2026-09-19T18:45:29.082777800Zhttps://opus.uleth.ca/server/oai/requestoai:opus.uleth.ca:10133/61552022-03-25T15:31:41Zcom_10133_3346com_10133_1com_10133_296col_10133_3347col_10133_298
ULethbridge OPUS Repository
supervisor
Goater, Cameron P.
author
Hirtle, Sarah Valerie
author
University of Lethbridge. Faculty of Arts and Science
2022-03-09T16:27:35Z
2022-03-09T16:27:35Z
2021
https://hdl.handle.net/10133/6155
Individual hosts are often infected with multiple parasite species or strains simultaneously. Co-occurring parasites can profoundly impact each other and their hosts via interspecific interactions. To further our understanding of co-infection in wildlife, I censused the parasite communities of fathead minnows (Pimephales promelas) from southern Alberta over three years. Nearly all minnows were co-infected, and the larval trematodes Ornithodiplostomum ptychocheilus and Ornithodiplostomum sp. co-occurred more frequently than expected by chance. I exposed minnows to cercariae of these species to evaluate the effects of intensity dependence and co-infection on parasite development. While negative intensity-dependent growth occurred only for O. ptychocheilus, both species were significantly smaller post-encystment in co-infections than in mono-infections. Thus, Ornithodiplostomum spp. development is influenced by conspecifics and heterospecifics. Taken together, my results suggest that naturally co-occurring parasites in spatially segregated infection sites can influence one another’s growth within their shared intermediate host, with possible ecological and evolutionary consequences.
en_US
ecology
parasitology
co-infection
parasitism
host-parasite interactions
trematoda
biodiversity
multiparasitism
multi-species infection
fish parasites
Fathead minnow--Parasites--Research
Fishes--Parasites
Parasites--Behavior--Research
Parasites--Ecology--Research
Host-parasite relationships
Trematoda--Research
Ecology
Parasitology
Parasitism
Biodiversity
Dissertations, Academic
Patterns of multiparasitism and consequences of co-infection in fathead minnows (Pimephales promelas)
Thesis
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URL
http://localhost:4000/bitstreams/bf15b7a8-27ea-46d0-9fdd-b15288c2846c/download
File
MD5
55b52c8f4d248234ac030c711dcb9a23
2999246
application/pdf
HIRTLE_SARAH_MSC_2021.pdf
URL
http://localhost:4000/bitstreams/a405c786-4c0d-4471-a457-cf280c9664f8/download
File
MD5
8b0761d817c1b38ac71069ee4091b16f
204503
text/plain
HIRTLE_SARAH_MSC_2021.pdf.txt