Journal article
Ocean warming, but not acidification, accelerates seagrass decomposition under near-future climate scenarios
Marine ecology. Progress series (Halstenbek), Vol.605, pp.103-110
26/10/2018
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Source: InCites
Abstract
The majority of marine macrophyte production is not consumed by herbivores but instead is channeled into detrital pathways where it supports biodiversity and drives coastal productivity, nutrient cycling and blue carbon sequestration. While it is clear that detrital pathways will be affected by ocean climate change, the relative importance of changing temperature or pH, or their interactions, has not been assessed. We used outdoor mesocosm experiments to assess the relative importance of ocean warming, acidification and latitude of litter origin on the decomposition and biomechanical properties of seagrass Zostera muelleri. Seagrass, collected from 2 sites at each of 2 latitudes (29 degrees and 35 degrees S), was subjected to an orthogonal combination of current and predicted future ocean warming (+3 degrees C) and acidification (-0.3 pH unit). Elevated temperatures resulted in a 15% greater loss of seagrass detrital mass. Mass loss of seagrass detritus was also greater in seagrass from higher than from lower latitudes. The stiffness (Young's modulus) of decomposing seagrass was greater at 22 degrees C than at 25 degrees C. Elevated sea temperatures also weakened decomposing seagrass, but the magnitude of these effects was greater for Z. muelleri originating from higher than from lower latitudes. Overall, ocean warming is likely to have a much larger influence on seagrass decomposition than ocean acidification. As climate changes, however, if seagrass from higher latitudes takes on similar characteristics to seagrass currently growing at lower latitudes, there may be a negative feedback against the impacts of ocean warming on decomposition, moderating changes in associated primary and secondary productivity that supports coastal fisheries and ecosystem processes.
Details
- Title
- Ocean warming, but not acidification, accelerates seagrass decomposition under near-future climate scenarios
- Creators
- Brendan P. Kelaher - Southern Cross UniversityMelinda A. Coleman - Southern Cross UniversityMelanie J. Bishop - Macquarie University
- Publication Details
- Marine ecology. Progress series (Halstenbek), Vol.605, pp.103-110
- Publisher
- Inter-Research
- Number of pages
- 8
- Grant note
- LP12020228; DP1093444 / Australian Research Council
- Identifiers
- 991013098095102368
- Copyright
- Copyright © 2018 Inter-Research.
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article