Krill space: A comparative assessment of mesoscale structuring in polar and temperate marine ecosystems

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Santora, J. A., Sydeman, W. J., Schroeder, I. D., Reiss, C. S., Wells, B. K., Field, J. C., … Loeb, V. J. (2012). Krill space: A comparative assessment of mesoscale structuring in polar and temperate marine ecosystems. ICES Journal of Marine Science, 69(7), 1317-1327. doi:10.1093/icesjms/fss048
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TitleKrill space: A comparative assessment of mesoscale structuring in polar and temperate marine ecosystems
AuthorsJ. Santora, W. Sydeman, I. Schroeder, C. Reiss, B. Wells, J. Field, A. Cossio, V. Loeb
AbstractThe spatial organization, mesoscale variability, and habitat associations of krill within portions of the Antarctic Peninsula and California Current marine ecosystems are compared. Using a decade of acoustic observations and remotely sensed oceanography (20002009), the hypothesis that mesoscale spatial organization of krill in both systems closely relates to geospatial variability of the shelf break and is non-linearly related to geostrophic flow and positively related to chlorophyll a (Chl a) is tested. Directional-dependence analysis to measure spatial variability of krill is used along with spatially explicit generalized additive models to quantify and compare the spatial relationships among krill and habitat characteristics in both systems. The results suggest the following aspects of krill spatial organization: (i) areas of dense aggregation, i.e. hot spots, are present in both systems and are orientated in the direction of the shelf break, (ii) moderate levels of eddy kinetic energy seem to concentrate krill in favourable habitats and lessen the likelihood of advection away from the system, and (iii) variable responses to surface Chl a concentration suggest that real-time Chl a values may not be useful as a global predictor of important krill habitat. The results provide valuable reference points for marine spatial management of krill and for refining ecosystem and foodweb models.
JournalICES Journal of Marine Science
Date2012
Start page1317
End page1327
ISSN10543139
Subjectsacoustic method, advection, aggregation behavior, chlorophyll a, comparative study, crustacean, food web, geostrophic flow, kinetic energy, marine ecosystem, mesoscale eddy, oceanography, polar region, real time, remote sensing, shelf break, spatial analysis, temperate environment, Antarctic Peninsula, Antarctica, California Current, Pacific Ocean, West Antarctica, Euphausiacea
NoteCited By (since 1996):5, CODEN: ICESE

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