Low-Oxygen Lifestyles

Chapman, Lauren J.

doi:10.1007/978-3-319-13362-1_2

Cited by 16 publications

(15 citation statements)

References 127 publications

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“…Nonetheless, the success of mormyrids in hypoxic swamps has never been examined through the lens of sensory information acquisition. The low RMR (1.42 mg O 2 h −1 ) and p crit‐MR (14.34 mmHg) of M. victoriae are both indicators of hypoxia tolerance common among many swamp‐dwelling species (Chapman, ; Chapman et al ., ; Melnychuk & Chapman, ). Marcusenius victoriae 's p crit‐EOD (15.14 mmHg) is not significantly different from its p crit‐MR and further supports the hypothesis that this population of fish consists of swamp specialists.…”

Section: Discussionmentioning

confidence: 99%

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Effects of hypoxia on aerobic metabolism and active electrosensory acquisition in the African weakly electric fish Marcusenius victoriae

Moulton

Chapman

Krahe

2020

Journal of Fish Biology

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Environmental hypoxia has effected numerous and well-documented anatomical, physiological and behavioural adaptations in fishes. Comparatively little is known about hypoxia's impacts on sensing because it is difficult to quantify sensory acquisition in vivo. Weakly electric fishes, however, rely heavily on an easily-measurable sensory modality-active electric sensing-whereby individuals emit and detect electric organ discharges (EODs). In this study, hypoxia tolerance of a mormyrid weakly electric fish, Marcusenius victoriae, was assessed by examining both its metabolic and EOD rates using a critical threshold (p crit ) paradigm. The routine metabolic rate was 1.42 mg O 2 h −1 , and the associated critical oxygen tension was 14.34 mmHg.Routine EOD rate was 5.68 Hz with an associated critical tension of 15.14 mmHg.These metabolic indicators of hypoxia tolerance measured in this study were consistent with those in previous studies on M. victoriae and other weakly electric fishes. Furthermore, our results suggest that some aerobic processes may be reduced in favour of maintaining the EOD rate under extreme hypoxia. These findings underscore the importance of the active electrosensory modality to these hypoxia-tolerant fish. K E Y W O R D Scritical threshold, electric organ discharge, Lake Victoria, Marcusenius victoriae, mormyrids, respirometry

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Section: Discussionmentioning

confidence: 99%

“…Hypoxia is a naturally occurring stressor in many aquatic environments, including tidal pools and dense wetlands (Chapman, ; Mandic et al ., ). It can result from poor water mixing, high rates of organic decomposition, limited light penetration into the water column or a confluence of these factors.…”

Section: Introductionmentioning

confidence: 99%

Effects of hypoxia on aerobic metabolism and active electrosensory acquisition in the African weakly electric fish Marcusenius victoriae

Moulton

Chapman

Krahe

2020

Journal of Fish Biology

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“…Divergence in traits across gradients of environmental stressors, especially stressors that are rapidly increasing as a result of human activities, are of particular interest as we try to understand consequences of anthropogenic perturbations on biodiversity (Barrett & Hendry, ). In aquatic systems, hypoxia, or low dissolved oxygen (DO), is a globally pervasive environmental stressor (Diaz, ) that requires water‐breathing aquatic organisms to move to zones of higher DO, improve mechanisms to maximize oxygen uptake from the water, reduce their metabolic rate and/or energetically expensive activities to reduce oxygen requirements, and/or use anaerobic metabolism to bridge the difference between aerobic capacity and metabolic demands (Chapman, ).…”

Section: Introductionmentioning

confidence: 99%

Male colour variation in a eurytopic African cichlid: the role of diet and hypoxia

McNeil

Friesen

Gray

et al. 2016

Biol. J. Linn. Soc.

