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Insular biogeography [1] or island biogeography is a field within biogeography that examines the factors that affect the species richness and diversification of isolated natural communities. The theory was originally developed to explain the pattern of the species–area relationship occurring in oceanic islands.
Additionally, the low biodiversity of insular ecosystems makes species recognition less important so species-specific coloration is under less selection. [5] As a result, insular bird species often exhibit duller, sexually monomorphic plumage. [5] Several insular species acquire increased melanin colouration.
Garganornis ballmanni, a very large fossil goose from the Gargano and Scontrone islands of the Late Miocene. Foster's rule, also known as the island rule or the island effect, is an ecogeographical rule in evolutionary biology stating that members of a species get smaller or bigger depending on the resources available in the environment.
Island ecology is the study of island organisms and their interactions with each other and the environment. Islands account for nearly 1/6 of earth’s total land area, [1] yet the ecology of island ecosystems is vastly different from that of mainland communities.
In Chapter 5, MacArthur and Wilson examine why species can be excluded from insular environments and how the niche of a species changes after introduction. The authors surmise that pioneering species can be excluded for the following reasons: the island has saturated levels of pre-existing competition, the pioneering species cannot maintain a ...
This category is for the ecology of actual islands, as well as the ecological effects of insular isolation (e.g. may include peninsulas, etc.). See also.
Island gigantism, or insular gigantism, is a biological phenomenon in which the size of an animal species isolated on an island increases dramatically in comparison to its mainland relatives.
The shelf surrounding an island is known as an "insular shelf." The continental margin, between the continental shelf and the abyssal plain, comprises a steep continental slope, surrounded by the flatter continental rise, in which sediment from the continent above cascades down the slope and accumulates as a pile of sediment at the base of the ...