caa a22 4500 469074566 CHVBK 20180323132931.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF00129707 doi (NATIONALLICENCE)springer-10.1007/BF00129707 Interception of moving organisms: influences of patch shape, size, and orientation on community structure [Elektronische Daten] [Kevin Gutzwiller, Stanley Anderson] Island biogeographers have predicted that in oceanic systems, oblong islands oriented perpendicular to the dispersal paths of organisms should intercept more species and individuals than (1) circular islands of the same size, and (2) oblong islands of equal area oriented parallel to the direction of travel. Landscape ecologists expect similar relations with habitat patches in a terrestrial matrix. Yet in neither situation is there adequate empirical information to permit conclusions about the prevalence of such effects. To test the hypothesis that intercept-related patch variables influence community structure on the landscape scale, we studied relations between the richness and abundance of cavity-nesting birds and patch shape, size, and orientation relative to a northerly migration path. The influences of other patch features on nest abundances were removed analytically. Multiple regression indicated that the mean and total number of nesting species, and nest abundances for migrants were significantly associated with patch orientation or a patch area x orientation interaction, but not patch shape. Nest abundances for permanent residents were not associated with patch shape or orientation, although area effects, possibly reflecting dispersal interception, were evident. These results are consistent with the hypothesis that stochastic interception of migrating or dispersing organisms influences patch community structure. In addition to richness and abundance effects apparent in this analysis, the sex ratio, age structure, growth rate, social structure, and genetic features of patch populations may also be influenced. The interception of moving organisms by patches may thus be a key factor influencing population and community persistence in reserves. If so, landscape structure could be manipulated to maximize the interception of dispersing or migrating organisms, or minimize it if the effects are undesirable. SPB Academic Publishing bv, 1992 abundance nationallicence interception nationallicence nesting birds nationallicence patch orientation nationallicence richness nationallicence terrestrial matrix nationallicence Gutzwiller Kevin Wyoming Cooperative Fish and Wildlife Research Unit, University of Wyoming, 82071, Laramie, WY, USA aut Anderson Stanley Wyoming Cooperative Fish and Wildlife Research Unit, University of Wyoming, 82071, Laramie, WY, USA aut Landscape Ecology Kluwer Academic Publishers 6/4(1992-03-01), 293-303 0921-2973 6:4<293 1992 6 10980 https://doi.org/10.1007/BF00129707 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00129707 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gutzwiller Kevin Wyoming Cooperative Fish and Wildlife Research Unit, University of Wyoming, 82071, Laramie, WY, USA aut NATIONALLICENCE 700 1- Anderson Stanley Wyoming Cooperative Fish and Wildlife Research Unit, University of Wyoming, 82071, Laramie, WY, USA aut NATIONALLICENCE 773 0- Landscape Ecology Kluwer Academic Publishers 6/4(1992-03-01), 293-303 0921-2973 6:4<293 1992 6 10980 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer