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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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 dispersal barrier in the tropical Pacific: implications for molluscan speciation and extinction.
Some recent studies suggest that agricultural fields surrounding a woodlot may not be as much of a dispersal barrier for rodents as once was thought (Wegner and Merriam, 1990; Cummings and Vessey, 1994).
In addition, strong color differences were detected suggesting that, despite the size of Australia as a target, 1000 km of open water has presented the anemonefish with a dispersal barrier that is rarely crossed.
The Fall Line is a major dispersal barrier to many reptiles and amphibians of the Coastal Plain.
Presolicitation: Base Notice: Interim Maintenance Of Pulse-Generating Systems At The Chicago Sanitary And Ship Canal Dispersal Barriers -
Such transitions may act as dispersal barriers for Brush Mice to reach oak woodlands common elsewhere in southern Oregon.
In contrast, because butterflies rarely enter large open areas, these habitats may serve as dispersal barriers.