Fish

Sébert, Philippe; Macdonald, A. G.

doi:10.1007/978-3-642-77115-6_5

Cited by 16 publications

(14 citation statements)

References 94 publications

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“…Such a mechanism also exists in cold-acclimated fish (Prosser, 1991). Moreover, it is well known that hydrostatic pressure has excitatory effects, which explains the high M02 previously found at the end of compression (Sebert & Macdonald, 1993). As shown in Fig.…”

Section: Discussionmentioning

confidence: 58%

“…Under physiological conditions it is impossible to differentiate between these two effects. However in 1985, Barthelemy showed that fish could be used as a model to study these effects: since they breathe water (see Sebert & Macdonald, 1993), they can be submitted to HP alone or in conjunction with an increase in gas pressure, thus allowing the specific effects of hydrostatic pressure to be studied. It is now generally accepted that high pressure neurological syndrome (HPNS) described in man and other mammals, is due to the effects of HP (Bennett, 1989) and that temperature changes can modify the intensity of the observed effects (Beaver & Brauer, 1981).…”

Section: Introductionmentioning

confidence: 99%

“…It is now generally accepted that high pressure neurological syndrome (HPNS) described in man and other mammals, is due to the effects of HP (Bennett, 1989) and that temperature changes can modify the intensity of the observed effects (Beaver & Brauer, 1981). The eel is generally used in such studies since it tolerates high pressure, in contrast to other fish species such as trout (see Sebert & Macdonald, 1993). The basic thermodynamic equations clearly show that pressure (or pressure variations) and temperature can induce opposite effects.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, when animals, irrespective of the species, are submitted to high pressure it is important to know what the effects of a concomitant temperature change could be. Many of the hydrostatic pressure effects described in shallow-water fish can be compared to what is observed when, at atmospheric pressure, water temperature is decreased (for review see Cossins & Macdonald, 1989;Sebert & Macdonald, 1993).…”

Section: Introductionmentioning

confidence: 99%

“…The results obtained are in agreement with an alteration of membrane fluidity and thus the function of enzymes, ionic pumps and channels, neurotransmitter release etc. (Sebert & Barthelemy, 1985;Sebert & Macdonald, 1993;Sebert, Simon & Barthelmy, 1993b). However, when fish are acclimated for 1 month to high hydrostatic pressure, they appear calm and their energy metabolism returns to normal (Simon, Sebert & Barthelemy, 1989), at least in part by restoration of membrane fluidity (Sebert, Cossins, Simon, Meskar & Barthelemy, 1993a).…”

Section: Introductionmentioning

confidence: 99%

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Effects of a temperature increase on oxygen consumption of yellow freshwater eels exposed to high hydrostatic pressure

Sébert¹,

Simon²,

Barthelemy³

1995

Experimental Physiology

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SUMMARYOxygen consumption was measured in yellow freshwater eels, Anguilla anguilla, during exposure to a hydrostatic pressure (HP) of 101 atmosphere absolute (ATA) for 3 h, either with or without a 5°C increase in water temperature. It was found that concomitant increases in temperature and pressure resulted in an increase in oxygen consumption that was lower than when pressure alone was increased. When eels were acclimated to HP for 21 days and then submitted to a temperature increase of 5°C, this induced a significant increase in oxygen consumption but only during the first hour. It is therefore concluded that raising the water temperature during the first hours under pressure could counterbalance the pressure effects on membrane fluidity in a thermodynamic manner and thus help shallow-water fish acclimate to high pressure. In contrast, when acclimation processes are ended, the temperature effect disappears within 1 h.

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Section: Discussionmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of a temperature increase on oxygen consumption of yellow freshwater eels exposed to high hydrostatic pressure

Sébert¹,

Simon²,

Barthelemy³

1995

Experimental Physiology

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The genomic basis of cichlid fish adaptation within the deepwater “twilight zone” of Lake Malawi

et al. 2017

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Deepwater environments are characterized by low levels of available light at narrow spectra, great hydrostatic pressure, and low levels of dissolved oxygen—conditions predicted to exert highly specific selection pressures. In Lake Malawi over 800 cichlid species have evolved, and this adaptive radiation extends into the “twilight zone” below 50 m. We use population‐level RAD‐seq data to investigate whether four endemic deepwater species (Diplotaxodon spp.) have experienced divergent selection within this environment. We identify candidate genes including regulators of photoreceptor function, photopigments, lens morphology, and haemoglobin, many not previously implicated in cichlid adaptive radiations. Colocalization of functionally linked genes suggests coadapted “supergene” complexes. Comparisons of Diplotaxodon to the broader Lake Malawi radiation using genome resequencing data revealed functional substitutions and signatures of positive selection in candidate genes. Our data provide unique insights into genomic adaptation within deepwater habitats, and suggest genome‐level specialization for life at depth as an important process in cichlid radiation.

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