Thesaurus: All synonyms and antonyms for allée. if a disaster affected one, it would affect them all) then fragmentation of the population is detrimental to the population and increases extinction risk for the total population. The Allee effect is a phenomenon seen in population biology when a small population grows faster when the organisms are at high population density than it would if the population was at low density. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! A Whereas spatio-temporal models which do not include an Allee effect lead to a vertical pattern of genetic diversity (i.e., a strongly structured spatial distribution of genetic fractions), those including an Allee effect lead to a "horizontal pattern" of genetic diversity (i.e., an absence of genetic differentiation in space). , and The most obvious example of this is observed in animals that hunt for prey or defend against predators as a group. The most current definition of Allee effect considers the correlation between population density and mean individual fitness. The general idea is that for smaller populations, the reproduction and survival rates of individuals increase with population density, although this effect usually disappears as increased intraspecific competition occurs. We find a stochastic Allee effect that is amplified by polygyny. What made you want to look up allée? < The weak Allee effect is a demographic Allee effect without a critical population size or density. The Florida panther experienced a genetic bottleneck in the early 1990s where the population was reduced to ≈25 adult individuals. In this study, to be more precise, we consider μ ( x ) in the form of Smith model [10] : (1.2) μ ( x ) = r K − x K + r c x and A ( x ) = x − m where K is the mass of x ( t ) at saturation, r is … 'All Intensive Purposes' or 'All Intents and Purposes'? The point that I want to make is that the major allele only makes sense when you understand the cohort in which it is the major allele, and also the size of that cohort. Allee effect. "Pollen limitation causes an Allee effect in a wind-pollinated invasive grass (, 10.2193/0022-541X(2004)068[0519:VPRATA]2.0.CO;2, "Rarity Value and Species Extinction: The Anthropogenic Allee Effect", "Genetic restoration of the Florida panther", "Demographic and environmental stochasticity", 10.1093/acprof:oso/9780198525257.003.0001, "Success rate of a biological invasion in terms of the spatial distribution of the founding population", "Allee effect promotes diversity in traveling waves of colonization", Task allocation and partitioning of social insects, Latitudinal gradients in species diversity,, Creative Commons Attribution-ShareAlike License. N Noun Allee effect (uncountable) (ecology) The negative population growth observed at low… This reduction in genetic diversity was correlated with defects that include lower sperm quality, abnormal testosterone levels, cowlicks, and kinked tails. Even very high population sizes can potentially pass through the originally proposed Allee thresholds on predestined paths to extinction. {\displaystyle 0 Holcombe Flowage Resorts, Aglaonema Leaf Spot, Catering Website Template, North Naples Restaurants, 1 Nanometer To Mm, End Of Year Letter To Parents From Teacher, Houses For Rent In Lansing, Mi 48906, Amazon Excel Test, Practical Money Skills Answer Key,