Beta Diversity of Antarctic and Sub-Antarctic Benthic Communities Reveals a Major Role of Stochastic Assembly Processes
Community assembly is the result of both, deterministic and stochastic processes. The former encompasses niche-based local-scale mechanisms such as environmental filtering and biotic interactions; the latter includes ecological drift, probabilistic colonisation, and random extinctions. Using standar...
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ftdoajarticles:oai:doaj.org/article:f188f015ef9f4c6cbfe2ff93ccc568ab 2023-05-15T13:44:03+02:00 Beta Diversity of Antarctic and Sub-Antarctic Benthic Communities Reveals a Major Role of Stochastic Assembly Processes Nelson Valdivia José Garcés-Vargas Ignacio Garrido Iván Gómez Pirjo Huovinen Nelso P. Navarro Erasmo C. Macaya Luis Miguel Pardo 2021-12-01T00:00:00Z https://doi.org/10.3389/fmars.2021.780268 https://doaj.org/article/f188f015ef9f4c6cbfe2ff93ccc568ab EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2021.780268/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2021.780268 https://doaj.org/article/f188f015ef9f4c6cbfe2ff93ccc568ab Frontiers in Marine Science, Vol 8 (2021) neutral drift niche null models physiology priority effects spatial scale Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2021 ftdoajarticles https://doi.org/10.3389/fmars.2021.780268 2022-12-31T07:20:21Z Community assembly is the result of both, deterministic and stochastic processes. The former encompasses niche-based local-scale mechanisms such as environmental filtering and biotic interactions; the latter includes ecological drift, probabilistic colonisation, and random extinctions. Using standardised sampling protocols, we show that the spatial variation in species composition (beta diversity) of shallow subtidal macrobenthic communities of sub-Antarctic (Strait of Magellan and Yendegaia Fjord [Beagle Channel]) and Antarctic (Fildes Bay [King George Island, West Antarctic Peninsula]) localities reflects a high contribution of stochastic processes to community assembly. Null model analyses indicated that random sampling from species pools of different sizes drove the observed among-locality differences in incidence- and abundance-based beta diversity. We analysed a normalised stochasticity ratio (NST), which delimits between more deterministic (<50%) and more stochastic (>50%) assembly. NST was notably larger than 50%, with mean values of 69.5% (95% CI = 69.2–69.8%), 62.5% (62.1–62.9%), and 72.8% (72.5–73.2%) in Strait of Magellan, Yendegaia Fjord, and Fildes Bay, respectively. Accordingly, environmental factors, such as depth, seawater temperature, salinity, and underwater light penetration, accounted for a small fraction of the spatial variation in community composition across the three localities. In this region, therefore, stochastic processes could have stronger effects on community assembly than deterministic niche-based factors. As anthropogenic biotic homogenisation continues apace, our study can give useful insights into the major ecological processes in Southern Ocean’ coastal marine communities. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula King George Island Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Antarctic Peninsula Fildes ENVELOPE(-58.817,-58.817,-62.217,-62.217) King George Island Southern Ocean Frontiers in Marine Science 8 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
neutral drift niche null models physiology priority effects spatial scale Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
neutral drift niche null models physiology priority effects spatial scale Science Q General. Including nature conservation geographical distribution QH1-199.5 Nelson Valdivia José Garcés-Vargas Ignacio Garrido Iván Gómez Pirjo Huovinen Nelso P. Navarro Erasmo C. Macaya Luis Miguel Pardo Beta Diversity of Antarctic and Sub-Antarctic Benthic Communities Reveals a Major Role of Stochastic Assembly Processes |
topic_facet |
neutral drift niche null models physiology priority effects spatial scale Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Community assembly is the result of both, deterministic and stochastic processes. The former encompasses niche-based local-scale mechanisms such as environmental filtering and biotic interactions; the latter includes ecological drift, probabilistic colonisation, and random extinctions. Using standardised sampling protocols, we show that the spatial variation in species composition (beta diversity) of shallow subtidal macrobenthic communities of sub-Antarctic (Strait of Magellan and Yendegaia Fjord [Beagle Channel]) and Antarctic (Fildes Bay [King George Island, West Antarctic Peninsula]) localities reflects a high contribution of stochastic processes to community assembly. Null model analyses indicated that random sampling from species pools of different sizes drove the observed among-locality differences in incidence- and abundance-based beta diversity. We analysed a normalised stochasticity ratio (NST), which delimits between more deterministic (<50%) and more stochastic (>50%) assembly. NST was notably larger than 50%, with mean values of 69.5% (95% CI = 69.2–69.8%), 62.5% (62.1–62.9%), and 72.8% (72.5–73.2%) in Strait of Magellan, Yendegaia Fjord, and Fildes Bay, respectively. Accordingly, environmental factors, such as depth, seawater temperature, salinity, and underwater light penetration, accounted for a small fraction of the spatial variation in community composition across the three localities. In this region, therefore, stochastic processes could have stronger effects on community assembly than deterministic niche-based factors. As anthropogenic biotic homogenisation continues apace, our study can give useful insights into the major ecological processes in Southern Ocean’ coastal marine communities. |
format |
Article in Journal/Newspaper |
author |
Nelson Valdivia José Garcés-Vargas Ignacio Garrido Iván Gómez Pirjo Huovinen Nelso P. Navarro Erasmo C. Macaya Luis Miguel Pardo |
author_facet |
Nelson Valdivia José Garcés-Vargas Ignacio Garrido Iván Gómez Pirjo Huovinen Nelso P. Navarro Erasmo C. Macaya Luis Miguel Pardo |
author_sort |
Nelson Valdivia |
title |
Beta Diversity of Antarctic and Sub-Antarctic Benthic Communities Reveals a Major Role of Stochastic Assembly Processes |
title_short |
Beta Diversity of Antarctic and Sub-Antarctic Benthic Communities Reveals a Major Role of Stochastic Assembly Processes |
title_full |
Beta Diversity of Antarctic and Sub-Antarctic Benthic Communities Reveals a Major Role of Stochastic Assembly Processes |
title_fullStr |
Beta Diversity of Antarctic and Sub-Antarctic Benthic Communities Reveals a Major Role of Stochastic Assembly Processes |
title_full_unstemmed |
Beta Diversity of Antarctic and Sub-Antarctic Benthic Communities Reveals a Major Role of Stochastic Assembly Processes |
title_sort |
beta diversity of antarctic and sub-antarctic benthic communities reveals a major role of stochastic assembly processes |
publisher |
Frontiers Media S.A. |
publishDate |
2021 |
url |
https://doi.org/10.3389/fmars.2021.780268 https://doaj.org/article/f188f015ef9f4c6cbfe2ff93ccc568ab |
long_lat |
ENVELOPE(-58.817,-58.817,-62.217,-62.217) |
geographic |
Antarctic Antarctic Peninsula Fildes King George Island Southern Ocean |
geographic_facet |
Antarctic Antarctic Peninsula Fildes King George Island Southern Ocean |
genre |
Antarc* Antarctic Antarctic Peninsula King George Island Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula King George Island Southern Ocean |
op_source |
Frontiers in Marine Science, Vol 8 (2021) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2021.780268/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2021.780268 https://doaj.org/article/f188f015ef9f4c6cbfe2ff93ccc568ab |
op_doi |
https://doi.org/10.3389/fmars.2021.780268 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
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1766196426635739136 |