Benthic communities and their drivers: A spatial analysis off the Antarctic Peninsula


Contact
julian.gutt [ at ] awi.de

Abstract

Multiple environmental factors control benthic community patterns, and their relative importance varies with spatial scale. Since this variation is difficult to evaluate quantitatively, extensive sampling across a broad range of spatial scales is required. Here, we present a first case study on Southern Ocean shelf benthos, in which mega-epibenthic communities and biota-environment relationships have been explored at multiple spatial scales. The analyses encompassed 20 seafloor, water-column, and sea-ice parameters, as well as abundances of 18 mega-epibenthic taxa in a total of 2799 high-resolution seabed images taken at 28 stations at 32–786 m depth off the northern Antarctic Peninsula. Based on a priori nesting of sampling stations into ecoregions, subregions, and habitats, analyses indicated most pronounced patchiness levels at finest (within transects among adjacent seabed photos) and largest (among ecoregions) spatial scale considered. Using an alternative approach, explicitly involving the spatial distances between the geo-referenced data, Moran’s Eigenvector mapping (MEM) classified the continuum of spatial scales into four categories: broad (> 60 km), meso (10–60 km), small (2–10 km), and fine (< 2 km). MEM analyses generally indicated an increase in mega-epibenthic community complexity with increasing spatial scale. Moreover, strong relationships between biota and environmental drivers were found at scales of > 2 km. In contrast, few environmental variables contributed to explaining biotic structures at finer scales. These are likely rather determined by nonmeasured environmental variables, as well as biological traits and interactions that are assumed to be most effective at small spatial scales.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Peer revision
ISI/Scopus peer-reviewed
Publication Status
Published
Eprint ID
49647
DOI 10.1002/lno.11187

Cite as
Gutt, J. , Arndt, J. , Kraan, C. , Dorschel, B. , Schröder, M. , Bracher, A. and Piepenburg, D. (2019): Benthic communities and their drivers: A spatial analysis off the Antarctic Peninsula , Limnology and Oceanography, 64 , pp. 2341-2357 . doi: 10.1002/lno.11187


Download
[img]
Preview
PDF
2019_Gutt_et_al.pdf

Download (2MB) | Preview

Share


Citation

Research Platforms

Campaigns


Actions
Edit Item Edit Item