Predictability of Reef Fish Recruitment in a Highly Variable Nursery Habitat

Aburto‐Oropeza, Octavio; Sala, Lorenza; Paredes, Gustavo; Mendoza, Abraham; Ballesteros, Enric

doi:10.1890/06-0857.1

Cited by 67 publications

(70 citation statements)

References 33 publications

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“…On the southern gulf coast of Baja California Sur, most research on fisheries and environmental variability has focused on documenting fluctuations in fish abundance and distribution (e.g., Aburto-Oropeza et al 2007. In other parts of the Gulf and Pacific coast, scholars have investigated adaptation strategies and vulnerability of fishing communities to climate change (e.g., McGuire and Greenberg 1993, Vásquez-León 1994, McCay et al 2011, Morzaria-Luna et al 2014).…”

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confidence: 99%

How do small-scale fishers adapt to environmental variability? Lessons from Baja California, Sur, Mexico

Sievanen

2014

Maritime Studies

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Many fisheries stocks and the livelihoods of those who make their living from fishing are in decline, and these declines are exacerbated by uncertainties associated with increased climate variability and change. Social scientists have long documented the importance of mobility and diversification in reducing the risk and uncertainty associated with climate variability, particularly in the context of small-scale fishing. However, it is unclear how these traditional mechanisms are buffering fishers against the varied stressors they currently face, including those associated with environmental variability. This paper examines how fishers on the southern gulf coast of the Mexican state of Baja California Sur perceive and respond to stressors associated with normal environmental variability, how their ability to adapt is spatially distributed, and what threats they perceive to their continued ability to adapt. Understanding the adaptation strategies and everyday vulnerabilities that fishers face can elucidate problems associated with current fisheries management and the underlying factors that cause vulnerability, and also help decision makers, including fishers themselves, develop more effective adaptation strategies in the face of climate change.

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confidence: 99%

How do small-scale fishers adapt to environmental variability? Lessons from Baja California, Sur, Mexico

Sievanen

2014

Maritime Studies

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“…4). A positive relationship between nursery size and abundance has been demonstrated on several occasions (Van der Veer et al 2000, Aburto-Oropeza et al 2007, Claudet et al 2008). In the case of adult competition regulation, i.e.…”

Section: Discussionmentioning

confidence: 97%

Effect of habitat productivity and exploitation on populations with complex life cycles

Wolfshaar¹,

HilleRisLambers²,

Gårdmark³

2011

Mar. Ecol. Prog. Ser.

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In this paper we study the consequences of habitat switching and the corresponding ontogenetic diet shifts between adult and juvenile life stages for harvesting and management of exploited populations using a consumer-resource model with stage-specific mortality. Specifically, we study how differences in stage-specific habitat productivity regulate exploited populations and affect yield. We show that the ratio of adult to juvenile habitat productivity determines whether the population is regulated by processes in the juvenile or adult stage and that population responses to changes in mortality (e.g. fishing) or habitat productivity (e.g. eutrophication or physical destruction) depend critically on the mechanism regulating the population. This result has important consequences for the management of marine fish. For example, in fisheries where the exploited population is regulated by processes in the juvenile stage, management measures aimed at protecting the juvenile habitat may be much more effective than regulating fishing effort on the adults. We find also that intermediate differences in habitat productivity lead to alternative stable states between a population regulated by processes in the juvenile or the adult stage. These alternative stable states may lead to counterintuitive population responses to harvesting.KEY WORDS: Alternative stable state · Density dependence · Habitat shift · Harvesting · Mortality · Productivity · Fisheries management Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 438: [175][176][177][178][179][180][181][182][183][184] 2011 (e.g. Pacific salmon species, Bradford 1995). Despite their common occurrence in nature (Sears et al. 2004, Able 2005, the implications of such habitat shifts for the population dynamics and management of marine fisheries have received little attention, and as a result, theory for the management of marine fish undergoing ontogenetic habitat shifts is still in its infancy (St Mary et al. 2000, Gårdmark et al. 2006.Recent evidence suggests that stage-specific, density-dependent processes may induce alternative stable states (Folke et al. 2004). In such case, changes in mortality in one stage may induce a rapid shift from one stable state to the other, leading to a counterintuitive change in overall abundance of a harvested population ). Shifts in habitat use between life stages may therefore also lead to alternative stables states (Schreiber & Rudolf 2008, Guill 2009). This suggests that management actions may have very different effects on exploited fish with stage-specific habitat shifts than on fish with habitat overlap throughout ontogeny. For example, the effectiveness of Marine Protected Areas (MPAs) in increasing overall abundance of harvestable life stages has been shown to depend on density-dependent interactions within other stages not of direct interest for management (Dugan & Davis 1993, St. Mary et al. 2000, Claessen et al. 2009). Processes within stages without commercial interest are th...

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“…We used the ecosystems inhabited by each focal species (Table S6) to represent their spawning and/or recruitment habitats, and assumed they all have, potentially, equal per unit area contributions of larvae. We did not distinguish between spawning and recruitment habitats because for our targeted species both are mainly areas within rocky reef systems (Aburto-Oropeza et al, 2007, Soria et al, 2012.…”

Section: Setting Conservation Goals and Objectivesmentioning

confidence: 99%

Designing connected marine reserves in the face of global warming

Álvarez‐Romero¹,

Munguía‐Vega²,

Beger³

et al. 2018

Preprint

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. 2018. Designing connected marine reserves in the face of global warming. Global Change Biology 24: e671-e691. https://doi.org/10. 1111/gcb.13989 Designing connected marine reserves in the face of global warming Jorge G. Álvarez-Romero AbstractMarine reserves are widely used to protect species important for conservation and fisheries and to help maintain ecological processes that sustain their populations, including recruitment and dispersal. Achieving these goals requires well-connected networks of marine reserves that maximize larval connectivity, thus allowing exchanges between populations and recolonization after local disturbances. However, global warming can disrupt connectivity by shortening potential dispersal pathways through changes in larval physiology. These changes can compromise the performance of marine reserve networks, thus requiring adjusting their design to account for ocean warming. To date, empirical approaches to marine prioritization have not considered larval connectivity as affected by global warming. Here, we propose a framework for designing marine reserve networks that integrates graph theory and changes in larval connectivity due to potential reductions in planktonic larval duration (PLD) associated with ocean warming, given current socioeconomic constraints. Using the Gulf of California as case study, we assess the benefits and costs of adjusting networks to account for connectivity, with and without ocean warming. We compare reserve networks designed to achieve representation of species and ecosystems with networks designed to also maximize connectivity under current and future ocean-warming scenarios. Our results indicate that current larval connectivity could be reduced significantly under ocean warming because of shortened PLDs. Given the potential changes in connectivity, we show that our graph-theoretical approach based on centrality (eigenvector and distance-weighted fragmentation) of habitat patches can help design better-connected marine reserve networks for the future with equivalent costs. We found that maintaining dispersal connectivity incidentally through representation-only reserve design is unlikely, particularly in regions with strong asymmetric patterns of dispersal connectivity. Our results support previous studies suggesting that, given potential reductions in PLD due to ocean warming, future marine reserve networks would require more and/or larger reserves in closer proximity to maintain larval connectivity.

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Predictability of Reef Fish Recruitment in a Highly Variable Nursery Habitat

Cited by 67 publications

References 33 publications

How do small-scale fishers adapt to environmental variability? Lessons from Baja California, Sur, Mexico

How do small-scale fishers adapt to environmental variability? Lessons from Baja California, Sur, Mexico

Effect of habitat productivity and exploitation on populations with complex life cycles

Designing connected marine reserves in the face of global warming

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