The life history and production of the leech Helobdella stagnalis (Hirudinea:Glossiphonidae) in the River Ely, South Wales
A population of the glossiphonid leech Helobdella stagnalis was studied over a period of 16 months in the organically polluted River Ely, South Wales. There were two generations each year. The overwintering population released young (the spring‐brood) in June. The spring‐brood in turn produced their...
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| Veröffentlicht in: | Freshwater biology 1982-01, Vol.12 (4), p.321-329 |
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| container_title | Freshwater biology |
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| creator | MURPHY, P. M. LEARNER, M.A. |
| description | A population of the glossiphonid leech Helobdella stagnalis was studied over a period of 16 months in the organically polluted River Ely, South Wales. There were two generations each year. The overwintering population released young (the spring‐brood) in June. The spring‐brood in turn produced their own offspring (summer‐brood) in August.
Seasonal patterns of mortality were related to flow, temperature and life‐cycle stage. Individual growth rates were dependent upon both temperature and life‐cycle stage.
Annual population production (P) was 7.56 g wet wt m‐2, mean annual population biomass (B) was 1.43 g wet wt m‐2 and the annual P/B ratio was 5.29. |
| doi_str_mv | 10.1111/j.1365-2427.1982.tb00626.x |
| format | Article |
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Seasonal patterns of mortality were related to flow, temperature and life‐cycle stage. Individual growth rates were dependent upon both temperature and life‐cycle stage.
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Seasonal patterns of mortality were related to flow, temperature and life‐cycle stage. Individual growth rates were dependent upon both temperature and life‐cycle stage.
Annual population production (P) was 7.56 g wet wt m‐2, mean annual population biomass (B) was 1.43 g wet wt m‐2 and the annual P/B ratio was 5.29.</description><subject>Freshwater</subject><subject>Helobdella stagnalis</subject><issn>0046-5070</issn><issn>1365-2427</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1982</creationdate><recordtype>article</recordtype><recordid>eNqVkkFv1DAQhSNEJZbS_2BxQCCRMI5jJ-kBqZTuLlIFUlu0vVneZEK8uPFiJ-0uvx6nqXpt8cWS_b1nz8yLorcUEhrWp01CmeBxmqV5QssiTfo1gEhFsnsRzR6vXkYzgEzEHHJ4Fb32fgMABc_TWfT3qkVidIOk1b63bk9UV5Ots_VQ9dp2xDakHxHEqiVLNHZdozGK-F796pTRnrxfajfUukN1vDDWe71tbadrhR-I7u7FF_oWHTkz-4_k0g59S1bKoH8THTTKeDx62A-jn_Ozq9NlfP5j8e305DyuOJQ0ZmzNAChVyEpseF2um4LRvGEKWF7WBahK1RWGM6hSUVSKZqwQNTaC8ZSllB1G7ybfUNWfAX0vb7SvxiI6tIOXaVkGDJ4DiiILhk-ClHMqSgrPALM8zIQ_DbIiD78cnz6ewMqFVjts5NbpG-X2koIcIyE3cpy7HOcux0jIh0jIXRB_nsR32uD-P5RyvvoytTKeDEJWcPdooNxvKXKWc7n6vpCX2Wr59fp6Ljn7B-rizN4</recordid><startdate>19820101</startdate><enddate>19820101</enddate><creator>MURPHY, P. M.</creator><creator>LEARNER, M.A.</creator><general>Blackwell Publishing Ltd</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QH</scope><scope>F1W</scope><scope>H95</scope><scope>L.G</scope><scope>7SN</scope><scope>C1K</scope><scope>7TB</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope></search><sort><creationdate>19820101</creationdate><title>The life history and production of the leech Helobdella stagnalis (Hirudinea:Glossiphonidae) in the River Ely, South Wales</title><author>MURPHY, P. M. ; LEARNER, M.A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c5091-33b30011ae39ef5d9bf8317f3a0379d80acadce8310c268ca14386def63523213</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1982</creationdate><topic>Freshwater</topic><topic>Helobdella stagnalis</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>MURPHY, P. M.</creatorcontrib><creatorcontrib>LEARNER, M.A.</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Aqualine</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Ecology Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Freshwater biology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>MURPHY, P. M.</au><au>LEARNER, M.A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The life history and production of the leech Helobdella stagnalis (Hirudinea:Glossiphonidae) in the River Ely, South Wales</atitle><jtitle>Freshwater biology</jtitle><date>1982-01-01</date><risdate>1982</risdate><volume>12</volume><issue>4</issue><spage>321</spage><epage>329</epage><pages>321-329</pages><issn>0046-5070</issn><eissn>1365-2427</eissn><abstract>A population of the glossiphonid leech Helobdella stagnalis was studied over a period of 16 months in the organically polluted River Ely, South Wales. There were two generations each year. The overwintering population released young (the spring‐brood) in June. The spring‐brood in turn produced their own offspring (summer‐brood) in August.
Seasonal patterns of mortality were related to flow, temperature and life‐cycle stage. Individual growth rates were dependent upon both temperature and life‐cycle stage.
Annual population production (P) was 7.56 g wet wt m‐2, mean annual population biomass (B) was 1.43 g wet wt m‐2 and the annual P/B ratio was 5.29.</abstract><cop>Oxford, UK</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1111/j.1365-2427.1982.tb00626.x</doi><tpages>9</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0046-5070 |
| ispartof | Freshwater biology, 1982-01, Vol.12 (4), p.321-329 |
| issn | 0046-5070 1365-2427 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_29932101 |
| source | Wiley Online Library Journals Frontfile Complete |
| subjects | Freshwater Helobdella stagnalis |
| title | The life history and production of the leech Helobdella stagnalis (Hirudinea:Glossiphonidae) in the River Ely, South Wales |
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