scholarly journals The Chestnut-banded Plover is an overlooked globally Near Threatened Species

2007 ◽  
Vol 17 (3) ◽  
pp. 283-293 ◽  
Author(s):  
Rob Simmons ◽  
Neil Baker ◽  
Rod Braby ◽  
Tim Dodman ◽  
Oliver Nasirwa ◽  
...  
Keyword(s):  
East Africa ◽  
Conservation Status ◽  
Iucn Red List ◽  
World Population ◽  
Population Declines ◽  
Water Abstraction ◽  
Arid Habitat ◽  
Suitable Habitats ◽  
Iucn Red List Criteria ◽  
Near Threatened

AbstractSpecies that show obvious population declines are relatively easy to categorize as globally threatened under IUCN Red List criteria. However, species whose populations are highly concentrated at a few inaccessible sites that are unprotected or habitat-threatened and then disperse are more difficult to pigeon-hole. Here we re-assess the conservation status of one such species – the Chestnut-banded Plover Charadrius pallidus – that occurs across Africa in specialized, inaccessible and arid habitat. Wetland bird counts from 1991 to the present allow us to determine a new world population estimate of about 17,830 birds. This allows us to determine a new 1% level and we identified only eight sites in southern and East Africa where these plovers congregate in numbers >1% when non-breeding. There are only five other sites that hold more than 100 birds, indicating that the species is not simply widely dispersed across suitable habitats. Simultaneous counts across southern and East Africa indicate that just three sites – Walvis Bay and Sandwich Harbour in Namibia and Lake Natron in Tanzania – can hold 87% of the world population during non-breeding periods. Since two of these sites are under threat from pollution, siltation and water abstraction, and the eight sites in total comprise just 30% of the area criteria set by IUCN, the bird meets one of the two qualifiers for globally Vulnerable status. Despite this, we cannot detect any long-term declines in population size, partly because of wide variations in population numbers over decadal time periods (itself an IUCN qualifier). It is clear that this bird should move from its present Least Concern status to Near Threatened and conservation measures be enacted at two of the top three sites – Walvis Bay and Lake Natron.

scholarly journals Conservation status assessment of the amphibians and reptiles of Uruguay

2010 ◽  
Vol 100 (1) ◽  
pp. 05-12 ◽  
Author(s):  
Andrés Canavero ◽  
Santiago Carreira ◽  
José A. Langone ◽  
Federico Achaval ◽  
Claudio Borteiro ◽  
...  
Keyword(s):  
Native Species ◽  
Conservation Status ◽  
Iucn Red List ◽  
Critically Endangered ◽  
Amphibian Species ◽  
Status Assessment ◽  
Data Deficient ◽  
Iucn Red List Criteria ◽  
Definition Of ◽  
Near Threatened

The native species of amphibians and reptiles of Uruguay were categorized according to the IUCN Red List criteria. Out of 47 amphibian species, seven are listed as Critically Endangered (CR), five as Endangered (EN), one as Vulnerable (VU), three as Near Threatened (NT), and two as Data Deficient (DD); the remaining species are considered to be Least Concern (LC). Among the 64 species of reptiles evaluated, one is listed as Critically Endangered (CR), seven as Endangered (EN), two as Vulnerable (VU), one as Near Threatened (NT) and seven as Data Deficient (DD); the rest are considered to be Least Concern (LC). The use of these results as an additional criterion in the definition of protected areas in Uruguay will contribute towards the conservation of the aforementioned threatened species and their associated ecosystems.

scholarly journals Genetic structure and conservation status of Astragalus subrecognitus (Fabaceae): a very rare and narrow endemic species

2020 ◽  
Vol 153 (1) ◽  
pp. 101-107
Author(s):  
Ali Bagheri ◽  
Shabnam Abbasi ◽  
Mohammad Mahmoodi ◽  
Azadeh Akhavan Roofigar ◽  
Frank R. Blattner
Keyword(s):  
Genetic Structure ◽  
Endemic Species ◽  
Conservation Status ◽  
Allelic Diversity ◽  
Iucn Red List ◽  
Effective Population ◽  
Geographic Origins ◽  
Genetic Clusters ◽  
Suitable Habitats ◽  
Iucn Red List Criteria

