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Resumen Entre los insectos acuáticos, los plecópteros desempeñan un rol destacado en la descomposición y la recirculación de nutrientes y contribuyen, en la red trófica, como alimento de otros insectos y vertebrados. El propósito de este estudio fue conocer la variación de la biomasa y la dieta del género Anacroneuria durante cuatro meses en la parte media del río Gaira. Se recolectaron en total 1.284 individuos y se organizaron en cinco clases de tallas (0,1−0,5, 0,6−1,0, 1,1−1,5, 1,6−2,0 y 2,1−2,5 cm). Se encontraron diferencias en las clases de las tallas (H’=100,3; p 2 cm size class was not found during samplings 5 and 6. Abundance was significantly different among microhabitats; with the highest abundance observed in leaves (763 organisms) and the lowest in gravel stones (86 organisms). The cumulative biomass was 441.6 PSLC mg/m2, where the intermediate sizes (0.6−2,0 cm) were the largest contributors to the biomass of the genus (average AFDW: 215.53 ± 4.67 mg/m2), while the largest size (2.1-2.5 cm) had the lowest contribution (average AFDW: 48.90 ± 4.62 mg/m2). The was no significant correlation between gut contents and body size. The most common fragments in gut contents were animals and detritus. Biomass available to the Anacroneuria genus had provides a high energy content that was negatively affected by rainfall and discharges.

The objective of this research was to characterize the production of fine litter provided by five abundant species on a stretch of the middle basin of the Gaira river. The study was carried out for six months, with bimonthly collections in 87 fall traps distributed systematically every 10 m for a total of 10 transects. The collected material was separated by fractions and it was determined and their contribution in terms of dry mass, resulting in a yearly production of 3764 kg ha- 1, that the extrapolated a year represented 7529 kg ha-1, intermediate value than those in other studies in tropical rainforests. The production of fine litter was dominated by the leaf fraction (65% ), followed by the woody material (17.7% ), reproductive material (9.4 %) and other debris (7.6% ). The highest production of leaf litter was recorded for Nectandra cf. turbacensis (152.27 kg ha-1) and the lower production was for the Pouteria arguacoensium (9.66 kg ha-1). The Nectandra cf. turbacensis and the Zygia longifolia species presented the major leaf litter contributions, which were categorized as potential species for inclusion in activities for the restoration of coastal areas by water currents. El objetivo de esta investigación fue caracterizar la producción de hojarasca fina aportada por cinco especies abundantes en un tramo de la cuenca media del rio Gaira. El estudio se realizó durante seis meses, con recolecciones bimensuales en 87 trampas de caída distribuidas sistemáticamente cada 10 m en un total de 10 transectos. El material colectado se separó por fracciones y se determinó su aporte en términos de masa seca, dando como resultado una producción semestral de 3764 kg ha-1, que extrapolada a un ano represento 7529 kg ha-1, valor intermedio a los registrados en otros estudios realizados en bosques húmedos tropicales. La producción de hojarasca fina estuvo dominada por la fracción foliar (65%), seguida del material lenoso (17,7%), material reproductivo (9,4%) y otros restos (7,6%). La mayor producción de hojarasca foliar se registró para Nectandra cf. turbacensis (152,27 kgha-1)y la menor producción la obtuvo Pouteria arguacoensium (9,66 kgha-1). Las especies Nectandra cf. turbacensis y Zygia longifolia presentaron los mayores aportes de hojarasca foliar, tipificándolas como especies potenciales para su inclusión en actividades de restauración de zonas riberenas de corrientes de agua. O objetivo deste estudo foi caracterizar a producao de serapilheira fina de cinco especies abundantes fornecidas num tramo da bacia media do rio Gaira. O estudo foi realizado ao longo de seis meses, com coletas bimestrais em 87 armadilhas de queda a cada 10 m distribuidas sistematicamente em um total de 10 transeptos. O material coletado foi separado por fracoes e sua contribuicao foi determinada em termos de massa seca, resultando em uma producao semestral de 3764 kg ha-1, extrapolados para um ano foi responsavel por 7529 kg ha-1, valor dentro da media dos registrados em outros estudos em florestas tropicais. Producao da serapilheira fina foi dominada pela fracao foliar (65%), seguido por material lenhoso (17,7%), material reprodutivo (9,4%) e outros residuos (7,6%). A maior producao de serapilheira foliar foi para Nectandra cf. turbacensis (152,27 kgha-1) e a menor obtida em Pouteriaarguacoensium (9,66 kg ha-1). As especies Nectandra cf. Turbacensis e Zygialongifolia tiveram a maior contribuicao da serapilheira, tipificando-as como especies potenciais para inclusao em atividades de restauracao em locais ribeirinhos de corregos de agua