Population variation in hypoxic responses of the cichlid <i>Pseudocrenilabrus multicolor victoriae</i>

Martínez, Mery Liliana López; Chapman, Lauren J.; Rees, B.

doi:10.1139/z09-002

Cited by 28 publications

(21 citation statements)

References 26 publications

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“…Adaptive potential of fish populations to variations in water temperature has been widely investigated to predict the consequences of climate change on fish populations' viability (Beacham & Murray, 1985, 1986Hendry et al, 1998;Haugen & Vollestad, 2000;Jensen et al, 2008). However, few studies investigated the evolutionary potential of populations to lower levels of DO (Crispo & Chapman, 2008, 2011Martinez et al, 2009). These studies were all carried out on African cichlids while hypoxia is also an important stress for fish from the northern hemisphere (Shields & Knight, 2011).…”

Section: Introductionmentioning

confidence: 99%

Population differences in response to hypoxic stress in Atlantic salmon

Côte

Roussel

Cam

et al. 2012

J of Evolutionary Biology

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Understanding whether populations can adapt to new environmental conditions is a major issue in conservation and evolutionary biology. Aquatic organisms are increasingly exposed to environmental changes linked with human activities in river catchments. For instance, the clogging of bottom substratum by fine sediments is observed in many rivers and usually leads to a decrease in dissolved oxygen concentrations in gravel beds. Such hypoxic stress can alter the development and even be lethal for Atlantic salmon (Salmo salar) embryos that spend their early life into gravel beds. In this study, we used a common garden experiment to compare the responses to hypoxic stress of four genetically differentiated and environmentally contrasted populations. We used factorial crossing designs to measure additive genetic variation of early life-history traits in each population. Embryos were reared under normoxic and hypoxic conditions, and we measured their survival, incubation time and length at the end of embryonic development. Under hypoxic conditions, embryos had a lower survival and hatched later than in normoxic conditions. We found different hypoxia reaction norms among populations, but almost no population effect in both treatments. We also detected significant sire 9 treatment interactions in most populations and a tendency for heritability values to be lower under stressful conditions. Overall, these results reveal a high degree of phenotypic plasticity in salmon populations that nevertheless differ in their adaptive potential to hypoxia given the distinct reaction norms observed between and within populations.

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Section: Introductionmentioning

confidence: 99%

Population differences in response to hypoxic stress in Atlantic salmon

Côte

Roussel

Cam

et al. 2012

J of Evolutionary Biology

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“…These adaptations can be physiological (e.g. anaerobic respiration, higher haematocrit; Cooper et al 2002;Martínez et al 2004Martínez et al , 2009, behavioral (e.g. increased use of aquatic surface respiration; Chapman and Liem 1995;Timmerman and Chapman 2004), or morphological (e.g.…”

Section: Introductionmentioning

confidence: 99%

Hypoxia drives plastic divergence in cichlid body shape

Crispo

Chapman

2010

Evol Ecol

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Organisms experience multiple selective agents that can influence phenotypes through heritable and/or plastic changes, often reflecting complex interactions between phenotype and environment. Environmental factors can directly influence phenotypes, but also indirectly affect phenotypic variation when genetic/plastic change in one trait results in correlated genetic/plastic change in another trait. In fishes, body shape is a trait that might be particularly prone to influence from environmental pressures that act on other morphological features. Variation in dissolved oxygen among aquatic environments has a large impact on the size of the gills and brains of fishes. It is likely that dissolved oxygen interacts with other environmental factors to both directly and indirectly influence patterns of body shape variation. We examined effects of dissolved oxygen on body shape variation among populations of an African cichlid fish (Pseudocrenilabrus multicolor) from multiple high-and low-oxygen sites within a single drainage in Uganda. A split-brood laboratory experiment was used to estimate plasticity of gill and brain size, and we used morphometric analyses to identify variation in body shape in F 1 offspring. Several analyses enabled us to identify genetic effects among populations, and effects of oxygen acting either directly on body shape or indirectly through its effects on gill and brain size. A large part of the variation in body shape was due to plastic variation in gill size associated with dissolved oxygen. Fish raised under low oxygen had deeper heads and shorter bodies, and this variation was driven by both direct effects of oxygen and indirect effects of gill size variation. Body shape variation in fishes should reflect interacting effects of multiple environmental factors that act directly or indirectly on morphology. Body shape might be particularly difficult to predict when phenotypes are plastic, because changes among populations would occur rapidly and be unrelated to genetic variation.

