English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Comparative analysis of isotope values from different tissues can capture temporal variation in the trophic and foraging behavior of difficult to study large marine predators, reveal- ing either uniform or variable ecological roles over time. The isotopic values (δ 13 C and δ 15 N) of dermis, and muscle tissue of silky Carcharhinus falciformis and blue sharks Prionace glauca sam- pled in the northeast central Pacific were analyzed to quantify ontogenetic inter- and intra-tissue isotopic variation. Consistent differences in δ 15 N values occurred between dermis and muscle tis- sue for both species (2.5 ± 0.4 ‰ and 2.1 ± 0.3 ‰, respectively), while tissue differences in δ 13 C values were more variable between species (2.3 ± 0.6 ‰ and 0.7 ± 0.6 ‰, respectively), likely a result of tissue composition. The overall δ 15 N and δ 13 C values of dermis and muscle were highly correlated for blue sharks and for silky sharks with the exception of silky shark δ 13 C values. This pattern indicates that dermis isotope values are able to provide a proxy for muscle tissue, similar to that previously reported for fin, accepting dermis-specific diettissue discrimination factors. Tissue-specific ontogenetic isotopic variation for the silky shark, and the low regression slope value between dermis and muscle δ 13 C values, however, may suggest that dermis and muscle tissue have different isotopic turnover rates. These data demonstrate that dermis yields valuable isotope data to examine the trophic ecology and feeding/movement behavior of sharks, but further work is required to address dermis-specific turnover rates and diettissue discrimination factors.

Quantifying ontogenetic stable isotope variation between dermis and muscle tissue of two pelagic sharks