Hypoxia and seasonal temperature: Short-term effects and long-term implications for Acartia tonsa dana

Richmond, Courtney; Marcus, Nancy H.; Sedlacek, Christopher J.; Miller, Glenn A.; Oppert, Cris

doi:10.1016/j.jembe.2005.07.004

Cited by 67 publications

(52 citation statements)

References 39 publications

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“…Experiments in systems that experience seasonal bottom hypoxia have shown that hypoxia increases mortality and reduces growth of A. tonsa and other copepods (Marcus et al, 2004;Richmond et al, 2006;Stalder and Marcus, 1997). This is consistent with our results (Fig.…”

Section: Discussionsupporting

confidence: 93%

“…Production and growth rates of copepods in the HCS show high temporal and spatial variability and are controlled by temperature , food quality and quantity (Poulet et al, 2007;Torres and Escribano, 2003;Vargas et al, 2006), advection (Escribano, 1998), and upwelling intensity . Previous studies in other systems have shown that hypoxic conditions could negatively affect A. tonsa egg production, hatching success and survival (Marcus et al, 2004;Richmond et al, 2006) while other copepods and their different developmental stages, like Calanoides carinatus, are able to tolerate low DO concentrations (Auel and Verheye, 2007). Understanding how copepod growth and reproduction respond to stress and environmental variability would greatly improve our understanding of how populations and ecosystems function (Runge and Roff, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Egg production and hatching success of Calanus chilensis and Acartia tonsa in the northern Chile upwelling zone (23°S), Humboldt Current System

Ruz

Hidalgo

Yáñez

et al. 2015

Journal of Marine Systems

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Egg production and hatching success of Calanus chilensis and Acartia tonsa in the northern Chile upwelling zone (23°S), Humboldt Current System

Ruz

Hidalgo

Yáñez

et al. 2015

Journal of Marine Systems

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“…B 282: 20150690 developing young indirectly. Both developmental retardation and smaller sizes at emergence under hypoxia have been recorded in a copepod (Acartia tonsa [71]) showing that these mechanisms are not mutually exclusive.…”

Section: (B) Oxygenationmentioning

confidence: 99%

The evolutionary puzzle of egg size, oxygenation and parental care in aquatic environments

2015

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Offspring fitness generally improves with increasing egg size. Yet, eggs of most aquatic organisms are small. A common but largely untested assumption is that larger embryos require more oxygen than they can acquire through diffusion via the egg surface, constraining egg size evolution. However, we found no detrimental effects of large egg size on embryo growth and survival under hypoxic conditions. We tested this in the broad-nosed pipefish, Syngnathus typhle, whose males provide extensive care (nourishment, osmoregulation and oxygenation) to their young in a brood pouch on their bodies. We took advantage of this species' pronounced variation in egg size, correlating positively with female size, and tested the effect of hypoxia (40% dissolved oxygen) versus fully oxygenated (100%) water on embryo size and survival of large versus small eggs after 18 days of paternal brooding. Egg size did not affect embryo survival, regardless of O 2 treatment. While hypoxia affected embryo size negatively, both large and small eggs showed similar reductions in growth. Males in hypoxia ventilated more and males with large eggs swam more, but neither treatment affected their position in the water column. Overall, our results call into question the most common explanation for constrained egg size evolution in aquatic environments.

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“…Hypoxic conditions cause significant reductions in the survival and growth of mesozooplankton (Roman et al 1993, Richmond et al 2006. However, some microzooplankton, including several ciliate species, can persist under hypoxic conditions in both marine (e.g.…”

Section: Grazing Mortality Of Microbial Populationsmentioning

confidence: 99%

Grazing and virus-induced mortality of microbial populations before and during the onset of annual hypoxia in Lake Erie

Gobler¹,

Davis²,

Deonarine³

et al. 2008

Aquat. Microb. Ecol.

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Lake Erie is the most productive of the North American Great Lakes and experiences annual periods of hypolimnetic hypoxia with unknown consequences for the microbial food web. We established the abundances and mortality rates of microbes in Lake Erie during thermal stratification and determined how they varied with changes in bottom-water dissolved oxygen concentrations. The microbial plankton community (heterotrophic bacteria, Cyanobacteria, eukaryotic phytoplankton, nanozooplankton, microzooplankton) was quantified in surface and bottom waters along with measurements of herbivory and bacterivory rates on eukaryotic and prokaryotic picoplankton and rates of viral lysis of bacteria. High rates of grazing mortality of prokaryotic picoplankton (1.4 ± 0.6 d ) and significant correlations between microzooplankton abundances and all picoplankton populations quantified demonstrated the strong impacts of grazing on Lake Erie picoplanktonic communities. Microbial herbivory accounted for half of total phytoplankton mortality per day. Bacterivory and viral lysis turned over 85% of the heterotrophic bacterial community each day. During the onset of hypolimnetic hypoxia, abundances of ciliates and rotifers decreased significantly and herbivory was undetectable. Concurrently, bacterivory persisted at rates equal to those found in shallower oxygenated waters, and abundances of heterotrophic nanoflagellates did not change significantly. These results suggest that, during hypoxia events in Lake Erie, herbivory by microzooplankton is disrupted, but bacterivory by heterotrophic nanoflagellates persists. Finally, rates of viral lysis of heterotrophic bacteria were higher in the hypolimnion than in surface waters, suggesting that increased viral lysis may enhance regeneration of organic matter in bottom waters during hypoxic events.

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Hypoxia and seasonal temperature: Short-term effects and long-term implications for Acartia tonsa dana

Cited by 67 publications

References 39 publications

Egg production and hatching success of Calanus chilensis and Acartia tonsa in the northern Chile upwelling zone (23°S), Humboldt Current System

Egg production and hatching success of Calanus chilensis and Acartia tonsa in the northern Chile upwelling zone (23°S), Humboldt Current System

The evolutionary puzzle of egg size, oxygenation and parental care in aquatic environments

Grazing and virus-induced mortality of microbial populations before and during the onset of annual hypoxia in Lake Erie

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