Individual variability in sub-Arctic krill material properties, lipid composition, and other scattering model inputs affect acoustic estimates of their population
نویسندگان
چکیده
Abstract Target strength model inputs including morphometry, material properties, lipid composition, and in situ orientations were measured for sub-Arctic krill (Euphausia pacifica, Thysanoessa spinifera, T. inermis, raschii) the eastern Bering Sea (EBS, 2016) Gulf of Alaska (GOA, 2017). Inter-species -regional animal lengths significantly different (F1,680 = 114.10, p < 0.01), while shape was consistent all species measured. The polar phosphatidycholine dominant lipid, comprising 86 ± 16% (mean SD) 56 22% total mass GOA EBS krill, respectively. Krill density contrasts varied by region rather than with or local chla fluorescence. Mean orientation 1 31°, 25% observed within ±5° broadside incidence. Modelled target sensitivity frequency independent variations properties but primarily sensitive to morphometry at lower (38 kHz) higher (200 frequencies, Measured variability corresponded an order magnitude difference acoustic estimates biomass 120 kHz. These results provide important constraints scattering models ecologically species.
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ژورنال
عنوان ژورنال: Ices Journal of Marine Science
سال: 2021
ISSN: ['1095-9289', '1054-3139']
DOI: https://doi.org/10.1093/icesjms/fsab045