. The Canadian field-naturalist. 1987 Clough: Relations of Small Mammals 41. Figure L Majorforest types of Maine with the locations of the four areas of small mammal collections for this study. twice in the month previous to mammal sampling. The spruce plantation which received the herbicide 2,4,5-T (2,4,5-trichlorophenoxy acetic acid) was clearcut and planted with seedlings in 1978. The herbicide was applied by air in the spring of 1982. Stands with complete defoliation of spruce and fir were located within Moosehorn National Wildlife Refuge and Baxter State Park where insecticides are not us
. The Canadian field-naturalist. 1987 Clough: Relations of Small Mammals 41. Figure L Majorforest types of Maine with the locations of the four areas of small mammal collections for this study. twice in the month previous to mammal sampling. The spruce plantation which received the herbicide 2,4,5-T (2,4,5-trichlorophenoxy acetic acid) was clearcut and planted with seedlings in 1978. The herbicide was applied by air in the spring of 1982. Stands with complete defoliation of spruce and fir were located within Moosehorn National Wildlife Refuge and Baxter State Park where insecticides are not used. Small mammals were collected with lines of commercial snap traps baited with a mixture of peanut butter and rolled oats. Trap lines were either 10 or 20 stations long with 10 meters between stations. Three traps were set at each station and left out for three nights. On most sites two lines were set 20 m apart. Animals were collected each morning and specimens were weighed, measured, and autopsied for sex and reproductive status. Selected specimens were prepared as museum specimens and kept in my own collection. A total of 5490 trap nights (TN) constituted the field collection effort. The analysis of trap results was done by habitat, by general forest category, and by species. Relative abundance of animals was measured by numbers caught per 100 TN and relative biomass as body mass in grams per 100 TN. Species richness of communities was the number of species represented. Species diversity was measured by the Shannon index (Pielou 1975) where H'= - X p, lognp,. The evenness of apportionment of individuals among species in a habitat or forest category was measured according to Pielou(1975) where J'- ^ logn s -. The niche breadth of species with respect to habitat types was measured as 1 by Krebs and Wingate (1976) as B -. The small mammal communities were further analyzed by trophic levels. All species of shrews are insectivorous. The rodents were separated as grazers-omnivor
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