Detailed whole‐body nutrient analysis identifies differences in feeding ecology between related fish species: The case of Orestias native Andean killifish in Lake Titicaca

Author:

Loayza Erick12ORCID,Muñoz‐Saravia Arturo1,De Troch Marleen3,Hendriks Wouter H.4,Janssens Geert P. J.1ORCID

Affiliation:

1. Department of Veterinary and Biosciences Ghent University Merelbeke Belgium

2. Unidad de Ecología Acuática, Instituto de Ecología, Carrera de Biología‐Facultad de Ciencias Puras y Naturales Universidad Mayor de San Andrés La Paz Bolivia

3. Biology Department, Marine Biology Ghent University Ghent Belgium

4. Animal Nutrition Group Wageningen University Wageningen The Netherlands

Abstract

AbstractBody nutrient profiles in ecological studies allow for relating the nutritional status of consumers and their effects on the movement and retention of elements in ecosystems, as well as reflecting feeding conditions and habitat quality. This study compared the detailed whole‐body nutrient composition (macronutrients, minerals, fatty acids and amino acids) of two omnivorous natives Orestias killifish from Lake Titicaca (Orestias agassizii and Orestias luteus, Valenciennes), the largest lake in the Andes, as an indirect tool to understand differences in their feeding ecology. Although both species are usually described as omnivorous fish, both have amphipods (Hyalella spp) as their main food source. Our results showed that both killifish had a comparable macronutrient composition, and the mineral concentrations of Mg, P and Ca (reflecting bony structures) differed between them. Many of the saturated fatty acids were significantly lower in O. luteus, and O. agassizii had higher concentrations of cis‐vaccenic acid (18:1n11 (cis)), supporting the idea of a higher algal contribution to the diet of this fish. The lower histidine and higher taurine concentrations in O. agassizii compared with O. luteus (independent of body size) may reflect its ubiquitous behaviour and plasticity. This study shows how whole‐body nutrient analysis can identify differences in feeding ecology and feeding behaviour between related species.

Funder

Universiteit Gent

Publisher

Wiley

Subject

Animal Science and Zoology,Food Animals

Reference67 articles.

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2. Food availability as a selective factor on the chemical compositions of midwater fishes in the eastern North Pacific

3. Review of the biology and taxonomy of the genus Orestias Valenciennes 1839 (Actinopterygii, Cyprinodontiformes);De La Barra E.;Hidrobiología Neotropical y Conservación Acuática,2020

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