NDLI: Spatially correlated environmental factors drive synchronisation in populations of the Dalmatian Pelican

Content Provider	Springer Nature Link
Author	Doxa, Aggeliki Theodorou, Konstantis Crivelli, Alain J. Hatzilacou, Dionyssia Catsadorakis, Giorgos Malakou, Myrcini Nazirides, Theodoros Robert, Alexandre
Copyright Year	2012
Abstract	Spatial synchrony in population dynamics has been documented recently across a range of taxa, and a number of hypotheses about the mechanisms driving spatial synchrony and the consequences of this phenomenon for the persistence of populations have emerged. Spatial environmental covariance is one of the principal factors influencing this synchrony on a large scale. However, most studies focus on population abundances, and little evidence exists on the spatial synchrony of demographic parameters. We used a 15-year dataset from two populations of a vulnerable bird species, the Dalmatian Pelican (Pelecanus crispus), to identify local and global environmental factors that cause population synchrony. We show that survival rates were temporally synchronised between the studied populations and that a large part (>50 % for both populations) of this covariation was driven by local environmental conditions. Several components of the North Atlantic Oscillation index were correlated with local climatic conditions, but not all of these components can be used as informative proxies for future variation in survival. We also present evidence that an individual’s future survival can be strongly influenced by the conditions occurring during the early period of its life. Environmental factors such as water level and food availability had similar influences on breeding success and juvenile survival. Juvenile survival was lower during dry years and years of low food availability. This finding indicated that intra-specific competition may act as a limiting factor for species demography, especially in large populations. Estimating the strength of synchrony is important and should be considered in population and metapopulation analyses and in relationship to conservation measures.
Starting Page	499
Ending Page	507
Page Count	9
File Format	PDF
ISSN	14383896
Journal	Population Ecology
Volume Number	54
Issue Number	4
e-ISSN	1438390X
Language	English
Publisher	Springer Japan
Publisher Date	2012-07-28
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Demographic parameters Drought Food availability Mediterranean climate Population synchrony Zoology Ecology Forestry Behavioural Sciences Evolutionary Biology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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