1 / 14

J.A. Runge, A. Leising, C. Johnson

Effects of climate variability on Calanus dormancy patterns and population dynamics in the Northwest Atlantic. Mechanistic explanation of dormancy in species of Calanus Development of Calanus life cycle model

Télécharger la présentation

J.A. Runge, A. Leising, C. Johnson

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Effects of climate variability on Calanus dormancy patterns and population dynamics in the Northwest Atlantic • Mechanistic explanation of dormancy in species of Calanus • Development of Calanus life cycle model • Evaluate how year-to-year variability in environmental conditions interacts with dormancy-control mechanisms to control Calanuspopulation dynamics. J.A. Runge, A. Leising, C. Johnson

  2. Lipid accumulation window hypothesis • Individual Calanus can only enter diapause if their food and temperature history allows them to accumulate sufficient lipid for overwintering and gonad development • Decision to proceed to dormancy is initiated when lipid stores reach a preset threshold (% by weight in stage CIV) • Exit from dormancy by endogenous timer or when lipid stores decrease below a preset threshold

  3. Life cycle model with lipid diapause rule:comparison with observations

  4. Data sources Data from: DFO – AZMP: 1999 – 2005 (E.Head, P.Pepin) DFO – IML:1990 – 1991 (S. Plourde, P. Joly) US-GLOBEC: 1995 – 1999 (E. Durbin, M. Casas) PULSE – NEC: 2003 – 2005 (R. Jones)

  5. Western Gulf of Maine fixed station sampling: 2003-2007 UNH COOA (Center for Coastal Ocean Observation and Analysis) (triangles) and Northeast Consortium PULSE fixed stations, (red circles: 2003-05 and 2007)

  6. Zooplankton Species Composition Jeffreys Ledge Cfin 2003 2004 2005 2007

  7. A decline in the abundance of Calanus finmarchicus in 2004-2005 J F M A M J J A S O N D

  8. Abundance of Calanus finmarchicus Total CV

  9. Northwest Atlantic Marine Alliance (NAMA)-UNH Western Gulf of Maine Inshore Fisheries and Ecosystems Project Cod May June NH summer Oct-Dec Adults Herring Spawning Cape Ann Cartographer: A. Holt Cline

  10. Salinity on Jeffreys Ledge: 2003-2005 2003 2004 2005 S N S N J S N J M M M M M

  11. “B” Chlorophyll a standing stock Jeffreys Ledge 2003 2005

  12. Hypothetical metapopulation structure of Atlantic Cod in the GoM/GGB system Based on Wirgin et al. 2007; A. Kovach, UNH, G. Sherwood and S. Tallack, GMRI

More Related