By Robin C. Craw, John R. Grehan, Michael J. Heads

Biogeography is a various topic, usually targeting the distribution of crops and animals at diverse taxonomic degrees, prior and current. sleek biogeography additionally places emphasis at the ecological personality of the realm plants forms, and at the evolving courting among people and their surroundings. Panbiogeography describes a brand new synthesis of sciences of plant and animal distribution. The e-book emphasizes that the geographical styles of animal and plant distribution give a contribution on to the knowledge and interpretation of evolutionary historical past. Geographic position is reintroduced as a serious component of either biogeography and evolutionary biology. The authors current chapters exploring the jobs of geology, ecology, evolution in panbiogeographic concept, and introduce new tools, modes of category, and methods of measuring biodiversity.

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But such an approach is vulnerable to the trend toward discovery of ever older fossils referable to extant groups. For example, recent fossil discoveries have extended by many millions of years the known geological time range of hagfish and pseudoscorpions. , 1989), while the fossil hagfish is about 300 million years old and is the first reported fossil for this group (Bardack 1991). Many other extant groups are also ancient. Family differentiation of modern freshwater Mollusca had taken place by the late Paleozoic, for many well-preserved fossils from this period are readily assignable to living families or even subfamilies, and some extant genera can be recognized by early Cretaceous times (Taylor 1988).

The interisland tracks may also connect with certain parts of the mainland and not others, despite the presence of suitable habitat throughout the mainland. With plate tectonic movement, original geologic formations may be removed and accreted or subducted elsewhere, so that former insular distributions can become continental through island arc accretion to mainland areas. Tyler (1979) correlated frog distributions in New Guinea with island arc accretion, and Van Welzen et al. (1992) related collision and docking events involving numerous island arc terranes in northern New Guinea to the diffusion and vicariant differentiation of ancestors to the modern biota.

2-8a). Geological evidence supports contiguity of drainage patterns prior to tectonic displacement (Minckley et al. 1986). Similarly, Axelrod (1986 related disjunct distributions of closely related coastal pines of California and Mexico to northward translocation along the San Andreas rift system (fig. 2-8b). Murphy (1975,1983a,b) suggested that the distribution of Baja California reptiles and isolation of endemic taxa on small islands in the Gulf of Mexico was correlated with fragmentation of their ancestral populations by formation of the gulf through these tectonic movements.

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