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© 2016. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

To predict the response of aquatic ecosystems to future global climate change, data on the ecology and distribution of keystone groups in freshwater ecosystems are needed. In contrast to mid- and high-latitude zones, such data are scarce across tropical South America (Neotropics). We present the distribution and diversity of chironomid species using surface sediments of 59 lakes from the Andes to the Amazon (0.1–17°S and 64–78°W) within the Neotropics. We assess the spatial variation in community assemblages and identify the key variables influencing the distributional patterns. The relationships between environmental variables (pH, conductivity, depth, and sediment organic content), climatic data, and chironomid assemblages were assessed using multivariate statistics (detrended correspondence analysis and canonical correspondence analysis). Climatic parameters (temperature and precipitation) were most significant in describing the variance in chironomid assemblages. Temperature and precipitation are both predicted to change under future climate change scenarios in the tropical Andes. Our findings suggest taxa of Orthocladiinae, which show a preference to cold high-elevation oligotrophic lakes, will likely see range contraction under future anthropogenic-induced climate change. Taxa abundant in areas of high precipitation, such as Micropsectra and Phaenopsectra, will likely become restricted to the inner tropical Andes, as the outer tropical Andes become drier. The sensitivity of chironomids to climate parameters makes them important bio-indicators of regional climate change in the Neotropics. Furthermore, the distribution of chironomid taxa presented here is a vital first step toward providing urgently needed autecological data for interpreting fossil chironomid records of past ecological and climate change from the tropical Andes.

Details

Title
Environmental controls on the distribution and diversity of lentic Chironomidae (Insecta: Diptera) across an altitudinal gradient in tropical South America
Author
Matthews-Bird, Frazer 1 ; Gosling, William D 2 ; Coe, Angela L 1 ; Bush, Mark 3 ; Mayle, Francis E 4 ; Axford, Yarrow 5 ; Brooks, Stephen J 6 

 Environment, Earth & Ecosystems, The Open University, Walton Hall, Milton Keynes, UK 
 Environment, Earth & Ecosystems, The Open University, Walton Hall, Milton Keynes, UK; Palaeoecology & Landscape Ecology, Institute of Biodiversity & Ecosystem Dynamics (IBED), University of Amsterdam, Amsterdam, The Netherlands 
 Biological Sciences, Florida Institute of Technology, Melbourne, Florida, 32901 
 Department of Geography and Environmental Science (SAGES), Centre for Past Climate Change, University of Reading, Reading, UK 
 Department of Earth and Planetary Sciences, Northwestern University, Evanston, Illinois 
 Department of Life Sciences, Natural History Museum, London, UK 
Pages
91-112
Section
Original Research
Publication year
2016
Publication date
Jan 2016
Publisher
John Wiley & Sons, Inc.
e-ISSN
20457758
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2290577030
Copyright
© 2016. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.