Harold D. Picton's research while affiliated with Montana State University and other places

Publications (2)

Article
The presence of 10 species of large mammals in 24 mountain ranges of central Montana was investigated. The occurrence of these species in relation to land area during historical times was found to be similar to the continental distribution described by biogeographic theory (z = 0·15). Habitat diversity was related to area and the topographic relief...
Article
CONTROVERSY surrounds the conflicts between the requirements of human safety and the preservation of grizzly bears (Ursus arctos horribilis) in western North America. It has been difficult to separate the effect of factors such as the closure of garbage dumps from that of the climate. It has also proved difficult to relate climatic data to changes...

Citations

... Because there are no methods to determine the minimum areas of reserves with reference only to ecosystem properties (see Soulé & Simberloff 1986, Beier 1993, biologists have been forced to conduct viability analysis for a few "indicator" or "umbrella" species as an effi cient way to address the viability of the whole system (Soulé 1987, Noss 1991. These analyses, however, have focused on large vertebrates, which require large areas (e. g. Picton 1979, Freemark & Merriam 1986, Dodd 1990, Laurance 1990, Beier 1993, Lankester et al 1991, Newmark 1991, Opdam 1991, Herkert 1994, Brooks et al 1999, Chiarello 1999 but little is known about the effects of fragmentation on faunas of invertebrates (see Hopkins & Webb 1984, Klein 1989, Daily & Ehrlich 1995. ...
... Numerous threatened species are attracted to sources of food created by human activity [e.g. garbage (Picton, 1978;Yirga et al., 2012), carrion (Roy & Dorrance, 1985;Guinard, Julliard & Barbraud, 2012) and agricultural products (Sukumar, 1990;Naughton-Treves et al., 1998)]. All of these anthropogenic foods may occur along roads and railways (e.g. ...