An Analysis of Migration as a Mortality Factor in the Gray Bat Based on Public Recoveries of Banded Bats

Tuttle, Merlin D.; Stevenson, Diane E.

doi:10.2307/2424704

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%

“…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%

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Moving across the border: modeling migratory bat populations

et al. 2013

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Abstract. The migration of animals across long distances and between multiple habitats presents a major challenge for conservation. For the migratory Mexican free-tailed bat (Tadarida brasiliensis mexicana), these challenges include identifying and protecting migratory routes and critical roosts in two countries, the United States and Mexico. Knowledge and conservation of bat migratory routes is critical in the face of increasing threats from climate change and wind turbines that might decrease migratory survival. We employ a new modeling approach for bat migration, network modeling, to simulate migratory routes between winter habitat in southern Mexico and summer breeding habitat in northern Mexico and the southwestern United States. We use the model to identify key migratory routes and the roosts of greatest conservation value to the overall population. We measure roost importance by the degree to which the overall bat population declined when the roost was removed from the model. The major migratory routes-those with the greatest number of migrants-were between winter habitat in southern Mexico and summer breeding roosts in Texas and the northern Mexican states of Sonora and Nuevo Leon. The summer breeding roosts in Texas, Sonora, and Nuevo Leon were the most important for maintaining population numbers and network structure -these are also the largest roosts. This modeling approach contributes to conservation efforts by identifying the most influential areas for bat populations, and can be used to as a tool to improve our understanding of bat migration for other species. We anticipate this approach will help direct coordination of habitat protection across borders.

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Section: Overview Of Modeling Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Moving across the border: modeling migratory bat populations

et al. 2013

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“…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%

Going wild: what a global small-animal tracking system could do for experimental biologists

Wikelski

Kays

Kasdin

et al. 2007

Journal of Experimental Biology

278

239

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Applications of a global small animal tracking systemSongbird movements as an example Imagine tracking the individual movements of red-billed queleas (Quelea quelea) across the African continent (Ward, 1971;Dallimer and Jones, 2002). Queleas are the world's most abundant birds and have a breeding population in excess of 1.5·billion. Single colonies can contain up to 30·million birds and these large individual colonies can destroy up to 5% of grain crops in the Sahel zone of Africa (Bruggers and Elliott, 1989). Queleas can migrate long distances, sometimes more Tracking animals over large temporal and spatial scales has revealed invaluable and spectacular biological information, particularly when the paths and fates of individuals can be monitored on a global scale. However, only large animals (greater than ~300·g) currently can be followed globally because of power and size constraints on the tracking devices. And yet the vast majority of animals is small. Tracking small animals is important because they are often part of evolutionary and ecological experiments, they provide important ecosystem services and they are of conservation concern or pose harm to human health. Here, we propose a small-animal satellite tracking system that would enable the global monitoring of animals down to the size of the smallest birds, mammals (bats), marine life and eventually large insects. To create the scientific framework necessary for such a global project, we formed the ICARUS initiative (www.IcarusInitiative.org), the International Cooperation for Animal Research Using Space. ICARUS also highlights how small-animal tracking could address some of the 'Grand Challenges in Environmental Sciences' identified by the US National Academy of Sciences, such as the spread of infectious diseases or the relationship between biological diversity and ecosystem functioning. Smallanimal tracking would allow the quantitative assessment of dispersal and migration in natural populations and thus help solve enigmas regarding population dynamics, extinctions and invasions. Experimental biologists may find a global small-animal tracking system helpful in testing, validating and expanding laboratory-derived discoveries in wild, natural populations. We suggest that the relatively modest investment into a global small-animal tracking system will pay off by providing unprecedented insights into both basic and applied nature.Tracking small animals over large spatial and temporal scales could prove to be one of the most powerful techniques of the early 21st century, offering potential solutions to a wide range of biological and societal questions that date back two millennia to the Greek philosopher Aristotle's enigma about songbird migration. Several of the more recent Grand Challenges in Environmental Sciences, such as the regulation and functional consequences of biological diversity or the surveillance of the population ecology of zoonotic hosts, pathogens or vectors, could also be addressed by a global small-animal tracking system. Our discussion ...

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“…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%

Assessment of the Population Status of the Gray Bat (Myotis grisescens); Status Review, DoD Initiatives, and Results of a Multi-Agency Effort to Survey Wintering Populations at Major Hibernacula, 2005-2007

Martin¹

2007

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An Analysis of Migration as a Mortality Factor in the Gray Bat Based on Public Recoveries of Banded Bats

Cited by 17 publications

References 0 publications

Moving across the border: modeling migratory bat populations

Moving across the border: modeling migratory bat populations

Going wild: what a global small-animal tracking system could do for experimental biologists

Assessment of the Population Status of the Gray Bat (Myotis grisescens); Status Review, DoD Initiatives, and Results of a Multi-Agency Effort to Survey Wintering Populations at Major Hibernacula, 2005-2007

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