Potential causes of population declines in forest fragments in an Amazonian frog

W. Chris Funk; L. Scott Mills

doi:10.1016/S0006-3207(02)00274-4

Potential causes of population declines in forest fragments in an Amazonian frog

W. Chris Funk
, L. Scott Mills

Wildlife Biology

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

Forest fragmentation results in population declines and extinctions for many forest vertebrates, but little is known about the mechanisms causing declines in fragments. We investigated potential causes of declines in forest fragments for an Amazonian forest frog (Colostethus stepheni) at an experimental fragmentation study site in central Amazonian Brazil using field estimates of abundance and vital rates coupled with population simulations. Although adult male survival was not reduced by fragmentation, mean clutch size was reduced by 17%. Population simulations demonstrate that a reduction in clutch size of this magnitude is sufficient to cause the observed magnitude of population declines in fragments. Female snout-vent length was also reduced in fragments and may be related to the observed reduction in clutch size.

Original language	English
Pages (from-to)	205-214
Number of pages	10
Journal	Biological Conservation
Volume	111
Issue number	2
DOIs	https://doi.org/10.1016/S0006-3207(02)00274-4
State	Published - Jun 2003

Funding

This paper was improved by comments from William Laurance, William Magnusson, Andrew Sheldon, David A. Tallmon, and two anonymous reviewers. Mark Lindberg provided advice on capture–recapture modeling during early stages of this project. We are indebted to Ocirio Pereira and Francisco Marques for help with field work. The Biological Dynamics of Forest Fragments Project (BDFFP) staff provided logistical support. W. Chris Funk was supported by an NSF Graduate Research Traineeship supplement (DGE 9553611) and an NSF Graduate Research Fellowship (DGE 9616153) during the course of this study. L. Scott Mills acknowledges the US.D.A (NRI Competitive Grant Program/US.D.A 97-35101-4355) and NSF DEB-9870654. This paper is publication number 390 of the BDFFP.

Funders	Funder number
DGE 9553611, DGE 9616153
Niroo Research Institute Tehran

Keywords

Amazonian Brazil
Clutch size
Colostethus stepheni
Forest fragmentation
Population decline
Population simulations
Survival probability

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title = "Potential causes of population declines in forest fragments in an Amazonian frog",

abstract = "Forest fragmentation results in population declines and extinctions for many forest vertebrates, but little is known about the mechanisms causing declines in fragments. We investigated potential causes of declines in forest fragments for an Amazonian forest frog (Colostethus stepheni) at an experimental fragmentation study site in central Amazonian Brazil using field estimates of abundance and vital rates coupled with population simulations. Although adult male survival was not reduced by fragmentation, mean clutch size was reduced by 17\%. Population simulations demonstrate that a reduction in clutch size of this magnitude is sufficient to cause the observed magnitude of population declines in fragments. Female snout-vent length was also reduced in fragments and may be related to the observed reduction in clutch size.",

keywords = "Amazonian Brazil, Clutch size, Colostethus stepheni, Forest fragmentation, Population decline, Population simulations, Survival probability",

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note = "Funding Information: This paper was improved by comments from William Laurance, William Magnusson, Andrew Sheldon, David A. Tallmon, and two anonymous reviewers. Mark Lindberg provided advice on capture–recapture modeling during early stages of this project. We are indebted to Ocirio Pereira and Francisco Marques for help with field work. The Biological Dynamics of Forest Fragments Project (BDFFP) staff provided logistical support. W. Chris Funk was supported by an NSF Graduate Research Traineeship supplement (DGE 9553611) and an NSF Graduate Research Fellowship (DGE 9616153) during the course of this study. L. Scott Mills acknowledges the US.D.A (NRI Competitive Grant Program/US.D.A 97-35101-4355) and NSF DEB-9870654. This paper is publication number 390 of the BDFFP.",

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AU - Mills, L. Scott

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N2 - Forest fragmentation results in population declines and extinctions for many forest vertebrates, but little is known about the mechanisms causing declines in fragments. We investigated potential causes of declines in forest fragments for an Amazonian forest frog (Colostethus stepheni) at an experimental fragmentation study site in central Amazonian Brazil using field estimates of abundance and vital rates coupled with population simulations. Although adult male survival was not reduced by fragmentation, mean clutch size was reduced by 17%. Population simulations demonstrate that a reduction in clutch size of this magnitude is sufficient to cause the observed magnitude of population declines in fragments. Female snout-vent length was also reduced in fragments and may be related to the observed reduction in clutch size.

AB - Forest fragmentation results in population declines and extinctions for many forest vertebrates, but little is known about the mechanisms causing declines in fragments. We investigated potential causes of declines in forest fragments for an Amazonian forest frog (Colostethus stepheni) at an experimental fragmentation study site in central Amazonian Brazil using field estimates of abundance and vital rates coupled with population simulations. Although adult male survival was not reduced by fragmentation, mean clutch size was reduced by 17%. Population simulations demonstrate that a reduction in clutch size of this magnitude is sufficient to cause the observed magnitude of population declines in fragments. Female snout-vent length was also reduced in fragments and may be related to the observed reduction in clutch size.

KW - Amazonian Brazil

KW - Clutch size

KW - Colostethus stepheni

KW - Forest fragmentation

KW - Population decline

KW - Population simulations

KW - Survival probability

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JO - Biological Conservation

JF - Biological Conservation

IS - 2

ER -

Potential causes of population declines in forest fragments in an Amazonian frog

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