Program and Agenda

Abstract

CLIMATE-INDUCED VARIABILITY IN CALANUS SPP. DEVELOPMENT AND SPAWNING IN THE EASTERN BERING SEA

The eastern Bering Sea shelf experienced a sequence of shifts between warm and cold conditions during the last decades, which were accompanied by rises and declines in large zooplankton populations, especially pronounced in the southeastern middle shelf domain. These fluctuations in abundance are likely attributed to organismal responses to the changing environment. We hypothesized that increased developmental rates of large copepod Calanus during warm years result in multiple cohorts on the southeastern shelf, while the Calanus population in the north is not exposed to substantial interannual temperature changes and has only one generation per year. To test this hypothesis we used satellite SSTs to identify regions with similar temperature regimes; then we determined snap-shot stage-specific distributions using field data from FOCI, BASIS and the BEST-BSIERP programs to reconstruct Calanus life cycles using the concept of physiological time. The results indicate that Calanus have multiple generations in the southeastern Bering Sea during warm years, but does not result in elevated abundances, suggesting that other factors are responsible for the population control.

ePoster:

Authors

Pinchuk, A. I., University of Alaska, USA, aipinchuk@alaska.edu

Coyle, K. O., University of Alaska, USA, kocoyle@alaska.edu

Eisner, L. B., NOAA, USA, Lisa.Eisner@noaa.gov

Napp, J. M., NOAA, USA, Jeff.Napp@noaa.gov

Details

Poster presentation

Session #:088
Date: 2/24/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: 1135