Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/5138
Título: Leaf litter decomposition in western iberian forested wetlands: lentic versus lotic response
Outros títulos: Decomposicion de la hojarasca en humedales boscosos de la zona occidental Iberica: respuesta lenitica frente a lotica
Autor: Sampaio, Ana
Rodriguez-Gonzalez, Patricia
Varandas, Simone
Cortes, Rui Manuel
Ferreira, Maria Teresa
Palavras-chave: leaf litter
forested wetlands
decomposition
lotic
lentic
microorganisms
macroinvertebrates
Data: 2008
Editora: Asociacion Iberica de Limnologia
Citação: "Limnetica". ISSN 0213-8409. 27 (1) (2008) 93-106
Resumo: Leaf litter breakdown is frequently used to measure both structural and functional integrity in aquatic ecosystems. Forested wetlands are interface systems that received little attention, especially in the Iberian Peninsula. The present study compares the decomposition of alder and willow in two biotopes (lentic and lotic) located in two different sites (Caxarias and Alpiarc¸a). Litterbags were used to compare decomposition among the different treatments. Throughout decay, dry weight loss, nitrogen and phosphorus content, microbial community physiological profiles, microbial and macro-invertebrate colonization were measured at days 2, 4, 8, 16, 32 and 64. Decomposition rates ranged from intermediate to rapid for alder (0.006 day−1 to 0.0338 day−1) and slow to rapid for willow (0.0024 day−1 to 0.0272 day−1), depending on site and biotopes type. The combined effects biotope × time was significant for heterotrophs (P < 0.05), molds (P < 0.05) and yeasts (P < 0.001). The analysis of average well colour development (AWCD), richness (R) and Shannon-Wiener index (H ) based on the oxidation of carbon and nitrogen sources by the microbial community, showed differences between the two biotopes, lotic and lentic, and sites. These differences were also shown by the principal component analysis (PCA). Moreover, the macroinvertebrate communities clearly distinguished between lentic and lotic systems. The invertebrates belonging to Plecoptera, Ephemeroptera and Trichoptera were absent from lentic habitats.
Peer review: yes
URI: http://hdl.handle.net/10400.5/5138
ISSN: 0213-8409
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