1986
DOI: 10.3354/meps031067
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Variations in the size of Antarctic krill, Euphausia superba Dana, in small swarms

Abstract: Studies on the characteristics of krill in individual swarms require sampling methods which ensure that the swarms are sampled discretely. A study on the size composition of krill swarms using an enlarged Longhurst-Hardy plankton recorder (LLHPR) and an echosounder reveal that the length frequency distnbutions of krill in adjacent swarnls were often significantly different. In contrast, length frequency distnbutions from within the same swarm were not usually significantly different and any differences were pr… Show more

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Cited by 32 publications
(24 citation statements)
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“…The abundance of Antarctic krill makes it a key species in the Antarctic food web and, increasingly, an important resource for fisheries. Antarctic krill often occur within dense swarms characterized by uniform length-frequency distributions (Watkins, 1986) and synchronized cycles of moulting and spawning (Buchholz et al, 1996). Marr (1962) considered such non-random distribution of krill to start from the larval stage and continue through development, with each swarm being a separate entity that is 'discrete and complete in itself'.…”
Section: Introductionmentioning
confidence: 99%
“…The abundance of Antarctic krill makes it a key species in the Antarctic food web and, increasingly, an important resource for fisheries. Antarctic krill often occur within dense swarms characterized by uniform length-frequency distributions (Watkins, 1986) and synchronized cycles of moulting and spawning (Buchholz et al, 1996). Marr (1962) considered such non-random distribution of krill to start from the larval stage and continue through development, with each swarm being a separate entity that is 'discrete and complete in itself'.…”
Section: Introductionmentioning
confidence: 99%
“…Krill aggregative behavior is not restricted to adults, but is also seen in larval forms (Marr, 1962;Hamner et al, 1989). The persistent occurrence of krill in such aggregations has led many authors to suggest that the krill swarm constitutes the basic ecological unit of the species (Watkins, 1986). These aggregations are highly recognizable with hydroacoustic instruments, making the krill a model species for the in situ study of zooplankton aggregation.…”
Section: Acknowledgmentsmentioning
confidence: 99%
“…Although thresholding the 120 kHz data at -70 dB decreases the likelihood of mistakenly accepting scattering from animals with smaller target strengths than krill or occurring at lower densities, it may also exclude some scattering from krill present at low densities. Antarctic krill are not thought to occur often or at large abundances outside of aggregations (Watkins, 1986), however. Furthermore, the majority of observed biomass was accounted for by a minority of very large and dense aggregations that easily passed the threshold criterion, and so the impact on overall biomass of any krill excluded by the threshold should be small.…”
Section: Acoustic Methodologiesmentioning
confidence: 99%
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