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  • 1. Göthe, Emma
    et al.
    Lepori, Fabio
    Malmqvist, Björn
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Forestry affects food webs in northern Swedish coastal streams2009In: Fundamental and Applied Limnology, ISSN 1863-9135, Vol. 175, no 4, p. 281-294Article in journal (Refereed)
    Abstract [en]

    We investigated how riparian logging affects the food webs of coastal streams in northern Sweden by comparing streams surrounded either by clear-cuts or old-growth forests. Specific hypotheses were that: (i) algal standing stocks are higher in clear-cut streams, whereas detrital standing stocks are higher in old-growth streams; (ii) algal-based (autotrophic) pathways contribute more to consumer (aquatic insect) body carbon in clear-cut streams than in old-growth streams; (iii) a higher autotrophic contribution reflects a combination of numerical (increased abundance of herbivore taxa) and functional (shift in diet by generalist taxa) responses of insect taxa to logging; and (iv) potential predators function more strictly as true predators, and reduce propensity to omnivory in clear-cut relative to old-growth streams. The standing stocks of algae and fine particulate organic matter (FPOM) were similar between treatments, whereas the standing stock of coarse particulate organic matter (CPOM) was higher in old-growth streams. Stable isotope analysis suggested that the autochthonous contribution to aquatic insect carbon per individual taxon was greater in clear-cut than in old-growth streams; although the difference was not statistically conclusive the large effect size suggests that it is biologically meaningful. Greater reliance on autotrophic pathways in clear-cut streams seemed to be caused by a decrease in the relative consumption of detritus by the generalist species Leuctra hippopus, an increase in the abundance of the specialist herbivore Baetis rhodani, and a diffuse increase in the consumption of algae across all functional feeding groups except gathering-collectors. Resources and consumers were enriched in (15)N in clear-cut relative to old-growth streams, suggesting that forestry affects the microbial processing of organic nitrogen, which in turn causes an increased availability of (15)N to algae. The enrichment in (15)N in clear-cut relative to old-growth streams was apparent in all functional feeding groups except for gathering-collectors. In summary, our results show that riparian logging affects the balance of aquatic vs. terrestrial carbon sources and the cycling of nutrients in streams, with effects reverberating to the aquatic consumers.

  • 2.
    Mastrantuono, Luciana
    et al.
    Rome, Italy.
    Pilotto, Francesca
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Rome, Italy; Berlin, Germany.
    Rossopinti, Andrea
    Rome, Italy.
    Bazzanti, Marcello
    Rome, Italy.
    Solimini, Angelo G.
    Rome, Italy.
    Response of littoral macroinvertebrates to morphological disturbances in Mediterranean lakes: the case of Lake Piediluco (central Italy)2015In: Fundamental and Applied Limnology, ISSN 1863-9135, Vol. 186, no 4, p. 297-310, article id PA Umbria, 2005, Monografia 15/Caratterizzazione ambientale del lago di Piediluco, P1 dand J., 1983, Malacologia, V24, P277 ccardi R, 1955, Mem. Soc. Geogr. Ital, V22, P115 Farland B., 2010, Aquat. Conserv.: Mar. Freshw. Ecosyst., V20, P105 ring Daniel, 2013, HYDROBIOLOGIA, V704, P1 nziger R., 1995, Hydrobiologia, V301, P133 igal C, 2006, HYDROBIOLOGIA, V563, P371 Goff Elaine, 2012, FUNDAMENTAL AND APPLIED LIMNOLOGY, V180, P111Article in journal (Refereed)
    Abstract [en]

    The assessment of the impacts of human morphological alterations on lake ecological condition based on littoral benthic fauna is still in its infancy, especially in the Mediterranean area of Europe. Lake Piediluco is a riverine lake, sited in Central Italy, whose water level is strictly regulated for hydroelectric reasons and hence can be classified as a Heavily Modified Water Body (HMWB) according to the E.U. Water Framework Directive (WDF). Here, we aim at comparing the invertebrate assemblages among sites with a different degree of morphological alterations by identifying potential indicator species and metrics sensitive to morphological alterations, and by comparing the fauna composition collected using two sampling procedures (composite vs habitat-specific samples) with different processing times. Our results show that the invertebrate assemblages of Lake Piediluco differed according to the three types of shoreline alteration (natural, soft- and hard-altered sites) and this was more evident when we analyzed the habitat-specific samples. Several taxa, diversity and metrics based on the number of Ephemeroptera, Trichoptera, Odonata and Mollusca taxa (ETO and ETOM) are found to be sensitive to shoreline alterations and are candidates for inclusion in assessment metrics for WDF compliant monitoring of the ecological status of this lake. While habitat-specific sampling provided a more detailed picture of the assemblages, composite samples provided consistent results and could be used when processing cost is an issue.

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