Positive density-dependence processes occur in macroparasite life cycles that rely on vectors with a cibarial armature, such as Anopheles or Culex mosquitoes. Cambridge, Blackwell Scientific Publ. In overdispersed distributions, a small proportion of hosts harbour most of the parasite population. Facilitation processes cause the reproductive success of the parasite to decrease with lower worm burden. This has been observed in the population dynamics of Schistosomes. The extinction threshold refers to minimum parasite density level for the parasite to persist in a population. At high parasite populations, restriction processes tend to restrict population growth rates and contribute to the stability of these populations. Conversely, in Aedes and Anopheles mosquitoes, which have well-developed cibarial armatures, facilitation processes predominate. This phenomenon contrasts with negative density-dependent predation, as in the positive case the "enemy" is swamped and cannot consume more.
Lesson 3: Population Ecology Exact compensation means that the number of survivors will be constant, or the process itself will compensate for any variation. Thus, 0 means under-compersation, where there are still more births than Over-compensation (with b approaching infinity) occurs when survivorship.
Video: Overcompensation ecology definition Cultural Ecology: Concept, Definition and Relevance
Journal of Animal Ecology exhibit first‐order cycles, resulting from strong overcompensation (i.e. carrying capacity overshoots in peak years.
Density-dependent fecundity exists, where the birth rate falls as competition increases. There also exists density-independent inhibitionwhere other factors such as weather or environmental conditions and disturbances may affect a population's carrying capacity.
The shapes of the k vs B curve is described by its slope bwhich can vary from 0 to infinity. Ecology : Modelling ecosystems : Other components. Animal coloration Antipredator adaptations Camouflage Deimatic behaviour Herbivore adaptations to plant defense Mimicry Plant defense against herbivory Predator avoidance in schooling fish.
A may still be less than B, but this is density-independent.
In these cases, limited availability is a condition for having density-dependent phenomenon of inter-specific competition.
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|In the previous example of bird hatchlings that kept each other warm, later they may suppress weaker siblings, even kick them out of the nest.
Assembly rules Bateman's principle Bioluminescence Ecological collapse Ecological debt Ecological deficit Ecological energetics Ecological indicator Ecological threshold Ecosystem diversity Emergence Extinction debt Kleiber's law Liebig's law of the minimum Marginal value theorem Thorson's rule Xerosere.
In cell biologyit describes the reduction in cell division. Positive density-dependence processes occur in macroparasite life cycles that rely on vectors with a cibarial armature, such as Anopheles or Culex mosquitoes. Thus, control measures that reduce parasite burden will automatically reduce per-capita reproductive success and increase the likelihood of elimination when facilitation processes predominate.
Total Cards Definition overcompensation hypothesis.
Overcompensation in total biomass is possible when different life-history stages The emerging ontogenetic asymmetry in ecological performance and. The general model definition is given and described in detail elsewhere 5, 9, 26, PDF | Plants that overcompensate for herbivory are relatively healthier when damaged.
In this not be confused with the ecological definition.
In order to be certain whether a process is in fact density-dependent, its effects need to be quantified.
Journal of Animal Ecology. Cambridge University Press. At low microfilariae densities, most microfilariae can be ruptured by teeth, preventing successful development of infective L3 larvae.
In the case of the Canadian song sparrow Arcese and Smithfecundity, but not survivorship, of the females was affected by nest density due to decreased food supply per breeding bird. Mathematical Biosciences.
Overcompensation ecology definition
|Density-dependent processes can act across multiple points of the macroparasite life cycle.
4 Types of Density Dependence
Thus, the number of L3 larvae per mosquito declines as the number of ingested microfilariae increases. Because they are independent of the actual value of the vital rates concerned, k-values enable comparisons between different processes, effects and populations. Namespaces Article Talk.