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Spatial difference in feeding habits but similar foraging strategy for energy acquisition in jumbo squid

Spatial difference in feeding habits but similar foraging strategy for energy acquisition in... Obtaining sufficient energy is vital for maintaining basal functions and supporting physiological activities, but there is still a lack of empirical data related to foraging strategies in relation to energy acquisition. We investigated the foraging strategy of the jumbo squid Dosidicus gigas when energy demands for growth and reproduction increase as maturation. The analyses are based on the energy density technique to determine energy accumulation and stable isotope analysis to evaluate feeding habits, as well as quantification of the relationship between energy accumulation and isotopic values. We argue that mature female D. gigas may either exclusively feed on high trophic prey items, or increase food intake with opportunistic feeding to meet energy demands. Results indicated that mature female D. gigas varied in energy accumulation between equatorial waters and the north and south of Peru’s Exclusive Economic Zone. Similar results were obtained by analyzing the spatial differences in δ15N and δ13C, and isotopic niches. In contrast, mature D. gigas exhibit a positive relationship between energy accumulation and δ15N, but little evidence for a correlation between energy accumulation and δ13C or chlorophyll a concentration. Cumulatively, our results provide evidence that mature female D. gigas differ spatially in energy accumulation and feeding habits, but have a foraging strategy that increases the intake of higher trophic prey items to meet energy demands for growth and reproduction. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aquatic Ecology Springer Journals

Spatial difference in feeding habits but similar foraging strategy for energy acquisition in jumbo squid

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References (75)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer Nature B.V. 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
ISSN
1386-2588
eISSN
1573-5125
DOI
10.1007/s10452-023-10035-9
Publisher site
See Article on Publisher Site

Abstract

Obtaining sufficient energy is vital for maintaining basal functions and supporting physiological activities, but there is still a lack of empirical data related to foraging strategies in relation to energy acquisition. We investigated the foraging strategy of the jumbo squid Dosidicus gigas when energy demands for growth and reproduction increase as maturation. The analyses are based on the energy density technique to determine energy accumulation and stable isotope analysis to evaluate feeding habits, as well as quantification of the relationship between energy accumulation and isotopic values. We argue that mature female D. gigas may either exclusively feed on high trophic prey items, or increase food intake with opportunistic feeding to meet energy demands. Results indicated that mature female D. gigas varied in energy accumulation between equatorial waters and the north and south of Peru’s Exclusive Economic Zone. Similar results were obtained by analyzing the spatial differences in δ15N and δ13C, and isotopic niches. In contrast, mature D. gigas exhibit a positive relationship between energy accumulation and δ15N, but little evidence for a correlation between energy accumulation and δ13C or chlorophyll a concentration. Cumulatively, our results provide evidence that mature female D. gigas differ spatially in energy accumulation and feeding habits, but have a foraging strategy that increases the intake of higher trophic prey items to meet energy demands for growth and reproduction.

Journal

Aquatic EcologySpringer Journals

Published: Sep 1, 2023

Keywords: Jumbo squid; Energy accumulation; Foraging strategy; Stable isotope; Cephalopod

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