Details:

Journal Title:
Biology Letters
Personal Author:
Gobler, Christopher J. ; Baumann, Hannes
Gobler, Christopher J. ; Baumann, Hannes Less -
NOAA Program & Office:
NOS (National Ocean Service)
Description:
There is increasing recognition that low dissolved oxygen (DO) and low pH conditions co-occur in many coastal and open ocean environments. Within temperate ecosystems, these conditions not only develop seasonally as temperatures rise and metabolic rates accelerate, but can also display strong diurnal variability, especially in shallow systems where photosynthetic rates ameliorate hypoxia and acidification by day. Despite the widespread, global co-occurrence of low pH and low DO and the likelihood that these conditions may negatively impact marine life, very few studies have actually assessed the extent to which the combination of both stressors elicits additive, synergistic or antagonistic effects in marine organisms. We review the evidence from published factorial experiments that used static and/or fluctuating pH and DO levels to examine different traits (e.g. survival, growth, metabolism), life stages and species across a broad taxonomic spectrum. Additive negative effects of combined low pH and low DO appear to be most common; however, synergistic negative effects have also been observed. Neither the occurrence nor the strength of these synergistic impacts is currently predictable, and therefore, the true threat of concurrent acidification and hypoxia to marine food webs and fisheries is still not fully understood. Addressing this knowledge gap will require an expansion of multi-stressor approaches in experimental and field studies, and the development of a predictive framework. In consideration of marine policy, we note that DO criteria in coastal waters have been developed without consideration of concurrent pH levels. Given the persistence of concurrent low pH–low DO conditions in estuaries and the increased mortality experienced by fish and bivalves under concurrent acidification and hypoxia compared with hypoxia alone, we conclude that such DO criteria may leave coastal fisheries more vulnerable to population reductions than previously anticipated.
Keywords:
[+]
Agricultural And Biological Sciences (miscellaneous) General Agricultural And Biological Sciences
Source:
Biology Letters, 12(5), 20150976
DOI:
https://doi.org/10.1098/rsbl.2015.0976
ISSN:
1744-9561;1744-957X;
Format:
PDF
Publisher:
The Royal Society
Document Type:
Journal Article
Funding:
Grant no. NA12NOS4780148
Rights Information:
Other
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:40fe6439fc0cc2a0fc30558d99ec37989f9abab9dacd2403fcf881874d0c4084
Download URL:
https://repository.library.noaa.gov/view/noaa/60288/noaa_60288_DS1.pdf
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