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TitleRapid decline of the greater European peaclam at the periphery of its distribution
Author(s)Sousa, Ronaldo Gomes
Ilarri, Martina
Souza, Allan T.
Antunes, Carlos
Guilhermino, Lúcia
Heat wave
Minho River
Pisidium amnicum
Issue dateApr-2011
PublisherEDP Sciences
JournalAnnales de Limnologie
Abstract(s)Extirpation or even extinction of freshwater invertebrate species is a neglected conservation issue; declines in abundance and spatial distribution for freshwater invertebrates are far less documented than for vertebrate species. In the Minho River tidal freshwater wetlands (northwest of Iberian Peninsula), a rapid decline in density and biomass of the bivalve Pisidium amnicum was recorded at 16 different sites over seven years, from 2004 to 2010, without any sign of a potential recovery. Mean density values reached more than 80 ind.mx2 in 2004, but declined to less than 1 ind.mx2 in 2009 and 2010. An identical declining trend was observed for biomass. A significant reduction in the spatial distribution also occurred. The abiotic changes resulting from the 2005 heat wave and possibly the negative interactions imposed by the non-indigenous invasive bivalve Corbicula fluminea were the main factors responsible for the declining trends. Given the very low density, P. amnicum is facing a serious risk of extirpation in this ecosystem and conservational measures are urgently needed.
AccessOpen access
Appears in Collections:DBio - Artigos/Papers

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