Endangered Cape Sable Seaside Sparrow Survival

We investigated survival for male, female, and first-year Cape Sable seaside sparrows (Ammodramus maritimus mirabilis, hereafter sparrows), a federally endangered bird restricted to the Florida Everglades, USA. Accurate estimates of survival are critical to improve management decisions and populatio...

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Veröffentlicht in:The Journal of wildlife management 2009-05, Vol.73 (4), p.530-537
Hauptverfasser: Boulton, Rebecca L, Lockwood, Julie L, Davis, Michelle J, Pedziwilk, Artur, Boadway, Kelly A, Boadway, Joshua J. T, Okines, David, Pimm, Stuart L
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container_end_page 537
container_issue 4
container_start_page 530
container_title The Journal of wildlife management
container_volume 73
creator Boulton, Rebecca L
Lockwood, Julie L
Davis, Michelle J
Pedziwilk, Artur
Boadway, Kelly A
Boadway, Joshua J. T
Okines, David
Pimm, Stuart L
description We investigated survival for male, female, and first-year Cape Sable seaside sparrows (Ammodramus maritimus mirabilis, hereafter sparrows), a federally endangered bird restricted to the Florida Everglades, USA. Accurate estimates of survival are critical to improve management decisions and population estimates for this and other threatened species. We used Program MARK to evaluate effects of age, sex, population membership, temporal variation, and ground-water levels on annual survival from mark–recapture data collected across 3 sparrow populations from 1997 to 2007. We found little evidence that annual survival rates differed between the populations or across ground-water levels, but we found high variability between years for both adult and juvenile survival. Our results revealed female sparrows experienced 14–19% lower survival than males. Sparrows experienced much lower survival during their first year of life and were short-lived (2–3 yr). Our results highlight sparrows' susceptibility to population declines and suggest that management actions aimed at increasing survival may be effective for this species' management.
doi_str_mv 10.2193/2007-467
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source Jstor Complete Legacy; Wiley Online Library Journals Frontfile Complete
subjects age structure
age-specific
Ammodramus maritimus mirabilis
Animal behavior
Birds
Breeding seasons
Ecosystems
Endangered animals
endangered species
Everglades
Female animals
Females
Floods
Florida Everglades
gender differences
Groundwater levels
Management and Conservation
mark-recapture
marshes
National parks
Native species
Population
Population decline
Population estimates
population size
Prairies
Sables
seaside sparrow
sex differences
Sparrows
Studies
Survival
Survival rates
temporal variation
Threatened species
viability
water levels
water table
wild birds
Wildlife management
Young animals
title Endangered Cape Sable Seaside Sparrow Survival
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