Communicating changes in state of the southern Benguela ecosystem using trophic, model-derived indicators

Shannon, Lynne J.; Osman, W; Jarre, Astrid

doi:10.3354/meps10879

Cited by 10 publications

(4 citation statements)

References 38 publications

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“…There are other works that have attempted to provide decision trees for managing LMRs beyond the risk assessments noted above. For instance, changes to migration (Karp, Peterson, Lynch, & Griffis, ; Link, Nye, & Hare, ; Pinnegar et al, ), changes due to climate change (Allison et al, ; Cinner et al, , ; Hare et al, ; Karp et al, ), overfishing (Cope & Punt, ; Dunn et al, ; Fletcher, ) or changes due to predation (Rochet et al, ; Shannon, Osman, & Jarre, ) have all in many ways served as precursors to the framework noted here. Yet none of those has attempted to tackle the full range of factors that influence LMR populations simultaneously.…”

Section: Discussionmentioning

confidence: 99%

Changing how we approach fisheries: A first attempt at an operational framework for ecosystem approaches to fisheries management

et al. 2020

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The increasing need to account for the many factors that influence fish population dynamics, particularly those external to the population, has led to repeated calls for an ecosystem approach to fisheries management (EAFM). Yet systematically and clearly addressing these factors, and hence implementing EAFM, has suffered from a lack of clear operational guidance. Here, we propose 13 main factors (shift in location, migration route or timing, overfishing (three types), decrease in physiology, increase in predation, increase in competition, decrease in prey availability, increase in disease or parasites and a decline in habitat quality or habitat quantity) that can negatively influence fish populations via mechanisms readily observable in ~20 population features. Using these features as part of a diagnostic framework, we develop flow charts that link probable mechanism(s) underlying population change to the most judicious management actions. We then apply the framework for example case studies that have well‐known and documented population dynamics. To our knowledge, this is the first attempt to provide a clearly defined matrix of all the probable responses to the most common factors influencing fish populations, and to examine possible diagnostics simultaneously, comparatively and relatively in an attempt to elucidate the most probable mechanisms responsible. The framework we propose aims to operationalize EAFM, thereby not only better diagnosing factors influencing fish populations, but also suggesting the most appropriate management interventions, and ultimately leading to improved fisheries. We assert the framework proposed should result in both better use of limited analytical and observational resources and more tailored and effective management actions.

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Section: Discussionmentioning

confidence: 99%

Changing how we approach fisheries: A first attempt at an operational framework for ecosystem approaches to fisheries management

et al. 2020

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“…compensatory) effects ('tradeoffs' in Link 2010 Pranovi et al (2014) develop a new method to assess ecosystem changes after major perturbations; from a theoretical point of view, a perturbed ecosystem should lower the stored, cumulative biomass and 'stretch out' across TLs (Pranovi et al 2014). Shannon et al (2014b) analyzed the outputs of 5 ecosystem models for the southern Benguela Current to communicate with stakeholders and reach consensus on management decisions.…”

Section: Managementmentioning

confidence: 99%

Trophodynamics in marine ecology: 70 years after Lindeman

Libralato¹,

Pranovi²,

Στεργίου³

et al. 2014

Mar. Ecol. Prog. Ser.

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The seminal work of Lindeman (1942), 'The trophic-dynamic aspect of ecology' (Ecology 23:399), has been an important starting point for the holistic view of ecosystem trophodynamics, but it was initially seldom applied to marine ecosystems. Over the past 70 years, research on marine trophodynamics has become more widespread, producing a variety of analytical methods, and increasing our understanding of marine ecosystem functioning. Yet difficulties remain in transforming this body of knowledge into operational management of marine ecosystems and marine resources. This Theme Section on 'Trophodynamics in marine ecology' documents recent advances and lessons learned over the past 70 years, and provides an opportunity to reflect on future directions for marine research.

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“…Important progress has particularly been made in terms of the ecological dimension of an EAF, with countless studies assessing the impacts of fishing on the biological components of ecosystems. A key way in which this progress has been facilitated is through the use of suitable suites of ecosystem indicators, which allow the assessment of states and trends in marine ecosystems (e.g., Jennings et al 2002, Anticamara et al 2011, Shannon et al 2014a, Coll et al 2016. Such indicators reflect key ecosystem properties and can be both model-and survey-based.…”

Section: Introductionmentioning

confidence: 99%

A comparative framework to support an ecosystem approach to fisheries in a global context

Lockerbie¹,

Shannon²,

Lynam³

et al. 2020

E&S

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Although an ecosystem approach to fisheries has been recognized as a means of progressing toward sustainable fishing, successful implementation of this approach has been limited. However, one way in which progress has been made is through the use of suites of indicators. Decision tree frameworks can be used to incorporate trends in ecological, fishing, and environmental indicators into ecosystem assessments. A relatively generic decision tree framework has been developed and successfully applied to multiple ecosystems. This framework incorporates trends in indicators, as well as the impacts of fishing pressure and environmental variability on ecological indicators in order to assess the state of each ecosystem. The inclusion of ecosystem expert knowledge from the outset ensures trends are correctly interpreted and allows analyses to contribute to global comparisons in a robust and meaningful manner. Although ecological and environmental indicators are well developed, those addressing the human dimensions of marine ecosystems are less so. This framework holds the potential to incorporate such indicators in order to fully assess marine ecosystems in a comparative context. Such assessments could help ensure food security from marine resources into the future as well as ensuring the well-being of coastal communities. Here critical review of the potential value of this framework has been conducted, with its usefulness emphasized in the similarities it holds, and in the contribution it could make, to current global methods of ecosystem assessments.

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Communicating changes in state of the southern Benguela ecosystem using trophic, model-derived indicators

Cited by 10 publications

References 38 publications

Changing how we approach fisheries: A first attempt at an operational framework for ecosystem approaches to fisheries management

Changing how we approach fisheries: A first attempt at an operational framework for ecosystem approaches to fisheries management

Trophodynamics in marine ecology: 70 years after Lindeman

A comparative framework to support an ecosystem approach to fisheries in a global context

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