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Factors affecting the distribution of some Phryganeaeid (Trichoptera) in Malham Tarn, Yorkshire
Author(s) -
BRAY R. P.
Publication year - 1971
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.1365-2427.1971.tb01553.x
Subject(s) - shore , habitat , ecology , biology , larva , vegetation (pathology) , potamogeton , aquatic plant , macrophyte , fishery , medicine , pathology
Summary This paper describes a distribution problem involving Agrypnetes crassicornis and Phryganea obsoleta (Trichoptera : Phryganeidae) in Malham Tarn, Yorkshire. The only suitable habitat for their larvae is the offshore vegetation, chiefly Chara delicatula , but owing to the specialized egglaying behaviour of this family and the absence of other sites, the eggs of Agrypnetes crassicornis are laid on the exposed rocky shoreline. The situation with Phryganea obsoleta differs in that the emergence of Potamogeton spp. provides new oviposition sites away from the shore. Investigations on both species however have provided further support for an hypothesis which postulates the importance of wind‐induced water movements in rapidly dispersing newly hatched insect larvae to the favourable habitats in deep water.