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“…Loss of oxygen in marine habitats may compress habitable areas for marine organisms (Gallo & Levin, ). This can lead to divergent selection of tolerant genotypes that have better fitness to the prevailing extremes in the habitat (Sultan & Spencer, ; Tobler et al, ), and in favor of physiological tolerance to hypoxia (Chapman, Galis, & Shinn, ; Martinez, Chapman, & Rees, ), and local adaptation. The remarkable hypoxia and anoxia tolerance of S. bibarbatus (Salvanes et al, ; Utne‐Palm et al, ), and also ability to tolerate sulphide shocks (Currie et al, ; Salvanes et al, ), indicate that low bottom oxygen concentration does not limit the distribution and reproduction of S. bibarbatus (Salvanes et al, ; Seivåg et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…The remarkable hypoxia and anoxia tolerance of S. bibarbatus (Salvanes et al, 2015;Utne-Palm et al, 2010), and also ability to tolerate sulphide shocks (Currie et al, 2018;Salvanes et al, 2011), indicate that low bottom oxygen concentration does not limit the distribution and reproduction of S. bibarbatus Seivåg et al, 2016). Some genetic studies of other fish species have shown that long term adaptive response to hypoxia is reflected in gene expression (van der Meer et al, 2005), which in turn can be expressed as physiological and biochemical adaptation (Chapman et al, 2000;Martinez et al, 2009). The present findings are unable to confirm the genetic basis for adaptation to hypoxia in S. bibarbatus, but the study system provides a unique opportunity to investigate the matter using targeted genetic approaches.…”

Section: Loss Of Oxygen In Marine Habitats May Compress Habitable Areasmentioning

confidence: 99%

Genetic structure ofSufflogobius bibarbatusin the Benguela upwelling ecosystem using microsatellite markers

et al. 2020

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The bearded goby Sufflogobius bibarbatus is an abundant endemic small fish species on the continental shelf of the northern Benguela. The goby habitat is characterised by generally low bottom oxygen concentrations that vary spatially and seasonally. In the present study of population structure, 13 samples of S. bibarbatus from inner and outer shelf areas between 19°S and 32°S were screened using ten microsatellite loci. The genetic data were analysed in relation to isolation by distance and depth. Furthermore, for the first time, this study examined genetic data in relation to bottom oxygen concentration at the sampling locations. The data show low but significant genetic heterogeneity (G‐test; FST = 0.007, p < .05). There was weak but significant genetic differentiation along a latitudinal gradient across all sampling sites from 19.50°S to 32.37°S (Mantel test; r = .464, p = .001), but this disappeared when the southernmost sample was removed. On the other hand, a positive correlation of bottom oxygen concentration with pairwise FST (r = .336; p = .017) was observed among the sampling sites from the Northern Benguela shelf area. Overall, the data are complex but suggest that isolation by distance and bottom oxygen concentration may play a role in the genetic structuring of S. bibarbatus. The findings are discussed in relation to the species’ life history features and oceanographic characteristics of the Benguela upwelling ecosystem.

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Population variation in hypoxic responses of the cichlid Pseudocrenilabrus multicolor victoriae

Cited by 28 publications

References 26 publications

Population differences in response to hypoxic stress in Atlantic salmon

Population differences in response to hypoxic stress in Atlantic salmon

Hypoxia drives plastic divergence in cichlid body shape

Genetic structure ofSufflogobius bibarbatusin the Benguela upwelling ecosystem using microsatellite markers

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