Draft
These pages are still under construction.
Classification
where does it fit in the classification tree ?
this will be a gliffy diagram only
| Indicator | Ecological group that uses this indicator | Certainty | Level of indicator (or Classification?) | Category of indicator | Direction of change | Ecosystem applicability | Robustness or variability | Management objective/direction | Stakeholder/Public acceptability | Reference(s) | wiki page status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| To measure biomass trend over time | Species-based | Decreasing | Resource Potential | Widely accepted | |||||||
| what is it? | Pick one or more of the following:
| Demonstrable (D) or Aspirational (A) based on Observations, speculation, or association | Pick one of the following:
| Pick one of the following:
| Pick one of the following:
or should it be deteriorating, improving, stable, unclear
| where can this indicator be used? all over or just locally ie:
| what error level or variability is there? robustness rating of low, medium or high for each indicator | Pick one of the following:
| Pick one of the following:
| Pick one of the following:
|
Attribute
Definition
"Total biomass of surveyed species is a conservative property of an ecosystem; as species are fished and their biomass reduced, other species increase in abundance and “replace” these species in the foodweb. With the removal of top predators lower trophic levels can be expected to increase. Thus changes in total biomass can be reflective of changes in ecosystem productivity." (methods details page of http://www.indiseas.org/).
Data required
Category of indicator
size-based, species-based, trophodynamics or environmental
others????/
environmental drivers are are most likely related to total system biomass and biomass of specific biological groups variables, (Fu et al 2012).
trophodynamic drivers are most relevant to the mean trophic level of community and the demersal-to-pelagic biomass ratio (Fu et al 2012).
Direction of change (Reference points, trajectories or directions for indicator)
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 ??
Robustness and Certainty
“Biomass” was not used to characterise the ecosystem state since survey data does not provide absolute estimates of biomass and thus is not comparable between species or ecosystems (due to differences in species catchability and surveys).
what error level or variability is there?
what factors contribute to variability?
is there were could include discussion about type I and II errors...or are we talking statistical errors in calculating the indicator? or both?
Management strategies and/or objectives
Resource Potential
Widely Accepted by stakeholders
Associated links
Indicators for the Seas - http://www.indiseas.org
People
Not sure if I want this here yet...who would I actually link to?? scientist? mangers? both?
References
Methods details page http://www.indiseas.org/, accessed 20/08/2012.
Background reading
Other references that would be useful to read in regard to the indicator referred to on this page.
Citation
Please cite this page as:
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Page created by:Shavawn Donoghue
Last modified on: Aug 30, 2012 16:20
Versions: 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1
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