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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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slide1

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

lipid accumulation window hypothesis
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
data sources
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)

slide5

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)

slide6

Zooplankton Species Composition

Jeffreys Ledge

Cfin

2003

2004

2005

2007

slide9

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

slide11

Salinity on Jeffreys Ledge: 2003-2005

2003

2004

2005

S

N

S

N

J

S

N

J

M

M

M

M

M

slide13

“B”

Chlorophyll a standing stock

Jeffreys Ledge

2003

2005

hypothetical metapopulation structure of atlantic cod in the gom ggb system

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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