona lista porostów zagrożonych w polskiej części Sudetów [Red List of threatened lichens in Polish pan of the Sudety Mts.]

2014 ◽  
Vol 91 ◽  
pp. 201-221
Author(s):  
Maria Kossowska
Keyword(s):  
Iucn Red List ◽  
Red List ◽  
Critically Endangered ◽  
Main Frequency ◽  
Iucn Red List Categories ◽  
Threat Status ◽  
The Status ◽  
Red List Categories ◽  
Data Deficient ◽  
Near Threatened

The first regional list of threatened lichens is presented. The list is a result of investigation studies in the Polish part of the Sudety Mts. The status of threat to the lichen species used has been determined according to the IUCN Red List Categories in Version 3.1 (2001). The data obtained were compared with historical ones. Changes of the species main frequency were used as an additional indicator of their threat status. The Red List includes 504 taxa of lichens, which constitute ca 60% of the local biota and 31.6% of Polish biota. The status of threatened biota has the following categories: Regionally Extinct (RE) -123 taxa, Critically Endangered (CR) - 39, Endangered (EN) - 56, Vulnerable (VU) - 84, Near Threatened (NT) - 17, Least Concern (LC) - 19 and Data Deficient (DD) - 166.

How secure is the Lord Howe Island Woodhen? A population viability analysis using VORTEX

1997 ◽  
Vol 3 (2) ◽  
pp. 125 ◽  
Author(s):  
Barry W. Brook ◽  
Leong Lim ◽  
Robert Harden ◽  
Richard Frankham
Keyword(s):  
Captive Breeding ◽  
Population Viability Analysis ◽  
Iucn Red List ◽  
Population Viability ◽  
Viability Analysis ◽  
Wild Pigs ◽  
Lord Howe Island ◽  
Iucn Red List Categories ◽  
Over Exploitation ◽  
Endangered Status

The Lord Howe Island Woodhen is a flightless rail endemic to Lord Howe Island that became endangered due to human over-exploitation and predation from wild pigs. It has recently recovered from a population size of 20?30 to around 200 as a result of a captive breeding and reintroduction programme. Its classification has been downgraded from endangered to vulnerable, but no quantitative assessment of its future prospects had been undertaken. A population viability analysis (PVA) was performed on the Lord Howe Island Woodhen to project its possible fate using VORTEX, a package that realistically reflects the woodhen's recent history. Prospective analyses showed the woodhen to be acutely sensitive to minor changes in mortality and fecundity, and to catastrophes, due to exotic species, inbreeding, or disease. A remote population needs to be established if the likelihood of the woodhen's extinction is to be minimized. According to the most recent IUCN Red List categories, the woodhen satisfies the criteria for endangered status.

scholarly journals Conservation Status of Brachycephalus Toadlets (Anura: Brachycephalidae) from the Brazilian Atlantic Rainforest

Diversity ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 150
Author(s):  
Marcos R. Bornschein ◽  
Marcio R. Pie ◽  
Larissa Teixeira
Keyword(s):  
Conservation Status ◽  
Iucn Red List ◽  
Critically Endangered ◽  
Atlantic Rainforest ◽  
Minimum Convex Polygon ◽  
Iucn Red List Categories ◽  
Data Deficient ◽  
Polygon Method ◽  
Official Recognition ◽  
Brazilian Atlantic Rainforest

The number of described anurans has increased continuously, with many newly described species determined to be at risk. Most of these new species inhabit hotspots and are under threat of habitat loss, such as Brachycephalus, a genus of small toadlets that inhabits the litter of the Brazilian Atlantic Rainforest. Of 36 known species, 22 were described in the last decade, but only 11 have been assessed according to the IUCN Red List categories, with just one currently listed as Critically Endangered. All available data on occurrence, distribution, density, and threats to Brachycephalus were reviewed. The species extent of occurrence was estimated using the Minimum Convex Polygon method for species with three or more records and by delimiting continuous areas within the altitudinal range of species with up to two records. These data were integrated to assess the conservation status according to the IUCN criteria. Six species have been evaluated as Critically Endangered, five as Endangered, 10 as Vulnerable, five as Least Concern, and 10 as Data Deficient. Deforestation was the most common threat to imperiled Brachycephalus species. The official recognition of these categories might be more readily adopted if the microendemic nature of their geographical distribution is taken into account.

