P1253297511yoZJE - PowerPoint PPT Presentation

Title: P1253297511yoZJE


1
Growth and reproductive rates of crustaceans in
the Gulf of Alaska R.R. Hopcroft, A.G. Byrd, C.
Clarke, H. Liu, A.I. Pinchuk, L.M. Slater
Institute of Marine Science, University of
Alaska Fairbanks

• Goals
• Establish the rates of growth and reproduction of
  the dominant copepods and euphausiids encountered
  on each LTOP cruise.
• Use these rates in conjunction with abundance and
  biomass data on LTOP cruises to determine the
  accompanying rates of secondary production,
  including their cross-shelf, seasonal, and
  inter-annual patterns.
• Establish the relationships to the underlying
  factors modulating these rates (i.e. temperature
  and food)
• Approach overview
• Experiments for copepods have been concentrated
  at Stations Gak1, 4, 9, 13 and PWS2 or KIP2
  (Figure 1). Euphausiid experiments have occurred
  at stations where abundances were high. In the
  case of the copepods Neocalanus flemingeri and
  Centropages abdominalis, plus the euphausiids
  Thysanoessa inermis and Euphausia pacifica,
  growth and development rates have also been
  determined in the laboratory.
• Dataset
• Number of Copepod Reproduction Experiments Num
  ber of Copepod Somatic Growth Experiments
• Number of euphausiid molting rate
  experiments

2001 2002 2003 2004 Total
Pseudocalanus spp 17 29 28 12 86
Metridia pacifica 7 31 27 16 81
Acartia longiremis 9 8 14 6 37
Calanus marshallae 1 3 7 9 20
Eucalanus bungii 4 3 3 6 16
Calanus pacificus 1 3 9 2 15
Metridia okhotensis 5 5 5 0 15
Centropages abdominalis 6 1 4 2 13
Mesocalanus tenuicornis 2 2 2 1 7
Paracalanus parvus 0 0 6 0 6
Epilabidocera longipedata 0 1 3 0 4
Gaetanus intermedius 1 1 0 0 2
Grand Total 302
Note egg production for Oithona similis calculated from gt200 samples Note egg production for Oithona similis calculated from gt200 samples Note egg production for Oithona similis calculated from gt200 samples Note egg production for Oithona similis calculated from gt200 samples Note egg production for Oithona similis calculated from gt200 samples Note egg production for Oithona similis calculated from gt200 samples
2001 2002 2003 2004 Total
Mixture of species 9 14 11 6 40
2001 2002 2003 2004 Total
Mixture of species 23 30 30 15 98
All data adjusted to 5C