Background and aims – Narrow endemics, characterized by small distribution areas and small effective population sizes are prone to extinction due to low genetic variation caused by genetic bottlenecks and drift together with the danger of habitat loss. Astragalus subrecognitus is an endemic species that only occurs in northwestern Iran in mountain steppe at higher elevations above the Qezel Ozan River in the province Zanjan. Methods – In this study, we investigated the genetic structure of the populations of A. subrecognitus using inter simple sequence repeats (ISSR) and sequence-related amplified polymorphism (SRAP) as molecular markers.Key results – We detected two genetic groups, which do however not concur with the geographic origins east and west of the Qezel Ozan River. Extant gene flow between these populations is rather unlikely given their distance of c. 70 km and the lack of suitable habitats for this species in lower areas of the valley in between. Conclusions – From this we conclude that we see an older pattern of geographic isolation that was followed by an exchange of genotypes during a time when migration through the valley was possible. Still, admixture between both genetic clusters was found only in one individual, indicating that broadening of allelic diversity by hybridization between individuals belonging to different genetic clusters might be a slow process. Due to the small size of the population, sparse inhabited area, and also very slow or even lack of regeneration in some places we consider A. subrecognitus according to IUCN Red List criteria as ‘endangered’ species.

scholarly journals Habitat associations and conservation status of an endemic forest dwarf chameleon (Bradypodion sp.) from South Africa

Oryx ◽  
2006 ◽  
Vol 40 (2) ◽  
pp. 183-188 ◽  
Author(s):  
Walter J. Reisinger ◽  
Devi M. Stuart-Fox ◽  
Barend F.N. Erasmus
Keyword(s):  
South Africa ◽  
Conservation Status ◽  
Canopy Cover ◽  
Iucn Red List ◽  
Habitat Associations ◽  
Suitable Habitat ◽  
Area Of Occupancy ◽  
Forest Interior ◽  
Forest Remnants ◽  
Iucn Red List Criteria

We quantified habitat associations and evaluated the conservation status of a recently identified, undescribed species of dwarf chameleon, Bradypodion sp. nov. Dhlinza, endemic to scarp forest remnants in KwaZulu-Natal Province, South Africa. At the microhabitat scale the Dhlinza dwarf chameleon was found more often in forest gaps and near paths than highly disturbed edges or forest interior. Chameleon presence was not explained by forest physiognomic variables such as vine cover, shrub and tree density, or canopy cover. Presence near gaps may be better explained by the combined effects of the thermal microenvironment and food availability. The species is moderately common where it occurs, with estimated densities of 4.7, 8.7 and 29.7 individuals per ha within forest interior, edges and gaps respectively. At the landscape scale, the chameleon occurs only in three remnant forests: the Dhlinza, Entumeni and Ongoye Forests. The species' extent of occurrence was estimated to be 88 km2 and its area of occupancy 49 km2. Based on the small area of remaining suitable habitat, this species meets the requirements for categorization as Endangered according to IUCN Red List criteria.

scholarly journals Flueggea acicularis (Phyllanthaceae), a narrow endemic species rediscovered in central China

PhytoKeys ◽  
2021 ◽  
Vol 172 ◽  
pp. 57-66
Author(s):  
Songzhi Xu ◽  
Qiliang Gan ◽  
Lianzhong Fu ◽  
Mingxi Jiang ◽  
Zhenyu Li
Keyword(s):  
Conservation Status ◽  
Field Investigation ◽  
Iucn Red List ◽  
Central China ◽  
Karst Region ◽  
Morphological Description ◽  
Chongqing Municipality ◽  
Iucn Red List Criteria ◽  
First Time ◽  
A New Species

Flueggea acicularis (Phyllanthaceae) is endemic to the karst region of central China. Male specimens of this species were first collected in 1908. In 1989, female plants of F. acicularis were found for the first time, but misidentified as a new species. Throughout this period the male plants of F. acicularis were mismatched with female plants of other species, and male plants had not been collected since 1908. Then, in March, 2009, the authors rediscovered a wild population of F. acicularis consisting of both male and female plants in Wuxi county, Chongqing municipality, China. Based on field investigation and examination of specimens, we matched the correct female and male plants of this species for the first time since its initial publication a century ago. A complete and accurate morphological description, distribution, habitat and phenology of this species are also provided. Furthermore, the conservation status of F. acicularis is assessed as “Near Threatened” (NT) according to the IUCN Red List criteria.

