scispace - formally typeset
Search or ask a question
Topic

Critically endangered

About: Critically endangered is a research topic. Over the lifetime, 3875 publications have been published within this topic receiving 78961 citations.


Papers
More filters
DOI
27 Oct 2010

20,272 citations

Book
28 Jun 1996
TL;DR: The "1994 Red List of Threatened Animals" as mentioned in this paper was a major advance on its predecessors in clarity of layout and amount of information presented, and was taken further in the 1996 edition, which was also the first global compilation to use the complete new IUCN red list category system.
Abstract: The "1994 Red List of Threatened Animals" was a major advance on its predecessors in clarity of layout and amount of information presented. This is taken further in the 1996 edition, which is also the first global compilation to use the complete new IUCN red list category system. Also for the first time, all mammal species have been assessed. This group and the birds are the only taxonomic classes where a comprehensive evaluation has been made. The reptiles, amphibians and fishes previously listed have been reassessed using the new system, and future editions will aim to cover all species in these groups.

1,103 citations

Book
01 Jan 2000
TL;DR: The 2000 Red List combines animals and plants into a single list containing assessments of more that 18,000 taxa and there has been a significant increase in the number of species assessments.
Abstract: The 2000 Red List combines animals and plants into a single list containing assessments of more that 18,000 taxa A large number of species has been reassessed and there has been a significant increase in the number of species assessments Documentation on each species has been improved

1,072 citations

Journal ArticleDOI
TL;DR: The process and the technical background to the IUCN Red List system is described, which was designed to measure the symptoms of extinction risk, and uses 5 independent criteria relating to aspects of population loss and decline of range size.
Abstract: The International Union for Conservation of Nature (IUCN) Red List of Threatened Species was increasingly used during the 1980s to assess the conservation status of species for policy and planning purposes. This use stimulated the development of a new set of quantitative criteria for listing species in the categories of threat: critically endangered, endangered, and vulnerable. These criteria, which were intended to be applicable to all species except microorganisms, were part of a broader system for classifying threatened species and were fully implemented by IUCN in 2000. The system and the criteria have been widely used by conservation practitioners and scientists and now underpin one indicator being used to assess the Convention on Biological Diversity 2010 biodiversity target. We describe the process and the technical background to the IUCN Red List system. The criteria refer to fundamental biological processes underlying population decline and extinction. But given major differences between species, the threatening processes affecting them, and the paucity of knowledge relating to most species, the IUCN system had to be both broad and flexible to be applicable to the majority of described species. The system was designed to measure the symptoms of extinction risk, and uses 5 independent criteria relating to aspects of population loss and decline of range size. A species is assigned to a threat category if it meets the quantitative threshold for at least one criterion. The criteria and the accompanying rules and guidelines used by IUCN are intended to increase the consistency, transparency, and validity of its categorization system, but it necessitates some compromises that affect the applicability of the system and the species lists that result. In particular, choices were made over the assessment of uncertainty, poorly known species, depleted species, population decline, restricted ranges, and rarity; all of these affect the way red lists should be viewed and used. Processes related to priority setting and the development of national red lists need to take account of some assumptions in the formulation of the criteria.

1,057 citations

01 Jan 2004
TL;DR: In this article, the authors report estimates of declines of natural ecosystems in the United States, provide a rationale for ecosystem-level conservation, discuss decline and threat as criteria for conservation, and relate ecosystem losses to endangerment at species and population levels.
Abstract: We report estimates of declines of natural ecosystems in the United States, provide a rationale for ecosystem-level conservation, discuss decline and threat as criteria for conservation, and relate ecosystem losses to endangerment at species and population levels. Ecosystems are defined generally and at various spatial scales and include vegetation types, plant associations, natural communities, and habitats defined by floristics, structure, age, geography, condition, and other ecologically relevant factors. The methodology for this report consisted of a literature review and a survey of conservation agencies and professionals. The results of this preliminary study indicated significant losses of biodiversity at the ecosystem level in the United States. The most substantial losses were summarized by listing ecosystems as critically endangered (>98% decline), endangered (85-98% decline), and threatened (70-84% decline). We identified more than 30 critically endangered, 58 endangered, and more than 38 threatened ecosystems. Losses of all kinds of ecosystems have been most pronounced in the South, Northeast, and Midwest, and in California. We suggest that integrated conservation plans for all ecosystems be developed in each ecoregion of the United States, starting with types and regions that sustained the greatest losses and are at greatest risk of further loss. Conservation plans could be based on detailed studies of ecosystem status and trends and include quantitative analyses of ecosystem decline, ecological consequences of loss and degradation, and current and potential threats to each ecosystem. Ecosystem conservation need not be restricted to pristine sites, which are now almost nonexistent. Rather, management and, where possible, restoration plans for native biodiversity in partially disturbed sites should be considered.

1,010 citations


Network Information
Related Topics (5)
Endangered species
18.7K papers, 397.4K citations
90% related
Habitat
25.2K papers, 825.7K citations
87% related
Habitat destruction
8.5K papers, 386K citations
87% related
Biodiversity
44.8K papers, 1.9M citations
86% related
Habitat fragmentation
5.3K papers, 269.9K citations
84% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023208
2022437
2021397
2020317
2019264
2018249