Climate Change Effects on North American Fish and Fisheries to Inform Adaptation Strategies

Fisheries, Journal Year: 2021, Volume and Issue: 46(9), P. 449 - 464

Published: Aug. 18, 2021

Abstract Climate change is a global persistent threat to fish and habitats throughout North America. Climate-induced modification of environmental regimes, including changes in streamflow, water temperature, salinity, storm surges, habitat connectivity can physiology, disrupt spawning cues, cause extinctions invasions, alter community structure. Reducing greenhouse emissions remains the primary mechanism slow pace climate change, but local regional management agencies stakeholders have developed an arsenal adaptation strategies help partially mitigate effects on fish. We summarize common stressors posed by America, (1) increased (2) precipitation, (3) sea level rise, (4) ocean acidification, present potential that fishery professionals may apply vulnerable fisheries cope with changing climate. Although our are primarily from they broader geographic applicability aquatic biota other jurisdictions. These provide opportunities for managers while needed policies reduce gas emerge, which offer more lasting solutions.

Language: Английский

---

Diel pCO₂ fluctuations alter the molecular response of coral reef fishes to ocean acidification conditions

Molecular Ecology, Journal Year: 2021, Volume and Issue: 30(20), P. 5105 - 5118

Published: Aug. 17, 2021

Environmental partial pressure of CO2 (pCO2 ) variation can modify the responses marine organisms to ocean acidification, yet underlying mechanisms for this effect remain unclear. On coral reefs, environmental pCO2 fluctuates on a regular day-night cycle. Effects future acidification reef fishes might therefore depend their response diel cycle . To evaluate effects brain molecular response, we exposed two common (Acanthochromis polyacanthus and Amphiprion percula) projected levels (750 1,000 µatm) under both stable fluctuating conditions. We found signature elevated species, which included downregulation immediate early genes, indicating lower activity. The transcriptional programme was more strongly affected by higher average in treatment than treatments, but largest difference between treatments. This indicates that change conditions is different living environments. differential regulation related steroid hormones circadian rhythm (CR). Both species exhibited marked expression CR genes among possibly accommodating flexible adaptive approach changes. Our results suggest fluctuations enable phase-shift clocks anticipate changes, thereby avoiding impairments successfully adjust

Language: Английский

---

High sensitivity of a keystone forage fish to elevated CO2 and temperature

Conservation Physiology, Journal Year: 2019, Volume and Issue: 7(1)

Published: Jan. 1, 2019

Abstract Sand lances of the genus Ammodytes are keystone forage fish in coastal ecosystems across northern hemisphere. Because they directly support populations higher trophic organisms such as whales, seabirds or tuna, current lack empirical data and, therefore, understanding about climate sensitivity sand represent a serious knowledge gap. could be particularly susceptible to ocean warming and acidification because, contrast other tested species, reproduce during boreal winter months, their offspring develop slowly under relatively low stable pCO2 conditions. Over course 2 years, we conducted factorial × temperature exposure experiments on lance dubius, key species northwest Atlantic shelf. Wild, spawning-ripe adults were collected from Stellwagen Bank National Marine Sanctuary (Cape Cod, USA), fertilized embryos reared at three conditions (400, 1000 2100 μatm) crossed with temperatures (5, 7 10 ˚C). Exposure future consistently resulted severely reduced embryo survival. Sensitivity elevated was highest ˚C, resulting up an 89% reduction hatching success between control predicted end-of-century Moreover, delayed hatching, remaining endogenous energy reserves hatch embryonic growth. Our results suggest that is exceptionally CO2-sensitive compared species. Whether similar life history characteristics equally currently unknown. But possibility conservation concern, because many shelf rely might therefore more vulnerable change than recognized. findings indicate history, spawning habitat, phenology developmental rates mediate divergent early CO2 sensitivities among

Language: Английский

---

Thermal tolerance and hypoxia tolerance are associated in blacktip reef shark (Carcharhinus melanopterus) neonates

Journal of Experimental Biology, Journal Year: 2020, Volume and Issue: 223(14)

