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1. Global patterns in copepod thermal tolerance

   https://doi.org/10.1093/plankt/fbab044  

   Sasaki, Matthew; Dam, Hans G (July 2021, Journal of Plankton Research)

   Abstract Copepods are key components of aquatic habitats across the globe. Understanding how they respond to warming is important for predicting the effects of climate change on aquatic communities. Lethal thermal limits may play an important role in determining responses to warming. Thermal tolerance can vary over several different spatial and temporal scales, but we still lack a fundamental understanding of what drives the evolution of these patterns in copepods. In this Horizons piece, we provide a synthesis of global patterns in copepod thermal tolerance and potential acclimatory capacities. Copepod thermal tolerance increases with maximum annual temperature. We also find that the effects of phenotypic plasticity on thermal tolerance are negatively related to the magnitude of thermal tolerance, suggesting a potential trade-off between these traits. Our ability to fully describe these patterns is limited, however, by a lack of spatial, temporal and phylogenetic coverage in copepod thermal tolerance data. We indicate several priority areas for future work on copepod thermal tolerance, and accompanying suggestions regarding experimental design and methodology. 

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2. Bioaccumulation of methylmercury in a marine copepod

   https://doi.org/10.1002/etc.3660  

   Lee, Cheng‐Shiuan; Fisher, Nicholas_S (December 2016, Environmental Toxicology and Chemistry)

   Abstract Methylmercury (MeHg) is known to biomagnify in marine food chains, resulting in higher concentrations in upper trophic level animals than their prey. To better understand how marine copepods, an important intermediate between phytoplankton and forage fish at the bottom of the food chain, assimilate and release MeHg, the authors performed a series of laboratory experiments using the gamma‐emitting radiotracer²⁰³Hg²⁺and Me²⁰³Hg with the calanoid copepodAcartia tonsa. Assimilation efficiencies of Hg²⁺and MeHg ranged from 25% to 31% and 58% to 79%, respectively, depending on algal diets. Assimilation efficiencies were positively related to the fraction of Hg in the cytoplasm of the algal cells that comprised their diet. Efflux rates of Hg²⁺(0.29/d) and MeHg (0.21/d) following aqueous uptake were similar, but efflux rates following dietary uptake were significantly lower for MeHg (0.11–0.22/d) than Hg²⁺(0.47–0.66/d). The calculated trophic transfer factors in copepods were >1 for MeHg and consistently low (≤0.2) for Hg²⁺. The authors used the parameters measured to quantitatively model the relative importance of MeHg sources (water or diet) for copepods and to predict the overall MeHg concentrations in copepods in different marine environments. In general, MeHg uptake from the diet accounted for most of the body burden in copepods (>50%). For an algal diet with a MeHg dry weight bioconcentration factor ≥10⁶, >90% of a copepod's MeHg body burden can be shown to derive from the diet. The model‐predicted MeHg concentrations in the copepods were comparable to independent measurements for copepods in coastal and open‐ocean regions, implying that the measured parameters and model are applicable to natural waters.Environ Toxicol Chem2017;36:1287–1293. © 2016 SETAC 

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3. Diel metabolic patterns in a migratory oceanic copepod

   https://doi.org/10.1016/j.jembe.2021.151643  

   Tarrant, Ann M.; McNamara-Bordewick, Nora; Blanco-Bercial, Leocadio; Miccoli, Andrea; Maas, Amy E. (December 2021, Journal of Experimental Marine Biology and Ecology)

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4. Capital Breeding in a Diapausing Copepod: A Transcriptomics Analysis

   https://doi.org/10.3389/fmars.2020.00056  

   Roncalli, Vittoria; Cieslak, Matthew C.; Hopcroft, Russell R.; Lenz, Petra H. (March 2020, Frontiers in Marine Science)
5. Evolutionary origins of genomic adaptations in an invasive copepod

   https://doi.org/10.1038/s41559-020-1201-y  

   Stern, David Ben; Lee, Carol Eunmi (August 2020, Nature Ecology & Evolution)

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