The small world of global marine fisheries: The cross-boundary consequences of larval dispersal

Ramesh, N.; Rising, James; Oremus, Kimberly L.

doi:10.1126/science.aav3409

Cited by 43 publications

(31 citation statements)

References 38 publications

(52 reference statements)

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“…It suggests the need of a tight international collaboration between adjacent countries, e.g. Italy, Greece, Croatia and Albania, to ensure efficient fishery spatial management in the Adriatic Sea (Hidalgo et al, 2019;Ramesh et al, 2019). Among the total pool of larvae supplied to the Apulian coast, where professional and recreational fishing occurs, almost of D. sargus larvae and of D. vulgaris…”

Section: Exploiting Connectivity Information For Conservation Purposesmentioning

confidence: 99%

A multidisciplinary analytical framework to delineate spawning areas and quantify larval dispersal in coastal fish

Legrand

Franco

Ser‐Giacomi

et al. 2019

Marine Environmental Research

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Assessing larval dispersal is essential to understand the structure and dynamics of marine populations. However, knowledge about early-life dispersal is sparse, and so is our understanding of the spawning process, perhaps the most obscure component of biphasic life cycles. Indeed, the poorly known species-specific spawning modality and early-life traits, along with the high spatio-temporal variability of the oceanic circulation experienced during larval drift, hamper our ability to properly appraise the realized connectivity of coastal fishes. Here, we propose an analytical framework which combines Lagrangian modeling, network theory, otolith analyses and biogeographical information to pinpoint and characterize larval sources which are then grouped into discrete spawning areas. Such well-delineated sources and their predetermined settlement sites allow improving the quantitative evaluations of both dispersal scales and connectivity patterns. To illustrate its added value, our approach is applied to two case-studies focusing on D. sargus and D. vulgaris in the Adriatic sea. We evidence robust correlations between otolith geochemistry and modelled spawning areas to assess their relative importance for the larval replenishment of the Apulian coast. Our results show that, contrary to D. sargus, D. vulgaris larvae originate from both eastern and western Adriatic shorelines. Our findings also suggest that dispersal distances and dispersal surfaces scale differently with the pelagic larval duration. Furthermore, almost 30% of D. sargus larvae and 10% of D. vulgaris larvae of the Apulian populations come from Tremiti marine protected area (MPA), exemplifying larval spill-over from MPAs to surrounding unprotected areas. This flexible multidisciplinary framework, which can be adjusted to other coastal fish and oceanic system, exploits the explanatory power of a model tuned and backed-up by observations to provide more reliable scientific basis for the management and conservation of marine ecosystems.

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Section: Exploiting Connectivity Information For Conservation Purposesmentioning

confidence: 99%

A multidisciplinary analytical framework to delineate spawning areas and quantify larval dispersal in coastal fish

Legrand

Franco

Ser‐Giacomi

et al. 2019

Marine Environmental Research

View full text Add to dashboard Cite

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“…Generally, alterations to larval supply of fisheries species, particularly recruitment‐limited species, could have severe economic and ecological implications at both global (Ramesh et al. ) and regional scales (e.g., the Dungeness crab Metacarcinus magister Table , Fig. E, F).…”

