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These pages are still under construction
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Indicator summary
Summary of indicator structure and function
| Indicator | Attribute | Purpose | If restricted to taxa, list which ones | Ecosystem applicability | Identified capability | Biological classification level | Response variable | Drivers | Robustness |
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| Temporal variability of total biomass | Tropic shifts; community Community structure | fisheriesFisheries | Should be applicable to all ecosystems | Demonstrable | Community; Ecosystem | Species-based; trophodynamicsTrophodynamics | Trophodynamics | Potentially medium to high |
Examples of how the indicators is used for ecosystem management and ecosystem status and trends
| Indicator examples | Current status and trends | Management objective/direction | Stakeholder/Public acceptability |
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| Examples of how the indicator is used. | Pick one of the following:
| Pick one of the following:
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Definition and/or background
The following is from Fulton et al (2004a) -
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The index is calculated as follows:
need to add equation 5.2
where CVi is the coefficient of variation for species i, σi is the standard deviation and x (need to have a line over the top of the x) is the and is the mean of the measured variable (biomass landings, CPUE and biomass) for species i. CVt is the sum of all the CVi.
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fisheries, birds and mammals
Taxa
Data required
The following is from Fulton et al 2004a -
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Should be applicable to all ecosystems, and has been applied to comparisons of fish communities in the Bay of Biscay and Gulf of Lions (Blanchard and Boucher 2001).
Identified capability
Biological classification level
Response variable
Drivers
Is there any additional information that would be of interest in regards to ecological drivers?
If not can leave this section blank and just fill in the table instead.
Robustness
The following is from Fulton et al 2004a -
Potentially medium to high: The main limitations relate to the use of CPUE data, which can be highly variable and inconsistent. As a result, accurate data on total biomass may not be recorded. Moreover, market forces, rather than just the ecological effects of fishing, can influence the catches (so catch shifts to planktivores from piscivores without a concomitant shift in the underlying system). It is also worth remembering that if a species goes extinct its CVi will be zero and any fluctuation in overall biomass will be greater than it. Thus, to be truly robust, this indicator requires testing on data sets derived from research surveys that are not linked to effort, and/or from data collected in unfished reference areas. It could also be useful to examine time series data of target species (which tend to be large piscivores), as this could give a measure of the total biomass variability over time in established fisheries and provide a snapshot of how the higher trophic levels, which regulate the energy flow, have varied. Lastly, estimating variability can require a lot of data, especially if it is to be separated from time trends in the data sets used (Rochet and Trenkel 2003).
Current status and trends
what was it like in an undisturbed/unexploited system?
how would it be expected to change?
which way is the indicator showing a population is going in? decreasing or increasing ??
Management strategies and/or objectives
define a standard set of management objectives?? ie from Indiseas
- Conservations biodiversity
- Ecosystem stability and resistance to perturbations
- ecosystem structure and functioning
- resource potential
has it been used in a management strategy? if so how?
relationship to management strategies/ objectives
Stakeholder/public acceptability
Acceptability with stakeholders
- by all stakeholder
- by the public
- understandable to the stakeholders
Associated links
Hyperlinks to organisations, databases, webportals, and ID books, that are associated with this indicator, if appropriate.
References
Fulton, E.A., Smith, A.D.M., Webb, H., and Slater, J. (2004a) Ecological indicators for the impacts of fishing on non-target species, communities and ecosystems: Review of potential indicators. AFMA Final Research Report, report Number R99/1546.
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Fulton, E.A., Fuller,M., Smith, A.D.M., and Punt, A. (2004) Ecological indicators of the ecosystem effects of fishing: Final report. AFMA Final Research Report, report Number R99/1546.
Possible references for updating this indicator
Citation
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