Density- and age-dependent reproduction partially compensates culling efforts of invasive non-native American mink

Yolanda Melero Cavero, Ella Robinson, Xavier Lambin*

*Corresponding author for this work

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Management strategies of wildlife species must pay due regard to density dependent changes in vital rates. Knowledge of density dependent relationships is sparse for most species but such knowledge ought to inform adaptive management. Using data from a large-scale, 6 years of control effort of the invasive non-native American mink (Neovison vison) in Scotland, we analysed density dependent changes in reproduction as revealed by placental scar counts in culled females. Control strongly reduced mink density but it varied substantially over time and space, reflecting variation in when control was initiated in each river section. We used hurdle statistical models to simultaneously relate the probability of conception, litter size and female age to prevailing mink density in river sections where the female was culled. Both the probability of conceiving a litter (average 0.81) and litter size (average 5.52 pups) increased as the density of females, but not males, declined. In addition, there was a senescent decline in both components of fecundity, which given culling of mink and subsequent reinvasions, resulted in a younger population, adding further to density dependent compensation in fecundity. There was no evidence of depensation, even at the lowest density. The predicted combined impact of changes in density and age structure could lead to an increase in fecundity of up to 2.1 pups per female occupying or reinvading the controlled area. Control strategies must be sufficiently adaptable and robust in order to overcome this compensation and suppress densities of mink and other invasive mammals.

Original languageEnglish
Pages (from-to)2645-2657
Number of pages13
JournalBiological Invasions
Volume17
Issue number9
Early online date16 May 2015
DOIs
Publication statusPublished - Sep 2015

Keywords

  • Density dependence
  • Compensation
  • Senescence
  • Fecundity
  • Introduced species
  • Population-dynamics
  • Mustela-vison
  • Red-fox
  • Management
  • Carnivore
  • Impacts
  • Numbers
  • Martens
  • Europe

Cite this

Density- and age-dependent reproduction partially compensates culling efforts of invasive non-native American mink. / Melero Cavero, Yolanda; Robinson, Ella; Lambin, Xavier.

In: Biological Invasions, Vol. 17, No. 9, 09.2015, p. 2645-2657.

Research output: Contribution to journalArticle

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abstract = "Management strategies of wildlife species must pay due regard to density dependent changes in vital rates. Knowledge of density dependent relationships is sparse for most species but such knowledge ought to inform adaptive management. Using data from a large-scale, 6 years of control effort of the invasive non-native American mink (Neovison vison) in Scotland, we analysed density dependent changes in reproduction as revealed by placental scar counts in culled females. Control strongly reduced mink density but it varied substantially over time and space, reflecting variation in when control was initiated in each river section. We used hurdle statistical models to simultaneously relate the probability of conception, litter size and female age to prevailing mink density in river sections where the female was culled. Both the probability of conceiving a litter (average 0.81) and litter size (average 5.52 pups) increased as the density of females, but not males, declined. In addition, there was a senescent decline in both components of fecundity, which given culling of mink and subsequent reinvasions, resulted in a younger population, adding further to density dependent compensation in fecundity. There was no evidence of depensation, even at the lowest density. The predicted combined impact of changes in density and age structure could lead to an increase in fecundity of up to 2.1 pups per female occupying or reinvading the controlled area. Control strategies must be sufficiently adaptable and robust in order to overcome this compensation and suppress densities of mink and other invasive mammals.",
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note = "Acknowledgments Y. M. was funded by a Marie Curie FP7-PEOPLE-2011-IEF 300288-Project Depensation and XL by NERC Grant NE/J01396X/1. We thank the Scottish Mink Initiative, staff, funders and multiple mink volunteers for the continued effort, samples and data, Alex Douglas and Matthew K. Oliver for statistical advice. We also thank MSc. William Morgan, MSc. Ewan Mchenry and Dr. Emma Sheehy for their English grammar and spelling correction.",
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N1 - Acknowledgments Y. M. was funded by a Marie Curie FP7-PEOPLE-2011-IEF 300288-Project Depensation and XL by NERC Grant NE/J01396X/1. We thank the Scottish Mink Initiative, staff, funders and multiple mink volunteers for the continued effort, samples and data, Alex Douglas and Matthew K. Oliver for statistical advice. We also thank MSc. William Morgan, MSc. Ewan Mchenry and Dr. Emma Sheehy for their English grammar and spelling correction.

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N2 - Management strategies of wildlife species must pay due regard to density dependent changes in vital rates. Knowledge of density dependent relationships is sparse for most species but such knowledge ought to inform adaptive management. Using data from a large-scale, 6 years of control effort of the invasive non-native American mink (Neovison vison) in Scotland, we analysed density dependent changes in reproduction as revealed by placental scar counts in culled females. Control strongly reduced mink density but it varied substantially over time and space, reflecting variation in when control was initiated in each river section. We used hurdle statistical models to simultaneously relate the probability of conception, litter size and female age to prevailing mink density in river sections where the female was culled. Both the probability of conceiving a litter (average 0.81) and litter size (average 5.52 pups) increased as the density of females, but not males, declined. In addition, there was a senescent decline in both components of fecundity, which given culling of mink and subsequent reinvasions, resulted in a younger population, adding further to density dependent compensation in fecundity. There was no evidence of depensation, even at the lowest density. The predicted combined impact of changes in density and age structure could lead to an increase in fecundity of up to 2.1 pups per female occupying or reinvading the controlled area. Control strategies must be sufficiently adaptable and robust in order to overcome this compensation and suppress densities of mink and other invasive mammals.

AB - Management strategies of wildlife species must pay due regard to density dependent changes in vital rates. Knowledge of density dependent relationships is sparse for most species but such knowledge ought to inform adaptive management. Using data from a large-scale, 6 years of control effort of the invasive non-native American mink (Neovison vison) in Scotland, we analysed density dependent changes in reproduction as revealed by placental scar counts in culled females. Control strongly reduced mink density but it varied substantially over time and space, reflecting variation in when control was initiated in each river section. We used hurdle statistical models to simultaneously relate the probability of conception, litter size and female age to prevailing mink density in river sections where the female was culled. Both the probability of conceiving a litter (average 0.81) and litter size (average 5.52 pups) increased as the density of females, but not males, declined. In addition, there was a senescent decline in both components of fecundity, which given culling of mink and subsequent reinvasions, resulted in a younger population, adding further to density dependent compensation in fecundity. There was no evidence of depensation, even at the lowest density. The predicted combined impact of changes in density and age structure could lead to an increase in fecundity of up to 2.1 pups per female occupying or reinvading the controlled area. Control strategies must be sufficiently adaptable and robust in order to overcome this compensation and suppress densities of mink and other invasive mammals.

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KW - Fecundity

KW - Introduced species

KW - Population-dynamics

KW - Mustela-vison

KW - Red-fox

KW - Management

KW - Carnivore

KW - Impacts

KW - Numbers

KW - Martens

KW - Europe

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JO - Biological Invasions

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