Artículo
Life cycle, production and habitat selection of Notoperla fasciata and N. magnaspina (Plecoptera: Gripopterygidae) in a headwater Patagonian stream
Fecha de publicación:
02/2011
Editorial:
E Schweizerbartsche Verlags
Revista:
Fundamental and Applied Limnology
ISSN:
1863-9135
e-ISSN:
2363-7110
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We examined the life history, annual production, diet, habitat preferences and competition of two species of stoneflies Notoperla fasciata and N. magnaspina in a Patagonian mountain headwater stream. Benthic samples and adult collections were taken monthly from July 2004 to June 2005. A habitat selection study was performed concurrently during high and low water periods in five substrate types. Although both species showed long life cycles (N. fasciata: 20 months and N. magnaspina: 3 years) their life histories and temporal dynamics were different. Growth was rapid during summer and early autumn as a result of warmer temperatures but N. magnaspina had a shorter emergence period (November to January) than N. fasciata (January to April). N. fasciata was the dominant Notoperla species with a mean annual density 6 times higher and secondary production 4.5 higher than that of N. magnaspina. While boulders in riffles and pools, and leaf-pack habitats supported significantly more individuals of N. magnaspina in the low water period (ANOVA, p 0.26). N. fasciata dominated in the high water period and N. magnaspina during the low water period. Analysis of gut contents revealed that both species were herbivorous grazers, and consumed the same food types. The interspecific overlap in density, biomass and annual production among habitat types was high in the low water period (PS > 0.5). However, N. fasciata were smaller than N. magnaspina. The existence of different life history strategies and the temporal shift of main generations and density peaks were critical to allow species coexistence and to reduce competition.
Palabras clave:
STONEFLY
,
SECONDARY PRODUCTION
,
SEASONAL PATTERN
,
COMPETITION
,
SEMIVOLTINE
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Epele, Luis Beltran; Miserendino, Maria Laura; Life cycle, production and habitat selection of Notoperla fasciata and N. magnaspina (Plecoptera: Gripopterygidae) in a headwater Patagonian stream; E Schweizerbartsche Verlags; Fundamental and Applied Limnology; 178; 3; 2-2011; 219-229
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