...We have not found tadpoles of two species of Smilisca in the same bodyof water and therefore cannot offer observations on ecological relationships insympatric situations...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...An ecological analysis of the interbreeding of Crested Titmice in Texas...
Emil K. Urban 「Birds from Coahuila, Mexico」
...Grinnell (1933:54) characterizes the ecological nicheof the race pallidus as being "open, sandy ground, often ...
Terry A. Vaughan 「Mammals of the San Gabriel Mountains of California」
...The Wisconsin border along thewestern portion of the Upper Peninsula forms nodistinctive ecological boundary...
Thomas F. Weise 「An Experimental Translocation of the Eastern Timber Wolf」
...Inthese instances well marked ecological differences exist between thesubspecies involved...
James S. Findley 「Speciation of the Wandering Shrew」
...Although the different specieshave ecological preferences and habits which differ, several speciesof Microtus may occur together in local areas such as the above...
Sydney Anderson 「Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado」
...taylori may resultfrom each having occupied the same ecological niche in differentperiods...
Robert L. Packard 「Speciation and Evolution of the Pygmy Mice, Genus Baiomys」
...In analyzing the ecological distribution within the forest, it is convenient to recognize five subdivisions (habitats); each is treated below as a unit...
William E. Duellman 「Amphibians and Reptiles of the Rainforests of Southern El Peten, Guatemala」
...—In this habitat the third dimension (height) of the rainforest probably is the most complex insofar as the inter-relationships of species and ecological niches are concerned...
William E. Duellman 「Amphibians and Reptiles of the Rainforests of Southern El Peten, Guatemala」
...Now that the important ecological factors of the major environmentshave been outlined, we may examine the local distribution of amphibiansin each of these...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
...On theother hand, the savannas and scrub forests are characterized by extremeconditions of desiccation, a factor of considerable importance inlimiting the ecological distribution of amphibians...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
...The secondpart of the study, now in preparation, deals with the ecological andhistorical geography of the herpetofauna...
William E. Duellman 「The Amphibians and Reptiles of Michoacán, México」
...The limited ecological data available suggest that thespecies inhabits the open mesquite grassland of the Mexican Plateau...
William E. Duellman 「The Amphibians and Reptiles of Michoacán, México」
...Specimens of this lizard have been collectedinfrequently; the few locality records and limited ecological dataindicate that it inhabits dense scrub forest and tropical semi-deciduousforest...
William E. Duellman 「The Amphibians and Reptiles of Michoacán, México」
...San Marcos, Guatemala) effort was madeto determine what, if any, ecological interspecific relationshipsexisted...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...Furthermore, we have included ecological and distributional data inour synthesis of interspecific relationships...
William E. Duellman 「Middle American Frogs of the Hyla microcephala Group」
...A preliminary survey and ecological study of the fishes of the SouthNinnescah and Spring Creek...
Artie L. Metcalf 「Fishes of Chautauqua, Cowley and Elk Counties, Kansas」
...An ecological study of the collared lizard (Crotaphytus collaris)...
Artie L. Metcalf 「Fishes of Chautauqua, Cowley and Elk Counties, Kansas」
...This is presumably attributable to the ecological barrier presented by the Wakarusa mainstream...
James E. Deacon 「Fishes of the Wakarusa River in Kansas」
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