Algal Ecology: Freshwater Benthic Ecosystem - download pdf or read online

By R. Jan Stevenson, Max L. Bothwell, Rex L. Lowe, James H. Thorp

ISBN-10: 0126684502

ISBN-13: 9780126684506

I've got used this publication lots in the course of my MSc undertaking on Algal groups, that it grew to become my own bible for all facets of benthic algal ecology. it is a very complete ebook, that's either fascinating and appropriate correct from the beginning until the very finish. All issues are good designed and illustrated and all in all it's very great to learn - not just for Ecologists like me.

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Sample text

Open water column measurements of DO are an advantage because they enable assessment of whole ecosystem net productivity, whereas chamber assays require measurement of individual habitat patches. , 1978). All DO and 14C methods are generally accepted and have value for productivity assessments at one spatial scale or another. The terminology for the mechanisms of benthic algal accumulation has not been consistently defined in the literature. The value of this conceptual approach and its increasing use calls for some clarification of terms for different measurements of algal accumulation on substrata.

In samples. So DM is a particularly poor indicator of benthic algal biomass when silt and inorganic deposition is great in samples, and AFDM is poor when detritus and heterotrophic organisms compose significant proportions of communities. Ash mass in samples, the portion of mass 14 R. Jan Stevenson TABLE H Advantages and Disadvantages of Using Different Measurements of Algal Community Biomass , . . . ,, Characteristic Pros Cons chl a (lag cm-2) Inexpensive, large literature base for comparison C, N, or P (lag cm-2) Dry mass (mg cm-2) Also used to assess nutrient status of cells Inexpensive, can also be used to determine ash mass and entrapped silt or ash-free dry mass Inexpensive, large literature base for comparison Also used to assess species composition and biovolume, large literature base for comparison Accurately assesses algal biomass Chromatic adaptation and nutrient limitation can bias estimates of biomass Includes biomass of other living and nonliving matter Includes mass of all inorganic and organic matter in sample Ash-free dry mass (mg cm-2) Cell density (cells cm-2) Biovolume (~m3 cm-2) Peak biomass , , ,, Good indicator of algal nuisance potential in a habitat , ,, ,,, Includes mass of all living and detrital matter Interspecific variation in cell sizes causes error in biomass estimates Most time-consuming, must account for error due to cell vacuoles Requires monitoring algal community development .

Benthos refers to organisms living on the "bottom" or associated with substrata. Wetzel (1983a) considers benthos to be the animals associated with any solid-liquid substratum. Common use of the term benthos includes most organisms associated with substrata in aquatic habitats: fish, macroscopic invertebrates and meiofauna, fungi, bacteria, and even hyporheic (below substratum surface) organisms. Periphyton and aufwuchs are also terms that are more or less synonymous with the term benthic algae.

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Algal Ecology: Freshwater Benthic Ecosystem by R. Jan Stevenson, Max L. Bothwell, Rex L. Lowe, James H. Thorp

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