A new island biogeography of the sea of Cortés by edited by Ted. J. Case, Martin L. Cody, Exequiel Ezcurra

By edited by Ted. J. Case, Martin L. Cody, Exequiel Ezcurra

Background of medical exploration within the Sea of Cortés / George E. Lindsay and Iris Engstrand --
Geology and a long time of the islands / Ana Luisa Carreño and Javier Helenes --
Physical oceanography / Saul Álvarez-Borrego --
Plants / Martin L. Cody ... [et al.] --
Ants / April M. Boulton and Philip S. Ward --
Tenebrionid beetles / Francisco Sanchez Piñero and Rolf L. Aalbu --
Rocky-shore fishes / Donald A. Thomson and Matthew R. Gilligan --
Nonavian reptiles : origins and evolution / Robert W. Murphy and Gustavo Aguirre-Léon --
Reptiles : ecology / Ted J. Case --
Land birds / Martin L. Cody and Enriqueta Velarde --
Breeding dynamics of Heermann's gulls / Enriqueta Velarde and Exequiel Ezcurra --
Mammals / Timothy E. Lawlor ... [et al.] --
Island meals webs / Gary A. Polis ... [et al.] --
Human impression within the Midriff Islands / Conrad J. Bahre and Luis Bourillón --
Cultural dispersal of crops and reptiles / Gary P. Nabhan --
Ecological conservation / Exequiel Ezcurra ... [et al.]

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A new island biogeography of the sea of Cortés

Background of medical exploration within the Sea of Cortés / George E. Lindsay and Iris Engstrand --
Geology and a while of the islands / Ana Luisa Carreño and Javier Helenes --
Physical oceanography / Saul Álvarez-Borrego --
Plants / Martin L. Cody . .. [et al. ] --
Ants / April M. Boulton and Philip S. Ward --
Tenebrionid beetles / Francisco Sanchez Piñero and Rolf L. Aalbu --
Rocky-shore fishes / Donald A. Thomson and Matthew R. Gilligan --
Nonavian reptiles : origins and evolution / Robert W. Murphy and Gustavo Aguirre-Léon --
Reptiles : ecology / Ted J. Case --
Land birds / Martin L. Cody and Enriqueta Velarde --
Breeding dynamics of Heermann's gulls / Enriqueta Velarde and Exequiel Ezcurra --
Mammals / Timothy E. Lawlor . .. [et al. ] --
Island meals webs / Gary A. Polis . .. [et al. ] --
Human impression within the Midriff Islands / Conrad J. Bahre and Luis Bourillón --
Cultural dispersal of crops and reptiles / Gary P. Nabhan --
Ecological conservation / Exequiel Ezcurra . .. [et al. ]

Extra resources for A new island biogeography of the sea of Cortés

Sample text

Rather than being the result of the formation of the Isthmus of Panama or a tectonic event related to the opening of the Gulf of California, this speciation was most probably related to the appearance of peripheral isolates, unrelated to the main populations in the Pacific and in the Caribbean. Speciation in Ostracoda occurs most frequently when populations are isolated in the periphery as a result of climatic changes. However, speciation also occurs in the middle of ranges, when small populations are isolated on island margins by passive mechanisms.

Angel de la Guarda has been related to sea floor spreading during the Pleistocene (Gastil et al. 1983). However, Escalona-Alcazar and Delgado-Argote (1998) point out that even when the structure of the island followed the evolutionary pattern of the Gulf of California after the Pliocene, it contains 18 Ma dacites interfingering with marine sedimentary rocks of a probably middle-to-late Miocene age. Based on seismic reflection images from the bottom of Ballenas Channel, Delgado-Argote et al. (1999) concluded that similar volcanic rocks form part of its walls and bottom.

To the north of Tiburon, marine sedimentary sequences indicate the presence of marine basins as deep as 200 m before 6 Ma in the vicinity of San Felipe (Boehm 1984) and in the Salton Sea area (McDougall et al. 1999). During the late Miocene to Pliocene (8-2 Ma), a marine basin on the northwestern side of the gulf, in the areas near San Felipe and Santa Rosalia, subsided to an approximate depth of 200 m (Carreno 1981, 1982; Boehm 1984). During this interval, the shorelines migrated west from Tiburon, following the escarpment of the rising Sierra San Pedro Martir from Puertecitos in the south, to San Felipe, to the west of the Sierra Cucapas, and to the Salton Trough, California, in the north.

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