Jeffrey Hutchings, Dalhousie University, Canada holder foredrag om "Correlates of rate and uncertainty of population recovery in marine fishes" i Kaffeklubben på DTU Aqua. Gæster er velkomne.
Resumé
The depletion of fish populations in the 1980s and 1990s stimulated an unprecedented amount of research on recovery. Some of this work addressed long-standing questions of fish population dynamics:
- Does per capita population growth rate (r) always increase as abundance declines?
- Do teleost fishes possess greater intrinsic recovery abilities (as reflected by rmax) than other vertebrates?
- Does magnitude of population reduction affect probability of recovery?
- If fish evolve in response to fishing, changing average fitness and thus rmax, are the population-dynamic consequences likely to be negative, positive, or neutral?
Challenging some perceptions, recent meta-analyses and model simulations on marine teleost fishes indicate that:
- rmax does not differ from that of terrestrial mammals.
- high fecundity has no influence on recovery potential.
- allee effects can be manifest in some depleted populations.
- the greater the depletion, the more uncertain the recovery.
- the effects of fisheries-induced evolution seem unlikely to have a positive influence on fitness.
Om Kaffeklubben
DTU Aquas såkaldte Kaffeklub arrangerer foredrag om akvatisk forskning som en del af den faglige videndeling på instituttet.
Foredragene holdes både af DTU Aquas egne forskere og forskere fra andre danske eller udenlandske forskningsinstitutioner. Tilhørerne er hovedsageligt ansatte i DTU Aqua, men andre interesserede er også velkomne til at deltage. Tilmelding er ikke nødvendig.
Foredragene er på engelsk og varer 1 time, inklusive spørgsmål og diskussion. De afholdes i uformelle rammer på DTU Aqua i Charlottenlund.