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Peer-reviewedCC BYProceedings. Biological sciences

Change in the demographic dynamics of a spatially structured population of a colonial waterbird after a perturbation affecting a large colony.

  • Killian A Gregory1
  • Odin Rumianowski1
  • Jean-Dominique Lebreton1
  • Pierre-André Crochet1
  • Aurelien Besnard2
  1. 1CEFE, Univ Montpellier, CNRS, EPHE, IRD , Montpellier, France.
  2. 2CEFE, Univ Montpellier, CNRS, EPHE-PSL University, IRD , Montpellier, France.
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Abstract

Localized perturbations may affect spatially structured populations (SSPs) as a whole by altering dispersal between patches. Yet, such large-scale consequences remain poorly understood and may depend on the proportion of the SSP affected by the perturbation. Here, we used correlative analyses and integrated population models to investigate the impact of pond draining-localized perturbations of breeding site availability-on the structure and demographics of an SSP of black-headed gulls (Chroicocephalus ridibundus). Pond draining regularly affected patches occupied by colonies, reducing the occupancy probability of those patches in subsequent years, but causing no visible changes in population growth or structure as breeders relocated to unperturbed patches. However, the draining of the pond occupied by the largest colony in the system (64% of total breeders) triggered the immediate emigration of over 60% of breeders outside the SSP, with no subsequent recovery. In the following years, apparent survival showed increased interannual variability, suggesting greater sensitivity of the SSP to the perturbation of smaller colonies. Dispersal between colonies also became more uniform, reflecting the homogenization of colony sizes after the emigration event in a context of informed dispersal. Considering perturbation magnitude and dispersal mechanisms appears essential for understanding the response and resilience of SSPs to local perturbations.

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Cite

BibTeXRIS
BibTeX
@article{gregory2026change,
  title = {{Change in the demographic dynamics of a spatially structured population of a colonial waterbird after a perturbation affecting a large colony.}},
  author = {Killian A Gregory and Odin Rumianowski and Jean-Dominique Lebreton and Pierre-André Crochet and Aurelien Besnard},
  journal = {Proceedings. Biological sciences},
  year = {2026},
  month = oct,
  doi = {10.1098/rspb.2026.0388},
  url = {https://europepmc.org/article/MED/42869470},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Change in the demographic dynamics of a spatially structured population of a colonial waterbird after a perturbation affecting a large colony.
AU  - Killian A Gregory
AU  - Odin Rumianowski
AU  - Jean-Dominique Lebreton
AU  - Pierre-André Crochet
AU  - Aurelien Besnard
PY  - 2026
DA  - 2026/10/01
JO  - Proceedings. Biological sciences
DO  - 10.1098/rspb.2026.0388
UR  - https://europepmc.org/article/MED/42869470
AB  - Localized perturbations may affect spatially structured populations (SSPs) as a whole by altering dispersal between patches. Yet, such large-scale consequences remain poorly understood and may depend on the proportion of the SSP affected by the perturbation. Here, we used correlative analyses and integrated population models to investigate the impact of pond draining-localized perturbations of breeding site availability-on the structure and demographics of an SSP of black-headed gulls (Chroicocephalus ridibundus). Pond draining regularly affected patches occupied by colonies, reducing the occupancy probability of those patches in subsequent years, but causing no visible changes in population growth or structure as breeders relocated to unperturbed patches. However, the draining of the pond occupied by the largest colony in the system (64% of total breeders) triggered the immediate emigration of over 60% of breeders outside the SSP, with no subsequent recovery. In the following years, apparent survival showed increased interannual variability, suggesting greater sensitivity of the SSP to the perturbation of smaller colonies. Dispersal between colonies also became more uniform, reflecting the homogenization of colony sizes after the emigration event in a context of informed dispersal. Considering perturbation magnitude and dispersal mechanisms appears essential for understanding the response and resilience of SSPs to local perturbations.
SN  - 0962-8452
SN  - 1471-2954
ER  -