Hypoxia alters vulnerability to capture and the potential for trait-based selection in a scaled-down trawl fishery

Thambithurai, Davide; Crespel, Amélie; Norin, Tommy; Rácz, Anita; Lindström, Jan; Parsons, Kevin J.; Killen, Shaun S.

doi:10.1093/conphys/coz082

Cited by 15 publications

(11 citation statements)

References 65 publications

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“…Similarly, the great dilution effect occurring in oceans makes behavior effects from anthropogenic contaminants less likely in marine ecosystems. Yet, large‐scale anthropogenic forcing on fish boldness is expected in oceans due to the impacts from acoustic stressors and fishery (Figure 1), even if hypoxia (Thambithurai et al, 2019) and marine‐protected areas (Gilman et al, 2019) may work counteractive to selective harvesting of fish behavior type by fisheries. Recent empirical studies show that it is behavioral traits rather than body size per se that determines fish's vulnerability for being harvested during fishery (Biro & Post, 2008), and that selection response of behavioral trait is faster than that of life‐history traits (Merilä & Sheldon, 2000; Mousseau & Roff, 1987).…”

Section: Discussionmentioning

confidence: 99%

Anthropogenic forcing of fish boldness and its impacts on ecosystem structure

Wang

Zhang

et al. 2020

Global Change Biology

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Modified fish behaviors in response to anthropogenic stressors, such as chemicals, microplastics, acoustic emissions and fisheries, are a debated driver of change in freshwater ecosystems and oceans. Our ability to judge the severity of observed behavioral responses is hampered by limited knowledge regarding how subtle behavior modifications in prey fish affect ecosystems. Here we show that anthropogenic stressors affecting fish boldness are not expected to cause population collapse, but rather elusive effects on fish length, population biomass, reproduction and ecosystem state shifts. We use a physiologically structured population model (three trophic levels), well fed with empirical data, to simulate how previously suggested alterations of fish boldness traits due to anthropogenic stressors affect ecosystem structure. Our results suggest that these stressors may cause ecosystem structure effects, such as skewed size distributions, reduced fish biomass and reduced reproduction success, by altering the foraging behavior of fish. However, the specific structure effects depend on where the boldness–shyness continuum change occurs and on the species‐specific life stages. The model also highlights somewhat counterintuitive effects leading to possible extinction of predators when the foraging behavior of the prey is hampered. We conclude that anthropogenic forcing of fish behavior may be a hidden mechanism behind ecosystem structure changes in both freshwater and marine ecosystems.

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Section: Discussionmentioning

confidence: 99%

Anthropogenic forcing of fish boldness and its impacts on ecosystem structure

Wang

Zhang

et al. 2020

Global Change Biology

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“…Respirometry. Individual fish oxygen uptake (MO 2 ) was measured using intermittent flow respirometry as previously described (47,48). Briefly, the setup was immersed into a 40-L tank filled with fully aerated freshwater thermoregulated at 28 °C and shielded from surrounding disturbances.…”

Section: Phenotypic Characterizationmentioning

confidence: 99%

Genomic basis of fishing-associated selection varies with population density

Crespel

Schneider

Miller

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Fisheries induce one of the strongest anthropogenic selective pressures on natural populations, but the genetic effects of fishing remain unclear. Crucially, we lack knowledge of how capture-associated selection and its interaction with reductions in population density caused by fishing can potentially shift which genes are under selection. Using experimental fish reared at two densities and repeatedly harvested by simulated trawling, we show consistent phenotypic selection on growth, metabolism, and social behavior regardless of density. However, the specific genes under selection—mainly related to brain function and neurogenesis—varied with the population density. This interaction between direct fishing selection and density could fundamentally alter the genomic responses to harvest. The evolutionary consequences of fishing are therefore likely context dependent, possibly varying as exploited populations decline. These results highlight the need to consider environmental factors when predicting effects of human-induced selection and evolution.

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“…Severe effects include metabolic depression, migration of macro‐organisms, and mortality from exposure to low‐oxygen conditions (Diaz & Rosenberg, 1995; Ekau et al., 2010; Gray et al., 2002; Levin et al., 2009; Riedel et al., 2008; Roman et al., 2019; Stramma et al., 2010; Vaquer‐Sunyer & Duarte, 2008; Wu, 2002; Yoann et al., 2019). In addition, lack of oxygen can alter predator‐prey relations (Decker et al., 2004; Nestlerode & Diaz, 1998), disturb bioturbation (Norkko et al., 2015; Villnäs et al., 2013), promote coastal water‐column denitrification and nitrous oxide production (Bianchi et al., 2018; Naqvi et al., 2006; Sarkar et al., 2020), and severely impact fisheries (Díaz et al., 2010; Glaspie et al., 2019; Laffoley & Baxter, 2019; Thambithurai et al., 2019). For instance, in 2001 a coastal dead zone collapsed local shrimp fisheries along the western coast of India, resulting in a near 5‐fold decline in prawn catch compared to 1997, when less hypoxic conditions prevailed (Naqvi et al., 2009).…”

Section: Introductionmentioning

confidence: 99%

Coastlines at Risk of Hypoxia From Natural Variability in the Northern Indian Ocean

Pearson

Resplandy

Poupon

2022

Global Biogeochemical Cycles

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Coastal hypoxia—harmfully low levels of oxygen—is a mounting problem that jeopardizes coastal ecosystems and economies. The northern Indian Ocean is particularly susceptible due to human‐induced impacts, vast naturally occurring oxygen minimum zones, and strong variability associated with the seasonal monsoons and interannual Indian Ocean Dipole (IOD). We assess how natural factors influence the risk of coastal hypoxia by combining a large set of oxygen measurements with satellite observations to examine how the IOD amplifies or suppresses seasonal hypoxia tied to the Asian Monsoon. We show that on both seasonal and interannual timescales hypoxia is controlled by wind‐ and coastal Kelvin wave‐driven upwelling of oxygen‐poor waters onto the continental shelf and reinforcing biological feedbacks (increased subsurface oxygen demand). Seasonally, the risk of hypoxia is highest in the western Arabian Sea in summer/fall (71% probability of hypoxia). Major year‐to‐year impacts attributed to the IOD occur during positive phases along the eastern Bay of Bengal (EBoB), where the risk of coastal hypoxia increases from moderate to high in summer/fall (21%–46%) and winter/spring (31%–42%), and along the eastern Arabian Sea (i.e., India, Pakistan) where the risk drops from high to moderate in summer/fall (53%–34%). Strong effects are also seen in the EBoB during negative IOD phases, when the risk reduces from moderate to low year‐round (∼25% to ∼5%). This basin‐scale mapping of hypoxic risk is key to aid national and international efforts that monitor, forecast, and mitigate the impacts of hypoxia on coastal ecosystems and ecosystem services.

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Hypoxia alters vulnerability to capture and the potential for trait-based selection in a scaled-down trawl fishery

Cited by 15 publications

References 65 publications

Anthropogenic forcing of fish boldness and its impacts on ecosystem structure

Anthropogenic forcing of fish boldness and its impacts on ecosystem structure

Genomic basis of fishing-associated selection varies with population density

Coastlines at Risk of Hypoxia From Natural Variability in the Northern Indian Ocean

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