Chlorophyll, primary productivity, and respiration in a lowland Costa Rican stream
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| Autores: | , |
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| Formato: | artículo original |
| Estado: | Versión publicada |
| Fecha de Publicación: | 1992 |
| Descripción: | In situ nutrient enrichrnent bioassays were conducted in open and closed canopy sites of a third order stream draining primary rain forest and abandoned pasture land in northern Costa Rica. Artificial sand+agar substrata spiked with nitrogen, phosphorus, N+P, molybdenum, N+Mo, and a mix of manganese, zinc, and molybdenum were incubated for 15 and 21 days. The colonizing periphyton in the forested streamsites (4 mi chloroph:lll a m"2) showed extreme light limitation when compared with the open, pasture areas (14-45 mg chlorophyll a m- ) after 15 days of colonization. Chlorophyll a concentrations, oxygen production and consumption, and assimilation ratios did not show a significant nutrient addition effect indicating that ambient nutrient concentrations are at saturation levels for periphyton growth. Ten-to-fifteen day old periphyton was autotrophic (P!R>l) on al! trealrnents. Compared with other tropical streams, similar chlofophyll but lower Tates of primary productivity «300 mg 02 m-2 h-l) and respiratíon (70 mg 02 m-2 h-l) occurred in this stream. |
| País: | Portal de Revistas UCR |
| Institución: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| Lenguaje: | Inglés |
| OAI Identifier: | oai:portal.ucr.ac.cr:article/24526 |
| Acceso en línea: | https://revistas.ucr.ac.cr/index.php/rbt/article/view/24526 |