Trophic niche differences between two congeneric goby species: evidence for ontogenetic diet shift and habitat use
| Autor: | Jianfeng Tang, Zhiqiang Guo, Fengyue Zhu, Jiashou Liu, Julien Cucherousset, Sovan Lek, Zhongjie Li |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
0106 biological sciences
Ecology biology Rhinogobius QH301-705.5 010604 marine biology & hydrobiology Ontogeny fungi Niche differentiation Goby Aquatic Science Oceanography biology.organism_classification 010603 evolutionary biology 01 natural sciences Microbiology QR1-502 Habitat Littoral zone Profundal zone 14. Life underwater Biology (General) Ecology Evolution Behavior and Systematics Trophic level |
| Zdroj: | Aquatic Biology, Vol 20, Iss 1, Pp 23-33 (2014) |
| ISSN: | 1864-7790 1864-7782 |
| Popis: | Food partitioning is one of the primary mechanisms facilitating the stable co-occurrence of competing species, but very few studies have investigated how food resource use of competing and closely related species varies with life-history stages and habitats. In Lake Erhai (China), the trophic niche of 2 congeneric and co-occurring invasive goby species (Rhinogobius cliffordpopei and R. giurinus) was examined to test the existence of an ontogenetic diet shift and to determine potential differences in trophic niche between species within a habitat and between habitats (i.e. littoral and profundal) within species. Results obtained from gut content and stable isotope analyses revealed a strong trophic niche shift during ontogeny, whereby juveniles mainly consumed macrozooplankton while sub-adults and adults increasingly consumed aquatic insects and Tubificidae. The trophic niche of juveniles was similar between species in each of the 2 habitats but significantly different for sub-adults and adults, notably in littoral habitat. Moreover, the trophic niche was similar between habitats for juveniles of each species, whereas it differed significantly between habitats for sub-adults and adults. This study demonstrates the importance of ontogeny and shows that habitat use can significantly affect food resource use and trophic relationships between 2 co-occurring fish species. |
| Databáze: | OpenAIRE |
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