Ontogenetic changes in the feeding strategy of Lepidonotothen nudifrons (Pisces, Nototheniidae) off the South Shetland Islands and the Antarctic Peninsula

Polar research

Juan Martín Díaz de Astarloa¹  Andrea Lopez Cazorla²  Daniel Bruno³  Matías Delpiani⁴  Gabriela Blasina⁶  Mariana Deli Antoni⁶ 

[1] Grupo de Biotaxonomía Morfológica y Molecular de Peces, /Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, ArgentinaView further author information;Instituto Argentino de Oceanografía, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)/Universidad Nacional del Su (UNS), Bahía Blanca, ArgentinaCorrespondence;Instituto Argentino de Oceanografía, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)/Universidad Nacional del Su (UNS), Bahía Blanca, ArgentinaView further author information;Instituto de Investigaciones Marinas y Costeras, Consejo Nacional de Investigaciones Científicas y Técnica (CONICET)/Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, Argentina;Laboratorio de Ecología, Fisiología y Evolución de Organismos Acuáticos, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ushuaia, ArgentinaView further author information;Laboratorio de Vertebrados, Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur (UNS), Bahía Blanca, Argentina

关键词: Antarctic fish diet;    zone-related changes;    dominant prey;    feeding strategy;    trophic level;    food web;    ANOVA: one-way analysis of variance test;    AP: Antarctic Peninsula;    NP-MANOVA: non-parametric permutation multivariate analysis of variance;    SSI: South Shetland Islands;    TR: trophic level;   

DOI  :  10.1080/17518369.2017.1331558

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

ABSTRACTThe diet and feeding strategy of Lepidonotothen nudifrons off the South Shetland Islands and the Antarctic Peninsula, as well as their variation in relation to ontogenetic stage (juvenile–adult) and sampling area, were determined by stomach contents analysis. Additionally, the trophic level of this species was estimated to determine its position within the Antarctic food web. Out of 247 specimens with prey in their stomachs, 144 were caught near the South Shetland Islands and 103 off the Antarctic Peninsula. Ontogenetic changes in the trophic ecology of L. nudifrons were observed in both areas and were mainly related to a decrease of copepods and an increase of euphausiids in the diet. The diet of juveniles from the South Shetland Islands was characterized by the dominance of calanoid copepods, followed by isopods and amphipods, whereas diet off the Antarctic Peninsula was dominated by amphipods and cyclopoid copepods. The diet in adults was dominated by amphipods and euphausiids in both areas. Th...

【 授权许可】

CC BY-NC