Trophic transfer of essential elements in the clownfish Amphiprion ocellaris in the context of ocean acidification

Abstract

Little information exists on the effects of ocean acidification (OA) on the digestive and post-digestive processes in marine fish. Here, we investigated OA impacts (Δ pH = 0.5) on the trophic transfer of select trace elements in the clownfish Amphiprion ocellaris using radiotracer techniques. Assimilation efficiencies of three essential elements (Co, Mn and Zn) as well as their other short-term and long-term kinetic parameters in juvenile clownfish were not affected by this experimental pH change. In complement, their stomach pH during digestion were not affected by the variation in seawater pH. Such observations suggest that OA impacts do not affect element assimilation in these fish. This apparent pCO2 tolerance may imply that clownfish have the ability to self-regulate pH shifts in their digestive tract, or that they can metabolically accommodate such shifts. Such results are important to accurately assess future OA impacts on diverse marine biota, as such impacts are highly species specific, complex, and may be modulated by species-specific metabolic processes.

Dietary Zn and the subsequent organotropism in fish: No influence of food quality, frequency of feeding and environmental conditions (pH and temperature)

“…These physiological changes may affect the distribution and concentration of Zn in body compartments and further investigations are needed to clarify this point. Concerning the potential effects of abiotic factors on Zn trophic transfer in fish, very few studies have been done to date with salinity (Ni et al, 2005), pH (Jacob et al, 2017) Liver Campenhout et al, 2007) pH and temperature (Pouil et al, in press) as influencing factors. Although some of these studies have highlighted significant effetcs of these parameters on Zn trophic transfer (Van Campenhout et al, 2007;Pouil et al, in press), to the best of our knowledge, only one study considered the potential effects of such parameters (i.e.…”

Glycolytic capacities depend on developmental stage in the clownfish Amphiprion ocellaris

“…Holt 2003, Sales & Janssens 2003, Olivotto et al 2003, 2005, 2011, Liew et al 2006, Avella et al 2007, Madhu et al 2012, Vargas-Abúndez et al 2019, challenging environmental conditions (e.g. Munday et al 2009, Hess et al 2015, Jacob et al 2017 and settlement mechanisms (e.g. Ochi 1985, Fisher et al 2000, 2005, Bellwood & Fisher 2001, Wright et al 2005, Hogan et al 2007, Dixson et al 2011.…”

A multifaceted assessment of the effects of polyethylene microplastics on juvenile gilthead seabreams (Sparus aurata)

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