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Disturbance-Vicariance Hypothesis

(2007), A test of the vicariance hypothesis of western North American freshwater biogeography

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A hypothesis on Mesozoic vicariance in Hydromedusae

''Reinforcing and expanding the predictions of the disturbance vicariance hypothesis in Amazonian harlequin frogs: a molecular phylogenetic and climate envelope modelling approach.'' , 19, 2125–2146.

Vicariance hypothesis if land bridge isolated populations of an ancestral from BILD 3 at UCSD

Phylogenetic evidence suggested that the Queensland diversified through ‘simultaneous vicariance’, where the range of a widespread ancestral receded to tops of mountains with the Pliocene warming of the continent and subsequent isolation lead to speciation. Implicit in the simultaneous vicariance hypothesis are three postulates on ancestral history: () warm temperatures were effective barriers to ancestral gene flow; () the ancestral had an extensive contiguous distribution; and () there was a single vicariant event associated with Pliocene warming. It is argued that if there was interspecific diversification due to simultaneous vicariance then, within extant species, there are three predictions on current population structure. First, lowland areas, even those connected by streams, would be barriers to contemporary dispersal. Second, there would be contemporary dispersal between catchments covered by mesic rainforests. Third, there would have been recent Pleistocene intraspecific vicariant events. The population structure of , , and was investigated with mtDNA and allozymes and it was found that the intraspecific data were consistent with these predictions. Furthermore, the underwent limited range expansions during the cooler Pleistocene glacial cycles, and it is hypothesised that during cooler glacial periods, lowlands were still effective barriers to dispersal because of increased Pleistocene aridity.

providing support for the simultaneous vicariance hypothesis.

In an attempt to resolve this discordance, we aim to provide a more robust phylogenetic hypothesis and improve divergence-date estimates, which are essential to assessing the null hypothesis of vicariance biogeography.

As an example, the sudden and coincident appearance of hystricognath rodents (Rodentia: Hystricognathi) on both the African and South American continents has been an irreconcilable controversy for evolutionary biologists, presenting enigmas for both Gondwanan vicariance and Late Eocene dispersal hypotheses.

A hypothesis on Mesozoic vicariance inHydromedusae …

AB - Aim: We tested the hypothesis that ancient vicariance in giant water scavenger beetles shaped their current distribution. Location: Worldwide except Antarctica. Methods: We inferred a molecular phylogenetic hypothesis for the tribe Hydrophilini using probabilistic methods based on broad geographical and taxonomic sampling. We used fossil-based molecular dating and likelihood model-based ancestral range estimation to reconstruct the biogeography of this clade. Results: Our results suggest that the tribe originated in the Cretaceous about 120 Ma with a most likely ancestral range in the Gondwanan fragment comprising continental Africa and South America. We infer an ancient vicariance following this early origin, consistent with the split of these two large landmasses in the mid-Cretaceous. The rest of the biogeographical history of the group is shaped by dispersal events throughout the Cenozoic. Main conclusions: The biogeographical history of hydrophiline water beetles is consistent with the hypothesis of West Gondwana vicariance, although an origin in either Africa or South America is a likely alternative. Although the early cladogenesis of this clade might have been shaped by the opening of the Atlantic Ocean, subsequent biogeographical evolution is mainly driven by dispersal events.

N2 - Aim: We tested the hypothesis that ancient vicariance in giant water scavenger beetles shaped their current distribution. Location: Worldwide except Antarctica. Methods: We inferred a molecular phylogenetic hypothesis for the tribe Hydrophilini using probabilistic methods based on broad geographical and taxonomic sampling. We used fossil-based molecular dating and likelihood model-based ancestral range estimation to reconstruct the biogeography of this clade. Results: Our results suggest that the tribe originated in the Cretaceous about 120 Ma with a most likely ancestral range in the Gondwanan fragment comprising continental Africa and South America. We infer an ancient vicariance following this early origin, consistent with the split of these two large landmasses in the mid-Cretaceous. The rest of the biogeographical history of the group is shaped by dispersal events throughout the Cenozoic. Main conclusions: The biogeographical history of hydrophiline water beetles is consistent with the hypothesis of West Gondwana vicariance, although an origin in either Africa or South America is a likely alternative. Although the early cladogenesis of this clade might have been shaped by the opening of the Atlantic Ocean, subsequent biogeographical evolution is mainly driven by dispersal events.

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    Biogeography is limited by ecological factors through the vicariance hypothesis.

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Brazilian Journal of Biology ..

atives was caused by a drift vicariance event that took place when the islands became separated from Yucatan in the Eocene. Greater Antillean cichlids are monophyletic and do not have close South American relatives. Therefore, the alternative hypothesis that these cich-lids migrated via an Oligocene landbridge from South America is falsiWed. A marine dispersal hypothesis is not employed because the drift vicariance hypothesis is better able to explain the biogeographic patterns, both temporal and phylogenetic.

BIOL 427: Chapter 6 Flashcards | Quizlet

Aim: We tested the hypothesis that ancient vicariance in giant water scavenger beetles shaped their current distribution. Location: Worldwide except Antarctica. Methods: We inferred a molecular phylogenetic hypothesis for the tribe Hydrophilini using probabilistic methods based on broad geographical and taxonomic sampling. We used fossil-based molecular dating and likelihood model-based ancestral range estimation to reconstruct the biogeography of this clade. Results: Our results suggest that the tribe originated in the Cretaceous about 120 Ma with a most likely ancestral range in the Gondwanan fragment comprising continental Africa and South America. We infer an ancient vicariance following this early origin, consistent with the split of these two large landmasses in the mid-Cretaceous. The rest of the biogeographical history of the group is shaped by dispersal events throughout the Cenozoic. Main conclusions: The biogeographical history of hydrophiline water beetles is consistent with the hypothesis of West Gondwana vicariance, although an origin in either Africa or South America is a likely alternative. Although the early cladogenesis of this clade might have been shaped by the opening of the Atlantic Ocean, subsequent biogeographical evolution is mainly driven by dispersal events.

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