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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

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

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  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

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