Early Life History and Fisheries Oceanography: New Questions in a Changing World

Oceanography, Journal Year: 2014, Volume and Issue: 27(4), P. 26 - 41

Published: Dec. 1, 2014

In the past 100 years since birth of fisheries oceanography, research on early life history fishes, particularly larval stage, has been extensive, and much progress made in identifying mechanisms by which factors such as feeding success, predation, or dispersal can influence survival.However, recent years, study fish undergone a major and, arguably, necessary shift, resulting growing body aimed at understanding consequences climate change other anthropogenically induced stressors.Here, we review these efforts, focusing ways stages are directly indirectly affected increasing temperature; CO 2 concentrations, ocean acidification; spatial, temporal, magnitude changes secondary production spawning; synergistic effects fishing change.We highlight how affect not only survivorship, but also planktonic eggs larvae, thus connectivity replenishment subpopulations.While this work is its infancy many speculative entirely unknown, new modeling approaches proving to be insightful predicting stage survival may future will impact economically ecologically important populations.

Language: Английский

---

Meta-analysis reveals an extreme “decline effect” in the impacts of ocean acidification on fish behavior

PLoS Biology, Journal Year: 2022, Volume and Issue: 20(2), P. e3001511 - e3001511

Published: Feb. 3, 2022

Ocean acidification—decreasing oceanic pH resulting from the uptake of excess atmospheric CO 2 —has potential to affect marine life in future. Among possible consequences, a series studies on coral reef fish suggested that direct effects acidification behavior may be extreme and have broad ecological ramifications. Recent documenting lack effect experimental ocean behavior, however, call this prediction into question. Indeed, phenomenon decreasing sizes over time is not uncommon typically referred as “decline effect.” Here, we explore consistency robustness scientific evidence past decade regarding behavior. Using systematic review meta-analysis 91 empirically testing provide quantitative research date topic characterized by decline effect, where large initial all but disappeared subsequent decade. The field cannot explained 3 likely biological explanations, including increasing proportions examining (1) cold-water species; (2) nonolfactory-associated behaviors; (3) nonlarval stages. Furthermore, vast majority with tend low sample sizes, yet are published high-impact journals disproportionate influence terms citations. We contend has negligible impact advocate for improved approaches minimize future avenues research.

Language: Английский

---

An updated synthesis of the observed and projected impacts of climate change on the chemical, physical and biological processes in the oceans

Frontiers in Marine Science, Journal Year: 2015, Volume and Issue: 2

Published: June 26, 2015

The 5th Assessment Report (AR5) of the Intergovernmental Panel on Climate Change (IPCC) states with very high certainty that anthropogenic emissions have caused measurable changes in physical ocean environment. These are summarized special focus those predicted to strongest, most direct effects biological processes; namely, warming and associated phenomena (including stratification sea level rise) as well deoxygenation acidification. these then discussed for microbes phytoplankton), plants, animals, warm cold-water corals, ecosystems. IPCC AR5 highlighted several areas related both processes required further research. As a rapidly developing field, there been many pertinent studies published since cut off dates AR5, which increased our understanding at work. This study undertook an extensive review recently literature update findings provide synthesized main issues facing future oceans. detail provided subsequent work basis constructing projections state ecosystems 2100 under two Representative Concentration Pathways RCP4.5 8.5. Finally highlights notable additions, clarifications points departure from by studies.

Language: Английский

---

Elevated carbon dioxide alters the plasma composition and behaviour of a shark

Biology Letters, Journal Year: 2014, Volume and Issue: 10(9), P. 20140538 - 20140538

Published: Sept. 1, 2014

Increased carbon emissions from fossil fuels are increasing the pCO2 of ocean surface waters in a process called acidification. Elevated water can induce physiological and behavioural effects teleost fishes, although there appear to be large differences sensitivity between species. There is currently no information available on possible responses future acidification elasmobranch fishes. We exposed small-spotted catsharks (Scyliorhinus canicula) either control conditions or year 2100 scenario 990 μatm for four weeks. did not detect treatment growth, resting metabolic rate, aerobic scope, skin denticle ultrastructure morphology. However, we found that elevated group buffered internal acidosis via [Formula: see text] accumulation with an associated increase Na(+), indicating blood chemistry remained altered despite long acclimation period. The also exhibited shift their nocturnal swimming pattern many starts stops more continuous swimming. Although CO2-exposed fishes display reduced asymmetry (lateralization), sharks showed increased lateralization. These may suggest neurophysiology affected by CO2, as some teleosts, CO2 constant stressor, which leads behaviour. potential direct should henceforth considered when assessing anthropogenic sharks.

Language: Английский

---

Olfactory navigation during spawning migrations: a review and introduction of the Hierarchical Navigation Hypothesis

Biological reviews/Biological reviews of the Cambridge Philosophical Society, Journal Year: 2015, Volume and Issue: 91(3), P. 728 - 759

Published: April 28, 2015

ABSTRACT Migrations are characterized by periods of movement that typically rely on orientation towards directional cues. Anadromous fish undergo several different forms oriented during their spawning migration and provide some the most well‐studied examples migratory behaviour. During freshwater phase migration, locate grounds via olfactory In this review, we synthesize research explores role olfaction anadromous fish, which focuses two families: Salmonidae (salmonids) Petromyzontidae (lampreys). We draw attention to limitations in research, highlight potential areas investigation will help fill current knowledge gaps. also use information assembled from our review formulate a new hypothesis for natal homing salmonids. Our posits migrating adults three types cues hierarchical fashion: imprinted (primary), conspecific (secondary), non‐olfactory environmental (tertiary). evidence previous studies support hypothesis. discuss future directions can test further understanding migration.

Language: Английский

---