{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T18:28:53Z","timestamp":1790706533459,"version":"4.1.0"},"reference-count":39,"publisher":"Cambridge University Press (CUP)","issue":"12","license":[{"start":{"date-parts":[[2007,7,13]],"date-time":"2007-07-13T00:00:00Z","timestamp":1184284800000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Parasitology"],"published-print":{"date-parts":[[2007,11]]},"abstract":"<jats:title>SUMMARY<\/jats:title><jats:p>We tested the hypothesis that host specificity in ectoparasites does not depend exclusively on the features of the host but also on surrounding habitats, using 2 fish ectoparasites,<jats:italic>Argulus coregoni<\/jats:italic>and<jats:italic>A. foliaceus<\/jats:italic>(Crustacea: Branchiura), occurring sympatrically in Finnish lakes. Although these parasites are considered to be of low specificity, we found that the larger of the 2 species,<jats:italic>A. coregoni<\/jats:italic>developed a pronounced preference for salmonid hosts at the beginning of maturation (defined by the presence of copulating specimens).<jats:italic>Argulus foliaceus<\/jats:italic>infects a much wider range of fish hosts. We showed that specialization of<jats:italic>A. coregoni<\/jats:italic>on salmonids does not necessarily result from incompatibility with other fishes, but could instead reflect higher sensitivity of oxygen depletion compared with<jats:italic>A. foliaceus<\/jats:italic>. Adult<jats:italic>A. coregoni<\/jats:italic>may meet these demands by attaching to salmonids, the typical inhabitants of well-aerated waters. Young parasites of both species showed little host specificity and attached mainly to fishes with higher body reflectivity. In host choice experiments,<jats:italic>A. coregoni<\/jats:italic>of 4\u20135\u00a0mm length preferred salmonids (rainbow trout) to cyprinids (roach) irrespective of the type of fish host, on which it had been previously grown in the laboratory. We suggest that such an innate ontogenetic shift in host preference maintains the major part of the parasite population on its principal host, ensuring successful reproduction within suitable habitats.<\/jats:p>","DOI":"10.1017\/s0031182007003125","type":"journal-article","created":{"date-parts":[[2007,7,13]],"date-time":"2007-07-13T09:18:17Z","timestamp":1184318297000},"page":"1767-1774","source":"Crossref","is-referenced-by-count":17,"title":["Host specificity of<i>Argulus coregoni<\/i>(Crustacea: Branchiura) increases at maturation"],"prefix":"10.1017","volume":"134","author":[{"given":"V.\u00a0N.","family":"MIKHEEV","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.\u00a0F.","family":"PASTERNAK","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"E.\u00a0T.","family":"VALTONEN","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2007,7,13]]},"reference":[{"key":"S0031182007003125_ref038","volume-title":"Limnology","author":"Wetzel","year":"1983"},{"key":"S0031182007003125_ref037","doi-asserted-by":"publisher","DOI":"10.4319\/lo.2001.46.5.1034"},{"key":"S0031182007003125_ref016","volume-title":"Diseases of Fishes: Book 1. 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