Journal
ICES JOURNAL OF MARINE SCIENCE
Volume 70, Issue 4, Pages 883-891Publisher
OXFORD UNIV PRESS
DOI: 10.1093/icesjms/fst034
Keywords
aggregation; bio-acoustics; density; mysids; net sampling; patchiness; size-assortation; swarm
Categories
Funding
- US Office of Naval Research [N000140910475]
Ask authors/readers for more resources
Simultaneous multifrequency acoustic echosounders (70, 120, 200, 333, and 710 kHz), net tows, and video sampling were conducted on dense mysid aggregations in coastal waters off OR, USA, to study intra-patch dynamics in mysid swarms. Multifrequency differencing techniques demonstrated submetre, intra-patch clustering of individual mysids of different frequency response characteristics in all 33 samples collected. For samples that contained multiple sizes of mysids, frequency response curves showed a consistent peak 200 kHz. Samples dominated by only a single size class of small (5 mm long mysids) had a peak in scattering at 710 kHz. Intra-patch clustering of heterogeneous individuals shown here demonstrates patchiness at the scales of interactions among individual mysids; however, this patchiness is likely averaged out at the scale of large predator-mysid swarm interactions or the scale typical of most scientific surveys.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available