Impact of prey field variability on early cod larval survival: a sensitivity study of a Baltic cod Individual-based Model

• Autorzy: Schmidt J.O. , Hinrichsen H.-H.
• Języki publikacji: EN

Abstrakty

EN

Existing coupled biophysical models for Baltic larval cod drift, growth and survival use idealised constructed mean prey fields of nauplius distributions. These simulations revealed the best feeding conditions for Baltic cod larvae longer than 6 mm. For shorter, first feeding larvae (between 4.5 and 6 mm) pronounced differences in growth and survival were observed, which depend on food availability and to a lesser degree on ambient temperature. We performed runs with an Individual-based Model (IBM) for Baltic cod larvae in order to demonstrate how natural variability in prey abundance influences the survival success of first feeding larvae. In the Baltic, this larval stage lives mainly between 20 and 40 m depth and feeds exclusively on the nauplii of different calanoid copepods (Acartia spp., Pseudocalanus acuspes, Temora longicornis and Centropages hamatus). Prey data obtained from vertically stratified samples in the Bornholm Basin (Baltic Sea) in 2001 and 2002 indicate a strong variability at spatial and temporal scales. We calculated larval survival and growth in relation to natural variation of prey fields, i.e. species-specific nauplius abundance. The results of the model runs yielded larval survival rates from 60 to 100% if the mean size of nauplii species was taken and lower survival if prey consisted of early nauplius stages only.

Słowa kluczowe

EN

Baltic Sea; individual-based model; calanoid copepod; Acartia; larva; Temora longicornis; predator-prey interaction; spatial variation; biophysical model; Centropages hamatus; cod; Pseudocalanus acuspes; Baltic cod

• Wydawca: -
• Czasopismo: Oceanologia
• Rocznik: 2008
• Tom: 50
• Numer: 2
• Opis fizyczny: p.205-220,fig.,ref.

Twórcy

autor

Schmidt J.O.

• University of Kiel [IFM-GEOMAR], Dusternbrooker Weg 20, D-24105 Kiel, Germany

autor

Hinrichsen H.-H.