Deficit in digestive capabilities of bamboo shark early stages under climate change

Rosa, Rui; Pimentel, Marta S.; Galan, Juan G.; Baptista, Miguel; Lopes, Vanessa M.; Couto, Ana; Guerreiro, Miguel; Sampaio, Eduardo; Castro, Joana; Santos, Catarina; Calado, Ricardo; Repolho, Tiago

doi:10.1007/s00227-016-2840-z

Cited by 26 publications

(19 citation statements)

References 29 publications

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“…13: 20160796 were associated with H. ocellatum living in shallow reef and lagoon habitats that naturally experience variable CO 2 levels, which could confer them a certain degree of tolerance to projected future CO 2 concentrations. Contrary to these two studies that encompass acclimation periods varying between 30 and 60 days (table 1), other studies performed in recently hatched juveniles exposed to elevated CO 2 during the entire embryogenesis (more than 200 days of acclimation; table 1) observed significant changes in Fulton's condition index [32], aerobic potential (citrate synthase activity), peroxidative damage in the brain, cholinergic neurotransmission [33] and digestive enzyme activities [34], among other physiological variables. Most of these effects also exhibited significant interactions with elevated temperatures (figure 1).…”

Section: Physiologymentioning

confidence: 79%

“…The physiological effects of simulated end-of-century elevated CO 2 conditions have only been evaluated in four relatively sedentary, benthic species: the temperate lesserspotted (Scyliorhinus canicula) catshark [38] and Port Jackson (H. portusjacksoni) sharks [39,40] and the tropical bamboo (C. punctatum) [32][33][34] and epaulette (H. ocellatum) sharks [35,36] (table 1). Previous studies investigating physiological processes under elevated CO 2 in sharks have been conducted at very high CO 2 levels (.8-10 mm Hg, approximately 10 000-13 000 matm) (e.g.…”

Section: Physiologymentioning

confidence: 99%

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Biological responses of sharks to ocean acidification

2017

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Sharks play a key role in the structure of marine food webs, but are facing major threats due to overfishing and habitat degradation. Although sharks are also assumed to be at relatively high risk from climate change due to a low intrinsic rate of population growth and slow rates of evolution, ocean acidification (OA) has not, until recently, been considered a direct threat. New studies have been evaluating the potential effects of end-of-century elevated CO 2 levels on sharks and their relatives' early development, physiology and behaviour. Here, we review those findings and use a meta-analysis approach to quantify the overall direction and magnitude of biological responses to OA in the species of sharks that have been investigated to date. While embryo survival and development time are mostly unaffected by elevated CO 2 , there are clear effects on body condition, growth, aerobic potential and behaviour (e.g. lateralization, hunting and prey detection). Furthermore, studies to date suggest that the effects of OA could be as substantial as those due to warming in some species. A major limitation is that all past studies have involved relatively sedentary, benthic sharks that are capable of buccal ventilation—no studies have investigated pelagic sharks that depend on ram ventilation. Future research should focus on species with different life strategies (e.g. pelagic, ram ventilators), climate zones (e.g. polar regions), habitats (e.g. open ocean), and distinct phases of ontogeny in order to fully predict how OA and climate change will impact higher-order predators and therefore marine ecosystem dynamics.

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Section: Physiologymentioning

confidence: 79%

Section: Physiologymentioning

confidence: 99%

Biological responses of sharks to ocean acidification

2017

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“…In contrast to temperature, fewer studies investigated the influence of pH on the assimilation of metals by marine biota (Lacoue-Labarthe et al 2011;Götze et al 2014;Ivanina et al 2015), and to the best of our knowledge, even none has investigating the influence of pH on metal trophic transfer in fish. However, in the context of the current ocean acidification, some authors have recently highlighted the effects of the partial pressure of CO2 (pCO2) on the digestion of fish (Pimentel et al 2015;Rosa et al 2016). Indeed, these authors have shown that the activity of the digestive enzymes in marine fish is dependent of the pCO2.…”

Section: Discussionmentioning

confidence: 99%

“…However, few studies indicated that pH can alter the structure and functioning of the digestive tract (e.g. Frommel et al 2014), and even the digestive enzyme activities (Pimentel et al 2015;Rosa et al 2016) of early stages of marine fish.". The variation of temperature and pH may occur simultaneously, and organisms can be affected differently by them.…”

Section: Introductionmentioning

confidence: 99%

Investigations of temperature and pH variations on metal trophic transfer in turbot (Scophthalmus maximus)

Pouil

Oberhänsli

Bustamante

et al. 2017

Environ Sci Pollut Res

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Studying dietary metal transfer kinetics is essential to gain a better understanding in global metal accumulation rates and its impacts in marine fish. While there exists a solid understanding on the influence of various biotic factors on this transfer, metal assimilation in fish might be also affected by abiotic factors, as has been observed in marine invertebrates. The present study therefore aims to understand the potential effects of two climate-related master variables, temperature and pH, on the assimilation efficiency (AE) of essential (Co and Zn) and non-essential (Ag) metals in the turbot Scophthalmus maximus using radiotracer tools. Juvenile turbots were acclimated for 8 weeks at two temperatures (17 and 20 °C) and pH (7.5 and 8.0) regimes, under controlled laboratory conditions, and then fed with radiolabelled shrimp (Co, Zn andAg). Assimilation efficiencies of Co and Ag in juvenile turbot, determined after a 21-day depuration period, were not affected by pre-exposition to the different environmental conditions. In contrast, temperature did significantly influence Zn AE (p < 0.05), while pH variations did not affect the assimilation of any of the metals studied. In fact, temperature is known to affect gut physiology, specifically the membrane properties of anterior intestine cells where Zn is adsorbed and assimilated from the ingested food. These results are relevant to accurately assess the influence of abiotic factors in AEs of metals in fish as they are highly element-dependent and also modulated by metabolic processes.

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“…Recently, the scientific community started to investigate the effects that OA may have on sharks’ physiology and behavior (Green & Jutfelt, ; Heinrich et al, ; Rosa et al, ; Dixson, Jennings, Atema, & Munday, ; Heinrich et al, ; Pistevos, Nagelkerken, Rossi, Olmos, & Connell, ; Johnson, Kraver, Renshaw, & Rummer, ; Rosa, Pimentel, et al, ; Rosa, Ricardo, et al, ; Pistevos, Nagelkerken, Rossi, & Connell, ; Rosa, Rummer, & Munday, ; Lopes et al, ). Two studies have so far indicated the presence of compensation mechanisms in sharks exposed to OA.…”

Section: Introductionmentioning

confidence: 99%

Effects of elevated carbon dioxide on the hematological parameters of a temperate catshark

et al. 2019

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Atmospheric CO 2 levels have been rising due to an increase in anthropic activities and its implications over marine ecosystems are unprecedented. The present study focused on the effects of ocean acidification (OA) on key hematological parameters of the juvenile small-spotted catsharks (Scyliorhinus canicula). Eggs were reared throughout the entire embryogenesis (~4 months) plus 5 additional months, in two experimental treatments (control: pCO 2~4 00 μatm; and high CO 2 : pCO 2~9 00 μatm,

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Deficit in digestive capabilities of bamboo shark early stages under climate change

Cited by 26 publications

References 29 publications

Biological responses of sharks to ocean acidification

Biological responses of sharks to ocean acidification

Investigations of temperature and pH variations on metal trophic transfer in turbot (Scophthalmus maximus)

Effects of elevated carbon dioxide on the hematological parameters of a temperate catshark

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