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Helminthol."],"published-print":{"date-parts":[[2026]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    This study investigated the population dynamics and reproductive biology of the acanthocephalan\n                    <jats:italic>Octospiniferoides incognita<\/jats:italic>\n                    in the intestine of the herbivorous fish\n                    <jats:italic>Rhytiodus microlepis<\/jats:italic>\n                    throughout the seasonal water level fluctuations of a floodplain lake in Amazonas State, Brazil. Between July 2022 and November 2023, hosts were sampled during the rising water, high water, receding water, and low water phases. The results show that the water level fluctuations significantly influence infection levels. Prevalence was 73% during rising water, reached 100% during high water, and remained high during receding water (89%), whereas no parasites were recorded during low water. Abundance and mean intensity were higher during high water and receding water. The population of\n                    <jats:italic>O. incognita<\/jats:italic>\n                    showed sexual dimorphism, with females attaining larger body sizes than males, and both sexes occurring preferentially in the middle portion of the intestine. Three reproductive morphotypes were recognized for each sex. Copulatory activity began during rising water, whereas the highest egg production was concentrated during high water and early receding water. Size at first sexual maturity (L50) was estimated at 0.12 cm, indicating an early maturation strategy. These findings clearly show that the infection dynamics and reproductive processes of\n                    <jats:italic>O. incognita<\/jats:italic>\n                    are closely synchronized with the flood pulse, which regulates host availability and promotes the success of trophic transmission in the Amazonian floodplain ecosystem.\n                  <\/jats:p>","DOI":"10.1017\/s0022149x26102181","type":"journal-article","created":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T07:04:03Z","timestamp":1789542243000},"source":"Crossref","is-referenced-by-count":0,"title":["Population structure and reproductive traits of\n                    <i>Octospiniferoides incognita<\/i>\n                    (Acanthocephala: Neoechinorhynchidae) in\n                    <i>Rhytiodus microlepis<\/i>\n                    (Characiformes: Anostomidae) across seasonal water level fluctuations in a Neotropical Lake"],"prefix":"10.1017","volume":"100","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9437-3825","authenticated-orcid":false,"given":"L.","family":"Vieira de Matos","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01xe86309","id-type":"ROR","asserted-by":"publisher"}],"name":"Instituto Nacional de Pesquisas da Amaz\u00f4nia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D.M.","family":"Diniz Crispim","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02263ky35","id-type":"ROR","asserted-by":"publisher"}],"name":"Universidade Federal do Amazonas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-7976-863X","authenticated-orcid":false,"given":"R.A.","family":"Caldeira Farias","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02263ky35","id-type":"ROR","asserted-by":"publisher"}],"name":"Universidade Federal do Amazonas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.I.","family":"Braga de Oliveira","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02263ky35","id-type":"ROR","asserted-by":"publisher"}],"name":"Universidade Federal do Amazonas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.C.","family":"de Oliveira Malta","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01xe86309","id-type":"ROR","asserted-by":"publisher"}],"name":"Instituto Nacional de Pesquisas da Amaz\u00f4nia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2026,9,16]]},"reference":[{"key":"S0022149X26102181_r29","doi-asserted-by":"publisher","DOI":"10.1111\/ahe.12733"},{"key":"S0022149X26102181_r7","doi-asserted-by":"publisher","DOI":"10.2307\/3284227"},{"key":"S0022149X26102181_r10","doi-asserted-by":"publisher","DOI":"10.4025\/actascibiolsci.v38i1.28592"},{"key":"S0022149X26102181_r30","doi-asserted-by":"publisher","DOI":"10.1111\/jfd.70115"},{"key":"S0022149X26102181_r23","doi-asserted-by":"publisher","DOI":"10.1017\/S0031182000048496"},{"key":"S0022149X26102181_r11","unstructured":"Conselho Nacional de Controle de Experimenta\u00e7\u00e3o Animal (CONCEA) (2018) Diretriz da pr\u00e1tica de eutan\u00e1sia em animais inclu\u00eddos em atividades de ensino ou de pesquisa cient\u00edfica. 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