Premium
NEOMYSIS AWATSCHENSIS IN THE SACRAMENTO‐SAN JOAQUIN RIVER ESTUARY
Author(s) -
Heubach William
Publication year - 1969
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1969.14.4.0533
Subject(s) - estuary , bay , san joaquin , oceanography , environmental science , population , baroclinity , spring (device) , abundance (ecology) , hydrology (agriculture) , fishery , geology , biology , mechanical engineering , demography , geotechnical engineering , sociology , soil science , engineering
The opossum shrimp Neomysis awatschensis was collected systematically from Suisun Bay and the Sacramento and San Joaquin Rivers from March 1965 to Scptember 1966. Population densities were highest in summer from freshwater downstream to 4.0‰ chlorinity. Reproduction was greatest in spring and summer from the lowermost freshwater stations to 2.0‰ Cl and was the principal factor affecting seasonal and geographical abundance. Mysid densities were lowest where chlorinity was greater than 10.0‰, little or no flow reversal occurred during floodtide, and light intensity in the water exceeded 10 −5 lux. Water temperatures over 22C in combination with less than 8 ppm dissolved oxygen appear unfavorable to N. awatschensis. Tide and water velocity affected vertical distribution while light influenced both lateral and vertical distribution.