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Variation in Population Synchrony in a Multi-Species Seabird Community: Response to Changes in Predator Abundance.

Robertson GS, Bolton M, Morrison P, Monaghan P - PLoS ONE (2015)

Bottom Line: Roseate Tern abundance was negatively correlated with that of large gulls breeding on the island from 1975 to 2013, while Common Tern abundance was positively correlated with number of large gulls, and no significant correlations were found between large gull and Arctic and Sandwich Tern populations.Large gull abundance was negatively correlated with productivity of Arctic and Common Terns two years later, possibly due to predation risk after fledging, while no correlation with Roseate Tern productivity was found.The varying effect of predator abundance is most likely due to specific differences in the behaviour and ecology of even these closely-related species.

View Article: PubMed Central - PubMed

Affiliation: Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, United Kingdom.

ABSTRACT
Ecologically similar sympatric species, subject to typical environmental conditions, may be expected to exhibit synchronous temporal fluctuations in demographic parameters, while populations of dissimilar species might be expected to show less synchrony. Previous studies have tested for synchrony in different populations of single species, and those including data from more than one species have compared fluctuations in only one demographic parameter. We tested for synchrony in inter-annual changes in breeding population abundance and productivity among four tern species on Coquet Island, northeast England. We also examined how manipulation of one independent environmental variable (predator abundance) influenced temporal changes in ecologically similar and dissimilar tern species. Changes in breeding abundance and productivity of ecologically similar species (Arctic Sterna paradisaea, Common S. hirundo and Roseate Terns S. dougallii) were synchronous with one another over time, but not with a species with different foraging and breeding behaviour (Sandwich Terns Thalasseus sandvicensis). With respect to changes in predator abundance, there was no clear pattern. Roseate Tern abundance was negatively correlated with that of large gulls breeding on the island from 1975 to 2013, while Common Tern abundance was positively correlated with number of large gulls, and no significant correlations were found between large gull and Arctic and Sandwich Tern populations. Large gull abundance was negatively correlated with productivity of Arctic and Common Terns two years later, possibly due to predation risk after fledging, while no correlation with Roseate Tern productivity was found. The varying effect of predator abundance is most likely due to specific differences in the behaviour and ecology of even these closely-related species. Examining synchrony in multi-species assemblages improves our understanding of how whole communities react to long-term changes in the environment and suggests that changes in predator abundance may differentially affect populations of sympatric seabird species.

No MeSH data available.


Related in: MedlinePlus

Cross-correlation functions calculated for large gull detrended and standardised breeding population abundance (number of breeding pairs) and tern productivity data from 1991–2013 (excluding 2003) for a) large gull and Arctic Terns, b) large gull and Common Terns and c) large gulls and Roseate Terns.A significant negative correlation (where the correlation coefficient lay outside the lower 2.5% confidence interval) was found at lag 2 for Arctic (rt+2 = -0.51) and Common Terns (rt+2 = -0.77). There was no significant correlation between large gull breeding abundance and Roseate Tern productivity at any time lag.
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pone.0131543.g004: Cross-correlation functions calculated for large gull detrended and standardised breeding population abundance (number of breeding pairs) and tern productivity data from 1991–2013 (excluding 2003) for a) large gull and Arctic Terns, b) large gull and Common Terns and c) large gulls and Roseate Terns.A significant negative correlation (where the correlation coefficient lay outside the lower 2.5% confidence interval) was found at lag 2 for Arctic (rt+2 = -0.51) and Common Terns (rt+2 = -0.77). There was no significant correlation between large gull breeding abundance and Roseate Tern productivity at any time lag.

Mentions: Cross-correlation coefficients were also used to compare how large gull breeding abundance influenced productivity of Arctic, Common and Roseate Terns at different time lags (Fig 4). Fig 4a and 4b show that detrended and standardised large gull breeding abundance and productivity of Arctic and Common Terns were significantly negatively correlated at lag 2 (rt+2) years (rt+2 = -0.51 and -0.77 respectively). This suggests that annual increases in large gull abundance could negatively influence Arctic and Common Tern productivity two years later. Gull abundance did not influence Roseate Tern productivity at any time lag (Fig 4c).


