Acidification increases sensitivity to hypoxia in important forage fishes
| Autor: | Denise L. Breitburg, Rebecca B. Burrell, Andrew G. Keppel, Seth H. Miller |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Ecology biology 010604 marine biology & hydrobiology Hypoxia (environmental) Estuary Aquatic Science biology.organism_classification Photosynthesis 01 natural sciences Predation Nutrient Menidia Respiration Low dissolved oxygen Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences |
| Zdroj: | Marine Ecology Progress Series. 549:1-8 |
| ISSN: | 1616-1599 0171-8630 |
| DOI: | 10.3354/meps11695 |
| Popis: | Hypoxia (low dissolved oxygen [DO]) and CO2-induced acidification are important aquatic stressors that are exacerbated by anthropogenic nutrient inputs and are expected to increase in severity with increasing atmospheric CO2 and higher global temperatures. Understanding how species respond to changes in DO and pH is critical to predicting how climate change will affect estuarine ecosystems, including the extreme shallow margins of these systems, where factors such as respiration, photosynthesis, and tides create daily fluctuations of DO and pH, and strong correlations between the 2 stressors. To determine how acidification affects the sensitivity to hypoxia of 2 im portant forage fishes, the silversides Menidia menidia and M. beryllina, we recorded opercula ventilation rates, aquatic surface respiration (ASR, where fish breathe in the oxygenated surface layer during hypoxic events), and mortality as we lowered either DO or both DO and pH simultaneously. Fish subjected to low DO and low pH in the laboratory performed ASR and died at higher DO concentrations than fish subjected only to hypoxia. Additionally, fish beat their opercula slower, which may have contributed to the differences in ASR and mortality that we saw. These results indicate acidification can increase mortality under hypoxia not only directly but also indirectly by increasing vulnerability to predation during increased use of ASR. |
| Databáze: | OpenAIRE |
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