TY - JOUR
T1 - Trophic interaction between striped marlin and swordfish using different timescales in waters around Baja California Sur, Mexico
AU - Acosta-Pachón, Tatiana A.
AU - Ortega-García, Sofía
N1 - Publisher Copyright:
© 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2019/1/2
Y1 - 2019/1/2
N2 - 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 δ13C (13C/12C) and δ15N (15N/14N) 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.
AB - 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 δ13C (13C/12C) and δ15N (15N/14N) 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.
KW - Billfish
KW - Haakon Hop
KW - fin spines
KW - isotopic niche
KW - mixing model
KW - muscle
UR - http://www.scopus.com/inward/record.url?scp=85065712204&partnerID=8YFLogxK
U2 - 10.1080/17451000.2019.1578377
DO - 10.1080/17451000.2019.1578377
M3 - Artículo
AN - SCOPUS:85065712204
SN - 1745-1000
VL - 15
SP - 97
EP - 112
JO - Marine Biology Research
JF - Marine Biology Research
IS - 1
ER -