Potential solar radiation at H.J. Andrews Experimental Forest, Oregon

EXTRACT (SEE PDF FOR FULL ABSTRACT): Potential (clear-sky) radiation receipt is modeled for the slopes of the H.J. Andrews Experimental Forest Long-Term Ecological Research site in the foothills of the southern Cascade mountains of central Oregon. The modeling method developed by Williams is selected and applied to the forest area for the times of the solstices and equinox as well as mid-month times in January, February, April, and May in order to completely characterize the seasonal change of potential radiation at the location. ... It seems that Lookout Creek approximately divides the Andrews Forest into an area of relatively high potential radiation to the north of the creek and relatively lower potential radiation values to the south of the creek. Potential radiation values seem to be associated with the Andrews GIS data layers of debris flows and predominant tree species zones.

Contribution of zooplankton to the fishery potential of some environments

Difference in zooplankton production in estuarine, coastal and oceanic realms of the Indian Ocean has been correlated to the fishery potential of the concerned area. In the estuarine habitat the estimated rate of secondary production can not sustain a fishery of the present magnitude. Direct correlation between fish landing and zooplankton is observed in the coastal waters. Compared to coastal waters zooplankton standing stock is low in the open ocean and this low production is compensated by a wider area. The estimated fishery potential of the ocean is much more than what is being exploited.

Biological productivity and fishery potential in the coastal waters off Bombay

Fishery potential of the nearshore waters of Bombay is estimated from the observed values of biological productivity at different trophic levels. The rate of primary and secondary production is relatively higher in the polluted coastal waters of Versova, Mahim and Thana. Observed mean benthic standing stock in the polluted creek waters is far less than the relatively unpolluted coastal regions off Bombay. Results suggest that the higher productivity at the lower trophic levels due to pollution, may not end up with high tertiary production. Therefore, such polluted regions are to be classified as special ecosystems where the transfer coefficient may be far less than the assumed 10% conversion factor.

Fishery potential of the Thana-Bassein creek system

Quantitative variation in fish catch at Thana Creek was found 2-93.5 kg/h (av. 24.8 kg/h). The catch rate at Bassein Creek fluctuated between 1 and 34 kg/h (av. 8.2 kg/h). Seasonal effect on the fishery showed maximum catch for premonsoon and monsoon periods respectively for Thana and Bassein Creeks. The catch composition showed dominance of catfish and sciaenids at Thana Creek while engraulids predominated the collections from Bassein Creek. The overall fishery potential showed that yield from Thana Creek was three times more than the Bassein Creek. The importance of this baseline data for future monitoring and ecological assessment of the creek system is discussed.

Rice-fish culture: status and potential for increased production in the southwestern states of India

The scope of increasing production through rice-fish integration, suitable for coastal districts of Kerala, Karnataka, Goa and Maharashtra, is reviewed. The method of adopting the lowlying freshwater rice fields to raise 2 rice crops along with 4-species fish culture, followed by a third non-cereal summer crop in a year, is discussed. A calendar of operation and economics of the system are presented.