Densities and energetics of two streamliving larval populations of Sericostoma personatum (Trichoptera)
1980; Wiley; Volume: 3; Issue: 2 Linguagem: Inglês
10.1111/j.1600-0587.1980.tb00709.x
ISSN1600-0587
Autores Tópico(s)Aquatic Invertebrate Ecology and Behavior
ResumoTwo populations of Sericostoma personatum Spence were studied during one year in two first order woodland streams, varying in water flow and temperature regime. The life cycles look two and three years, respectively. Numbers in drift varied with water flow, and daily elimination rates of about 1% due to catastrophic drift were found in one of the streams. Differences in elimination rates between the two populations are discussed in relation to predation, catastrophic drift, and quantity of food present during the year. The production was about 0.9 g AFDW m ‐2 yr ‐1 in both streams, 20–22% of which was production of cases. P/B ratios were 2.4 and 3.8, and reflect differences in life cycle. Total potential leaf consumption was estimated to about 50 g AFDW m ‐2 yr ‐1 in both streams, which makes up about 10% of yearly leaf input. The seasonal pattern of the consumption is discussed in relation to biomass, temperature and leaf input. There was little agreement between the patterns of leaf input and leaf consumption.
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