Influence of salinity and prey presence on the survival of aquatic macroinvertebrates of a freshwater marsh

Aquatic Ecology
Louisiana Department of Wildlife and Fisheries; U.S. Fish and Wildlife Service; International Crane Foundation; Louisiana State University AgCenter Animal Care
By:  and 

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Abstract

Salinization of coastal freshwater environments is a global issue. Increased salinity from sea level rise, storm surges, or other mechanisms is common in coastal freshwater marshes of Louisiana, USA. The effects of salinity increases on aquatic macroinvertebrates in these systems have received little attention, despite the importance of aquatic macroinvertebrates for nutrient cycling, biodiversity, and as a food source for vertebrate species. We used microcosm experiments to evaluate the effects of salinity, duration of exposure, and prey availability on the relative survival of dominant aquatic macroinvertebrates (i.e., Procambarus clarkii Girard, Cambarellus puer Hobbs, Libellulidae, Dytiscidae cybister) in a freshwater marsh of southwestern Louisiana. We hypothesized that increased salinity, absence of prey, and increased duration of exposure would decrease survival of aquatic macroinvertebrates and that crustaceans would have higher survival than aquatic insect taxon. Our first hypothesis was only partially supported as only salinity increases combined with prolonged exposure duration affected aquatic macroinvertebrate survival. Furthermore, crustaceans had higher survival than aquatic insects. Salinity stress may cause mortality when acting together with other stressful conditions.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Influence of salinity and prey presence on the survival of aquatic macroinvertebrates of a freshwater marsh
Series title Aquatic Ecology
DOI 10.1007/s10452-012-9410-3
Volume 46
Issue 4
Year Published 2012
Language English
Publisher Nederlandse Vereniging voor Aquatische Ecologie
Publisher location Dordrecht
Contributing office(s) Coop Res Unit Atlanta
Description 10 p.
First page 411
Last page 420
Online Only (Y/N) N
Additional Online Files (Y/N) N