Erratic occurrence of anostracans in a temporary pond: colonization and extinction or adaptation to variations in annual weather?
| Autor: | David B. Donald |
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| Rok vydání: | 1983 |
| Předmět: | |
| Zdroj: | Canadian Journal of Zoology. 61:1492-1498 |
| ISSN: | 1480-3283 0008-4301 |
| DOI: | 10.1139/z83-201 |
| Popis: | Five species of Anostraca (Branchinecta paludosa (O.F.M.), Branchinecta lindahli Packard, Eubranchipus bundyi Forbes, Eubranchipus intricatus Hartland-Rowe, and Eubranchipus ornatus Holmes) inhabited a temporary pond near Calgary, Alberta. During a 14-year study of this pond, occurrence and species composition of anostracans changed almost every year. In most years only one to three species were common or abundant, and the other species were either absent or rare. Four of the five species were dominant in at least 1 year. A review of literature on anostracans and analyses of annual weather patterns at Calgary were carried out in order to determine the cause of these erratic occurrence patterns and changes in species composition. For Eubranchipus bundyi, Branchinecta lindahli, and possibly Eubranchipus intricatus, the cause was probably due to long-term viability of eggs in association with species specific requirements of the embryo for certain quantities of precipitation at critical times of the year. It is suggested that when these precipitation requirements were ideal, hatching was substantial. For two other species, Branchinecta paludosa and Eubranchipus ornatus, erratic occurrence patterns could be explained by either the above or by a colonization–extinction hypothesis. |
| Databáze: | OpenAIRE |
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