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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Migratory dynarmcs and dietary change of sooty shearwaters Puffinus griseus sampled in the North Pac~fic from May to September in 1990 and 1991 were investigated using the method of 613C and 615N analyses 613C and 615N values of muscle tissues of shearwaters ranged from -21.9 to -15.1%0 and from 8.1 to l6.6%0, respectively. The 6I5N values of immature shearwaters collected east of longitude 170" W differed from those west of this longitude. In the northwestern Pacific. 6I3C and 615N of both mature and immature birds were lowest in May (both mature and immature: 613C -20.7 0.9%0, 615N 8.8 * 1.074,; mean * SD) and then gradually increased until early summer. In contrast, no seasonal variations in 613c and 6 1 5 ~ of mature birds were observed in the northeastern Pacific and 613C and 6I5N of immature birds in the northeastern area were the highest In May (6I3C -15.9 * 0.5%0. 6I5N 15.9 t 0 8Ym; mean + SD), and then gradually declined. We attribute these isotopic trends pnmanly to differences in the lsotopic signatures of food-web components due to oceanographic factors, and the influence of sooty shearwater rmgrations. Low or high 6I3C and 615N values of immature and mature shearwaters in the western and eastern North Pacific in ~ V a y may be caused by the transient effects of food consumed in the Southern Hemisphere before or during the northward migration In particular, the high 615N of the immature birds in the northeastern area seems to be caused by feeding on 15N rich diets in the eastern tropical Pacific, off Peru and California, during the northward migration, where occurrence of denitrificatlon with a high nitrogen isotope fractionation factor of up to 1.04 is well known. The pattern of the mgratory behaviour of sooty shearwaters m the Pacific Ocean was successfully clarified by their isotopic signature.

Determination of migratory dynamics of the sooty shearwater in the Pacific using stable carbon and nitrogen isotope analysis