I work at all levels in freshwater ecosystems, ranging from population and community ecology through to ecosystem and aquatic landscape ecology, including work on fish and invertebrates in streams, lakes and wetlands. I’ve been particularly interested in aquatic food webs, predator-prey interactions, the influences of flow-related habitat size and disturbance in rivers, exchanges between aquatic and terrestrial ecosystems, and restoration and rehabilitation. This has included long-running studies in the upper Waimakariri River system in Canterbury, at the Rocky Mountain Biological Laboratory in Colorado and in agricultural streams of the Canterbury Plains. Important aspects include investigations of:
- effects of non-native trout on galaxiid fishes,
- riverscape configuration influences on fish and other aquatic biodiversity,
- changes in river habitat size (e.g. through alteration in flows) on river food webs,
- habitat drying on pond communities,
- connections between aquatic and terrestrial ecosystems (cross-ecosystem influences)
-restoration of agricultural streams in the Canterbury Waterway Rehabilitation Experiment (CAREX).
See the FERG (Freshwater Ecology Research Group) pages for more details on this research and my EcologyLive website (see link under Resources above) for photographs, stories and information of interest to a wider audience.
- Boddy NC., Fraley KM., Warburton HJ., Jellyman PG., Booker DJ., Kelly D. and McIntosh AR. (2020) Big impacts from small abstractions: The effects of surface water abstraction on freshwater fish assemblages. Aquatic Conservation: Marine and Freshwater Ecosystems 30(1): 159-172. http://dx.doi.org/10.1002/aqc.3232.
- Burdon FJ., McIntosh AR. and Harding JS. (2020) Mechanisms of trophic niche compression: Evidence from landscape disturbance. Journal of Animal Ecology 89(3): 730-744. http://dx.doi.org/10.1111/1365-2656.13142.
- Collins KE., Febria CM., Devlin HS., Hogsden KL., Warburton HJ., Goeller BC., McIntosh AR. and Harding JS. (2020) Trialling tools using hand-weeding, weed mat and artificial shading to control nuisance macrophyte growth at multiple scales in small agricultural waterways. New Zealand Journal of Marine and Freshwater Research 54(3): 512-526. http://dx.doi.org/10.1080/00288330.2020.1722185.
- Fraley KM., McHugh PA. and McIntosh AR. (2020) Influence of Maternally-Transferred Nitrogen and Carbon on Stable Isotope Ratios in Juvenile Chinook Salmon. North American Journal of Fisheries Management 40(1): 175-181. http://dx.doi.org/10.1002/nafm.10393.
- Fraley KM., Warburton HJ., Jellyman PG., Kelly D. and McIntosh AR. (2020) Do body mass and habitat factors predict trophic position in temperate stream fishes? Freshwater Science http://dx.doi.org/10.1086/708950.