scholarly journals Chiococca grandiflora (Rubiaceae), a new species from Northern Mexico

PhytoKeys ◽  
2018 ◽  
Vol 98 ◽  
pp. 73-83 ◽  
Author(s):  
David H. Lorence ◽  
Thomas R. Van Devender ◽  
George M. Ferguson
Keyword(s):  
New Species ◽  
Conservation Status ◽  
Iucn Red List ◽  
Red List ◽  
Northern Mexico ◽  
Iucn Red List Criteria ◽  
A New Species

The new species Chiococcagrandiflora Lorence & T.Van Devender from Sinaloa and Sonora, Mexico differs from its congeners by its larger, showy white flowers in compact cymes of 3–9, and infundibuliform corollas 16–20 mm long with tubes 13–17 mm long and lobes 3–3.5 mm long. Its distribution, habitat, and relationships are outlined. The conservation status for this species is estimated to be Endangered (EN) based on IUCN Red List Criteria.

Recent Progress in Taxonomic Studies, Biogeographic Analysis, and Revised Checklist of Amphibians in Indochina

2021 ◽  
Vol 28 (3A) ◽  
pp. 1-110
Author(s):  
Nikolay A. Poyarkov ◽  
Tan Van Nguyen ◽  
Evgeniy S. Popov ◽  
Peter Geissler ◽  
Parinya Pawangkhanant ◽  
...  
Keyword(s):  
Conservation Status ◽  
Distribution Patterns ◽  
Iucn Red List ◽  
Type Specimens ◽  
Amphibian Species ◽  
Biogeographic Patterns ◽  
South Vietnam ◽  
Data Deficient ◽  
Iucn Red List Criteria ◽  
Annotated Checklist

The Indochinese Peninsula is recognized as one of the key global biodiversity hotspots. The amphibian fauna of Indochina (including Vietnam, Laos, Cambodia and Thailand) is one of the richest in the world. About 60% of the known species were described within the last 20 years. We review the literature and our data to assess all recent discoveries and taxonomic changes and compile the first annotated checklist of the amphibian fauna of Indochina since the middle of the 20th century, including updated faunal lists for Vietnam and Thailand. Amphibian checklists for Laos and Cambodia are published for the first time. For each species we provide the following information: scientific name; recommended common name in English; information on type specimens; type locality; data on its distribution within Indochina and beyond; IUCN conservation status; taxonomic comment and the most important references. We review the distribution of each species across the 23 biogeographic subregions of Indochina, estimate the similarity among the regional faunas and evaluate their species richness and endemism. In total we record 423 amphibian species belonging to three orders, 11 families and 71 genera; 199 species (47%) are endemic to Indochina. Comprising 270 known species, the amphibian fauna of Vietnam is the richest (98 endemics, 36.3%), followed by Thailand with 194 species (29 endemics, 14.9%), Laos with 121 species (13 endemics, 10.7%), and Cambodia with 72 species (6 endemics, 8.3%). A cluster analysis of faunal similarity between the subregions shows two major assemblages, divided by the Isthmus of Kra. Within the northern mainland portion of Indochina three clusters can be distinguished: (1) northeastern and northwestern uplands of Vietnam and northern Laos; (2) Northern, Central, and Southern Annamites, the Bolaven Plateau, and central-south Vietnam lowlands; (3) western Indochinese subregions. We identify the Northeast and Northwest Uplands of Vietnam, the Northern, Central and Southern Annamites, the Cardamom Mountains, the mountains of Northeast Thailand, Northern Tenasserim and southern Peninsular Thailand as nine major centers of diversity and endemism of Indochinese amphibians. The analysis of amphibian distribution patterns across Indochina suggests the presence of 14 chorotypes grouped in five major range types. Our results underline the role of Indochina as a key area for amphibian diversity and conservation. Among 423 species of Indochinese amphibians, 152 species (35.9%) were considered as data deficient (DD) or were not evaluated (NE) according to the IUCN Red List criteria; while 76 species (18.0%) were considered vulnerable (VU), endangered (EN) or critically endangered (CR), 20 species (4.7%) were considered to be near threatened (NT), and 175 species (41.4%) to be of the least concern (LC). Our study thus has implications for further conservation efforts on regional and global levels, as well as for understanding the biogeographic patterns of amphibian richness and endemism in Asia.

