Stable isotope analysis reveals ontogenetic feeding shifts in Pacific blue marlin (Makaira nigricans ) off eastern Taiwan
| Autor: | Michael K. Musyl, Qi-Xuan Chang, Aaron B. Carlisle, Hung-Hung Hsu, Chen-Te Tseng, Yuan-Shing Ho, Wei-Chuan Chiang, Daniel J. Madigan, Yun-Chen Chang, Ching-Tsun Chang, Chi-Lu Sun, Nan-Jay Su |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Food Chain Taiwan Zoology Aquatic Science 010603 evolutionary biology 01 natural sciences Trichiurus lepturus Predation Animals Ecology Evolution Behavior and Systematics Apex predator Isotope analysis Trophic level Carbon Isotopes Coryphaena Pacific Ocean Ecology Nitrogen Isotopes biology 010604 marine biology & hydrobiology Fishes Bayes Theorem biology.organism_classification Mene maculata Forage fish |
| Zdroj: | Journal of Fish Biology. 94:958-965 |
| ISSN: | 0022-1112 |
| DOI: | 10.1111/jfb.13902 |
| Popis: | To gain a better understanding of the trophic ecology of Pacific blue marlin Makaira nigricans off eastern Taiwan, nitrogen and carbon stable isotopes (δ15 N and δ13 C) and Bayesian mixing models were used to explore trophic dynamics and potential ontogenetic feeding shifts across M. nigricans of different size classes. Makaira nigricans samples from east of Taiwan (n = 213) and Palau (n = 37), as well as their prey (n = 70), were collected during 2012 and 2013. Results indicated increases in δ15 N with size, with values of larger size classes (> 200 cm eye-to-fork length; LEF ) significantly higher than those 200 cm LEF had the highest estimated trophic position (4.44) and also exhibited ontogenetic changes in trophic position. Large M. nigricans fed more on dolphinfish Coryphaena hippurus and hairtail Trichiurus lepturus, while smaller M. nigricans consumed smaller forage fish (e.g., moonfish Mene maculata) and cephalopods. These changes may relate to greater swimming speeds and vertical habitat use in larger M. nigricans, allowing capture and consumption of larger prey items at higher trophic positions. The high trophic level of M. nigricans east of Taiwan confirms its important role as an apex predator in marine food webs and how ecological role changes with size. |
| Databáze: | OpenAIRE |
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