caa a22 4500 445894008 CHVBK 20180317145625.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10750-011-0601-z doi (NATIONALLICENCE)springer-10.1007/s10750-011-0601-z Changes in fossil chironomid remains along a depth gradient: evidence for common faunal thresholds within lakes [Elektronische Daten] [Stefan Engels, Les Cwynar] Many environmental variables that are important for the development of chironomid larvae (such as water temperature, oxygen availability, and food quantity) are related to water depth, and a statistically strong relationship between chironomid distribution and water depth is therefore expected. This study focuses on the distribution of fossil chironomids in seven shallow lakes and one deep lake from the Plymouth Aquifer (Massachusetts, USA) and aims to assess the influence of water depth on chironomid assemblages within a lake. Multiple samples were taken per lake in order to study the distribution of fossil chironomid head capsules within a lake. Within each lake, the chironomid assemblages are diverse and the changes that are seen in the assemblages are strongly related to changes in water depth. Several thresholds (i.e., where species turnover abruptly changes) are identified in the assemblages, and most lakes show abrupt changes at about 1-2 and 5-7m water depth. In the deep lake, changes also occur at 9.6 and 15m depth. The distribution of many individual taxa is significantly correlated to water depth, and we show that the identification of different taxa within the genus Tanytarsus is important because different morphotypes show different responses to water depth. We conclude that the chironomid fauna is sensitive to changes in lake level, indicating that fossil chironomid assemblages can be used as a tool for quantitative reconstruction of lake level changes. Springer Science+Business Media B.V., 2011 Chironomids nationallicence Water depth nationallicence Kettlehole lakes nationallicence Massachusetts nationallicence Plymouth Aquifer nationallicence Engels Stefan Department of Biology, University of New Brunswick, E3B 5A3, Fredericton, NB, Canada aut Cwynar Les Department of Biology, University of New Brunswick, E3B 5A3, Fredericton, NB, Canada aut Hydrobiologia Springer Netherlands 665/1(2011-05-01), 15-38 0018-8158 665:1<15 2011 665 10750 https://doi.org/10.1007/s10750-011-0601-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0601-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Engels Stefan Department of Biology, University of New Brunswick, E3B 5A3, Fredericton, NB, Canada aut NATIONALLICENCE 700 1- Cwynar Les Department of Biology, University of New Brunswick, E3B 5A3, Fredericton, NB, Canada aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 665/1(2011-05-01), 15-38 0018-8158 665:1<15 2011 665 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer