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Hydroacoustic measurement of the density of the Baikal macrozooplankter Macrohectopus branickii
Publication year - 1993
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.1993.38.2.0425
Subject(s) - diel vertical migration , echo sounding , abundance (ecology) , range (aeronautics) , population density , population , environmental science , atmospheric sciences , mineralogy , geology , oceanography , biology , ecology , demography , materials science , sociology , composite material
Experimental studies and statistical analyses were performed to evaluate hydroacoustic methods for assessing the density of Macrohectopus branickii (Amphipoda, Gammaridae) in Lake Baikal. Minimal registered abundance (expressed as volume) appeared to be <1 mg m −3 (echosounder at a frequency of 200 kHz). Patterns of Macrohectopus diel vertical migration varied with individual age, size, and sex. It is preferable to assess abundance of Macrohectopus at night when the population is distributed primarily in the upper 100 m. Under these conditions, acoustic estimates of animal densities can be made by applying calculated data on the scattering ability of Macrohectopus within the size range of 1–30 mm: TS(kg) = −36.8±0.5 dB kg −1 (mean ±95% C.I.).