| 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 |
| dominance of mycoplasma in the guts of the long-jawed mudsucker, gillichthys mirabilis, from five california salt marshes. | we analysed the gut microflora of the long-jawed mudsucker, gillichthys mirabilis by polymerase chain reaction/denaturing gradient gel electrophoresis and cloning and sequencing 16s rrna gene amplicons. fish were collected at five sites in northern and southern california, usa. the gut microflora assemblages of all g. mirabilis were similar, very simple and dominated by one or more mycoplasma ribotypes. hindguts were dominated by mycoplasmas that were most similar to a ribotype retrieved from at ... | 2007 | 17803786 |
| topographic heterogeneity influences fish use of an experimentally restored tidal marsh. | ecological theory predicts that incorporating habitat heterogeneity into restoration sites should enhance diversity and key functions, yet research is limited on how topographic heterogeneity affects higher trophic levels. our large (8-ha) southern california restoration experiment tested effects of tidal creek networks and pools on trophic structure of salt marsh habitat and high-tide use by two regionally dominant fish species, california killifish (fundulus parvipinnis) and longjaw mudsucker ... | 2008 | 18488610 |
| sediment quality assessment in tidal salt marshes in northern california, usa: an evaluation of multiple lines of evidence approach. | the objective of this study was to evaluate the efficacy of integrating a traditional sediment quality triad approach with selected sublethal chronic indicators in resident species in assessing sediment quality in four salt marshes in northern california, usa. these included the highly contaminated (stege marsh) and relatively clean (china camp) marshes in san francisco bay and two reference marshes in tomales bay. toxicity potential of contaminants and benthic macroinvertebrate survey showed si ... | 2013 | 23542672 |
| using gene expression to assess the status of fish from anthropogenically influenced estuarine wetlands. | the diverse mixture of contaminants frequently present in estuaries complicates their assessment by routine chemical or biological analyses. we investigated the use of gene expression to assess contaminant exposure and the condition of southern california estuarine fish. liver gene expression, plasma estradiol concentrations, and gonad histopathology were used to study biological condition in longjaw mudsuckers (gillichthys mirabilis). metals, legacy organochlorine pesticides, pcbs, and contamin ... | 2012 | 21793489 |
| growth of estuarine fish is associated with the combined concentration of sediment contaminants and shows no adaptation or acclimation to past conditions. | we tested whether the growth rates of small benthic fish (gillichthys mirabilis) in three southern california estuaries corresponded with the local concentrations of contaminants. fish originating from each estuary were transplanted to cages in each estuary in two reciprocal transplant experiments. the growth rates of caged fish, and the size-distribution of natural populations, showed the same pattern of difference among estuaries. twelve metals and organic contaminants occurred in bulk sedimen ... | 2003 | 12738223 |
| tidal salt marsh sediment in california, usa: part 3. current and historic toxicity potential of contaminants and their bioaccumulation. | to assess potential health risks to benthic organisms from exposure to toxic contaminants, sediment chemistry data from five salt marshes along the coast of california were compared with threshold effects levels (tels) and probable effects levels (pels). as an integrated estimate of toxicity potential of multiple contaminants, mean pel quotients (mpelqs) were used to categorize sampling stations into three groups: high (>0.5), medium (0.1-0.5) and low (<0.1). in all sediments from stege marsh lo ... | 2008 | 18316112 |
| 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 |