Biophysical patterns in benthic assemblage composition across contrasting continental margins off New Zealand
Article first published online: 4 SEP 2012
© 2012 Blackwell Publishing Ltd
Journal of Biogeography
Volume 40, Issue 1, pages 75–89, January 2013
How to Cite
Compton, T. J., Bowden, D. A., Roland Pitcher, C., Hewitt, J. E. and Ellis, N. (2013), Biophysical patterns in benthic assemblage composition across contrasting continental margins off New Zealand. Journal of Biogeography, 40: 75–89. doi: 10.1111/j.1365-2699.2012.02761.x
- Issue published online: 17 DEC 2012
- Article first published online: 4 SEP 2012
- New Zealand Government
- Land Information New Zealand
- Ministry of Fisheries
- National Institute of Water and Atmospheric Research Ltd
- Department of Conservation. Grant Number: IMF10-408
- Beta diversity;
- biodiversity mapping;
- conservation planning;
- continental shelf;
- continental slope;
- marine biogeography;
- random forest;
- spatial planning
To examine whether benthic assemblages are more diverse in a region of high topographic and oceanographic complexity by comparing benthic invertebrate assemblages across continental margins with contrasting environments.
Challenger Plateau and Chatham Rise, to the west and east of New Zealand, respectively.
Benthic faunal data were sourced from extensive seabed surveys in 2007, when both margins were sampled with an epibenthic sled and a towed video system. Three methods were used to investigate benthic assemblages in relation to environmental variables: one based on individual species distribution models (SDMs) using boosted regression trees analysis (BRT), and two community-based modelling methods using generalized dissimilarity modelling (GDM) and gradient forest analysis (GF), respectively. Each method was used to model and predict the turnover in assemblages with respect to environment – the ‘biophysical patterns’ – across the study region.
Across Chatham Rise, a complex oceanographic environment arising from steep gradients in productivity and temperature at the Subtropical Front produced a high diversity of assemblages associated with the sub-Antarctic water mass, the Subtropical Front, steep-sloping regions and fast tidal currents. In contrast, Challenger Plateau lies entirely beneath a single (subtropical) water mass, and assemblage diversity was lower, with a distinctive assemblage on the plateau itself and a deep-water assemblage similar to the northern deep-water assemblage of Chatham Rise. Across both regions, assemblage turnover was fastest in cold waters, at shallow depths and in deep mixed layers.
Benthic assemblages were more varied on Chatham Rise than on Challenger Plateau, supporting the hypothesis that environmentally heterogeneous margins have higher assemblage diversity. Differing assemblages on the northern and southern flanks of Chatham Rise suggest a biogeographical boundary for benthic taxa across the Subtropical Front. These results demonstrate that oceanographically and topographically complex margins have a diverse assemblage structure that should be considered in planning for the sustainable management of diversity.