| physiological (antioxidant) responses of estuarine fishes to variability in dissolved oxygen. | cycles of dissolved oxygen (do) in estuaries can range from anoxia to various levels of supersaturation (200-300%) over short time periods. aerobic metabolism causes formation of damaging reactive oxygen species (ros), a process exacerbated by high or low do. fish can generate physiological defenses (e.g. antioxidant enzymes) against ros, however, there are little data tying this to environmental conditions. we investigated physiological defenses generated by estuarine fishes in response to high ... | 2001 | 11701386 |
| temporal changes in the prevalence of parasites in two oregon estuary-dwelling fishes. | the parasite faunas of juvenile english sole (parophrys vetulus) in 1971-1972 and staghorn sculpin (leptocottus armatus) in 1971 from yaquina bay, oregon, were compared with faunas found in the same estuary in 1997-2000 (english sole) and 1999-2000 (staghorn sculpin). the 7 most commonly occurring parasites in 1971 were compared with the same species observed during the same month and sampling sites in 1997-2000. multivariate community analysis of juvenile english sole parasites supported the su ... | 2004 | 15270100 |
| haematozoa of fishes in humboldt bay, california. | five hundred seven fish representing 45 species from humboldt bay, california (usa) were examined for blood parasites. four fish (less than 1%) from two species were infected. haemogregarina leptocotti sp. n. is described from one of 33 staghorn sculpin (leptocottus armatus). haemogregarina roelofsi sp. n. is described from three of 15 black rockfish (sebastes melanops). gametocytes of h. leptocotti sp. n. averaged 6.1 x 2.1 microns with a 2.7 x 1.7 microns oval nucleus; those of h. roelofsi sp. ... | 1991 | 1758039 |
| dietary mercury exposure to endangered california clapper rails in san francisco bay. | california clapper rails (rallus longirostris obsoletus) are an endangered waterbird that forage in tidal-marsh habitats that pose risks from mercury exposure. we analyzed total mercury (hg) in six macro-invertebrate and one fish species representing clapper rail diets from four tidal-marshes in san francisco bay, california. mercury concentrations among individual taxa ranged from lowest at colma creek (mean range: 0.09-0.2 μg/g dw) to highest at cogswell (0.2-0.7), laumeister (0.2-0.9) and arr ... | 2014 | 25066452 |
| prey fish returned to forster's tern colonies suggest spatial and temporal differences in fish composition and availability. | predators sample the available prey community when foraging; thus, changes in the environment may be reflected by changes in predator diet and foraging preferences. we examined forster's tern (sterna forsteri) prey species over an 11-year period by sampling approximately 10,000 prey fish returned to 17 breeding colonies in south san francisco bay, california. we compared the species composition among repeatedly-sampled colonies (≥ 4 years), using both relative species abundance and the compositi ... | 2018 | 29543811 |
| trace metals in fish and invertebrates of three california coastal wetlands. | metal concentrations were measured in selected fish and invertebrate species from mugu lagoon, malibu lagoon and ballona wetlands in southern california in order to assess the extent of metal contamination in these three wetlands. ranges of element concentrations (in microgram/g) found in biota were: zn 12-650; cu 1.9-440; ni < 1-37; cr < 1-55; pb < 0.5-6.8; as < 1-8.5; se < 1-3.8; cd < 0.2-0.90; and ag < 0.3-5.9. relative to previous studies of california biota, the highest metal concentrations ... | 2001 | 11381877 |