Variation in Population Synchrony in a Multi-Species Seabird Community: Response to Changes in Predator Abundance.

Robertson GS, Bolton M, Morrison P, Monaghan P - PLoS ONE (2015)

Cross-correlation functions calculated for large gull detrended and standardised breeding population abundance (number of breeding pairs) and tern productivity data from 1991–2013 (excluding 2003) for a) large gull and Arctic Terns, b) large gull and Common Terns and c) large gulls and Roseate Terns.A significant negative correlation (where the correlation coefficient lay outside the lower 2.5% confidence interval) was found at lag 2 for Arctic (rt+2 = -0.51) and Common Terns (rt+2 = -0.77). There was no significant correlation between large gull breeding abundance and Roseate Tern productivity at any time lag.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4482655&req=5

pone.0131543.g004: Cross-correlation functions calculated for large gull detrended and standardised breeding population abundance (number of breeding pairs) and tern productivity data from 1991–2013 (excluding 2003) for a) large gull and Arctic Terns, b) large gull and Common Terns and c) large gulls and Roseate Terns.A significant negative correlation (where the correlation coefficient lay outside the lower 2.5% confidence interval) was found at lag 2 for Arctic (rt+2 = -0.51) and Common Terns (rt+2 = -0.77). There was no significant correlation between large gull breeding abundance and Roseate Tern productivity at any time lag.
Mentions: Cross-correlation coefficients were also used to compare how large gull breeding abundance influenced productivity of Arctic, Common and Roseate Terns at different time lags (Fig 4). Fig 4a and 4b show that detrended and standardised large gull breeding abundance and productivity of Arctic and Common Terns were significantly negatively correlated at lag 2 (rt+2) years (rt+2 = -0.51 and -0.77 respectively). This suggests that annual increases in large gull abundance could negatively influence Arctic and Common Tern productivity two years later. Gull abundance did not influence Roseate Tern productivity at any time lag (Fig 4c).

Bottom Line: Roseate Tern abundance was negatively correlated with that of large gulls breeding on the island from 1975 to 2013, while Common Tern abundance was positively correlated with number of large gulls, and no significant correlations were found between large gull and Arctic and Sandwich Tern populations.Large gull abundance was negatively correlated with productivity of Arctic and Common Terns two years later, possibly due to predation risk after fledging, while no correlation with Roseate Tern productivity was found.The varying effect of predator abundance is most likely due to specific differences in the behaviour and ecology of even these closely-related species.

View Article: PubMed Central - PubMed

Affiliation: Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, United Kingdom.

ABSTRACT
Ecologically similar sympatric species, subject to typical environmental conditions, may be expected to exhibit synchronous temporal fluctuations in demographic parameters, while populations of dissimilar species might be expected to show less synchrony. Previous studies have tested for synchrony in different populations of single species, and those including data from more than one species have compared fluctuations in only one demographic parameter. We tested for synchrony in inter-annual changes in breeding population abundance and productivity among four tern species on Coquet Island, northeast England. We also examined how manipulation of one independent environmental variable (predator abundance) influenced temporal changes in ecologically similar and dissimilar tern species. Changes in breeding abundance and productivity of ecologically similar species (Arctic Sterna paradisaea, Common S. hirundo and Roseate Terns S. dougallii) were synchronous with one another over time, but not with a species with different foraging and breeding behaviour (Sandwich Terns Thalasseus sandvicensis). With respect to changes in predator abundance, there was no clear pattern. Roseate Tern abundance was negatively correlated with that of large gulls breeding on the island from 1975 to 2013, while Common Tern abundance was positively correlated with number of large gulls, and no significant correlations were found between large gull and Arctic and Sandwich Tern populations. Large gull abundance was negatively correlated with productivity of Arctic and Common Terns two years later, possibly due to predation risk after fledging, while no correlation with Roseate Tern productivity was found. The varying effect of predator abundance is most likely due to specific differences in the behaviour and ecology of even these closely-related species. Examining synchrony in multi-species assemblages improves our understanding of how whole communities react to long-term changes in the environment and suggests that changes in predator abundance may differentially affect populations of sympatric seabird species.

No MeSH data available.


Related in: MedlinePlus