1977
DOI: 10.2307/2424704
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An Analysis of Migration as a Mortality Factor in the Gray Bat Based on Public Recoveries of Banded Bats

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Cited by 17 publications
(13 citation statements)
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“…Each migratory route is weighted with a survival cost derived from its length (Taylor andNorris 2010, Rayfield et al 2011)-individuals traveling on longer routes are assumed to have lowered survival. This reflects the high mortality rates and poor body conditions that have been reported in bats during migration (Constantine 1967, Cockrum 1973, Tuttle and Stevenson 1977, Tuttle and Stevenson 1982. Longer migrations may increase mortality rates due to increased exposure to inclement weather and predators, and the increased difficulty of locating roosts (Constantine 1967, Fleming andEby 2003).…”
Section: Overview Of Modeling Approachmentioning
confidence: 99%
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“…Each migratory route is weighted with a survival cost derived from its length (Taylor andNorris 2010, Rayfield et al 2011)-individuals traveling on longer routes are assumed to have lowered survival. This reflects the high mortality rates and poor body conditions that have been reported in bats during migration (Constantine 1967, Cockrum 1973, Tuttle and Stevenson 1977, Tuttle and Stevenson 1982. Longer migrations may increase mortality rates due to increased exposure to inclement weather and predators, and the increased difficulty of locating roosts (Constantine 1967, Fleming andEby 2003).…”
Section: Overview Of Modeling Approachmentioning
confidence: 99%
“…The model does not estimate population growth over time. We assume that survival declines with an increase in distance migrated, as high mortality rates and poor body conditions have been reported in bats during migration (Constantine 1967, Cockrum 1973, Tuttle and Stevenson 1977 v www.esajournals.org Stevenson 1982). As a consequence of the costs of migration, we hypothesize that that the most influential summer breeding roosts should be located closest to the winter regions in central and southern Mexico.…”
Section: Introductionmentioning
confidence: 99%
“…All other data on individual songbird migration are limited to one or two nights of migratory flight (Cochran et al, 2004;Diehl and Larkin, 1998;Wikelski et al, 2003;Cochran and Wikelski, 2005;Bowlin et al, 2004) or banding studies connecting dots across continents (Thorup and Rahbek, 2004). We know even less about migration in small mammals such as bats (Tuttle and Stevenson, 1977;Cryan et al, 2004). Even so, this lack of knowledge of individual migration pattern should not conceal the fact that major progress in small-animal migration continues to be made, with spectacular insights being published in rapid succession (Alerstam and Hedenström, 1998;Berthold, 2001).…”
Section: The Power Of Combined Laboratory and Field Experimentsmentioning
confidence: 99%
“…Many of the early studies dealt with basic ecology, behavior, and characterization of roost sites (e.g., Twente 1955;Hall and Wilson 1966;Tuttle 1975Tuttle , 1976aTuttle , 1976bTuttle and Stevenson 1977;LaVal et al 1977). General information on gray bat ecology, habitat requirements, behavior, population threats, and management are provided below as background information needed to understand the biology, natural history, habitat requirements, and management needs of the species (excerpted from Mitchell 1998 andMitchell andMartin 2002).…”
Section: Gray Bat Natural History and Population Threatsmentioning
confidence: 99%
“…During hibernation the bats become torpid, and the body temperature drops to almost the ambient temperature (Henshaw 1970). This temperature drop allows the body to conserve fat reserves that must last through 6 or 7 months of hibernation and spring migration (Tuttle and Stevenson 1977). Gray bats often hang from cave ceilings in compact clusters composed of several thousand individuals, sometimes several tiers thick, in densities of more than 1800 bats per m² (170 per ft²) (Hall 1962;Harvey 1975).…”
Section: Behavior Hibernationmentioning
confidence: 99%