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Natural expansion versus translocation in a previously human-persecuted bird of prey

Morandini, Virginia; de Benito, Elena; Newton, Ian; Ferrer, Miguel. 2017 Natural expansion versus translocation in a previously human-persecuted bird of prey. Ecology and Evolution, 7 (11). 3682-3688. 10.1002/ece3.2896

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Abstract/Summary

Many threatened species in Europe have been expanding their distributions during recent decades owing to protection measures that overcome historical human activity that has limited their distributions. Range expansion has come about via two processes, natural expansion from existing range and reintroductions to new ranges. Reintroductions may prove to be a better way to establish populations because individuals are less subject to competitive relationships lowering breeding success than individuals expanding from existing populations. Whether this is true, however, remains uncertain. We compared success of breeding pairs of an expanding and a reintroduced population of spanish imperial eagles monitored for over 15 years in the south of Spain. We found significant differences in productivity between breeding pairs of each population. Newly established territories in reintroduction areas were almost three times more productive than new territories established as individuals expanded out from an existing population. We conclude that among these eagle populations reintroduced to new areas may fare as well or better than individuals expanding out form existing populations.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1002/ece3.2896
CEH Sections: CEH fellows
ISSN: 2045-7758
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: Aquila adalberti, human disturbance, natal dispersal, refuges areas, reintroduction
NORA Subject Terms: Ecology and Environment
Date made live: 29 Jun 2017 10:25 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/517246

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