Predator-guided sampling reveals biotic structure in the bathypelagic

Proceedings. Biological Sciences
Kelly J Benoit-BirdMark A Moline

Abstract

We targeted a habitat used differentially by deep-diving, air-breathing predators to empirically sample their prey's distributions off southern California. Fine-scale measurements of the spatial variability of potential prey animals from the surface to 1,200 m were obtained using conventional fisheries echosounders aboard a surface ship and uniquely integrated into a deep-diving autonomous vehicle. Significant spatial variability in the size, composition, total biomass, and spatial organization of biota was evident over all spatial scales examined and was consistent with the general distribution patterns of foraging Cuvier's beaked whales (Ziphius cavirostris) observed in separate studies. Striking differences found in prey characteristics between regions at depth, however, did not reflect differences observed in surface layers. These differences in deep pelagic structure horizontally and relative to surface structure, absent clear physical differences, change our long-held views of this habitat as uniform. The revelation that animals deep in the water column are so spatially heterogeneous at scales from 10 m to 50 km critically affects our understanding of the processes driving predator-prey interactions, energy transfer, biog...Continue Reading

Associated Datasets

Citations

Jun 14, 2018·The Journal of Experimental Biology·J A Goldbogen, P T Madsen
Nov 23, 2019·Marine Pollution Bulletin·Maria BegerLeanne Fernandes

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