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Temperature influences on water permeability and chlorpyrifos uptake in aquatic insects with differing respiratory strategies
Author(s) -
Buchwalter David B.,
Jenkins Jeffrey J.,
Curtis Lawrence R.
Publication year - 2003
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1897/02-350
Subject(s) - chlorpyrifos , environmental chemistry , biology , respiratory system , ecology , toxicology , chemistry , pesticide , anatomy
Aquatic insects have evolved diverse respiratory strategies that range from breathing atmospheric air to breathing dissolved oxygen. These strategies result in vast morphological differences among taxa in terms of exchange epithelial surface areas that are in direct contact with the surrounding water that, in turn, affect physiological processes. This paper examines the effects of acute temperature shifts on water permeability and chlorpyrifos uptake in aquatic insects with different respiratory strategies. While considerable differences existed in water permeability among the species tested, acute temperature shifts raised water influx rates similarly in air‐breathing and gill‐bearing taxa. This contrasts significantly with temperature‐shift effects on chlorpyrifos uptake. Temperature shifts of 4.5°C increased 14 C‐chlorpyrifos accumulation rates in the gill‐bearing mayfly Cinygma sp. and in the air‐breathing hemipteran Sigara washingtonensis. However, the temperature‐induced increase in 14 C‐chlorpyrifos uptake after 8 h of exposure was 2.75‐fold higher in Cinygma than in Sigara. Uptake of 14 C‐chlorpyrifos was uniformly higher in Cinygma than in Sigara in all experiments. These findings suggest that organisms with relatively large exchange epithelial surface areas are potentially more vulnerable to both osmoregulatory distress as well as contaminant accumulation. Temperature increases appear more likely to impact organisms that have relatively large exchange epithelial surface areas, both as an individual stressor and in combination with additional stressors such as contaminants.