Journal article

Hydrological controls on oviposition habitat are associated with egg-laying phenology of some caddisflies

Jill Lancaster, Stephen P Rice, Louise Slater, Rebecca E Lester, Barbara J Downes

Freshwater Biology | Wiley | Published : 2021


Abstract 1. Seasonal variation in resource availability can have strong effects on life histories and population densities. Emergent rocks (ERs) are an essential oviposition resource for multiple species of stream insects. The availability of ERs depends upon water depth and clast size, which vary with discharge and river geomorphology, respectively. Recruitment success for populations may depend on whether peak egg-laying periods occur at times when ER are also abundant. For multiple species that oviposit on ER, we tested whether seasonal fluctuations in ER abundance were concurrent with oviposition phenology. We also tested whether high discharge drowned ERs for sufficiently long periods t..

View full abstract


Awarded by Australian Research Council

Funding Acknowledgements

We are grateful to various people for their assistance in the field, and to Georgia Dwyer in particular for her help during the phenology survey. Thanks to Peter Grant for facilitating access to Snobs Creek. This research was support by a Discovery grant from the Australian Research Council (DP 160102262) awarded to B.D., R.L., and S. R. Field work was carried out in conjunction with a Research Permit (No. 10007855) under the National Parks Act (Australia), from the Department of Environment, Land, Water and Planning, Victoria.