Artigo
Retention of particulate organic matter in a tropical headstream
Fecha
2002-08-01Registro en:
Hydrobiologia. Dordrecht: Springer, v. 482, n. 1-3, p. 161-166, 2002.
0018-8158
10.1023/A:1021220600302
WOS:000179387500015
3227572672470260
Autor
Universidade Estadual Paulista (Unesp)
Resumen
Retention of particulate organic matter was investigated over a range of water discharges in pool and riffle zones of a tropical stream (Itauna Stream, São Paulo, Brazil). A closed-system leaf release and capture method was used to quantify leaf retention in a 50-m reach of the stream. Instantaneous retention rates (k) were calculated by a negative exponentialmodel and specific retention rates (ke) computed for each 1m interval. The mean k was 0.0161 +/- 0.0101 (S.E.) and ranged from 0.005 to 0.036 during the study period. This suggests a low retention of particulate matter. The evidence provided by this study shows that there was a relationship between retention and discharge. At low discharges, greater percentages of leaves were retained in a 3-h period while high discharges resulted in low retention percentages within the studied reach. In the Itauna Stream, no significant difference (p < 0.05) was found between the ke values of pool and riffle zones.