Geography and dispersal of Galapagos Islands vascular plants

Porter, Duncan M.

doi:10.1038/264745a0

Cited by 55 publications

(57 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Circumstantial evidence indicated the occurrence of both guntheri and vicina in Cinco Cerros, a southeastern Cerro Azul location characterized by a more mesic vegetation than other lowland localities (Porter 1976). …”

Section: Discussionmentioning

confidence: 99%

Phylogeographic History and Gene Flow Among Giant Galápagos Tortoises on Southern Isabela Island

et al. 2006

View full text Add to dashboard Cite

Volcanic islands represent excellent models with which to study the effect of vicariance on colonization and dispersal, particularly when the evolution of genetic diversity mirrors the sequence of geological events that led to island formation. Phylogeographic inference, however, can be particularly challenging for recent dispersal events within islands, where the antagonistic effects of land bridge formation and vicariance can affect movements of organisms with limited dispersal ability. We investigated levels of genetic divergence and recovered signatures of dispersal events for 631 Galápagos giant tortoises across the volcanoes of Sierra Negra and Cerro Azul on the island of Isabela. These volcanoes are among the most recent formations in the Galápagos (,0.7 million years), and previous studies based on genetic and morphological data could not recover a consistent pattern of lineage sorting. We integrated nested clade analysis of mitochondrial DNA control region sequences, to infer historical patterns of colonization, and a novel Bayesian multilocus genotyping method for recovering evidence of recent migration across volcanoes using eleven microsatellite loci. These genetic studies illuminate taxonomic distinctions as well as provide guidance to possible repatriation programs aimed at countering the rapid population declines of these spectacular animals.

show abstract

Section: Discussionmentioning

confidence: 99%

Phylogeographic History and Gene Flow Among Giant Galápagos Tortoises on Southern Isabela Island

et al. 2006

View full text Add to dashboard Cite

show abstract

“…Many organisms, including several types of invertebrates (snails, arthropods) and vertebrates (lizards, snakes, and even poor-fl ying birds like rails), may have reached the islands on those masses of vegetation that usually get to the ocean when continental rivers over fl ow during the rainy season and then drift into the open ocean. Duncan Porter ( 1976 ) inferred the mean of transportation for the 378 indigenous ancestral taxa that colonized the Galapagos and suggests that birds may have been the vector for about 60% (of these, 64% in the digestive tract, 21% attached to feathers, and 15% attached to mud on the legs), while 32% were transported by the wind and 9% by the sea.…”

Section: Arrival Of Organisms To the Archipelagomentioning

confidence: 99%

Science and Conservation in the Galapagos Islands

Valle

2012

Social and Ecological Interactions in the Galapagos Islands

View full text Add to dashboard Cite

“…This isolation has, presumably, also allowed for movements between islands. Although numerous studies have been conducted on the origins and long-distance dispersal of the Galapagos biota (Porter, 1976(Porter, , 1983(Porter, , 1984a, until recently (Wright, 1983;Wyles and Sarich, 1983) only qualitative conjectures have been made on the relative importance of inter-island colonization. The most notable exception is the research by Hamill and Wright (1988).…”

Section: Inter-island Species Movements In the Galapagos Islandsmentioning

confidence: 99%

“…Birds are considered to be the most important natural dispersal vector for the initial colonization of plants on the Galapagos Islands (Porter, 1976). There is considerable debate, however, over the relative importance of birds, ocean currents, and wind for interisland dispersal (see Porter, 1976Porter, ,1983Porter, ,1984aCarlquist, 1974).…”

Section: The Effect Of the Humboldt Current On Colonizationmentioning

confidence: 99%

Spatial patterns of inter‐island plant and bird species movements in the Galápagos Islands

Harvey

1994

Journal of the Royal Society of New Zealand

View full text Add to dashboard Cite

An asymmetric similarity index, defined as the proportion of species that one island has in common with a second, was introduced to infer inter-island colonization patterns from species lists. The matrix comparison or Mantel test was used to analyze the index for spatial patterns of species composition. Directional inter-island colonization was inferred from the skew-symmetric component of the index. Four biogeographical hypotheses were tested for the inter-island colonization of plants among 17 Galapagos islands and among 15 islands for birds. Plant and bird species composition and their inter-island colonization patterns are distance-dependent. More specifically, species density gradients are a function of the configuration of islands in the archipelago. The net direction of bird and plant density gradients for the archipelago increases from the south. Plant density gradients are significantly correlated with the prevailing northwest flow of the Humboldt Current, but bird density gradients are uncorrelated with the Humboldt Current or with the gradients of plant species. These results corroborate the most popular model of colonization for the Galapagos Archipelago: an initial colonization of islands in the southeast, and subsequent colonization of islands to the north and northwest.

show abstract

Geography and dispersal of Galapagos Islands vascular plants

Cited by 55 publications

References 11 publications

Phylogeographic History and Gene Flow Among Giant Galápagos Tortoises on Southern Isabela Island

Phylogeographic History and Gene Flow Among Giant Galápagos Tortoises on Southern Isabela Island

Science and Conservation in the Galapagos Islands

Spatial patterns of inter‐island plant and bird species movements in the Galápagos Islands

Contact Info

Product

Resources

About