Rediscovery of Discus Brunsoni Berry 1955 And Oreohelix Alpina Elrod 1901 in
Rediscovery of Discus Brunsoni Berry 1955 And Oreohelix Alpina Elrod 1901 in
P Paul Hendricks
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Ratios of each species near the talus surface could be representative for all depths in talus. Second, I found significant differences between the two species in substrate use. Some D. Brunsoni were found on foliose lichen (tentatively identified as Arctoparmelia subcentrifuga ) growing on the diorite, but otherwise were on bare rock. In contrast, O. Elrodi were most often found on organic litter and vegetation. Preference by O. Elrodi for organic litter may keep them nearer the surface of talu...s slopes where litter accumulations are larger and apparently more numerous. Third, larger shell size of O. Elrodi might reduce its rate of desiccation by decreasing the surface area/volume ratio (see Goodfriend 1986), allowing larger individuals to remain nearer the drier talus surface for 11 longer periods than D. Brunsoni and small O. Elrodi . The four live O. Ehodi found on 10 June in warm and dry conditions were 18-21 mm diameter and estivating at that time. Fourth, D. Brunsoni may tend to be nocturnal or crepuscular and make vertical migrations to the talus surface during periods of activity (Brunson 1956).
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