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Relative importance of host-dependent versus physical environmental characteristics affecting the distribution of an ectoparasitic copepod infecting the mouth cavity of stream salmonid
| Title: | Relative importance of host-dependent versus physical environmental characteristics affecting the distribution of an ectoparasitic copepod infecting the mouth cavity of stream salmonid |
| Authors: | Hasegawa, Ryota Browse this author | | Koizumi, Itsuro Browse this author →KAKEN DB |
| Keywords: | ectoparasites | | parasitic copepod | | Salmincola | | stream-drift paradox |
| Issue Date: | Nov-2021 |
| Publisher: | John Wiley & Sons |
| Journal Title: | Ecological Research |
| Volume: | 36 |
| Issue: | 6 |
| Start Page: | 1015 |
| End Page: | 1027 |
| Publisher DOI: | 10.1111/1440-1703.12262 |
| Abstract: | Understanding parasite distributional patterns is fundamental for elucidating host-parasite relationships. The genus Salmincola is an ectoparasitic copepod group specifically infecting freshwater salmonids. Considering their strong association with their hosts, we can predict that the distribution and prevalence (analogs to abundance) of Salmincola reflect host salmonids. An alternative hypothesis is that their distribution will be strongly affected by environmental factors like stream drift because they have a free-living stage with low swimming ability. If this is the case, we predict a longitudinal gradient with higher occurrence or infection levels in downstream areas. To estimate the relative strength among factors affecting infection levels, we investigated the distribution pattern of Salmincola sp. on wild white-spotted charr Salvelinus leucomaenis in a southern Hokkaido river system. Based on data from 19 sites across three seasons, we found that host density and flow velocity affected the prevalence of Salmincola. On the other hand, no longitudinal gradient was observed and the prevalence was extremely low in some fragmented habitats (i.e., above dams and waterfalls). This indicates some compensation mechanisms against unidirectional downstream dispersal. We found that parasite prevalence and intensity were much higher in large migratory (anadromous) fish and, therefore, hypothesize that long-distance upstream migration helps the redistribution and population persistence of parasites in upstream areas. |
| Rights: | This is the peer reviewed version of the following article: Hasegawa, R., Koizumi, I. Relative importance of host-dependent versus physical environmental characteristics affecting the distribution of an ectoparasitic copepod infecting the mouth cavity of stream salmonid. Ecological Research. 2021; 36(6): 1015-1027, which has been published in final form at https://doi.org/10.1111/1440-1703.12262. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/87056 |
| Appears in Collections: | 環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 長谷川 稜太
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