Everall et al al 2015 EE - mayfly phenology.pdf (1.4 MB)
Detecting phenology change in the mayfly Ephemera danica: responses to spatial and temporal water temperature variations
journal contribution
posted on 2015-06-03, 13:44 authored by Nicholas C. Everall, Matthew F. Johnson, Robert WilbyRobert Wilby, Cyril J. Bennett1. Rising water temperatures under climate change are expected to affect the phenology of aquatic insects, including the mayfly Ephemera danica Müller which is widespread throughout Europe. 2. To assess temporal and spatial variability in mayfly emergence, E. danica were monitored at two thermally contrasting reaches in the River Dove, English Peak District over the period 2007-2013. Inter-annual variations in growing degree days (GDDs) were modelled for an upstream site with intermittent spring flow supplementing main channel flow (Beresford Dale) and downstream site dominated by near constant discharges of cool groundwater (Dovedale). 3. A strong association exists between the emergence cycle of E. danica and GDDs at each site. Beresford Dale accumulated on average 374 more GDDs than Dovedale. After warm summers E. danica emerged after only 1year in Beresford Dale but began to revert to a bi-annual cycle after the particularly wet/cool year of 2012. In Dovedale, E. danica maintained a 2-year cycle throughout the monitoring period in spite of the phenology changes observed 8km upstream. 4. Data from the present study suggest that habitats near cool groundwater may provide important refugia for populations of insects, potentially delaying permanent shifts in phenology under climate change. However, an ability to detect changes in the thermal triggers and phenological response may be hindered by conventional spot sampling protocols.
Funding
The authors wish to thank The Wild Trout Trust, Beresford Fishery, Derbyshire County Angling Club, Peak District National Park Authority and Staffordshire Wildlife Trust for part-funding this work.
History
School
- Social Sciences
Department
- Geography and Environment
Published in
Ecological EntomologyVolume
40Issue
2Pages
95 - 105Citation
EVERALL, N.C. ... et al, 2015. Detecting phenology change in the mayfly Ephemera danica: responses to spatial and temporal water temperature variations. Ecological Entomology, 40 (2), pp.95-105.Publisher
Wiley Publishing / © The Royal Entomological SocietyVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2015Notes
This is the peer reviewed version of the article, which has been published in final form at http://dx.doi.org/10.1111/een.12164. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.ISSN
0307-6946eISSN
1365-2311Publisher version
Language
- en