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VERTICAL DISTRIBUTION AND MIGRATION OF CHAOBORUS FLAVICANS LARVAE IN CORBETT LAKE, BRITISH COLUMBIA 1
Author(s) -
Teraguchi M.,
Teraguchi M.
Publication year - 1966
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1966.11.2.0164
Subject(s) - diel vertical migration , larva , instar , ecology , biology , environmental science , geology
Changes with age in the vertical migratory behavior of Chaoborus flavicans larvae were studied in a small, eutrophic lake by use of Clarke‐Bumpus plankton samplers and a high frequency echo sounder. Marked differences were noted in vertical distribution and diel migration of the four instars. Diel and seasonal changes in timing of ascent and descent of larvae appeared to be controlled by subsurface illumination. Results from observations of vertical migration of different instars held in experimental tubes housed in a darkroom corroborated those of the field. Complete, three‐phase migration cycles were induced by artificially changing natural light intensity over the experimental tubes during midday. These and other experiments suggested that the diel vertical migration of the larvae was an exogenous rhythm controlled by light.