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Predicted levels of future ocean acidification and temperature rise could alter community structure and biodiversity in marine benthic communities

Predicted levels of future ocean acidification and temperature rise could alter community structure and biodiversity in marine benthic communities
Predicted levels of future ocean acidification and temperature rise could alter community structure and biodiversity in marine benthic communities
A mesocosm experiment was conducted to quantify the effects of reduced pH and elevated temperature on an intact marine invertebrate community. Standardised faunal communities, collected from the extreme low intertidal zone using artificial substrate units, were exposed to one of eight nominal treatments (four pH levels: 8.0, 7.7, 7.3 and 6.7, crossed with two temperature levels: 12 and 16°C). After 60 days exposure communities showed significant changes in structure and lower diversity in response to reduced pH. The response to temperature was more complex. At higher pH levels (8.0 and 7.7) elevated temperature treatments contained higher species abundances and diversity than the lower temperature treatments. In contrast, at lower pH levels (7.3 and 6.7), elevated temperature treatments had lower species abundances and diversity than lower temperature treatments. The species losses responsible for these changes in community structure and diversity were not randomly distributed across the different phyla examined. Molluscs showed the greatest reduction in abundance and diversity in response to low pH and elevated temperature, whilst annelid abundance and diversity was mostly unaffected by low pH and was higher at the elevated temperature. The arthropod response was between these two extremes with moderately reduced abundance and diversity at low pH and elevated temperature. Nematode abundance increased in response to low pH and elevated temperature, probably due to the reduction of ecological constraints, such as predation and competition, caused by a decrease in macrofaunal abundance. This community-based mesocosm study supports previous suggestions, based on observations of direct physiological impacts, that ocean acidification induced changes in marine biodiversity will be driven by differential vulnerability within and between different taxonomical groups. This study also illustrates the importance of considering indirect effects that occur within multispecies assemblages when attempting to predict the consequences of ocean acidification and global warming on marine communities.
0030-1299
661-674
Hale, R.
e5dfde12-523c-4000-ad0e-3431ffeafac1
Calosi, P.
35797083-5a1b-4685-b4d1-508ee7aa6f16
McNeill, L.
6b7ea827-03ff-482b-a26e-481727e194ca
Mieszkowska, N.
4c91117c-a01f-46a6-81c7-68ef16cbd598
Widdicombe, S.
e8c8e515-277a-49c5-a0f7-7a0745b1746f
Hale, R.
e5dfde12-523c-4000-ad0e-3431ffeafac1
Calosi, P.
35797083-5a1b-4685-b4d1-508ee7aa6f16
McNeill, L.
6b7ea827-03ff-482b-a26e-481727e194ca
Mieszkowska, N.
4c91117c-a01f-46a6-81c7-68ef16cbd598
Widdicombe, S.
e8c8e515-277a-49c5-a0f7-7a0745b1746f

Hale, R., Calosi, P., McNeill, L., Mieszkowska, N. and Widdicombe, S. (2011) Predicted levels of future ocean acidification and temperature rise could alter community structure and biodiversity in marine benthic communities. Oikos, 120 (5), 661-674. (doi:10.1111/j.1600-0706.2010.19469.x).

Record type: Article

Abstract

A mesocosm experiment was conducted to quantify the effects of reduced pH and elevated temperature on an intact marine invertebrate community. Standardised faunal communities, collected from the extreme low intertidal zone using artificial substrate units, were exposed to one of eight nominal treatments (four pH levels: 8.0, 7.7, 7.3 and 6.7, crossed with two temperature levels: 12 and 16°C). After 60 days exposure communities showed significant changes in structure and lower diversity in response to reduced pH. The response to temperature was more complex. At higher pH levels (8.0 and 7.7) elevated temperature treatments contained higher species abundances and diversity than the lower temperature treatments. In contrast, at lower pH levels (7.3 and 6.7), elevated temperature treatments had lower species abundances and diversity than lower temperature treatments. The species losses responsible for these changes in community structure and diversity were not randomly distributed across the different phyla examined. Molluscs showed the greatest reduction in abundance and diversity in response to low pH and elevated temperature, whilst annelid abundance and diversity was mostly unaffected by low pH and was higher at the elevated temperature. The arthropod response was between these two extremes with moderately reduced abundance and diversity at low pH and elevated temperature. Nematode abundance increased in response to low pH and elevated temperature, probably due to the reduction of ecological constraints, such as predation and competition, caused by a decrease in macrofaunal abundance. This community-based mesocosm study supports previous suggestions, based on observations of direct physiological impacts, that ocean acidification induced changes in marine biodiversity will be driven by differential vulnerability within and between different taxonomical groups. This study also illustrates the importance of considering indirect effects that occur within multispecies assemblages when attempting to predict the consequences of ocean acidification and global warming on marine communities.

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Published date: May 2011
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 369753
URI: https://eprints.soton.ac.uk/id/eprint/369753
ISSN: 0030-1299
PURE UUID: a50d9046-d850-41c0-af64-fa85694d7233
ORCID for R. Hale: ORCID iD orcid.org/0000-0001-5079-5954

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Date deposited: 06 Oct 2014 12:51
Last modified: 05 Nov 2019 01:37

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Contributors

Author: R. Hale ORCID iD
Author: P. Calosi
Author: L. McNeill
Author: N. Mieszkowska
Author: S. Widdicombe

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