New PDF release: Aquatic insects: challenges to populations: proceedings of

By Jill Lancaster, Rob A Briers

ISBN-10: 1845933966

ISBN-13: 9781845933968

Bugs are a various, various and critical crew in aquatic habitats, occupying key useful and ecological roles. This edited quantity brings jointly said specialists in usually disparate fields starting from body structure via ecology to evolution to think about in a unified demeanour the demanding situations dealing with insect populations in aquatic environments and the way they've got tailored to accomplish such prominence in nearly all habitats. it will likely be of significant curiosity to researchers and scholars in aquatic bugs and normal entomology.

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Extra info for Aquatic insects: challenges to populations: proceedings of the Royal Entomological Society's 24th symposium

Sample text

Given the extraordinary salt concentrations that the larvae experience, the first issue to address is the size of the gradients across the cuticle. All the species of brine fly examined to date are osmoregulators (Simpson, 1976). 1 shows the concentration of ions measured in the larval haemolymph of E. hians reared in water from Mono Lake, as well as the ionic concentrations in the external water (Shimizu and Bradley, 1994). The haemolymph had a total osmotic concentration of about 300 mOsm under these circumstances; the osmotic concentration of the lake was well over 1500 mOsm.

This creates a substantial physiological problem for freshwater and terrestrial animals. The insects got around this problem by reducing the amount of sodium in the body to an essential minimum. Indeed, in some insect species, sodium is restricted to tiny compartments surrounding the nerves. Other osmotically active osmolytes occur in the blood of many insects. Having evolved as a group supremely adapted to terrestrial and freshwater habitats, the insects have neural and excretory systems geared to obtaining and retaining sodium.

The lime crystals serve as ballast, permitting the larva to remain submerged in highly Saline-water Insects 27 saline water, which is more dense than most biological materials. The precipitation of carbonate and bicarbonate contributes to pH regulation in the larvae. Sutcliffe (1960) showed that brine flies produce a urine more concentrated than the medium in which they reside. Shimizu and Bradley (1994) demonstrated that the rectum was not the site of hyperosmotic urine formation in E. hians. The rectum has a very thin epithelium and the cells do not exhibit the ultrastructural specializations (highly folded membranes and numerous mitochondria) expected in tissues active in ion transport.

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Aquatic insects: challenges to populations: proceedings of the Royal Entomological Society's 24th symposium by Jill Lancaster, Rob A Briers

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