期刊
MARINE BIOLOGY RESEARCH
卷 15, 期 1, 页码 97-112出版社
TAYLOR & FRANCIS AS
DOI: 10.1080/17451000.2019.1578377
关键词
Haakon Hop; Billfish; fin spines; muscle; isotopic niche; mixing model
资金
- Consejo Nacional de Ciencia y Tecnologia
- BEIFI-IPN (Beca de Estimulo Institucional de Formacion de Investigadores) fellowship
- COFAA-IPN (Comision de Operacion y Fomento de Actividades Academicas) fellowship
Isotopic niche and resource partitioning were examined between striped marlin (Kajikia audax) and swordfish (Xiphias gladius) using stable isotope ratios from spine bone and muscle samples. The C-13 (C-13/C-12) and N-15 (N-15/N-14) values were measured in annual growth bands from fin spines and muscle collected from striped marlin and swordfish off Baja California Sur to evaluate the trophic interaction between these two species, the relative contribution of the main prey and the isotopic niche within two different timescales. Mean trophic level (TL) values were different when tissues were compared with the highest value found in muscle samples from K. audax. When TL was analysed in all growth bands for both species, no changes were detected throughout time, suggesting only minor differences in feeding habits between these species. We determined that Dosidicus gigas, Sthenoteuthis oualaniensis, and Ancistrocheirus lesueurii were the most important prey for both species, but the relative contribution of each of them to the diet differed. There is likely no trophic overlap between K. audax and X. gladius off Baja California Sur, as K. audax occupied a larger isotopic niche with more diverse prey than X. gladius.
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