Section: Population and Community Impactsmentioning

confidence: 99%

Larval dispersal in a changing ocean with an emphasis on upwelling regions

et al. 2020

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Dispersal of benthic species in the sea is mediated primarily through small, vulnerable larvae that must survive minutes to months as members of the plankton community while being transported by strong, dynamic currents. As climate change alters ocean conditions, the dispersal of these larvae will be affected, with pervasive ecological and evolutionary consequences. We review the impacts of oceanic changes on larval transport, physiology, and behavior. We then discuss the implications for population connectivity and recruitment and evaluate life history strategies that will affect susceptibility to the effects of climate change on their dispersal patterns, with implications for understanding selective regimes in a future ocean. We find that physical oceanographic changes will impact dispersal by transporting larvae in different directions or inhibiting their movements while changing environmental factors, such as temperature, pH, salinity, oxygen, ultraviolet radiation, and turbidity, will affect the survival of larvae and alter their behavior. Reduced dispersal distance may make local adaptation more likely in well‐connected populations with high genetic variation while reduced dispersal success will lower recruitment with implications for fishery stocks. Increased dispersal may spur adaptation by increasing genetic diversity among previously disconnected populations as well as increasing the likelihood of range expansions. We hypothesize that species with planktotrophic (feeding), calcifying, or weakly swimming larvae with specialized adult habitats will be most affected by climate change. We also propose that the adaptive value of retentive larval behaviors may decrease where transport trajectories follow changing climate envelopes and increase where transport trajectories drive larvae toward increasingly unsuitable conditions. Our holistic framework, combined with knowledge of regional ocean conditions and larval traits, can be used to produce powerful predictions of expected impacts on larval dispersal as well as the consequences for connectivity, range expansion, or recruitment. Based on our findings, we recommend that future studies take a holistic view of dispersal incorporating biological and oceanographic impacts of climate change rather than solely focusing on oceanography or physiology. Genetic and paleontological techniques can be used to examine evolutionary impacts of altered dispersal in a future ocean, while museum collections and expedition records can inform modern‐day range shifts.

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“…Connectivity models now recognize fisheries as "small-world networks" where a few key spawning areas (nodes) supply larvae to many regions thereby increasing the risk of disproportionately widespread impact to regional sustainability from disturbance to just one of these pivotal sites (Claro, Lindeman, Kough, & Paris, 2019). Countries in West Africa, the Caribbean, Oceania, and Northern Europe have been predicted to be most vulnerable to disrupted flow of progeny from FSAs located in waters under the care of other nations, making it critical to understand where these important sites exist and the nature of their interdependencies (Ramesh, Rising, & Oremus, 2019 telemetry, and seascape genetics will help understand regional dispersal and retention patterns, population resilience to disturbance, and efficacy of conservation measures (Munguia-Vega et al, 2014) and assess the recovery potential of extirpated FSAs (Chollett et al, 2020). The geographic range of many tropical fishes is creeping poleward as a result of climate change.…”

Section: Fish Spawning Aggregations Transnational Connectivit Y Andmentioning

confidence: 99%

Life below water: Fish spawning aggregations as bright spots for a sustainable ocean

Pittman

Heyman

2020

CONSERVATION LETTERS

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Transient fish spawning aggregations (FSAs) are critical life-cycle events for many commercially important species, in which fish congregate in huge numbers to spawn at predictable times and places. This behavior makes them exceptionally vulnerable to fishing. The "illusion of plenty" and poor access to monitoring tools and techniques has resulted in some FSAs being overfished or unwittingly eliminated. We present a co-conservation network, formally linking site-focused partners who cooperatively monitor and actively manage multispecies FSAs. FSA sites and networks offer great potential as conservation bright spots to replenish fished populations, rehabilitate marine ecosystems, and ensure the flow of ecosystem services to the millions of people that rely upon them for their wellbeing. We call for urgent global recognition of FSAs as effective spatial nexus for addressing multiple interconnected global policy targets for a sustainable ocean. K E Y W O R D S adaptive management, ecological monitoring, fish habitat, fish spawning aggregations, fisheries management, protected areas, sustainable ocean

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The small world of global marine fisheries: The cross-boundary consequences of larval dispersal

Cited by 43 publications

References 38 publications

A multidisciplinary analytical framework to delineate spawning areas and quantify larval dispersal in coastal fish

A multidisciplinary analytical framework to delineate spawning areas and quantify larval dispersal in coastal fish

Larval dispersal in a changing ocean with an emphasis on upwelling regions

Life below water: Fish spawning aggregations as bright spots for a sustainable ocean

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