Björn Malmgvist

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We examined the relationship between drift and foraging activity in Gammarus pulex L. by comparing collections from the benthos, drift, and small traps baited with cheese. Two sites were employed, one with both sculpins and trout, and one lacking fish. Baited traps collected large numbers of G. pulex within as little as 15 min, demonstrating the(More)
The seasonal change in gut contents of nymphs of Isoperla grammatica and I. difformis from six streams in southern Sweden was analysed. Both species had ingested a variety of benthic prey and vegetable matter, predominantly diatoms. Some seasonality was evident with high percentages of diatoms in spring in I. grammatica, and in autumn in I. difformis. The(More)
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