Published: July 15, 2020

ABSTRACT Thermal dependence of growth and metabolism can influence thermal preference tolerance in marine ectotherms, including threatened data-deficient species. Here, we quantified the physiological performance neonates a tropical shark species (blacktip reef shark, Carcharhinus melanopterus) from shallow, nearshore habitats. We measured minimum maximum oxygen uptake rates (ṀO2), calculated aerobic scope, excess post-exercise consumption recovery exercise, critical maxima (CTmax), safety margins, hypoxia tolerance, specific rates, body condition food conversion efficiencies at two ecologically relevant acclimation temperatures (28 31°C). Owing to high mortality, third temperature (33°C) was not investigated further. Acclimation did affect ṀO2 or growth, but CTmax were greatest 31°C positively associated. also vitro (25, 30 35°C) pH effects on haemoglobin–oxygen (Hb–O2) affinity wild-caught, non-acclimated sharks. As expected, Hb–O2 decreased with increasing temperatures, observed 30°C absent 25 35°C. Finally, logged free-ranging sharks determined that C. melanopterus avoided situ. conclude demonstrate minimal whole-organism across seasonal range may use behaviour avoid unfavourable environmental temperatures. The association between suggests common mechanism warranting further investigation. Future research should explore consequences ocean warming, especially nearshore,

Language: Английский

---

Ocean acidification effects on fish hearing

Proceedings of the Royal Society B Biological Sciences, Journal Year: 2021, Volume and Issue: 288(1946), P. 20202754 - 20202754

Published: March 3, 2021

Humans are rapidly changing the marine environment through a multitude of effects, including increased greenhouse gas emissions resulting in warmer and acidified oceans. Elevated CO 2 conditions can cause sensory deficits altered behaviours organisms, either directly by affecting end organ sensitivity or due to likely alterations brain chemistry. Previous studies show that auditory-associated larval juvenile fishes be affected elevated (1000 µatm). Here, using auditory evoked potentials (AEP) micro-computer tomography (microCT) we raising snapper, Chrysophyrs auratus , under predicted future resulted significant changes their hearing ability. Specifically, snapper raised had decrease low frequency (less than 200 Hz) sensitivity. MicroCT demonstrated these sacculus otolith's were significantly larger fluctuating asymmetry, which explains difference We suggest have dual effect on hearing, effecting organs altering previously described induced behaviours. This is first time been empirically linked modification anatomy fish Given widespread well-documented impact anatomy, predictions how life-history functions dependent may respond climate change need reassessed.

Language: Английский

---

Impaired hatching exacerbates the high CO2 sensitivity of embryonic sand lance Ammodytes dubius

Marine Ecology Progress Series, Journal Year: 2022, Volume and Issue: 687, P. 147 - 162

Published: Feb. 3, 2022

Rising oceanic partial pressure of CO 2 (pCO ) could affect many traits in fish early life stages, but only few species to date have shown direct -induced survival reductions. This might partly be because from less -variable, offshore environments higher latitudes are currently underrepresented the literature. We conducted new experimental work on northern sand lance Ammodytes dubius , a key forage Northwest Atlantic banks, which was recently suggested highly -sensitive. In complementary trials, we produced embryos wild, Gulf Maine spawners and reared them at several pCO levels (~400-2000 µatm) combination with static (6, 7, 10°C) dynamic (10→5°C) temperature treatments. Again, consistently observed large, reductions hatching success (-23% 1000 µatm, -61% ~2000 µatm), effects were temperature-independent. To distinguish during development potential impacts itself, some switched between high control treatments just prior hatch. indeed altered patterns, consistent -impaired hypothesis. High also delayed day first hatch one trial peak other, where later-hatched larvae similar size progressively endogenous energy reserves. For context, extracted seasonal projections for Stellwagen Bank (Gulf Maine) regional ensemble simulations, indicated reduction 71% contemporary by 2100. The species’ unusual sensitivity has large ecological scientific ramifications that warrant future in-depth research.