A new grass frog with rupicolous tadpoles from northern Zambia (Anura: Ptychadenidae)

Zootaxa ◽  
2018 ◽  
Vol 4462 (3) ◽  
pp. 349
Author(s):  
ALAN CHANNING ◽  
FRANK WILLEMS
Keyword(s):  
New Species ◽  
Population Size ◽  
Dna Sequences ◽  
Iucn Red List ◽  
Red List ◽  
Advertisement Call ◽  
Limited Extent ◽  
Iucn Red List Criteria ◽  
A New Species ◽  
Near Threatened

We describe a new species of Ptychadena from Mutinondo Wilderness in northern Zambia. It has rupicolous tadpoles that develop in a film of water. The species is distinguished on morphology, advertisement call and DNA sequences from other grass frogs and was found to be most closely related to P. broadleyi. It has no contrasting longitudinal bands on the posterior thigh, the foot is longer than half SVL, it has no light triangle on the snout, three phalanges of the fourth toe free of web and the snout has no skin folds. The species should be considered Near Threatened in terms of the IUCN Red List criteria given its limited extent of occurrence and population size. 

scholarly journals The jaguar's spots are darker than they appear: assessing the global conservation status of the jaguar Panthera onca

Oryx ◽  
2017 ◽  
Vol 52 (2) ◽  
pp. 300-315 ◽  
Author(s):  
J. Antonio de la Torre ◽  
José F. González-Maya ◽  
Heliot Zarza ◽  
Gerardo Ceballos ◽  
Rodrigo A. Medellín
Keyword(s):  
Human Population ◽  
Conservation Status ◽  
Conservation Policy ◽  
Iucn Red List ◽  
Red List ◽  
Panthera Onca ◽  
Policy And Practice ◽  
Area Of Occupancy ◽  
Global Status ◽  
Iucn Red List Criteria

AbstractThe IUCN Red List is widely used to guide conservation policy and practice. However, in most cases the evaluation of a species using IUCN Red List criteria takes into account only the global status of the species. Although subpopulations may be assessed using the IUCN categories and criteria, this rarely occurs, either because it is difficult to identify subpopulations or because of the effort involved. Using the jaguar Panthera onca as a model we illustrate that wide-ranging species that are assigned a particular category of threat based on the IUCN Red List criteria may display considerable heterogeneity within individual taxa in terms of the level of risk they face. Using the information available on the conservation status of the species, we evaluated the jaguar's current geographical range and its subpopulations. We identified the most threatened subpopulations, using the extent of occurrence, area of occupancy, population size and the level of threat to each subpopulation. The main outcome of this analysis was that although a large subpopulation persists in Amazonia, virtually all others are threatened because of their small size, isolation, deficient protection and the high human population density. Based on this approach, future conservation efforts can be prioritized for the most threatened subpopulations. Based on our findings we recommend that for future Red List assessments assessors consider the value of undertaking assessments at the subpopulation level. For the jaguar, sub-global assessments should be included on the Red List as a matter of urgency.

Peperomia (Piperaceae) novelties from Veracruz State, Mexico

Phytotaxa ◽  
2015 ◽  
Vol 205 (4) ◽  
pp. 268 ◽  
Author(s):  
Guido Mathieu ◽  
Daniela Vergara-Rodriguez ◽  
Thorsten Krömer ◽  
Dirk Nikolaus Karger
Keyword(s):  
Conservation Status ◽  
Field Work ◽  
Iucn Red List ◽  
Red List ◽  
Taxonomic Treatment ◽  
Iucn Red List Criteria

The preparation of a taxonomic treatment of the genus Peperomia (Piperaceae) for the ‘Flora of Veracruz’, revealed that three species remained without being described. This finding is a result of the review and study of botanical collections in several Mexican and foreign herbaria, as well as of field work in order to collect living and fertile material, which allowed us to describe and illustrate the species as new to science. Two of these, P. chazaroi and P. vazquezii, appear to be endemic to Veracruz, whereas P. parastriata was also found in the neighboring states Chiapas and Oaxaca. The treatment includes assessments of conservation status considering IUCN Red List criteria.

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