Ocean acidification induces multi-generational decline in copepod naupliar production with possible conflict for reproductive resource allocation
By Susan C. Fitzer, Gary S. Caldwell, A. Close, A. Clare, R. Upstill‐Goddard, M. Bentley. 2012
133 citations recorded by the source corpus.
Climate change, including ocean acidification (OA), presents fundamental challenges to marine biodiversity and sustained ecosystem health. We determined reproductive response (measured as naupliar production), cuticle composition and stage specific growth of the copepod Tisbe battagliai over three generations at four pH conditions (pH 7.67, 7.82, 7.95, and 8.06). Naupliar production increased significantly at pH 7.95 compared with pH 8.06 followed by a decline at pH 7.82. Naupliar production at pH 7.67 was higher than pH 7.82. We attribute the increase at pH 7.95 to an initial stress response which was succeeded by a hormesis-like response at pH 7.67. A multi-generational modelling approach predicted a gradual decline in naupliar production over the next 100 years (equivalent to approximately 2430 generations). There was a significant growth reduction (mean length integrated across developmental stage) relative to controls. There was a significant increase in the proportion of carbon relative to oxygen within the cuticle as seawater pH decreased. Changes in growth, cuticle composition and naupliar production strongly suggest that copepods subjected to OA-induced stress preferentially reallocate resources towards maintaining reproductive output at the expense of somatic growth and cuticle composition. These responses may drive shifts in life history strategies that favour smaller brood sizes, females and perhaps later maturing females, with the potential to profoundly destabilise marine trophodynamics.
Subfields: Global and Planetary Change, Oceanography
View Paper: https://www.semanticscholar.org/paper/7c1a0b4f06044d0c1462a2dfafaae14d79dd48e9
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In Global and Planetary Change
In Oceanography
Citations in the corpus
- Appropriate pCO2 treatments in ocean acidification experiments (2013, background): “For example, maternal effects, plasticity, and evolution can all influence the extent to which local chemistry conditions affect different aspects of species biology (Dupont et al. 2012; Fitzer et al. 2012; Parker et al. 2012; Sunday et al. 2011; Collins and Bell 2004).”