Effect of near-future seawater temperature rises on sea urchin sperm longevity

Binet, Monique T.; Doyle, C. J.

doi:10.1071/mf12121

Cited by 16 publications

(5 citation statements)

References 51 publications

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“…Variation in seawater temperature is characteristic of many nearshore ecosystems. Our results, covering a wide range of temperatures, showed responses that were consistent with TPCs reported for many traits from a wide array of species [110][111][112][113][114]. Although simple positive or negative responses to increasing temperatures have been reported in some echinoderms (Table 1), these results typically emerge from experiments covering a narrower thermal range…”

Section: Discussionsupporting

confidence: 89%

The effects of temperature and pH on the reproductive ecology of sand dollars and sea urchins: Impacts on sperm swimming and fertilization

et al. 2022

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In an era of climate change, impacts on the marine environment include warming and ocean acidification. These effects can be amplified in shallow coastal regions where conditions often fluctuate widely. This type of environmental variation is potentially important for many nearshore species that are broadcast spawners, releasing eggs and sperm into the water column for fertilization. We conducted two experiments to investigate: 1) the impact of water temperature on sperm swimming characteristics and fertilization rate in sand dollars (Dendraster excentricus; temperatures 8-38°C) and sea urchins (Mesocentrotus franciscanus; temperatures 8-28°C) and; 2) the combined effects of multiple stressors (water temperature and pH) on these traits in sand dollars. We quantify thermal performance curves showing that sand dollar fertilization rates, sperm swimming velocities, and sperm motility display remarkably wide thermal breadths relative to red urchins, perhaps reflecting the wider range of water temperatures experienced by sand dollars at our field sites. For sand dollars, both temperature (8, 16, 24°C) and pH (7.1, 7.5, 7.9) affected fertilization but only temperature influenced sperm swimming velocity and motility. Although sperm velocities and fertilization were positively correlated, our fertilization kinetics model dramatically overestimated measured rates and this discrepancy was most pronounced under extreme temperature and pH conditions. Our results suggest that environmental stressors like temperature and pH likely impair aspects of the reproductive process beyond simple sperm swimming behavior.

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Section: Discussionsupporting

confidence: 89%

The effects of temperature and pH on the reproductive ecology of sand dollars and sea urchins: Impacts on sperm swimming and fertilization

et al. 2022

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“…The thermal conditions during embryogenesis may provide the organism with information about anticipated environmental breeding conditions. Experiments with sea urchin Heliocidaris tuberculata sperm showed that longevity of spermatozoa decreases with increasing water temperature (Binet & Doyle 2013), and the same may hold for other organisms. Thus, a larger number of sperm cells, which travel in the water for external fertilization of the eggs, may compensate for an expected shorter activity period in warmer water.…”

Section: Discussionmentioning

confidence: 96%

Linking embryonic temperature with adult reproductive investment in Atlantic salmon Salmo salar

Jönsson¹,

Jönsson²,

Finstad³

2014

Mar. Ecol. Prog. Ser.

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The expression of fitness-related traits, such as egg and gonad size, often varies among habitats and exhibits clinal variation along climatic and latitudinal gradients. However, the mechanisms allowing such variations are obscure and have been ascribed to both phenotypic plasticity and genetic adaptation. We experimentally tested whether variation in egg and gonad size of a poikilotherm vertebrate is influenced by the temperature individuals experienced during embryogenesis, possibly as an epigenetic effect. Atlantic salmon Salmo salar eggs were incubated under 3 embryonic thermal regimes: cold, mixed and warm treatments. The cold group received ambient river water (mean ± SD: 2.6 ± 0.4°C) and the warm group received water at 4.6°C above ambient temperature, the expected temperature in the river towards the end of this century, from fertilization until exogenous feeding commenced. The mixed group received ambient river water until hatching, whereupon the larvae received heated water until exogenous feeding commenced. When exogenous feeding was initiated, all fish were reared under identical, natural thermal conditions. At adulthood, fish that developed from warm-incubated eggs were largest, had the highest mass−length relationship and developed larger eggs and higher gonad mass relative to their own body size. There was no similar effect of thermal environment during larval development. The treatment did not affect age of maturity or fecundity. Thus, thermal conditions during embryogenesis affected the expression of adult life-history traits, a mechanism by which fish may rapidly change the size of their propagules to the anticipated thermal offspring environment. This is a novel result explaining variation in these core life-history traits.

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“…In other squamates and mammalians, high temperatures also harm sperm dynamic, possibly through an increase in sperm metabolic rates that alters enzymes or the resistance of the lipid membrane to Reactive Oxygen Species (ROS) ( Soren et al, 2018 ; Tourmente et al, 2011b ). In ectotherm marine species, warming environments can either boost ( Ho et al, 2013 ) or harm sperm velocity ( Binet and Doyle, 2013 ). In internally fertilizing ectotherms, sperm production ( Zeh et al, 2012 ) and performance within the female tract might be negatively impacted, since sperm deteriorates rapidly after being exposed to heatwaves ( Sales et al, 2018 ).…”

Section: Discussionmentioning

confidence: 99%

Oviductal fluid counterbalances the negative effect of high temperature on sperm in an ectotherm model

et al. 2021

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Global warming is affecting biodiversity; however, the extent to which animal reproductive processes respond to predicted temperature increments remains largely unexplored. The thermal environment has a pronounced impact on metabolic rates of ectotherms; therefore, an interesting question to assess is whether temperature increase might affect specific reproductive mechanisms like sperm performance in ectotherms. Moreover, in many species, oviductal fluid (OF) is known to regulate and maintain sperm quality; however, the role of oviductal fluid in relation to the effects of high temperature on sperm remains unclear. Our aim was to experimentally test the effect of increased temperature on sperm velocity, swimming path and percentage of motility in neutral conditions at ejaculation (without OF) and in femalés reproductive tract fluid (with OF), in a social ectotherm lizard model, Tropidurus spinulosus, which has specific thermal requirements for reproduction. Our results suggest that a rising temperature associated with global warming (+4°C) affects negatively sperm dynamics and survival. However, OF fluid ameliorated the harmful effects of high temperature. This is an important point, as this study is the first that ever tested the role of OF to preserve sperm from a warmer pre-fertilization environment. These results contribute to our understanding of how thermal environment changes might affect post-copulatory reproductive mechanisms.

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Effect of near-future seawater temperature rises on sea urchin sperm longevity

Cited by 16 publications

References 51 publications

The effects of temperature and pH on the reproductive ecology of sand dollars and sea urchins: Impacts on sperm swimming and fertilization

The effects of temperature and pH on the reproductive ecology of sand dollars and sea urchins: Impacts on sperm swimming and fertilization

Linking embryonic temperature with adult reproductive investment in Atlantic salmon Salmo salar

Oviductal fluid counterbalances the negative effect of high temperature on sperm in an ectotherm model

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