{"title":"明尼苏达州西北部永久池塘中黑桫椤的生命周期和繁殖","authors":"D. L. Peterson","doi":"10.2307/1467147","DOIUrl":null,"url":null,"abstract":"The bait leech, Nephelopsis obscura, followed a 24-month life cycle in two natural ponds of northwestern Minnesota, Priem's Pond and Early's Pond. Clitellum development required an approximate minimum weight of 1.20 g and mature leeches died shortly after depositing cocoons on aquatic vegetation at midsummer. The onset of maturity was correlated to rising water temperature (r=0.98) and lengthening photoperiod (r=0.93). Seasonal depth movement of leeches was obseved in Priem's Pond and was attributed to oxygen depletion at lower depths during midsummer stagnation.","PeriodicalId":154110,"journal":{"name":"Freshwater Invertebrate Biology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1983-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"23","resultStr":"{\"title\":\"Life Cycle and Reproduction of Nephelopsis obscura Verrill (Hirudinea:Erpobdellidae) in Permanent Ponds of Northwestern Minnestoa\",\"authors\":\"D. L. Peterson\",\"doi\":\"10.2307/1467147\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The bait leech, Nephelopsis obscura, followed a 24-month life cycle in two natural ponds of northwestern Minnesota, Priem's Pond and Early's Pond. Clitellum development required an approximate minimum weight of 1.20 g and mature leeches died shortly after depositing cocoons on aquatic vegetation at midsummer. The onset of maturity was correlated to rising water temperature (r=0.98) and lengthening photoperiod (r=0.93). Seasonal depth movement of leeches was obseved in Priem's Pond and was attributed to oxygen depletion at lower depths during midsummer stagnation.\",\"PeriodicalId\":154110,\"journal\":{\"name\":\"Freshwater Invertebrate Biology\",\"volume\":\"2 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1983-11-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"23\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Freshwater Invertebrate Biology\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.2307/1467147\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Freshwater Invertebrate Biology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2307/1467147","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Life Cycle and Reproduction of Nephelopsis obscura Verrill (Hirudinea:Erpobdellidae) in Permanent Ponds of Northwestern Minnestoa
The bait leech, Nephelopsis obscura, followed a 24-month life cycle in two natural ponds of northwestern Minnesota, Priem's Pond and Early's Pond. Clitellum development required an approximate minimum weight of 1.20 g and mature leeches died shortly after depositing cocoons on aquatic vegetation at midsummer. The onset of maturity was correlated to rising water temperature (r=0.98) and lengthening photoperiod (r=0.93). Seasonal depth movement of leeches was obseved in Priem's Pond and was attributed to oxygen depletion at lower depths during midsummer stagnation.
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