Efficiencies and costs of larval growth in different food environments (Asteroidea: Asterina miniata)

Pace, Douglas A.; Manahan, Donal T.

doi:10.1016/j.jembe.2007.09.005

Cited by 26 publications

(19 citation statements)

References 47 publications

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“…3). The value we report of 2.4 J/mg protein synthesized is within the range of published values for protein synthesis costs in animals (18,(31)(32)(33)(34)(35)(36). The integrative analysis of biochemical and physiological processes we present in this study permits the calculation of stage-specific ATP allocation to protein synthesis during sea urchin development (Fig.…”

Section: Biochemical Rate Compensation Under Acidificationsupporting

confidence: 83%

Experimental ocean acidification alters the allocation of metabolic energy

Pan

Applebaum

Manahan

2015

Proc. Natl. Acad. Sci. U.S.A.

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270

207

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Energy is required to maintain physiological homeostasis in response to environmental change. Although responses to environmental stressors frequently are assumed to involve high metabolic costs, the biochemical bases of actual energy demands are rarely quantified. We studied the impact of a near-future scenario of ocean acidification [800 μatm partial pressure of CO 2 (pCO 2 )] during the development and growth of an important model organism in developmental and environmental biology, the sea urchin Strongylocentrotus purpuratus. Size, metabolic rate, biochemical content, and gene expression were not different in larvae growing under control and seawater acidification treatments. Measurements limited to those levels of biological analysis did not reveal the biochemical mechanisms of response to ocean acidification that occurred at the cellular level. In vivo rates of protein synthesis and ion transport increased ∼50% under acidification. Importantly, the in vivo physiological increases in ion transport were not predicted from total enzyme activity or gene expression. Under acidification, the increased rates of protein synthesis and ion transport that were sustained in growing larvae collectively accounted for the majority of available ATP (84%). In contrast, embryos and prefeeding and unfed larvae in control treatments allocated on average only 40% of ATP to these same two processes. Understanding the biochemical strategies for accommodating increases in metabolic energy demand and their biological limitations can serve as a quantitative basis for assessing sublethal effects of global change. Variation in the ability to allocate ATP differentially among essential functions may be a key basis of resilience to ocean acidification and other compounding environmental stressors.ocean acidification | sea urchin | energetics | metabolic allocation | development

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Section: Biochemical Rate Compensation Under Acidificationsupporting

confidence: 83%

Experimental ocean acidification alters the allocation of metabolic energy

Pan

Applebaum

Manahan

2015

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

270

207

View full text Add to dashboard Cite

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“…In particular, variation in food availability and food quality may contribute to physiological variation among individuals [64]. Within our two study sites, previous work offered strong evidence that changing food availability can contribute as much or more than temporal temperature variation to shifts in the mean activities of both ATP-generating and antioxidant enzymes [43].…”

Section: (C) Variation In Environmental Factors Other Than Temperaturementioning

confidence: 76%

Micro-scale environmental variation amplifies physiological variation among individual mussels

et al. 2015

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The contributions of temporal and spatial environmental variation to physiological variation remain poorly resolved. Rocky intertidal zone populations are subjected to thermal variation over the tidal cycle, superimposed with micro-scale variation in individuals' body temperatures. Using the sea mussel (Mytilus californianus), we assessed the consequences of this microscale environmental variation for physiological variation among individuals, first by examining the latter in field-acclimatized animals, second by abolishing micro-scale environmental variation via common garden acclimation, and third by restoring this variation using a reciprocal outplant approach. Common garden acclimation reduced the magnitude of variation in tissuelevel antioxidant capacities by approximately 30% among mussels from a wave-protected (warm) site, but it had no effect on antioxidant variation among mussels from a wave-exposed (cool) site. The field-acclimatized level of antioxidant variation was restored only when protected-site mussels were outplanted to a high, thermally stressful site. Variation in organismal oxygen consumption rates reflected antioxidant patterns, decreasing dramatically among protected-site mussels after common gardening. These results suggest a highly plastic relationship between individuals' genotypes and their physiological phenotypes that depends on recent environmental experience. Corresponding context-dependent changes in the physiological meanvariance relationships within populations complicate prediction of responses to shifts in environmental variability that are anticipated with global change.

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“…Numerous studies on bivalves have explored genetic effects on larval performance using either experimentally produced full or halfsib families (Innes and Haley 1977;Hilbish et al 1993), selected breeding lines (Taris et al 2007;Curole et al 2010), or distinct populations (Eierman and Hare 2013). In the best-studied bivalve taxon (oysters), we are beginning to understand both the physiological basis of variation in environmental tolerance (Pace et al 2006;Pace and Manahan 2007;Tamayo et al 2014) and the specific genes involved (Hedgecock et al 2007). …”

Section: Introductionmentioning

confidence: 99%