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Historical biogeography and a priori...

Unmack, Peter John.

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Historical biogeography and a priori hypotheses based on freshwater fishes.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Historical biogeography and a priori hypotheses based on freshwater fishes./
作者:	Unmack, Peter John.
面頁冊數:	369 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3002.
Contained By:	Dissertation Abstracts International66-06B.
標題:	Biology, Zoology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3178278
ISBN:	9780542175954

Historical biogeography and a priori hypotheses based on freshwater fishes.
Unmack, Peter John.

Historical biogeography and a priori hypotheses based on freshwater fishes. - 369 p.

Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3002.

Thesis (Ph.D.)--Arizona State University, 2005.

Freshwater aquatic systems are different biogeographically to other habitat types based on their distribution and connectivity pattern across the landscape. The fundamental unit for defining these systems is the drainage basin or catchment boundary. Because obligate freshwater aquatic organisms are only able to move via direct connections between habitats, drainage basins greatly limit opportunities far movement due to their isolated nature. Potential physical connectivity between drainage basins is largely limited to two factors: changes in sea level, which allow drainages to coalesce when sea level falls; and drainage rearrangements, which result in changed catchment boundaries.

ISBN: 9780542175954Subjects--Topical Terms:

1018632
Biology, Zoology.

Historical biogeography and a priori hypotheses based on freshwater fishes.
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245 1 0 $a Historical biogeography and a priori hypotheses based on freshwater fishes.
300 $a 369 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3002.
500 $a Adviser: Thomas Dowling.
502 $a Thesis (Ph.D.)--Arizona State University, 2005.
520 $a Freshwater aquatic systems are different biogeographically to other habitat types based on their distribution and connectivity pattern across the landscape. The fundamental unit for defining these systems is the drainage basin or catchment boundary. Because obligate freshwater aquatic organisms are only able to move via direct connections between habitats, drainage basins greatly limit opportunities far movement due to their isolated nature. Potential physical connectivity between drainage basins is largely limited to two factors: changes in sea level, which allow drainages to coalesce when sea level falls; and drainage rearrangements, which result in changed catchment boundaries.
520 $a The potential far both factors to influence and generate repeatable biogeographic patterns were a priori mapped across the Australian landscape to test their influence. Three freshwater fish groups were chosen for phylogeographic analysis based on their broad ranges and number of species. The groups were also chosen to maximize geographic overlap among taxa and provide maximum coverage of Australia.
520 $a When fish groups were combined, they showed little congruence in their patterns of divergence across Australia despite a high degree of co-occurrence. This suggests that shared biogeographic history within and among each group has been limited, and different biogeographic factors must be invoked to explain the observed patterns in each group. Two factors are proposed to explain this result. The first is that dispersal across freshwater biogeographic barriers may be more common than previously thought. This is due to the presence of low drainage divides which may allow fishes to move across catchment boundaries during high rainfall periods without drainage rearrangement. The second is that vicariance in freshwater systems does not appear to be a powerful structuring force. Although vicariant events are occurring on a regular basis, the fish fauna may not be equally affected by these events due to differences in ecology and climate.
520 $a Over-arching biogeographic hypotheses are inadequate to explain the independent histories of each group. Thus, patterns within each group require individual explanations. My research adds to the growing body of literature that suggests independent biogeographic patterns are common. Hence, finding broader explanations for patterns may be the exception rather than the rule.
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792 $a 2005
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