Large-scale seabird community structure along oceanographic gradients in the Scotia Sea and northern Antarctic Peninsula

Victoria Marja Sofia Ollus*, Martin Biuw, Andrew Lowther, Per Fauchald, John Elling Deehr Johannessen, Lucía Martina Martín López, Kalliopi C. Gkikopoulou, W. Chris Oosthuizen, Ulf Lindstrøm

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Downloads (Pure)

Abstract

Introduction: The Scotia Sea and Antarctic Peninsula are warming rapidly and changes in species distribution are expected. In predicting habitat shifts and considering appropriate management strategies for marine predators, a community-level understanding of how these predators are distributed is desirable. Acquiring such data, particularly in remote areas, is often problematic given the cost associated with the operation of research vessels. Here we use cruise vessels as sampling platforms to explore seabird distribution relative to habitat characteristics.

Methods: Data on seabird at-sea distribution were collected using strip-transect counts throughout the Antarctic Peninsula and Scotia Sea in the austral summer of 2019-2020. Constrained correspondence analysis (CCA) and generalized additive models (GAM) were used to relate seabird community composition, density, and species richness to environmental covariates.

Results: Species assemblages differed between oceanographic areas, with sea surface temperature and distance to coast being the most important predictors of seabird distribution. Our results further revealed a geographic separation of distinct communities rather than hotspot regions in the study area in summer.

Discussion: These findings highlight the importance of large-scale environmental characteristics in shaping seabird community structure, presumably through underlying prey distribution and interspecific interactions. The present study contributes to the knowledge of seabird distribution and habitat use as well as the baseline for assessing the response of Antarctic seabird communities to climate warming. We argue that cruise vessels, when combined with structured research surveys, can provide a cost-effective additional tool for the monitoring of community and ecosystem level changes.
Original languageEnglish
Article number1233820
Number of pages15
JournalFrontiers in Marine Science
Volume10
DOIs
Publication statusPublished - 18 Sept 2023

Keywords

  • Habitat use
  • Opportunistic sampling platforms
  • Marine predators
  • Seabirds
  • Biogeography
  • Southern Ocean
  • Spatial ecology
  • Community composition

Fingerprint

Dive into the research topics of 'Large-scale seabird community structure along oceanographic gradients in the Scotia Sea and northern Antarctic Peninsula'. Together they form a unique fingerprint.

Cite this