Fish reproduction in a warming world: vulnerable points in hormone regulation from sex determination to spawning

Philosophical Transactions of the Royal Society B Biological Sciences, Journal Year: 2024, Volume and Issue: 379(1898)

Published: Feb. 5, 2024

Reproduction in fishes is sensitive to temperature. Elevated temperatures and anomalous ‘heat waves’ associated with climate change have the potential impact fish reproductive performance and, some cases, even induce sex reversals. Here we examine how thermal sensitivity hormone pathways regulating reproduction provides a framework for understanding impacts of warmer conditions on reproduction. Such effects will differ depending evolved variation temperature endocrine processes determination/differentiation, gametogenesis spawning, as well developmental timing those varies ecology. For populations unable shift geographical range, persistence under future climates may require changes responsiveness processes. How among species, generate maxima reproduction, rapidly tolerances can via adaptation or transgenerational plasticity shape which are most at risk impaired rising temperatures. This article part theme issue ‘Endocrine responses environmental variation: conceptual approaches recent developments’.

Language: Английский

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Do you remember? Within-generation and transgenerational heat stress memory of recurring marine heatwaves in threespine stickleback

Proceedings of the Royal Society B Biological Sciences, Journal Year: 2025, Volume and Issue: 292(2040)

Published: Feb. 1, 2025

Marine heatwaves can have major and lasting effects on organism physiology species persistence. Such temperature extremes are increasing in frequency, with consecutive heatwave events already occurring within the lifetime of many organisms. Heat stress memory (thermal priming) by individuals is a potential within-generation response to cope recurring marine heatwaves. However, whether this form biological be inherited across generations not well known. We used three-generation experiment investigate individual transgenerational single fitness-related traits using stickleback (Gasterosteus aculeatus) as model species. exposed adults (both sexes) assessed female reproductive output both parent offspring generation, survival, growth behaviour establish holistic picture ectothermic fish. Exposure single, extreme lowered output, decreased exploratory behaviour, impeded capacity respond further thermal reduced long-term survival. prior experience (heat memory) mitigated some these at an (growth) (fecundity) level, indicating that experiencing frequency part ongoing climate change may better than previously thought.

Language: Английский

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Seasonal variability in resilience of a coral reef fish to marine heatwaves and hypoxia

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(9), P. 2522 - 2535

Published: Feb. 26, 2023

Abstract Climate change projections indicate more frequent and severe tropical marine heatwaves (MHWs) accompanying hypoxia year‐round. However, most studies have focused on peak summer conditions under the assumption that annual maximum temperatures will induce greatest physiological consequences. This study challenges this idea by characterizing seasonal MHWs (i.e., mean, maximum, cumulative intensities, durations, heating rates, mean occurrence) comparing metabolic traits standard rate (SMR), Q10 of SMR, (MMR), aerobic scope, critical oxygen tension ( P crit )) winter‐ summer‐acclimatized convict tang Acanthurus triostegus ) to combined effects hypoxia. Fish were exposed one six MHW treatments with seasonally varying intensities (winter: 24.5, 26.5, 28.5°C; summer: 28.5, 30.5, 32.5°C), representing past future IPCC +0, +2, +4°C). Surprisingly, characteristics did not significantly differ between seasons, yet SMR was sensitive winter (mean = 2.92) than 1.81), despite higher absolute temperatures. Concurrently, MMR increased similarly among +2 +4°C 28.5°C) all treatments, suggesting a ceiling for maximal increase. Aerobic scope seasons nor treatments. While vary warming during relative control group. Contrary sensitivity warmest time year, our results reveal heightened deleterious MHWs, acclimatization warmer may bolster resilience Consequently, extend across larger parts year previously expected, emphasizing importance evaluating climate impacts cooler when essential fitness‐related such as reproduction occur in many species.

Language: Английский

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Clownfish larvae exhibit faster growth, higher metabolic rates and altered gene expression under future ocean warming

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 873, P. 162296 - 162296

Published: Feb. 17, 2023

Increasing ocean temperatures have been demonstrated to a range of negative impacts on coral reef fishes. However, despite wealth studies juvenile/adult fish, how early developmental stages respond warming are limited. As overall population persistence is influenced by the development life stages, detailed larval responses essential. Here, in an aquaria-based study we investigate associated with future and present-day marine heatwaves (+3 °C) impact growth, metabolic rate, transcriptome 6 discrete clownfish larvae (Amphiprion ocellaris). A total clutches were assessed, 897 imaged, 262 undergoing testing 108 subject sequencing. Our results show that reared at +3 °C grow develop significantly faster exhibit higher rates than those control conditions. Finally, highlight molecular mechanisms underpinning response from different temperatures, genes metabolism, neurotransmission, heat stress epigenetic reprogramming differentially expressed °C. Overall, these indicate could be altered under warming, gene expression all affected. Such changes may lead dispersal, settlement time increased energetic costs.

