Effects of the availability of energetic and protective resources on the abundance of daphniids (Cladocera, Daphniidae) in Chilean Patagonian lakes (39°-51°S)
- URI:
- https://hdl.handle.net/10925/816
- Carrera:
- Ingeniería en Acuicultura - Ingeniería en Recursos Naturales Renovables
- Facultad:
- Facultad de Recursos Naturales
- Fecha de publicación:
- 2012-03-01
- Datos de publicación:
- Crustaceana, Vol.79, N°1, 23-32, 2006
- Temas:
- Crustáceos - Recursos enegéticos - Cladocera - Daphniidae
- Medio Ambiente [372]
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- Resumen:
- The lacustrine zooplankton of Chile is characterized by a low abundance of daphniid cladocerans and a predominance of calanoid copepods, thus making up a zooplankton community quite different from that described for North American lakes. To explain this pattern, this study investigates the role of the oligotrophy, and the resulting high transparency of a considerable number of locations. Due to low levels of dissolved organic carbon, viz., Daphniidae are exposed to ultraviolet radiation. Chilean lakes located between 39° and 51°S were studied, and maximum depth, mixing depth, trophic status, and dissolved organic carbon concentrations were measured and considered. The results obtained revealed that daphniids were abundant in oligo-mesotrophic lakes with shallow mixing depth. Thus, daphniid abundance is directly associated with chlorophyll-a concentration as an energetic resource, but also with sufficient depth, because this last condition provides protection against the penetration of ultraviolet radiation.