Hydrogen sulfide exposure reduces thermal set point in zebrafish

Skandalis, Dimitri A.; Dobell, Cheryl D; Shaw, Joshua C; Tattersall, Glenn J.

doi:10.1098/rsos.200416

Cited by 7 publications

(2 citation statements)

References 40 publications

(94 reference statements)

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“…Hypoxia and H 2 S elicit similar physiological and behavioral responses in fishes (Bagarinao, 1992) and through interactions with temperature induce even greater stress than reported for either stressor separately (Gee et al, 1978;Kramer and Mehegan, 1981;Skandalis et al, 2020). Our observations suggest diurnal fluctuations in DO concentration are a dominant factor driving the observed changes in fish's diving behavior and associated ASR tendency.…”

Section: Discussionsupporting

confidence: 61%

Diurnal Changes in Hypoxia Shape Predator-Prey Interaction in a Bird-Fish System

et al. 2021

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Animals often face changing environments, and behavioral flexibility allows them to rapidly and adaptively respond to abiotic factors that vary more or less regularly. However, abiotic factors that affect prey species do not necessarily affect their predators. Still, the prey’s response might affect the predator indirectly, yet evidence from the wild for such a classical bottom-up effect of abiotic factors shaping several trophic levels remains sparse. In many aquatic environments, daily changes in oxygen concentrations occur frequently. When oxygen levels drop to hypoxic levels, many fishes respond with aquatic surface respiration (ASR), during which they obtain oxygen by skimming the upper, oxygenated surface layer. By increasing time at the surface, fish become more vulnerable to fish-eating birds. We explored these cascading effects in a sulfidic spring system that harbors the endemic sulphur molly (Poecilia sulphuraria) as prey species and several fish-eating bird species. Sulfide-rich springs pose harsh conditions as hydrogen sulfide (H2S) is lethal to most metazoans and reduces dissolved oxygen (DO). Field sampling during three daytimes indicated that water temperatures rose from morning to (after)noon, resulting in the already low DO levels to decrease further, while H2S levels showed no diurnal changes. The drop in DO levels was associated with a decrease in time spent diving in sulphur mollies, which corresponded with an increase in ASR. Interestingly, the laboratory-estimated threshold at which the majority of sulphur mollies initiate ASR (ASR50: <1.7 mg/L DO) was independent of temperature and this value was exceeded daily when hypoxic stress became more severe toward noon. As fish performed ASR, large aggregations built up at the water surface over the course of the day. As a possible consequence of fish spending more time at the surface, we found high activity levels of fish-eating birds at noon and in the afternoon. Our study reveals that daily fluctuations in water’s oxygen levels have the potential to alter predator-prey interactions profoundly and thus highlights the joined actions of abiotic and biotic factors shaping the evolution of a prey species.

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Section: Discussionsupporting

confidence: 61%

Diurnal Changes in Hypoxia Shape Predator-Prey Interaction in a Bird-Fish System

et al. 2021

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“…For example, while high nitrate levels can reduce swimming speed and duration in juvenile silver perch, Bidyanus bidyanu (Mitchell, 1838), the effects can depend on or be masked by changes in temperature (Isaza et al ., 2020). Other environmental toxins can impact the preferred temperatures of fish (Petersen & Steffensen, 2003; Skandalis et al ., 2020).…”

Section: Towards a More Refined Understanding Of Pementioning

confidence: 99%

Physical enrichment research for captive fish: Time to focus on the DETAILS

Jones

Webster

Salvanes

2021

Journal of Fish Biology

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Growing research effort has shown that physical enrichment (PE) can improve fish welfare and research validity. However, the inclusion of PE does not always result in positive effects and conflicting findings have highlighted the many nuances involved. Effects are known to depend on species and life stage tested, but effects may also vary with differences in the specific items used as enrichment between and within studies. Reporting fine‐scale characteristics of items used as enrichment in studies may help to reveal these factors. We conducted a survey of PE‐focused studies published in the last 5 years to examine the current state of methodological reporting. The survey results suggest that some aspects of enrichment are not adequately detailed. For example, the amount and dimensions of objects used as enrichment were frequently omitted. Similarly, the ecological relevance, or other justification, for enrichment items was frequently not made explicit. Focusing on ecologically relevant aspects of PE and increasing the level of detail reported in studies may benefit future work and we propose a framework with the acronym DETAILS (Dimensions, Ecological rationale, Timing of enrichment, Amount, Inputs, Lighting and Social environment). We outline the potential importance of each of the elements of this framework with the hope it may aid in the level of reporting and standardization across studies, ultimately aiding the search for more beneficial types of PE and the development of our understanding and ability to improve the welfare of captive fish and promote more biologically relevant behaviour.

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