Draft
These pages are still under construction.
Classification
where does it fit in the classification tree ? see other page (link)
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. “Biomass” is used here as a measure of “resource potential (Table 1). “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). Instead, “biomass” was used to compare biomass trends over time" (methods details page of http://www.indiseas.org/).
| Indicator use | Demonstrable (D) or Aspirational (A) | Category of indicator | Direction of change | Management objective/direction | Stakeholder acceptability |
|---|---|---|---|---|---|
| To measure biomass trend over time | D | Decreasing or ↓ | |||
| size-based, species-based, trophodynamics or environmental | decreasing, increasing, or arrows? |
Table categories details:
Indicator use
what does it indicate?
is it demonstrable or not?
ideally want them all to be demonstrative rather than aspirational ...
demonstrable = this definitely shows this by these studies, data sets, etc.
aspirational = this may show this we think but have no data or studies to back it up..which just think that it is a link that can be made.
category of indicator
size-based, species-based, trophodynamics or environmental
others????/
Direction of change
how would it be expected to change?
which way is the indicator showing a population is going in? ↑ ↓ ↔ or more curved/angled arrows
or should it be just decreasing or increasing and therefore make it as simple as possible??
Management strategies and/or objectives
define a standard set of management objectives?? ie from Indiseas
- Conservations biodiversity
- Ecosystem stability and resistance to pertubations
- ecosystem structure and functioning
- resource potential
has it been used in a management strategy? if so how?
relationship to management strategies/ objectives
Acceptability with stakeholders
- by all stakeholder
- by the public
- understandable to the stakeholders
Reference points
what was it like in an undisturbed system?
Robustness or variability? not sure which title yet...
what error level or variability is there?
what factors contribute to variability?
Associated links
Hyperlinks to organisations, databases, webportals, and ID books, that are associated with this indicator, if appropriate.
People
Not sure if I want this here yet...who would I actually link to?? scientist? mangers? both?
References
A list of references referred to on this page.
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 20, 2012 11:59
Versions: 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1
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