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Species that cross strong environmental gradients are expected to face divergent selective pressures that can act on sexually-selected traits. In the present study, we examine the role of hypoxia and carotenoid availability in driving divergence in two sexually-selected traits, male colour and reproductive behaviour, in the African cichlid Pseudocrenilabrus multicolor victoriae. Low-dissolved oxygen (DO) (hypoxic) environments are expected to be energetically challenging; given that male nuptial colour expression and courtship displays can be costly, we expected fish in low-DO versus high-DO environments to differ in these traits. First, a field survey was used to describe natural variation in male nuptial colour patterns and diet across habitats divergent in DO. Next, using wild-caught fish from a low-DO and high-DO habitat, we tested for differences in reproductive behaviour. Finally, a laboratory rearing experiment was used to quantify the interaction of DO and diet (low-versus high-carotenoid availability) on the expression of male colour during development. In energetically challenging low-DO environments, fish were more red and, in high-DO environments, fish were typically brighter and more yellow. The frequency of reproductive displays in fish of low-DO origin was 75% lower, although this had no consequence for brooding frequency (i.e. both populations produced the same number of broods on average). Our laboratory rearing study showed carotenoid availability to be important in colour production with no direct influence of DO on colour. Additionally, weak patterns of diet variation across wild populations suggest that other factors in combination with diet are contributing to colour divergence.

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“…Nonetheless, even these nuanced changes in DO were associated with several prominent shifts in life-history traits: both males and females drastically reduced their investment into reproduction under elevated oxygen concentrations, with lower GSI in males and lower fecundity, superfetation, MI and RA in females, while embryo fat content was increased. While the evolutionary effects of hypoxic conditions have been studied in several species of fish (Chapman, 2015), a few studies have directly investigated the effects of smaller, more gradual differences in DO. Similar to our results, DO and fecundity were inversely correlated in G. holbrooki from rice fields in Portugal (Cabral & Marques, 1999), whereas high-oxygen levels appear to be linked to an increased fecundity in G. hubbsi (Riesch et al, 2015).…”

Section: Effects Of Do Food Availability and Phmentioning

confidence: 99%

“…Prediction 4 (oxygen-effect): We predict low-oxygen conditions to be associated with larger head and gill regions to facilitate oxygen acquisition (Chapman, 2015) and potentially also with reduced fecundity (Riesch et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Phenotypic differentiation in a heterogeneous environment: morphological and life‐history responses to ecological gradients in a livebearing fish

et al. 2019

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Predicting how environmental variation drives phenotypic diversification is one of the main aims of evolutionary ecology. Yet, we still only have a limited understanding of how it drives diversity, especially when multiple factors interact. To address this issue, the superfetating livebearing fish Phalloptychus januarius (Poeciliidae) was repeatedly sampled (over a 2-year period) in four coastal lagoons in Brazil to investigate the relative contribution of different environmental factors on phenotypic patterns. We further compare our results to those reported for another poeciliid (Poecilia vivipara), which inhabits some of the same lagoons but has a drastically different reproductive strategy (no superfetation). We used a model-averaging approach to estimate the relative importance of differences in predation pressure, salinity, dissolved oxygen, pH, temperature and food availability in driving variation in body shape, life histories, and life-history proxies. We found consistent population differences in several traits, but also seasonal variation within each lagoon. Specifically, predation, oxygen availability and pH affected several different traits and played important roles in driving phenotypic differences between and amongst populations. Moreover, our study reveals differential responses in phenotypic traits to the same environmental gradients between P. januarius (this study) and P. vivipara (previous studies), and we suggest that future work should further investigate differential phenotypic responses to single versus multiple concomitant selective forces, and how this affects different species.

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Low-Oxygen Lifestyles

Cited by 16 publications

References 127 publications

Effects of hypoxia on aerobic metabolism and active electrosensory acquisition in the African weakly electric fish Marcusenius victoriae

Effects of hypoxia on aerobic metabolism and active electrosensory acquisition in the African weakly electric fish Marcusenius victoriae

Male colour variation in a eurytopic African cichlid: the role of diet and hypoxia

Phenotypic differentiation in a heterogeneous environment: morphological and life‐history responses to ecological gradients in a livebearing fish

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