Integrating fishing and conservation in a risk framework: A stochastic population model to guide the proactive management of a threatened freshwater crayfish

Todd, Charles R.; Whiterod, Nick S.; Raymond, Scott; Zukowski, Sylvia; Asmus, Martin; Todd, Macgregor J.

doi:10.1002/aqc.2924

Cited by 16 publications

(20 citation statements)

References 48 publications

(96 reference statements)

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“…Community engagement during the design and development of conservation and management approaches has tended to focus on issues and views from stakeholders who derive extractive (harvest) or non‐extractive (tourism) economic value from the species (Hesselink, Goldstein, van Kempen, Garnett, & Dela, ; MEA, ; Todd et al, ; United Nations Environment Programme (UNEP), ). An emerging body of literature has uncovered how aquatic species support complex cultural relationships and non‐economic values across different sectors of society, fitting the definition of a CKS (Cristancho & Vining, ; Garibaldi & Turner, ; Noble et al, ), the present study showed that E. armatus is an important part of the cultural identity of stakeholders across the MDB, who view the species as a social–ecological keystone.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In response, relevant government jurisdictions have listed E. armatus as threatened, but have adopted varying approaches that range from full protection (in Australian Capital Territory and South Australia) to restricted recreational harvests (in New South Wales and Victoria). Although such regional declines in this freshwater crayfish may have had considerable social (Noble et al, 2016) and ecological implications for the affected regions, an understanding of these social impacts remains limited to fishing-related aspects (Todd et al, 2018 All the interviews were transcribed verbatim for analysis, except for one participant who declined to be recorded and for whom short-hand notes were used to record their responses. Descriptive data coding was conducted using HYPERRESEARCH 3.7.2 to organize and reduce the data.…”

Section: Introductionmentioning

confidence: 99%

“…Frequency of responses to whether Murray crayfish could be used as a conservation flagship within the Murray-Darling Basin, with representative quotes used in the legend to support each of the different class of answers stakeholder groups are united by a need to protect and sustain a key aquatic species such as E. armatus. Accordingly, this species could provide a flagship for collaboration and the development of more equitable aquatic conservation policies and actions.4.1 | Conserving culture with aquatic species managementCommunity engagement during the design and development of conservation and management approaches has tended to focus on issues and views from stakeholders who derive extractive (harvest) or nonextractive (tourism) economic value from the species(Hesselink, Goldstein, van Kempen, Garnett, & Dela, 2007; MEA, 2005;Todd et al, 2018; United Nations Environment Programme (UNEP), 2015).An emerging body of literature has uncovered how aquatic species support complex cultural relationships and non-economic values across different sectors of society, fitting the definition of a CKS(Cristancho & Vining, 2004;Garibaldi & Turner, 2004;Noble et al, 2016), the present study showed that E. armatus is an important part of the cultural identity of stakeholders across the MDB, who view the species as a social-ecological keystone. Aboriginal TraditionalOwners consider E. armatus to be a CKS by supporting subsistence harvests, ceremonies, totemic beliefs (e.g.…”

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confidence: 99%

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Looking beyond fishing: Conservation of keystone freshwater species to support a diversity of socio‐economic values

Noble

Fulton

Pittock

2018

Aquatic Conservation

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Keystone species can provide a focal point for designing conservation and management strategies that protect a diversity of social–ecological values in aquatic ecosystems; however, to avoid bias towards a subset of values associated with a single activity, such as fishing, stakeholder consultations must cover a spectrum of social perspectives. Using the Murray crayfish (Euastacus armatus) as a model, this study explored how Aboriginal Traditional Owners, landowners, tourism businesses, scientific researchers, non‐governmental organizations, and government agencies valued this threatened freshwater species across south‐east Australia. Qualitative methods revealed that E. armatus is a culturally significant species, targeted for fishing, but is also valued for a range of non‐extractive reasons that support social–ecological linkages between people and freshwater ecosystems. Perceived as an iconic species by most stakeholders, there was general support for E. armatus to be used as a flagship for conserving a spectrum of social–ecological values (e.g. Aboriginal Traditional Owner totem species), attached to their local freshwater ecosystems. Although stakeholders were conflicted over whether fishing should continue, four themes emerged on how to develop more equitable and effective conservation and management strategies: increased public education, co‐management with non‐government stakeholders, federal government co‐ordination, and spatial protection of critical areas. The protection of aquatic species in ways that support their full range of cultural, economic, and ecological values will require more bottom‐up (i.e. stakeholder‐led) approaches to conservation and management design. Broader stakeholder engagement and co‐management should reduce perceptions that local stakeholders are isolated from management processes, while increasing the capacity and confidence of managers to implement strategies that bolster both the social and ecological resilience of aquatic ecosystems.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Looking beyond fishing: Conservation of keystone freshwater species to support a diversity of socio‐economic values

