Diversity II - User questionnaire

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Diversity II - User questionnaire - Inland waters

Please fill in the following questionnaire in order to give us valuable feedback.

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General survey

We are interested in elaborating relationships between the geophysical parameters in our water quality products and biodiversity. These relationships may be general or lake-specific, and their relevance may be limited to certain boundary conditions or parameter ranges, and corresponding locations or periods.

Please describe in general terms but for each relevant parameter what relationships to biodiversity you expect.

Which parameters do you consider most important?

Trophic state

In general, increasing levels of nutrients and corresponding Chlorophyll-a (chl-a) levels favour high biodiversity. However, according to literature there can also be an upper trophic limit, beyond whose biodiversity tends to decline.

What is your general opinion on the relevance of chl-a and trophic levels for biodiversity of specific lake types, e.g. with regard to diversity in fish or macrophyte species?

Eutrophic lakes are often inhabited by relatively many fish and macrophyte species. But when few of them dominate, they become unbalanced systems that are considered unfavourable for biodiversity. Do you agree and can you further specify under which conditions such quantitative growth prevails?

Oligotrophic lakes are likely to consist of a smaller absolute number of species than more nutrient-rich lakes. Preservation of such clear-water adapted fish or benthic macrophytes is however essential for global biodiversity. How could this complexity be accounted for by means of the available indicators?

Floating leafed macrophytes often concur with high chl-a concentrations. How do you assess their relevance for biodiversity, also with regard to fish and invertebrates?

Could the temporal variability in chl-a be a valid indicator for biodiversity, e.g.:

as the decrease from one period to another (e.g. spring to summer)?

as temporarily low concentrations e.g. during certain invertebrate growth phases?

How may the depth of a lake affect the relevance of chl-a as a biodiversity indicator?

Product specifications

Product aggregation is constrained by the frequency of valid image acquisitions (2-10 per month) and the satellite operating time (2002-2012) and spatial resolution (300 m), but flexible within these limits. The current product specifications were chosen according to preliminary requirements, and can be modified to meet updated user recommendations.

Are the provided monthly means appropriate to resolve the relevant seasonal variability of the provided water properties?

In what part(s) of the year is the biodiversity relevance of the provided parameters highest?

Is the 10 years time series sufficient for the investigation of interannual trends? If so, are the provided annual means appropriate or should they be further aggregated to three-year epochs?

Are the lake-wise datasets sufficient, or should certain lakes be subdivided in separate basins according to local habitat properties?

Are the provided spatio-temporal averages appropriate, or should other statistical aggregation measures be added, such as maxima/minima or percentiles?

How do you assess the reliability of the provided parameters, and what validation level is required to make the products eligible for biodiversity studies at your organisation?

Correlation with field sampled water quality data

Correlation with field sampled biodiversity data (i.e. species counts)

Consistent and reasonable spatial and temporal gradients

Other:

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