depensation
mortality is depensatory when its rate (i.e. the proportion of population affected) increases as the size of the population decreases. Depensation may explain why marine fish populations like the Atlantic cod are slow to recover even when fishing is halted. Per capita mortality may increase because of changes in predator-prey interactions, mate availability may be reduced, fertilisation success may be lowered, operational sex ratios may change, and there may be a reduced intensity of social interactions during spawning. Compare compensatory mortality where the mortality rate decreases as the population size decreases. Depensation is also called the Allee effect

Dictionary of ichthyology. 2009.

Look at other dictionaries:

  • Depensation — In population dynamics, depensation is the effect on a population (or stock) whereby, due to certain causes, a decrease in the breeding population (mature individuals) leads to reduced survival and production of eggs or offspring. The cause may… …   Wikipedia

  • critical depensation level — level below which a stock or population cannot sustain itself even in the absence of harvest …   Dictionary of ichthyology

  • Especie rara — Saltar a navegación, búsqueda Una especie rara es un organismo que es muy infrecuente o escaso. Esta designación puede aplicarse tanto a taxones de plantas como de animales, y puede ser distinto del término especie en peligro de extinción o de… …   Wikipedia Español

  • Allee effect — the benefit individuals gain from the presence of conspecifics, e.g. at low densities the per capita birth rate declines because of the difficulty of finding a member of the opposite sex. Also known in fisheries as depensation mortality is… …   Dictionary of ichthyology

  • Overexploitation — Atlantic cod stocks were severely overexploited in the 1970s and 1980s, leading to their abrupt collapse in 1992.[1] Overexploitation, also called overharvesting, refers to harvesting a renewable resource to the point of diminishing returns.… …   Wikipedia

  • Carnivore — Carnivorism redirects here. For the diet, see No carbohydrate diet. For other uses, see Carnivore (disambiguation). Lions are voracious carnivores; they require up to seven kilograms (15 lbs) of meat per day. A major component of their diet is… …   Wikipedia

  • Photosynthesis — Composite image showing the global distribution of photosynthesis, including both oceanic phytoplankton and vegetation …   Wikipedia

  • Theoretical ecology — Mathematical models developed in theoretical ecology predict complex food webs are less stable than simple webs.[1]:75–77[2]:64 …   Wikipedia

  • Predation — For alternative meanings of predator and prey, see Predator (disambiguation) and Prey (disambiguation). Predating can also mean dating earlier than : see wiktionary:predate. Indian Python swallowing a small Chital deer at Mudumalai National Park …   Wikipedia

  • Bioaccumulation — refers to the accumulation of substances, such as pesticides, or other organic chemicals in an organism. [1] Bioaccumulation occurs when an organism absorbs a toxic substance at a rate greater than that at which the substance is lost. Thus, the… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”