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Nine - Freshwater Fishes: Threatened Species and Threatened Waters on a Global Scale

Published online by Cambridge University Press:  13 April 2023

Norman Maclean
Affiliation:
University of Southampton
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Summary

Worldwide, freshwater biodiversity is in decline and increasingly threatened. Fishes are the best-documented indicators of this decline. General threats to persistence include: (1) competition for water, (2) habitat alteration, (3) pollution, (4) invasions of alien species, (5) commercial exploitation and (6) global climate change. Regional faunas usually face multiple, simultaneous causes of decline. Threatened species belong to all major evolutionary lineages of fishes, although families with the most imperilled species are those with the most species (e.g. Cyprinidae, Cichlidae). Independent evaluation of California’s highly endemic (81%) fish fauna for comparison with IUCN results validates the alarm generated by IUCN evaluations. However, IUCN overall evaluation is conservative, because it does not include many intraspecific taxa for which extinction trends are roughly double those at the species level. Dramatic global loss of freshwater fish species is imminent without immediate and bold actions by multiple countries.

Type
Chapter
Information
The Living Planet
The State of the World's Wildlife
, pp. 177 - 205
Publisher: Cambridge University Press
Print publication year: 2023

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