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title Consequences of population change for local abundance and site occupancy of wintering waterbirds
authors Mendez, V; Gill, JA; Alves, JA; Burton, NHK; Davies, RG
author full name Mendez, Veronica; Gill, Jennifer A.; Alves, Jose A.; Burton, Niall H. K.; Davies, Richard G.
title Consequences of population change for local abundance and site occupancy of wintering waterbirds
nationality internacional
source DIVERSITY AND DISTRIBUTIONS
language English
document type Article
author keywords local abundance; occupancy; population dynamics; population threshold; shorebirds; site protection
keywords plus CONSPECIFIC REPRODUCTIVE SUCCESS; BREEDING HABITAT SELECTION; CLIMATE-CHANGE; RANGE SIZE; BIRDS; DYNAMICS; BRITAIN; TRENDS; AREAS
abstract Aim: Population size changes can lead to changes in local abundance and/or site occupancy, depending on the processes influencing site use by individuals. Here, we quantify such changes for wintering waterbirds and assess their implications for widely used conservation strategies in which sites that support in excess of a given proportion of a population are prioritized for protection. Location: Britain. Methods: We use long-term survey data to quantify changes in population size and distribution for 19 waterbird species across Britain. Results: Population changes in these species have varied greatly (from declines of similar to 25% to increases of > 1,600%) over 26 years, and we show that change in local abundance was the predominant consequence of these changes, while colonization of new sites mainly occurred in response to large population increases. For most species, changes in abundance and occupancy were spatially dependent over relatively short distances, consistent with (but not conclusive of) density-dependent spillover. Levels of occupancy among species were negatively associated with proportions of sites, and populations within sites, exceeding the 1% of total population threshold for site protection. For species increasing in overall population size, the occurrence of small incipient populations at new sites resulted in declines in the number of sites supporting > 1% of the total population and the proportion of the population supported by these sites. Main conclusions: Fluctuations in waterbird population size are more likely to result in changes in local abundance than distribution. Consequences of population change for site protection when abundance thresholds are used for site designation depend on shifts in the evenness of distribution of abundances across sites, and whether occupancy is increasing or decreasing. Range-expanding species have an increased likelihood of losing some sites, and populations within sites, exceeding the 1% of total population threshold for site protection.
author address [Mendez, Veronica; Gill, Jennifer A.; Davies, Richard G.] Univ E Anglia, Sch Biol Sci, Norwich Res Pk, Norwich, Norfolk, England; [Alves, Jose A.] Univ Aveiro, CESAM, Aveiro, Portugal; [Alves, Jose A.] Univ Iceland, South Iceland Res Ctr, Selfoss, Iceland; [Burton, Niall H. K.] British Trust Ornithol, Thetford, England
reprint address Mendez, V (reprint author), Univ E Anglia, Sch Biol Sci, Norwich Res Pk, Norwich, Norfolk, England.
e-mail address v.mendez@uea.ac.uk
orcid number Mendez, Veronica/0000-0001-9476-4666; Alves, Jose/0000-0001-7182-0936; Gill, Jennifer/0000-0003-0167-6857
funding agency and grant number UEA CASE studentship; British Trust for Ornithology; FCT [SFRH/BPD/91527/201]; NERC [NE/M012549/1]
funding text This research was funded through a UEA CASE studentship in partnership with the British Trust for Ornithology. Jose A. Alves was supported by FCT (SFRH/BPD/91527/2012) and Jennifer A. Gill supported by NERC (NE/M012549/1).
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publisher WILEY
publisher city HOBOKEN
publisher address 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
issn 1366-9516
29-character source abbreviation DIVERS DISTRIB
iso source abbreviation Divers. Distrib.
publication date JAN
year published 2018
volume 24
issue 1
beginning page 24
ending page 35
digital object identifier (doi) 10.1111/ddi.12653
subject category 12
document delivery number Biodiversity Conservation; Ecology
unique article identifier Biodiversity & Conservation; Environmental Sciences & Ecology
link https://doi.org/10.1111/ddi.12653
CESAM authors