Seasonal variability in the feeding ecology of an oceanic predator.

ABSTRACT: Complementary approaches (stomach contents, DNA barcoding, and stable isotopes) were used to examine seasonal shifts in the feeding ecology of an oceanic predator, yellowfin tuna (Thunnus albacares, n = 577), in the northern Gulf of Mexico. DNA barcoding greatly enhanced dietary resolution and seasonally distinct prey assemblages were observed for both sub-adults and adults. In general, diet was characterized by ommastrephid squids and exocoetids in spring, juvenile fishes (i.e., carangids and scombrids) in summer, migratory coastal fishes during fall, and an increased consumption of planktonic prey (e.g., amphipods) in winter. Seasonal variability in bulk stable isotope values (δ¹³C, δ¹⁵N, and δ³⁴S) was also observed, with low δ¹⁵N values and hi

SUBMITTER: Lovell MS 

PROVIDER: S-EPMC11286940 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature