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Changes in bird-migration patterns associated with human-induced mortality.

Carlos Palacín1, Juan C Alonso1, Carlos A Martín1,2

  • 1Museo Nacional de Ciencias Naturales-CSIC, C/ José Gutiérrez Abascal 2, E-28006, Madrid, Spain.

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PubMed
Summary
This summary is machine-generated.

Human-induced mortality, particularly from power line collisions, significantly increases the risk for migratory Great Bustards (Otis tarda). This higher mortality is causing a decline in migratory behavior within the population.

Keywords:
Great BustardOtis tardacambios en la migracióncostes de migracióndifferential survivallong-term monitoringmigration changesmigration costsseguimiento a largo plazosupervivencia diferencial

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Area of Science:

  • Ornithology
  • Conservation Biology
  • Ecology

Background:

  • Many bird populations are altering migratory behaviors due to environmental changes.
  • Great Bustards (Otis tarda) exhibit a partial migratory pattern, with both sedentary and migratory individuals present.
  • Understanding survival differences is crucial for population dynamics and migratory strategies.

Purpose of the Study:

  • To investigate survival rates of migratory versus sedentary male Great Bustards.
  • To evaluate the impact of survival differences on the species' overall migratory pattern.
  • To identify causes of mortality in Great Bustards.

Main Methods:

  • Conducted population counts and radio-tracked 180 male Great Bustards over 16 years.
  • Compared survival rates between migratory and sedentary individuals.
  • Analyzed causes of death, focusing on unnatural causes like power line collisions.

Main Results:

  • Migratory Great Bustards experienced 2.4 to 3.5 times higher mortality than sedentary individuals.
  • Collisions with power lines were the primary cause of unnatural death for migratory birds (21.3%).
  • The proportion of sedentary Great Bustards increased from 17% to 45% between 1997 and 2012, indicating a decrease in migratory tendency.

Conclusions:

  • Higher mortality rates for migratory birds, largely due to human-induced factors like power line collisions, are driving a decrease in migratory behavior.
  • The observed shift towards sedentary lifestyles is not linked to climate or habitat changes.
  • Human-induced mortality is a significant factor shaping migration patterns in species within human-dominated landscapes.