Language: Английский

---

Climate-Change Impacts on Cephalopods: A Meta-Analysis

Integrative and Comparative Biology, Journal Year: 2023, Volume and Issue: 63(6), P. 1240 - 1265

Published: July 19, 2023

Synopsis Aside from being one of the most fascinating groups marine organisms, cephalopods play a major role in food webs, both as predators and prey, while representing key living economic assets, namely for artisanal subsistence fisheries worldwide. Recent research suggests that are benefitting ongoing environmental changes overfishing certain fish stocks (i.e., their and/or competitors), putting forward hypothesis this group may be few “winners” climate change. While many meta-analyses have demonstrated negative overwhelming consequences ocean warming (OW), acidification (OA), combination variety taxa, such comprehensive analysis is lacking cephalopod molluscs. In context, existing literature was surveyed peer-reviewed articles featuring sustained (≥24 h) controlled exposure species (Cephalopoda class) to these factors, applying comparative framework mixed-model (784 control-treatment comparisons, 47 suitable articles). Impacts on wide set biological categories at individual level (e.g., survival, metabolism, behavior, cell stress, growth) were evaluated contrasted across different ecological attributes taxonomic lineages, climates, ontogenetic stages). Contrary what commonly assumed, OW arises clear threat cephalopods, OA exhibited more restricted impacts. fact, impacts ubiquitous stages ontogeny, taxonomical lineages octopuses, squids, cuttlefish). These results challenge assumption benefit novel conditions, revealing an overarching impact group. Importantly, we also identify lingering gaps, showing studies date focus early life mainly temperate species. Our raise need consolidate experimental efforts wider regions, stages, other stressors, deoxygenation hypoxia, better understand how will cope with future

Language: Английский

---

Bacteria-Produced Algicide for Field Control of Toxic Dinoflagellates Does Not Cause a Cortisol Stress Response in Two Estuarine Fish Species

Marine Biotechnology, Journal Year: 2025, Volume and Issue: 27(1)

Published: Jan. 14, 2025

Abstract Application of algicides produced by naturally occurring bacteria is considered an environmentally friendly approach to control harmful algal blooms. However, few studies assess the effects bacterial on non-target species, either independently or with other stressors. Here, we measured sub-lethal dinoflagellate-specific algicide IRI-160AA estuarine fish Fundulus heteroclitus and Menidia menidia in laboratory experiments. Plasma cortisol levels were test whether a neuroendocrine stress response was induced these following exposure alone, combination diel-cycling hypoxia and/or pH, at 25 30 °C. Results show that does not significantly affect temperature tested, occurs co-occurring pH cycles as potential multiple These results support application blooms environments.

Language: Английский

---

Combined Effects of Acute Temperature Change and Elevated pCO2 on the Metabolic Rates and Hypoxia Tolerances of Clearnose Skate (Rostaraja eglanteria), Summer Flounder (Paralichthys dentatus), and Thorny Skate (Amblyraja radiata)

Biology, Journal Year: 2019, Volume and Issue: 8(3), P. 56 - 56

Published: July 26, 2019

Understanding how rising temperatures, ocean acidification, and hypoxia affect the performance of coastal fishes is essential to predicting species-specific responses climate change. Although a population’s habitat influences physiological performance, little work has explicitly examined multi-stressor species from habitats differing in natural variability. Here, clearnose skate (Rostaraja eglanteria) summer flounder (Paralichthys dentatus) mid-Atlantic estuaries, thorny (Amblyraja radiata) Gulf Maine, were acutely exposed current projected temperatures (20, 24, or 28 °C; 22 30 9, 13, 15 °C, respectively) acidification conditions (pH 7.8 7.4). We tested metabolic rates tolerance using intermittent-flow respirometry. All three exhibited increases standard rate under an 8 °C temperature increase (Q10 1.71, 1.07, 2.56, respectively), although this was most pronounced skate. At lowest test low pH treatment, all significant (44–105%; p < 0.05) decreases (60–84% critical oxygen pressure; 0.05). This study demonstrates interactive effects increasing changing carbonate chemistry are species-specific, implications which should be considered within context habitat.

Language: Английский

---

Diel pCO2 variation among coral reefs and microhabitats at Lizard Island, Great Barrier Reef

Coral Reefs, Journal Year: 2020, Volume and Issue: 39(5), P. 1391 - 1406

Published: July 16, 2020

Language: Английский

---