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Emergent body size of mayfly survivors
Author(s) -
ALEXANDER ALEXA C.,
HEARD KRISTIE S.,
CULP JOSEPH M.
Publication year - 2008
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.2007.01880.x
Subject(s) - mayfly , baetidae , nymph , biology , mesocosm , imidacloprid , survivorship curve , ecology , population density , zoology , population , larva , pesticide , demography , genetics , cancer , ecosystem , sociology
Summary 1. Employing field‐deployed mesocosms, we examined the effects of 12‐h pulse and 20‐day press (continuous) exposures of the common agricultural insecticide, imidacloprid, on nymph abundance, emergence patterns and adult body size of Epeorus spp. (Heptageniidae) and Baetis spp. (Baetidae). 2. In press exposures, reduced nymph density was driven by reduced survivorship; in pulse exposures, reduced nymph density may reflect increased emergence because of stress. 3. Once exposed to imidacloprid, Epeorus and Baetis mayflies developed less and emerged smaller than their control counterparts. Concentrations as low as 0.1 μ g L −1 (12‐h pulse) reduced head length in Baetis and thorax length in Epeorus . 4. In all of the Baetis and Epeorus examined, effects were only found in males. Male survivorship and body size can affect population dynamics. Sublethal doses of this widely applied agricultural insecticide have the potential to reduce reproductive success of mayfly populations.