Language: Английский

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Surviving the Anthropocene: The Resilience of Marine Animals to Climate Change

CRC Press eBooks, Journal Year: 2023, Volume and Issue: unknown, P. 35 - 80

Published: Aug. 11, 2023

If marine organisms are to persist through the Anthropocene, they will need be resilient, but what is resilience, and can resilience of build within a single lifetime or over generations?The aim this review evaluate capacity animals in time unprecedented global climate change.Resilience an ecosystem, society, organism recover from stress.Marine change phenotypic plasticity adaptation.Phenotypic involves changes physiology, morphology, behaviour which improve response new environment without altering their genotype.Adaptation evolutionary longer process, occurring many generations selection tolerant genotypes shift average phenotype population towards fitness peak.Research on has concentrated responses specific species stressors.It unknown whether adaptation including molluscs, echinoderms, polychaetes, crustaceans, corals, fish rapid enough for pace change.

Language: Английский

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Sex‐ and time‐specific parental effects of warming on reproduction and offspring quality in a coral reef fish

Evolutionary Applications, Journal Year: 2020, Volume and Issue: 14(4), P. 1145 - 1158

Published: Dec. 18, 2020

Global warming can disrupt reproduction or lead to fewer and poorer quality offspring, owing the thermally sensitive nature of reproductive physiology. However, phenotypic plasticity may enable some animals adjust thermal sensitivity maintain performance in warmer conditions. Whether elevated temperature affects depend on timing exposure sex parent exposed. We exposed male female coral reef damselfish (

Language: Английский

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The importance of considering the duration of extreme temperatures when investigating responses to climate change

Global Change Biology, Journal Year: 2022, Volume and Issue: 28(22), P. 6577 - 6585

Published: Aug. 10, 2022

The frequency and duration of heatwaves are increasing because human activities. To cope with the changes, species longer generation times may have to rely on plastic responses. probability that their responses adaptive is higher if experienced temperature fluctuations also in evolutionary past. However, experimental studies investigating often use exposure significantly shorter than recent heatwaves. We show this can lead faulty conclusions has be considered designs. recorded response threespine stickleback prolonged during breeding season, using a population large its past and, hence, expected endure changes well. found males adaptively adjust reproductive behaviours short periods temperature, but not extended across two cycles. Males initially increased activities-nest building, courtship parental care-which ensured high success first cycle, decreased activities second cycle when exposed sustained temperature. This reduced resulted fewer offspring. Thus, well suffers fitness reductions prolonged. results stress importance considering extreme environmental conditions impact species. Responses short-term exposures cannot extrapolated assess conditions.

Language: Английский

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Reducing bias in experimental ecology through directed acyclic graphs

Ecology and Evolution, Journal Year: 2023, Volume and Issue: 13(3)

Published: March 1, 2023

Abstract Ecologists often rely on randomized control trials (RCTs) to quantify causal relationships in nature. Many of our foundational insights ecological phenomena can be traced back well‐designed experiments, and RCTs continue provide valuable today. Although are regarded as the “gold standard” for inference, it is important recognize that they too a set assumptions must justified met by researcher draw valid conclusions. We use key examples show how biases such confounding, overcontrol, collider bias occur experimental setups. In tandem, we highlight removed through application structural model (SCM) framework. The SCM framework visualizes structure system or process under study using directed acyclic graphs (DAGs) subsequently applies graphical rules remove from both observational data. DAGs applied across studies ensure proper design statistical analysis, leading more accurate estimates drawn conclusions taken at face value, ecologists increasingly becoming aware approaches carefully designed analyzed avoid potential biases. By applying visual conceptual tool, meet required inference.

Language: Английский

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Haematological and biochemical reference intervals for wild green turtles (Chelonia mydas): a Bayesian approach for small sample sizes

Conservation Physiology, Journal Year: 2022, Volume and Issue: 10(1)

Published: Jan. 1, 2022

Abstract Animal health is directly linked to population viability, which may be impacted by anthropogenic disturbances and diseases. Reference intervals (RIs) for haematology blood biochemistry are essential tools the assessment of animal health. However, establishing interpreting robust RIs threatened species often challenged small sample sizes. Bayesian predictive modelling well suited size limitations, accounting individual variation interactions between influencing variables. We aimed derive baseline green turtles (Chelonia mydas) across two foraging aggregations in North Queensland, Australia, using generalized linear mixed-effects models (n = 97). The predicted were contained within previously published values had narrower credible intervals. Most analytes did not vary significantly with ground (76%, 22/29), body mass (86%, 25/29) or curved carapace length (83%, 24/29). Length effects found eosinophils, heterophil:lymphocyte ratio, alkaline phosphatase, aspartate transaminase urea. Significant differences grounds albumin, cholesterol, potassium, total protein, triglycerides, uric acid calcium:phosphorus ratio. provide derived turtles, will helpful future assessments conservation efforts. Future RI studies on would benefit from adapting established veterinary biomedical standards.

Language: Английский

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Parents exposed to warming produce offspring lower in weight and condition

Ecology and Evolution, Journal Year: 2022, Volume and Issue: 12(7)

Published: July 1, 2022

The parental environment can alter offspring phenotypes via the transfer of non-genetic information. Parental effects may be viewed as an extension (within-generation) phenotypic plasticity. Smaller size, poorer physical condition, and skewed sex ratios are common responses organisms to global warming, yet whether alleviate, exacerbate, or have no impact on these has not been widely tested. Further, relative influence mothers fathers ontogenetic timing exposure warming is poorly understood. Here, we tested how maternal, paternal, biparental a coral reef fish (

Language: Английский

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