{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,21]],"date-time":"2026-04-21T20:20:58Z","timestamp":1776802858831,"version":"3.51.2"},"reference-count":34,"publisher":"Cambridge University Press (CUP)","issue":"6","license":[{"start":{"date-parts":[[2017,1,11]],"date-time":"2017-01-11T00:00:00Z","timestamp":1484092800000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":["www.cambridge.org"],"crossmark-restriction":true},"short-container-title":["Parasitology"],"published-print":{"date-parts":[[2017,5]]},"abstract":"<jats:title>SUMMARY<\/jats:title><jats:p>In this investigation, the host\u2013parasite relationship of ninespine stickleback fish<jats:italic>Pungitius pungitius<\/jats:italic>and the cestode parasite<jats:italic>Schistocephalus pungitii<\/jats:italic>was studied using samples from Dog Bone Lake, Kenai Peninsula, Alaska, to test the hypothesis that<jats:italic>S. pungitii<\/jats:italic>is a castrator of ninespine stickleback. Infected, adult females of all sizes (ages) were capable of producing clutches of eggs.<jats:italic>S. pungitii<\/jats:italic>had a negative effect on the ability of host females to produce a clutch, which was related to increasing parasite:host mass ratio (parasite index, PI). Among infected females with egg clutches, both clutch size and egg size were reduced; and the reduction increased with greater PI. The results of this study are consistent with the hypothesis that<jats:italic>S. pungitii<\/jats:italic>causes host sterility as a result of simple nutrient theft and is not a true castrator as hypothesized in earlier reports. The degree of parasite-induced sterility appears to vary among populations of the ninespine stickleback, perhaps reflecting differences in resource availability. Populations of ninespine stickleback appear to show a greater reduction in host reproductive capacity with PI than populations of the threespine stickleback infected by<jats:italic>Schistocephalus solidus<\/jats:italic>, possibly owing, in part, to the length-adjusted somatic mass of the threespine stickleback being greater.<\/jats:p>","DOI":"10.1017\/s0031182016002596","type":"journal-article","created":{"date-parts":[[2017,1,11]],"date-time":"2017-01-11T06:41:12Z","timestamp":1484116872000},"page":"834-840","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":6,"title":["The cestode parasite<i>Schistocephalus pungitii<\/i>: castrator or nutrient thief of ninespine stickleback fish?"],"prefix":"10.1017","volume":"144","author":[{"given":"DAVID 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