Fottea 10(1): 115-128, 2010 | DOI: 10.5507/fot.2010.006

A comparison between diatom assemblages in two groups of carbonate, low-altitude springs with different levels of anthropogenic disturbances.

Nicola Angeli1, Marco Cantonati1, Daniel Spitale1, Horst Lange-Bertalot2
1 Museo Tridentino di Scienze Naturali, Limnology and Phycology Section, Via Calepina 14, I-38100 Trento, Italy
2 Institute for Ecology, Evolution, Diversity, University of Frankfurt, Siesmayerstraße 70, and Senckenberg Research Institute, Senckenberganlage 31-33, D-60054 Frankfurt/M., Germany

Since several decades diatoms are increasingly used for the assessment of the trophic status of different freshwater ecosystems. However, spring habitats have been only marginally considered concerning this topic. The purpose of this research was to compare the diatom assemblages of two groups of carbonate, low-altitude springs, affected by different levels of anthropogenic disturbances. Between 2005 and 2008, diatoms were sampled in 57 low-altitude, carbonate springs, keeping separate the main microhabitats (stones and bryophytes), and assessing an extensive number of morphological, physical, and chemical variables. Two datasets were considered for the present paper: the first (CESSPA, N = 25) includes carbonate springs located within the River Adige catchment, the second (CRENODAT selected springs, N = 32) includes springs located not exclusively within the same basin, and very similar to the previous ones as regards lithological substratum, altitude range, shading. Trophic and saprobity indices, together with multivariate techniques, were used to assess differences between the diatom assemblages in the two datasets. Indices revealed higher trophic and saprobic levels for the CESSPA springs than for the other group (CRENODAT). Values of the Shannon-Wiener diversity index were similar for the two groups while the average richness was slightly higher in nature-near springs (CRENODAT); higher percentages of endangered or rare taxa (Red List) were found only in the nature-near springs. The main impacts affecting the
CESSPA springs were found to be both anthropogenic disturbances, such us water abstraction and spring-bed modification, and higher nitrate values. The importance of the fine tuning of diatom-based bioassessment methods in spring habitats is stressed.

Keywords: springs, diatoms, nitrates, morphology, carbonate substratum, eutrophication, low altitude, anthropogenic impacts

Received: May 9, 2009; Accepted: August 11, 2009; Published: March 1, 2010Show citation

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Angeli, N., Cantonati, M., Spitale, D., & Lange-Bertalot, H. (2010). A comparison between diatom assemblages in two groups of carbonate, low-altitude springs with different levels of anthropogenic disturbances. Fottea, 10(1), 115-128. doi: 10.5507/fot.2010.006
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