Using ecological indicators in the context of an ecosystem approach to fisheries for data-limited fisheries

Annual fish landings for the Greek seas were analysed for the period 1982–2007 and classified into exploitation categories based on a catch‐based stock classification method. In 2007, about 65% of the Greek stock were characterised as overfished, 32% as fully exploited and only 3% were characterised as developing; collapsed stocks were not recorded. The cumulative percentage of fully exploited and overfished stocks has been increasing over the past 20 years suggesting overexploitation of resources. The results were contrasted against total landings, the fishing‐in‐balance index (FiB) and fishing effort, and some irregularities on the dataset were explained based on current legislation and management measures. A positive correlation between FiB and total fishing effort confirmed the expansion of the Greek fisheries up to 1994, but contraction thereafter. The results suggest that the apparently stable overall catches and decreasing effort may be deceiving, as they hide an underlying pattern of overexploitation in some of the stocks. It was concluded that the Greek fisheries are no longer sustainable and radical management measures are needed.

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“…and the catch per unit of effort (e.g. Ye et al 2011), which are most probably the effects of overfishing.…”

Section: Methodsmentioning

confidence: 99%

Assessing the state of Greek marine fisheries resources

Tsikliras

Tsiros

Στεργίου

2012

Fisheries Management Eco

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“…Also, deep-sea fisheries are generally data-poor, and many deepwater species are also difficult to age reliably (Lorance et al, 2011). Ye et al (2011) point out that to overcome the data limitation and absence of modelling support, simple indicators have to be used to assess the current state and monitor changes of the fishery and its ecosystem. In this sense, Patrick et al (2010) outlined the use of productivity and susceptibility analysis (PSA) to assess for deep-sea species.…”

Section: Discussionmentioning

confidence: 99%

Deep-sea fish assemblages in the Colombian Caribbean Sea

2012

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“…Monitored indicators are often either qualitatively or quantitatively summarized to compare with cultural, ecological, economic or other resource values (Metcalf et al 2011;Ye et al 2011). Specifically, reference points (RPs) are defined to reflect critical values of indicators that are believed to have biological or management significance (see Tables 1 and 2; Prager et al 2003;Caddy 2004;Butterworth 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Essington (2010); Piet et al (2010); Ye et al (2011) Management strategy evaluation (MSE) Simulation testing of alternative management actions and assessment programmes to anticipate policy performance relative to specified metrics Kraak et al (2010); Butterworth et al (2010); Bunnefeld et al (2011) Model A simplification of reality, which may take a conceptual, qualitative, or quantitative form Irwin et al (2011) become more stakeholder driven and embrace more holistic multi-species or ecosystem-based philosophies (Metcalf et al 2011;Ye et al 2011). In particular, multiple-objective decision making requires an ability to evaluate potential trade-offs between sometimes conflicting values represented by RPs when choosing among available management actions McClanahan et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…As a result, naturalresource management is increasingly turning to structured and participatory processes for providing science-based decision support. This movement has prompted a recent and ongoing convergence of like-minded approaches for conducting formal options analysis (for example, management strategy evaluation and structured decision making; Table 1) in support of conservation and management of resources ranging from severely data-limited to extremely economically valuable (Dowling et al 2008;Bunnefeld et al 2011;Ye et al 2011;Zhang et al 2013). We have found it helpful to consider the use of RPs from the perspective of structured decision making (SDM) and adaptive management (AM), especially for identifying situations in which RPs relate to different concepts within a decision-making context.…”

Section: Introductionmentioning

confidence: 99%

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Consideration of reference points for the management of renewable resources under an adaptive management paradigm

Irwin

Conroy

2013

Envir. Conserv.

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SUMMARYThe success of natural resource management depends on monitoring, assessment and enforcement. In support of these efforts, reference points (RPs) are often viewed as critical values of managementrelevant indicators. This paper considers RPs from the standpoint of objective-driven decision making in dynamic resource systems, guided by principles of structured decision making (SDM) and adaptive resource management (AM). During the development of natural resource policy, RPs have been variously treated as either 'targets' or 'triggers'. Under a SDM/AM paradigm, target RPs correspond approximately to value-based objectives, which may in turn be either of fundamental interest to stakeholders or intermediaries to other central objectives. By contrast, trigger RPs correspond to decision rules that are presumed to lead to desirable outcomes (such as the programme targets). Casting RPs as triggers or targets within a SDM framework is helpful towards clarifying why (or whether) a particular metric is appropriate. Further, the benefits of a SDM/AM process include elucidation of underlying untested assumptions that may reveal alternative metrics for use as RPs. Likewise, a structured decision-analytic framework may also reveal that failure to achieve management goals is not because the metrics are wrong, but because the decision-making process in which they are embedded is insufficiently robust to uncertainty, is not efficiently directed at producing a resource objective, or is incapable of adaptation to new knowledge.

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Using ecological indicators in the context of an ecosystem approach to fisheries for data-limited fisheries

Cited by 23 publications

References 26 publications

Assessing the state of Greek marine fisheries resources

Assessing the state of Greek marine fisheries resources

Deep-sea fish assemblages in the Colombian Caribbean Sea

Consideration of reference points for the management of renewable resources under an adaptive management paradigm

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