dispersal barrier

dispersal barrier

[də′spər·səl ‚bar·ē·ər]
(ecology)
A physical structure that prevents organisms from crossing into new space.
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References in periodicals archive ?
Aquatic communities in aridland streams are often separated by harsh intervening terrain that can act as a dispersal barrier.
Later chapters cover topics such as alternative methods for snail control in aquaculture ponds, a heuristic tool for predicting dispersal of bighead carp in the Mississippi River system, an electric fish dispersal barrier in the Chicago Sanitary and Ship Canal, and a theoretical strategy for eradication of Asian carp using a Trojan Y chromosome to shift the sex ratio of the population.
Also, the relatively high elevation of the Appalachians would have been an additional dispersal barrier to the low-elevation adapted mammals of Florida.
Additional work on dispersal barrier technologies has been conducted on the Champlain Canal, which is the probable point of entry to Lake Champlain for 50 percent of nuisance species, including the sea lamprey, the zebra mussel, the white perch, and the water chestnut.
The nutrient-poor, acidic substrates in the extensive stretches of white sands on the eastern slope of the Andes in this region are an effective dispersal barrier for Nasa (which is restricted to more or less fertile soils), facilitating allopatric speciation.
The Huancabamba Depression itself has not acted as a major dispersal barrier and does not mark the distribution limits of northern and southern groups.
Fish and Wildlife Service and other personnel will be on-hand to assist the media and answer any questions about the round goby and dispersal barrier.
In contrast, because butterflies rarely enter large open areas, these habitats may serve as dispersal barriers.
Experts disagree on whether the multimillion-dollar electric dispersal barriers now being constructed on the canal will succeed, and some authorities have argued that only permanently disconnecting the canal will protect Lake Michigan.
The low frequency and species number of forest ground ants indicates that oil palm plantations act as effective dispersal barriers leading to community isolation in rain forest remnants.
Chicago Sanitary and Ship Canal Dispersal Barriers on the Illinois Waterway: The Budget proposes the authorization of improvements to the existing demonstration project barrier, and of additional funding authority to complete a second electric barrier.
The evolutionary isolation imposed by the dispersal barriers of ocean, desert, and mountains has resulted in a high degree of exclusivity.