Combining local knowledge and field surveys to determine status and threats to Timneh Parrots Psittacus timneh in Guinea-Bissau

2018 ◽  
Vol 29 (03) ◽  
pp. 400-412
Author(s):  
DANIEL C. LOPES ◽  
ROWAN O. MARTIN ◽  
MOHAMED HENRIQUES ◽  
HAMILTON MONTEIRO ◽  
PAULO CARDOSO ◽  
...  
Keyword(s):  
Local Community ◽  
Iucn Red List ◽  
Habitat Modification ◽  
Population Declines ◽  
Community Members ◽  
Pet Trade ◽  
Field Surveys ◽  
Guinea Bissau ◽  
The Status ◽  
Line Transects

SummaryTimneh Parrots Psittacus timneh are a threatened species endemic to the moist forests of West Africa. In 2016, they were categorised as ‘Endangered’ on the IUCN Red List, due to suspected rapid population declines driven by habitat loss and heavy trapping for the pet trade. Systematic assessments of the status of populations are lacking for much of their range and addressing this knowledge shortfall has been identified as a priority action. We combined multiple research approaches to investigate the distribution, trends and threats to Timneh Parrots in Guinea Bissau, where the species is restricted to the islands of the Bijagós archipelago and Pecixe. Direct observational surveys were conducted along line transects on 19 islands. A total of 69 groups were observed on eight of these islands, with the majority (78%) seen on just two islands. Forty-two interviews were conducted with local community members on 24 islands. Interviewees reported the species to occur on 20 islands and that populations are generally perceived to have declined in recent decades. Based on these findings and existing data we conclude that Timneh Parrots occur on 22 of the 32 islands considered and estimate the national population in Guinea-Bissau to be in the order of several hundred individuals, with perhaps half of the parrots occurring on the islands of João Vieira and Meio. Investigations into the factors linked to inter-island variation in parrot densities indicate that densities are highest on the islands which are most remote from permanent human settlements. These findings suggest that human activities including habitat modification and trapping have been important in driving population declines in Guinea-Bissau. We consider the implications of these findings for the conservation of Timneh Parrots.

Habitat suitability index model for the eastern barred bandicoot, Perameles gunnii

1996 ◽  
Vol 23 (2) ◽  
pp. 221 ◽  
Author(s):  
RP Reading ◽  
TW Clark ◽  
JH Seebeck ◽  
J Pearce
Keyword(s):  
Habitat Suitability ◽  
Habitat Structure ◽  
Captive Breeding ◽  
Simple Relationship ◽  
Habitat Suitability Model ◽  
Index Model ◽  
Suitability Index ◽  
Captive Breeding Programme ◽  
Security Values

The eastern barred bandicoot, Perameles gunnii, is functionally extinct on mainland Australia. Conservation of this unique taxon is dependent on reintroduction, based on a managed captive-breeding programme that provides founder animals. Existing reserves at which reintroduction has occurred are too small to support long-term genetically viable populations. Therefore, reintroductions must be made at a number of sites and the resulting populations managed as a metapopulation. A habitat-suitability model has been developed to assess and compare reintroduction sites. This is the first application of this concept to an Australian species. The model is composed of five variables-size, habitat structure, predation, shape and security-values of which are combined in a simple relationship to produce comparable mathematical statements for proposed reintroduction sites. The model has been applied to existing reserves to test their contribution to the recovery programme.

scholarly journals The decline of the endemic Fijian crested iguana Brachylophus vitiensis in the Yasawa and Mamanuca archipelagos, western Fiji

Oryx ◽  
2007 ◽  
Vol 41 (1) ◽  
pp. 44-50 ◽  
Author(s):  
Peter S. Harlow ◽  
Martin Fisher ◽  
Marika Tuiwawa ◽  
Pita N. Biciloa ◽  
Jorge M. Palmeirim ◽  
...  
Keyword(s):  
Habitat Loss ◽  
Forest Fires ◽  
Population Decline ◽  
Forest Degradation ◽  
Iucn Red List ◽  
Red List ◽  
Critically Endangered ◽  
Introduced Predators ◽  
Free Ranging

The endemic Fijian crested iguana Brachylophus vitiensis, categorized as Critically Endangered on the IUCN Red List, has been recorded from several islands in western Fiji. We conducted a survey for the crested iguana on 12 uninhabited and five inhabited islands in the Yasawa and Mamanuca archipelagos of western Fiji in September 2000. Night searches for sleeping iguanas along a total of 11.2 km of forest transects suggest that crested iguanas are either extremely rare or extinct on all of these islands. Although we collectively searched a total of 44 km of transect over 123 person hours, we located crested iguanas on only four islands: three small uninhabited islands (all <73 ha) and one large inhabited island (22 km). In July 2003 we resurveyed two islands identified as having the best potential for the long-term conservation of crested iguanas, and found that populations were continuing to decline. We suggest that the scarcity of crested iguanas on all islands surveyed is due to the combination of habitat loss and the introduction of exotic predators. All islands surveyed have free ranging goats, forest fires have occurred repeatedly over the last few decades, and feral cats are established on many islands. To reverse the population decline of this species immediate intervention is required on selected islands to halt continuing forest degradation and to clarify the effects of introduced predators.

