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Effects of nutrients and fish on periphyton and plant biomass across a European latitudinal gradient

In English

Författare

  • Eloy Becares
  • Joan Goma
  • Margarita Fernandez-Alaez
  • Camino Fernandez-Alaez
  • Susana Romo
  • Maria R. Miracle
  • Annika Ståhl-Delbanco
  • Lars-Anders Hansson
  • Mikael Gyllström
  • Wouter J. Van de Bund
  • Ellen Van Donk
  • Timo Kairesalo
  • Jaana Hietala
  • Debbie Stephen
  • David Balayla
  • Brian Moss
Visa allt

Summary, in English

Replicated, factorial mesocosm experiments were conducted across Europe to study the effects of nutrient enrichment and fish density on macrophytes and on periphyton chlorophyll a (chl-a) with regard to latitude. Periphyton chl-a densities and plant decline were significantly related to nutrient loading in all countries. Fish effects were significant in a few sites only, mostly because of their contribution to the nutrient pool. A saturation-response type curve in periphyton chl-a with nutrients was found, and northern lakes achieved higher densities than southern lakes. Nutrient concentration and phytoplankton chl-a necessary for a 50% plant reduction followed a latitudinal gradient. Total phosphorus values for 50% plant disappearance were similar from Sweden (0.27 mg L-1) to northern Spain (0.35 mg L-1), but with a sharp increase in southern Spain (0.9 mg L-1). Planktonic chl-a values for 50% plant reduction increased monotonically from Sweden (30 mu g L-1s) to Valencia (150 mu g L-1). Longer plant growing-season, higher light intensities and temperature, and strong water-level fluctuations characteristic of southern latitudes can lead to greater persistence of macrophyte biomass at higher turbidities and nutrient concentration than in northern lakes. Results support the evidence that latitudinal differences in the functioning of shallow lakes should be considered in lake management and conservation policies.

Publiceringsår

2008

Språk

Engelska

Sidor

561-574

Publikation/Tidskrift/Serie

Aquatic Ecology

Volym

42

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

Springer

Ämne

  • Ecology

Nyckelord

  • Mesocosms
  • Latitude
  • Shallow lakes
  • Macrophytes
  • Periphyton
  • Nutrients
  • Fishes

Status

Published

Forskningsgrupp

  • Aquatic Ecology

ISBN/ISSN/Övrigt

  • ISSN: 1386-2588