Abstract
Stream algal indices of biotic integrity (IBIs) are generally based entirely or largely on diatoms, because non-diatom (“soft”) algae can be difficult to quantify and taxonomically challenging, thus calling into question their practicality and cost-effectiveness for use as bioindicators. Little has been published rigorously evaluating the strengths of diatom vs. soft algae-based indices, or how they compare to indices combining these assemblages. Using a set of ranked evaluation criteria, we compare indices of biotic integrity (IBIs) (developed for southern California streams) that incorporate different combinations of algal assemblages. We split a large dataset into independent “calibration” and “validation” subsets, then used the calibration subset to screen candidate metrics with respect to degree of responsiveness to anthropogenic stress, metric score distributions, and signal-to-noise ratio. The highest-performing metrics were combined into a total of 25 IBIs comprising either single-assemblage metrics (based on either diatoms or soft algae, including cyanobacteria) or combinations of metrics representing the two assemblages (for “hybrid IBIs”). Performance of all IBIs was assessed based on: responsiveness to anthropogenic stress (in terms of surrounding land uses and a composite water-chemistry gradient) using the validation data, and evaluated based on signal-to-noise ratio, metric redundancy, and degree of indifference to natural gradients. Hybrid IBIs performed best overall based on our evaluation. Single-assemblage IBIs ranked lower than hybrids vis-à-vis the abovementioned performance attributes, but may be considered appropriate for routine monitoring applications. Trade-offs inherent in the use of the different algal assemblages, and types of IBI, should be taken into consideration when designing an algae-based stream bioassessment program.
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Acknowledgments
The California State Water Resources Control Board Consolidated Grants and Surface Water Ambient Monitoring Program (SWAMP) provided funding and data. Bérengère Laslandes, Christina Vanderwerken, Karen McLaughlin, Mariska Brady, Amanda Elliott, Evan Thomas, Andrew Fields, Liesl Tiefenthaler, and Nicholas Miller assisted in the field/laboratory. The Southern California Stormwater Monitoring Coalition and SWAMP-funded Reference Condition Management Program and Perennial Stream Assessment provided data. Rebecca Schaffner, Andrew Rehn, and Jason May provided landscape data and analyses. Marco Sigala provided database assistance. Martha Sutula, Julie Berkman, John Van Sickle, Scott Rollins, Yangdong Pan, Kenneth Schiff, Danuta Bennett, and Sarah Spaulding provided advice on study design/data analysis, and Stephen Weisberg, Joshua Westfall, Scott Johnson, and two anonymous reviewers provided valuable comments that improved the manuscript. Laboratories of the University of California, Santa Barbara, Marine Science Institute and the University of Georgia Odum School of Ecology performed water chemistry analyses.
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Fetscher, A.E., Stancheva, R., Kociolek, J.P. et al. Development and comparison of stream indices of biotic integrity using diatoms vs. non-diatom algae vs. a combination. J Appl Phycol 26, 433–450 (2014). https://doi.org/10.1007/s10811-013-0088-2
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DOI: https://doi.org/10.1007/s10811-013-0088-2