scholarly journals Dramatic decline of the Vulnerable Reeves's pheasant Syrmaticus reevesii, endemic to central China

Oryx ◽  
2014 ◽  
Vol 49 (3) ◽  
pp. 529-534 ◽  
Author(s):  
Chunfa Zhou ◽  
Jiliang Xu ◽  
Zhengwang Zhang
Keyword(s):  
Protected Areas ◽  
Population Decline ◽  
Iucn Red List ◽  
Central China ◽  
Current Status ◽  
Term Survival ◽  
Field Surveys ◽  
Dramatic Decline ◽  
Syrmaticus Reevesii

AbstractThe current status and distribution of the Vulnerable Reeves's pheasant Syrmaticus reevesii, endemic to central China, is poorly known. To obtain updated information on its status we selected 89 candidate sites in six provinces and one municipality in central China and conducted interviews and field surveys from April 2011 to April 2012. Interviews demonstrated the pheasant has disappeared from 46% of the surveyed sites. Our results also revealed a population decline at 46 sites, including protected areas, although population densities in protected areas were higher than those in non-protected areas. Eighty-three, 26 and 20% of the surveyed sites had evidence of poaching, habitat loss and use of poison, respectively, which were the three major threats to this species. To ensure the long-term survival of Reeves's pheasant in China, protection and management need to be enforced in both protected and non-protected areas. We recommend that this species should be upgraded to a national first-level protected species in China and recategorized as Endangered on the IUCN Red List.

scholarly journals The changing fates of the world's mammals

2011 ◽  
Vol 366 (1578) ◽  
pp. 2598-2610 ◽  
Author(s):  
Michael Hoffmann ◽  
Jerrold L. Belant ◽  
Janice S. Chanson ◽  
Neil A. Cox ◽  
John Lamoreux ◽  
...  
Keyword(s):  
Captive Breeding ◽  
Extinction Risk ◽  
Conservation Status ◽  
Iucn Red List ◽  
Red List ◽  
Mammal Species ◽  
International Union ◽  
The Status ◽  
Conservation Actions ◽  
In The Wild

A recent complete assessment of the conservation status of 5487 mammal species demonstrated that at least one-fifth are at risk of extinction in the wild. We retrospectively identified genuine changes in extinction risk for mammals between 1996 and 2008 to calculate changes in the International Union for Conservation of Nature (IUCN) Red List Index (RLI). Species-level trends in the conservation status of mammalian diversity reveal that extinction risk in large-bodied species is increasing, and that the rate of deterioration has been most accelerated in the Indomalayan and Australasian realms. Expanding agriculture and hunting have been the main drivers of increased extinction risk in mammals. Site-based protection and management, legislation, and captive-breeding and reintroduction programmes have led to improvements in 24 species. We contextualize these changes, and explain why both deteriorations and improvements may be under-reported. Although this study highlights where conservation actions are leading to improvements, it fails to account for instances where conservation has prevented further deteriorations in the status of the world's mammals. The continued utility of the RLI is dependent on sustained investment to ensure repeated assessments of mammals over time and to facilitate future calculations of the RLI and measurement against global targets.

scholarly journals Status of a second viable population of the Critically Endangered Delacour's langur in Viet Nam

Oryx ◽  
2021 ◽  
pp. 1-3
Author(s):  
Anh Tuan Nguyen ◽  
Hoang Trinh-Dinh ◽  
Minh Le ◽  
Nguyen Manh Ha
Keyword(s):  
Habitat Destruction ◽  
Critically Endangered ◽  
Primate Species ◽  
Viet Nam ◽  
Critically Endangered Species ◽  
The North ◽  
The Status ◽  
Viable Population ◽  
Anthropogenic Threats

Abstract One of the three Critically Endangered and endemic primate species in Viet Nam, Delacour's langur Trachypithecus delacouri, is restricted to the north of the country. The largest remaining population is in Van Long Nature Reserve, Ninh Binh Province, and the second largest is in nearby Kim Bang Protection Forest, Ha Nam Province, with other populations believed to be too small for recovery. The population in Van Long has been well studied but the status of that of Kim Bang has not previously been adequately evaluated. To address this, a survey was conducted during 10 August–7 October 2018. In total, we recorded 13 groups comprising a total of at least 73 individuals, almost doubling the highest number reported in previous studies. We documented six new groups in Lien Son and Ba Sao communes in Kim Bang. Our findings indicate there is a high likelihood that Delacour's langur population in Kim Bang will recover and could be important for the long-term conservation of this Critically Endangered species. However, immediate and appropriate conservation measures need to be implemented to protect the population from major anthropogenic threats, namely poaching and habitat destruction, detected during our survey.

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