Journal of Paleolimnology

, Volume 51, Issue 3, pp 325–341 | Cite as

A midge-salinity transfer function for inferring sea level change and landscape evolution in the Hudson Bay Lowlands, Manitoba, Canada

  • Trapper R. Dickson
  • Darren G. Bos
  • Marlow G. Pellatt
  • Ian R. Walker
Original paper
First Online:
Received:
Accepted:

Abstract

We compared water chemistry and environmental data with midge assemblage data, using multivariate analysis to assess the environmental gradients that limit midge (Chironomidae, Chaoboridae and Ceratopogonidae) distributions in the Hudson Bay Lowlands, northeastern Manitoba, Canada. Midge remains, comprising 62 taxa, were obtained from surficial sediments of 63 ponds. Ponds were sampled to maximize the salinity gradient. Specific conductance ranged from 46 to 29,000 μS cm−1. Proximity to the coast was a principal determinant of pond salinity, with ponds closer to Hudson Bay shoreline more saline that those farther away. Multivariate analysis indicated that midge distributions have a significant relationship (\( {\text{r}}_{\text{boot}}^{2} = 0.68 \)) with salinity in the data set. This work will allow paleolimnological inferences of midge community responses to changing sea level (i.e. salinity) via isostatic rebound within the Hudson Bay Lowlands, and will provide essential limnological information to scientists and managers in a region where understanding of aquatic ecosystems is limited. One undescribed midge taxon was dominant in ponds with the highest salinities and may be a key indicator for inferring highly saline environments.

Keywords

Midges Salinity Training set Hudson Bay Lowlands Paleoecology Sea-level change 
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Notes

Acknowledgments

Thanks to all who helped in the laboratory, picking nearly 4,000 sub-fossil head capsules from sediments (Kim Louden, Courtney Ek, Matthew Meehan, Kelsey Mills, Jordan Wu, Brooke McConnell, and Omar Mwangrai). We also thank the staff at the Churchill Northern Studies Centre for logistical support during this project. Thanks also to Larry Gogal and Gogal Air for the lift.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Trapper R. Dickson
    • 1
  • Darren G. Bos
    • 2
  • Marlow G. Pellatt
    • 2
    • 3
  • Ian R. Walker
    • 1
  1. 1.Biology, Earth and Environmental SciencesUniversity of British ColumbiaKelownaCanada
  2. 2.Parks Canada AgencyNatural Resource Conservation BranchVancouverCanada
  3. 3.School of Resource and Environmental ManagementSimon Fraser UniversityBurnabyCanada

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