By W. T. Adams, S. H. Strauss, D. L. Copes, A. R. Griffin (auth.), W. T. Adams, Steven H. Strauss, Donald L. Copes, A. R. Griffin (eds.)
Tropical climates, which take place among 23°30'N and S range (Jacob 1988), surround a large choice of plant groups (Hartshorn 1983, 1988), a lot of that are different of their woody floras. inside of this geographic area, temperature and the volume and seasonality of rainfall outline habitat varieties (UNESCO 1978). The F AO has expected that there 1 are approximately 19 million km of doubtless forested zone within the international tropics, of which fifty eight% have been envisioned to nonetheless be in closed wooded area within the mid-1970s (Sommers 1976; UNESCO 1978). Of this almost certainly forested quarter, forty two% is labeled as dry woodland lifezone, 33% is tropical wet wooded area, and 25% is rainy or rain woodland (Lugo 1988). The species range of those tropical habitats is especially excessive. Raven (1976, in Mooney 1988) expected that sixty five% of the 250,000 or extra plant species of the earth are present in tropical areas. Of this floristic assemblage, a wide fraction are woody species. within the well-collected tropical wet wooded area of Barro Colorado Island, Panama, 39. 7% (481 of 1212 species) of the local phanerogams are woody, arborescent species (Croat 1978). one other 21. nine% are woody vines and lianas. Southeast Asian Dipterocarp forests may perhaps include 120-200 species of bushes consistent with hectare (Whitmore 1984), and up to date surveys in top Amazonia re corded from 89 to 283 woody species ~ 10 cm dbh in keeping with hectare (Gentry 1988). Tropical groups hence characterize an international woody vegetation of important scope.
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Extra resources for Population Genetics of Forest Trees: Proceedings of the International Symposium on Population Genetics of Forest Trees Corvallis, Oregon, U.S.A., July 31–August 2,1990
3 Compsetal. 5 H (%) G ST (%) Main conclusion about intra- and/or interpopulational genetic variation Castanea sativa Mill. Differentiation between north. and south. pop. (Italy) Little intrapop. variation; clinal variation suggested (Italy) Fagus sylvatica L. 0 Kim 1980. 1985 2 Merzeau et al. 4 Differentiation between continental and Mediterr. 2 Differentiation between low- and highland pop. (Croatia) Differentiation among geographical groups of pop. 21') Great intra- and interpop. variation (Germany.
Northeast. 0 Small interpopul. 0 Small interpopul. variation among populations (Sweden) Muona et al. 0 19 40' 6 Tigerstedt 1973 2 45' 4 Tigerstedt 1979 10 18-107' 6 Stutz 1990 Indiv. per pop. No. of loci AL H (%) G ST (%) Main conclusions about intra- and/or interpopulational genetic variation Distinct differentiation between pop. 2 Interpop. variation between indigenous and artifical pop. (South. 5 Minor polymorphism; small interpop. variation (north. 0('1 ReI. great intra pop. variation and clear differentiation between pop.
Causes for heterogeneity in intra- and interpopulational variation as inferred from enzyme gene markers Specific features of tree species European forest tree species can be classified as follows: (a) Species with large geographic ranges such as Picea abies, Pinus sylvestris or Fagus sylvatica tend to show little genetic differentiation among populations within regions, but greater differentiation among populations derived from different glacial refugia (continuous species). 32 Table 2. Survey of genetic variation in European conifers based on isoenzymes No.
Population Genetics of Forest Trees: Proceedings of the International Symposium on Population Genetics of Forest Trees Corvallis, Oregon, U.S.A., July 31–August 2,1990 by W. T. Adams, S. H. Strauss, D. L. Copes, A. R. Griffin (auth.), W. T. Adams, Steven H. Strauss, Donald L. Copes, A. R. Griffin (eds.)