Survey expeditions of the diatoms of Puerto Rico and other Caribbean islands were conducted briefly in the late 1800's and early 1900's,. However, until now no intensive study of changes in freshwater diatom community over time has been undertaken. In conjunction with other measures of quality of water in the Rio Mameyes, i.e. pH, conductivity, temperature, nutrients, periphytic diatoms have been collected monthly for two years in an effort to detect the effects of disturbances such as hurricanes and human demands on a river ecosystem.
Additional Project roles:
Site and Location
|Elevation (Drainage area||Riparian vegetation and cover||Channel features||Land use|
|Site A Within USFS research area:||~ 200 m (35 ha)||Closed canopy, native tree species||Tributary channel - steep gradient, boulder lined||Mature forest; Limited public access|
|Site B At bridge crossing Rio Mameyes||~85m (1758 ha)||Open canopy, native and non - native tree species||Main channel - steep gradient, boulder and bedrock lined||Forest Area used for swimming and picnicking|
|Site C Near the municipal water intake||~15 m (3460 ha)||Open canopy, tall grass, native and non-native tree species||Main channel - low gradient, sand and cobble bed||Forested; Mixed suburban land use|
|Site D in golf course||~1 m (3483 ha)||Open canopy, bamboo, some wetland vegetation, golf-course grass||Main channel - low gradient, sand and cobble bed, submerged aquatic vegetation, last non-tidal freshwater reach||Residential, light commercial, and golf course|
|Site E crosses urban area and golf cours||~1 m (419 ha)||Open canopy, partially open woody vegetation and golf course grass||Tributary channel - Low gradient, sand and pebble bed, some submerged aquatic vegetation||Residential, light commercial, and golf course|
The locations are based on locations for the chemistry data that Bill McDowell and Fred collected for years, so the river distances are the same. The codes in the parentheses are the ones I remember from the chemistry dataset.
A = Bisley, Quebrada 3 (Q3)
B = Puente Roto (MPR)
C = the intake in Fortuna (MIN)
D = the main channel just downstream from the little tributary in the Westin Rio Mar golf course (MTC)
E = just upstream of the mouth inside the tributary in the Westin Rio Mar golf course. (MTRIB)