TY - JOUR
T1 - Subfossil Cladocera in relation to contemporary environmental variables in 54 Pan-European lakes
AU - Bjerring, R.
AU - Becares, E.
AU - Declerck, S.
AU - Gross, Elisabeth M.
AU - Hansson, L-A.
AU - Kairesalo, T.
AU - Nykanen, M.
AU - Halkiewicz, A.
AU - Kornijow, R.
AU - Conde-Porcuna, J-M.
AU - Seferlis, M.
AU - Noges, T.
AU - Moss, B.
AU - Amsinck, S. L.
AU - Odgaard, B. V.
AU - Jeppesen, Erik
N1 - WOS:000270613600018
ISI Document Delivery No.: 504JY Times Cited: 50 Cited Reference Count: 68 Bjerring, Rikke Becares, Eloy Declerck, Steven Gross, Elisabeth M. Hansson, Lars-Anders Kairesalo, Timo Nykanen, Mirva Halkiewicz, Anna Kornijow, Ryszard Conde-Porcuna, Jose M. Seferlis, Miltiadis Noges, Tiina Moss, Brian Amsinck, Susanne Lildal Odgaard, Bent Vad Jeppesen, Erik Jeppesen, Erik/A-4463-2012; Odgaard, Bent/A-4838-2012; Declerck, Steven/E-4338-2010; Becares, Eloy/H-6361-2015; Bjerring, Rikke/J-4869-2013; Conde-Porcuna, Jose/L-9665-2014 Jeppesen, Erik/0000-0002-0542-369X; Declerck, Steven/0000-0001-6179-667X; Bjerring, Rikke/0000-0003-0393-3044; Conde-Porcuna, Jose/0000-0002-5074-2796; Hansson, Lars-Anders/0000-0002-3035-1317; Becares, Eloy/0000-0002-7123-3579; Gross, Elisabeth Maria/0000-0002-9392-8582 EU [EVK1-CT1999-00039, EVK2-CT-1999-00046, GOCE-CT-2003-505540]; Research Council for Nature and Universe [272-08-0406]; SOAS (International School of Aquatic Science, University of Aarhus, Denmark) We are grateful to G. Velle, R.K. Johnson and an anonymous reviewer for their valuable comments improving earlier versions of the manuscript. We thank Karina Jensen for her contribution to the identification of sedimentary cladoceran remains as well as Soren Erik Larsen for performing the rarefraction analysis and statistical guidance. Also thanks to Anne Mette Poulsen for manuscript editing, Ane Kjeldgaard for producing the geographical map and Tinna Christensen for figure layout. The project was supported by the EU-funded projects ECOFRAME (EVK1-CT1999-00039), BIOMAN (EVK2-CT-1999-00046) and EUROLIMPACS (GOCE-CT-2003-505540) as well as the DK-funded CLEAR project (a Villum Kann Rasmussen Centre of Excellence project), The Research Council for Nature and Universe (272-08-0406) and SOAS (International School of Aquatic Science, University of Aarhus, Denmark). This paper is also a result of the Danish Galathea 3 expedition funded by The Danish Agency for Science, Technology and Innovation and represents Galathea publication No. P30. 50 5 29 Wiley-blackwell publishing, inc Malden
6
PY - 2009
Y1 - 2009
N2 - P>1. Changes in cladoceran subfossils in the surface sediments of 54 shallow lakes were studied along a European latitude gradient (36-68 degrees N). Multivariate methods, such as regression trees and ordination, were applied to explore the relationships between cladoceran taxa distribution and contemporary environmental variables, with special focus on the impact of climate. 2. Multivariate regression tree analysis showed distinct differences in cladoceran community structure and lake characteristics along the latitude gradient, identifying three groups: (i) northern lakes characterised by low annual mean temperature, conductivity, nutrient concentrations and fish abundance, (ii) southern, macrophyte rich, warm water lakes with high conductivity and high fish abundance and (iii) Mid-European lakes at intermediate latitudes with intermediate conductivities, trophic state and temperatures. 3. Large-sized, pelagic species dominated a group of seven northern lakes with low conductivity, where acid-tolerant species were also occasionally abundant. Small-sized, benthic-associated species dominated a group of five warm water lakes with high conductivity. Cladoceran communities generally showed low species-specific preferences for habitat and environmental conditions in the Mid-European group of lakes. Taxon richness was low in the southern-most, high-conductivity lakes as well as in the two northern-most sub-arctic lakes. 4. The proportion of cladoceran resting eggs relative to body shields was high in the northern lakes, and linearly (negatively) related to both temperature and Chl a, indicating that both cold climate (short growing season) and low food availability induce high ephippia production. 5. Latitude and, implicitly, temperature were strongly correlated with conductivity and nutrient concentrations, highlighting the difficulties of disentangling a direct climate signal from indirect effects of climate, such as changes in fish community structure and human-related impacts, when a latitude gradient is used as a climate proxy. Future studies should focus on the interrelationships between latitude and gradients in nutrient concentration and conductivity.
AB - P>1. Changes in cladoceran subfossils in the surface sediments of 54 shallow lakes were studied along a European latitude gradient (36-68 degrees N). Multivariate methods, such as regression trees and ordination, were applied to explore the relationships between cladoceran taxa distribution and contemporary environmental variables, with special focus on the impact of climate. 2. Multivariate regression tree analysis showed distinct differences in cladoceran community structure and lake characteristics along the latitude gradient, identifying three groups: (i) northern lakes characterised by low annual mean temperature, conductivity, nutrient concentrations and fish abundance, (ii) southern, macrophyte rich, warm water lakes with high conductivity and high fish abundance and (iii) Mid-European lakes at intermediate latitudes with intermediate conductivities, trophic state and temperatures. 3. Large-sized, pelagic species dominated a group of seven northern lakes with low conductivity, where acid-tolerant species were also occasionally abundant. Small-sized, benthic-associated species dominated a group of five warm water lakes with high conductivity. Cladoceran communities generally showed low species-specific preferences for habitat and environmental conditions in the Mid-European group of lakes. Taxon richness was low in the southern-most, high-conductivity lakes as well as in the two northern-most sub-arctic lakes. 4. The proportion of cladoceran resting eggs relative to body shields was high in the northern lakes, and linearly (negatively) related to both temperature and Chl a, indicating that both cold climate (short growing season) and low food availability induce high ephippia production. 5. Latitude and, implicitly, temperature were strongly correlated with conductivity and nutrient concentrations, highlighting the difficulties of disentangling a direct climate signal from indirect effects of climate, such as changes in fish community structure and human-related impacts, when a latitude gradient is used as a climate proxy. Future studies should focus on the interrelationships between latitude and gradients in nutrient concentration and conductivity.
KW - canonical correspondence analysis ephippia multivariate regression analysis species richness zooplankton structure latitudinal diversity gradient shallow mediterranean lakes community structure brackish lakes crustacean zooplankton planktivorous fish regr
U2 - 10.1111/j.1365-2427.2009.02252.x
DO - 10.1111/j.1365-2427.2009.02252.x
M3 - Article
SN - 0046-5070
VL - 54
SP - 2401
EP - 2417
JO - Freshwater Biology
JF - Freshwater Biology
IS - 11
ER -