BIOL 329 Lecture Notes - Lecture 38: Opossum, Critically Endangered, Douglas Squirrel
8 May 2018
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Lect 38
VIM: lives above the treeline (alpine and subalpine). Deforestation has allowed mountain lions and
oles uh greater aess to the VIM haitat (they stay o the tops of outais ad do’t trael
through dense forest). Large decline in VIM population. No dispersal of young males (eaten before they
get to the next alpine). 2003: 70 adults. Critically endangered.
Red Squirrel: diurnal, conifer cones, songbird chicks and eggs.
Douglas Squirrel: habitat.
Grey Squirrel: no hibernation, eats bulbs, acorns. No known competition with other squirrels.
Columbian ground squirrel: hibernates for 7 months.
Golden Mantled ground squirrel: hibernator.
Chiroptera (bats): most speciose and widely distributed of all mammals. Crepuscular, all bats can
navigate in full darkness, frequency-modulated echolocation. 20-120 kHz. High frequencies short range
and detect small items. Low frequencies travel further but cannot resolve small items. Most bats have
day roosts, night roosts and hibernation roosts. Species either overwinter and hibernate or migrate
south and hibernate. Long-lived...to 30 years. Females also roost in maternal colonies during birthing
(males not involved in parental care). 1 pup per year. Prey on arthropods. Colony of 150 big brown bats
consumes hundreds of thousands of bugs per year.
White-nose syndrome leads to major die-off in eastern NA. Expanding in westerly direction. Not yet
detected in BC.
Little Brown Bat: most widespread bat in NA. COSEWIC: endangered in BC.
Long-eared Myotis: Few hibernation sites, few roosting sites.
Kee’s Log-eared Myotis – selection of day-roosts y Kee’s Myotis
Found colony of insectivorous bats under rocks which are thermally heated.
Opossum, shrews, and moles.
Tetrapod longevity
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Document Summary
Vim: lives above the treeline (alpine and subalpine). Deforestation has allowed mountain lions and (cid:449)ol(cid:448)es (cid:373)u(cid:272)h greater a(cid:272)(cid:272)ess to the vim ha(cid:271)itat (they stay o(cid:374) the tops of (cid:373)ou(cid:374)tai(cid:374)s a(cid:374)d do(cid:374)"t tra(cid:448)el through dense forest). No dispersal of young males (eaten before they get to the next alpine). Red squirrel: diurnal, conifer cones, songbird chicks and eggs. Chiroptera (bats): most speciose and widely distributed of all mammals. Crepuscular, all bats can navigate in full darkness, frequency-modulated echolocation. High frequencies short range and detect small items. Low frequencies travel further but cannot resolve small items. Most bats have day roosts, night roosts and hibernation roosts. Species either overwinter and hibernate or migrate south and hibernate. Females also roost in maternal colonies during birthing (males not involved in parental care). Colony of 150 big brown bats consumes hundreds of thousands of bugs per year. White-nose syndrome leads to major die-off in eastern na. Little brown bat: most widespread bat in na.
