Tag: fish

Coastal and marine, Perspectives, Practitioners

Jazz-band ecosystem monitoring

In this post Adel Heenan and Kelvin Gorospe discuss their recent Practitioner’s Perspective article ‘Ecosystem monitoring for ecosystem-based management: using a polycentric approach to balance information trade-offs‘ Long-term ecosystem monitoring can be used to take the pulse of an ecosystem, much like a routine check-up with your doctor. Medical analogies like this are common in our field, as we work for the Pacific Reef Assessment and Monitoring Program (RAMP) … Continue reading Jazz-band ecosystem monitoring

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Environmental DNA and crayfish management

In this post Matthew Dougherty discusses his recent paper ‘Environmental DNA (eDNA) detects the invasive rusty crayfish Orconectes rusticus at low abundances‘ Tangled buoy strings, lost traps, pinched fingers, sweaty brows, and boats smeared with beef liver: these images define the experiences of countless managers and scientists who use baited trapping to monitor crayfish invasions, especially in lakes of the upper Midwest, USA. While these … Continue reading Environmental DNA and crayfish management

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The effects of seals on Scottish cod stock recovery

In this post Robin Cook discusses his recent paper with Steven Holmes and Robert Fryer ‘Grey seal predation impairs recovery of an over-exploited fish stock’ Both seals and humans prey on fish and so potentially compete for the same resource. Such competition is vividly illustrated in the controversy surrounding the effect grey seals have on cod in a number of regions including Canada and the … Continue reading The effects of seals on Scottish cod stock recovery

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From economy to ecological management: Portfolio theory enlightens the performance of social-ecological systems

This guest post from David Angeler (@DGAngeler), Associate Editor for Journal of Applied Ecology on the paper “Performance of salmon fishery portfolios across western North America” by Jennifer Griffiths et al. (@JenAquatic @mark_scheuerell @SteveLindley831) Ecologists and managers are well aware of the reciprocal dependence of systems between people and nature. However, the linkages between social-ecological systems are complex and therefore difficult to measure. This limits … Continue reading From economy to ecological management: Portfolio theory enlightens the performance of social-ecological systems

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Managing native fish with environmental flows

Flow alteration is one of the most common threats to rivers and streams around the world. Alterations such as weirs, dams and water withdrawal for human uses tend to suppress natural flow variation causing a disconnection between rivers and floodplain wetlands. These changes to the natural hydrology of rivers can have detrimental effects for fish communities because many species of fish rely on periodic access to … Continue reading Managing native fish with environmental flows

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