Noble

Fulton

Pittock

2018

Aquatic Conservation

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“…It is also important to highlight the numerous applied functions of models (e.g., for the management of invasions), which have been used in several contexts. Some examples are the management of emerging riverine invaders [51] and guiding proactive management of threatened freshwater crayfish [52]. Moreover, the local or regional management of invasive crayfish populations can be aided by population dynamics models and management models.…”

Section: Modelsmentioning

confidence: 99%

Detection and Control of Invasive Freshwater Crayfish: From Traditional to Innovative Methods

et al. 2019

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Invasive alien species are widespread in freshwater systems compared to terrestrial ecosystems. Among crustaceans, crayfish in particular have been widely introduced and are considered a major threat to freshwater ecosystem functioning. New emerging techniques for detecting and controlling invasive crayfish and protecting endangered native species are; thus, now highly desirable and several are under evaluation. Important innovations have been developed in recent years for detection of both invasive and native crayfish, mainly through eDNA, which allows for the detection of the target species even at low abundance levels and when not directly observable. Forecasting models have also moved towards the creation of realistic invasion scenarios, allowing effective management plans to be developed in advance of invasions. The importance of monitoring the spread and impacts of crayfish and pathogens in developing national data and research networks is emphasised; here “citizen science” can also play a role. Emerging techniques are still being considered in the field of invasive crayfish control. Although for decades the main traditional techniques to manage invasive crayfish were solely based on trapping, since 2010 biological, biocidal, autocidal controls and sexual attractants, monosex populations, RNA interference, the sterile male release technique and oral delivery have all also been investigated for crayfish control. In this review, ongoing methodologies applied to the detection and management of invasive crayfish are discussed, highlighting their benefits and limitations.

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A population model provides support for management decisions, enables ongoing research and reinforces strong partnerships to manage a threatened freshwater crayfish

Whiterod¹,

Todd

Zukowski³

et al. 2020

Aquatic Conservation

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Many freshwater crayfish are threatened with extinction owing to varied threats such as urban development, pollution, over‐harvest, and climate change, as well as invasive species. A recently published manuscript in Aquatic Conservation: Marine and Freshwater Ecosystems described a stochastic, age‐based population model for the large freshwater crayfish Murray crayfish, Euastacus armatus, which is now threatened across much of its range in the Murray–Darling Basin in south‐eastern Australia. The model was constructed for three regional populations using the best available knowledge of life‐history traits such as longevity, size at onset of sexual maturity, fecundity, and survival, along with an account of density dependence. The model provides a framework to explore aspects of the conservation and management of the species, including assessing the influence of recreational harvest and environmental disturbance such as hypoxic blackwater, which affected the species significantly in 2010–2011. The application of the model provided retrospective justification for regulation amendments and highlighted biologically realistic timeframes for the recovery of impaired populations. This knowledge has assisted multi‐jurisdictional fisheries management agencies to undertake routine reviews of fishery regulations, as well as to inform stakeholders of the benefits of the regulation amendments. Refinement of the modelling framework has already provided additional insight and it is anticipated that future application will help to address other important management questions. The modelling outcomes are at present informing conservation assessment of the species under the Australian Government's Environmental Protection and Biodiversity Conservation Act 1999. The benefit of the population model can be summarized as: providing a framework to inform and justify management decisions; enabling additional research; and guiding conservation assessment. This has strengthened strong partnerships (between ecologists, managers, and recreational fishers) required to manage the species effectively.

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Integrating fishing and conservation in a risk framework: A stochastic population model to guide the proactive management of a threatened freshwater crayfish

Cited by 16 publications

References 48 publications

Looking beyond fishing: Conservation of keystone freshwater species to support a diversity of socio‐economic values

Looking beyond fishing: Conservation of keystone freshwater species to support a diversity of socio‐economic values

Detection and Control of Invasive Freshwater Crayfish: From Traditional to Innovative Methods

A population model provides support for management decisions, enables ongoing research and reinforces strong partnerships to manage a threatened freshwater crayfish

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