. Bulletin. Science. 96 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES â SM Bay â¡ PV Shelf wSan Diego Winter Spring Summer SEASON Fall Fig. 7. Seasonal prevalence of Phrixocephalus cincinnatus collected from Santa Monica Bay, Palos Verdes shelf (Los Angeles), and Point Loma (San Diego), California. tion of sanddabs from Santa Monica Bay was highest during the summer months (47 infected fish out of 2211), lowest in the fall (10 infected fish out of 1660), and increased slightly in the winter (32 infected fish out of 3572), and spring (37 infected fish out of 3458). Off Palos Verdes, infection
. Bulletin. Science. 96 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES â SM Bay â¡ PV Shelf wSan Diego Winter Spring Summer SEASON Fall Fig. 7. Seasonal prevalence of Phrixocephalus cincinnatus collected from Santa Monica Bay, Palos Verdes shelf (Los Angeles), and Point Loma (San Diego), California. tion of sanddabs from Santa Monica Bay was highest during the summer months (47 infected fish out of 2211), lowest in the fall (10 infected fish out of 1660), and increased slightly in the winter (32 infected fish out of 3572), and spring (37 infected fish out of 3458). Off Palos Verdes, infection was highest in the spring (108 infected fish out of 4221 fish) and winter (91 infected fish out of 3716 fish), dropped in the summer (109 infected fish out of 5630), and was lowest in the fall (81 infected fish out of 6957). Off Point Loma, the highest prevalence occurred in the winter (94 infected fish out of 6512) and spring (73 infected fish out of 5921), declined in the summer (31 infected fish out of 5780), and was lowest in the fall (28 infected fish out of 7386). In addition, the seasonal patterns of infec- tion varied from year to year. Seasonal prevalence of P. cincinnatus from Palos Verdes (Fig. 8) and San Diego (Fig. 9) varied greatly between different years of the study. To determine if effluent released from sewage treatment plants affected infec- tion of sanddabs with the parasite, prevalence was calculated for at least six trawl sites situated at various distances from the effluent discharge pipeline in all three localities. The relative prevalence of P. cincinnatus along the 60 m isobath in Santa Monica Bay varied from north to south and with distance from the outfall (Fig. 10). Stations Z2 and C6, which are located closest to the pipeline, exhibited the highest levels of infection ( and , respectively), whereas CI. â Winter â¡ Spring HSummer â¡ Fall I IlilliMl 79 80 81 82 83 84 85 86 87 88 YEAR 90 91 92 93 94 95 Fig. 8. Seasonal prevalence of
Size: 1233px × 2026px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectscience
