title: Seasonal variation and impact of waste-water lagoons as larval habitat on the population dynamics of Culicoides sonorensis (Diptera:Ceratpogonidae) at two dairy farms in northern California.
abstract: The Sacramento (northern Central) Valley of California (CA) has a hot Mediterranean climate and a diverse ecological landscape that is impacted extensively by human activities, which include the intensive farming of crops and livestock. Waste-water ponds, marshes, and irrigated fields associated with these agricultural activities provide abundant larval habitats for C. sonorensis midges, in addition to those sites that exist in the natural environment. Within this region, C. sonorensis is an important vector of bluetongue (BTV) and related viruses that adversely affect the international trade and movement of livestock, the economics of livestock production, and animal welfare. To characterize the seasonal dynamics of immature and adult C. sonorensis populations, abundance was monitored intensively on two dairy farms in the Sacramento Valley from August 2012- to July 2013. Adults were sampled every two weeks for 52 weeks by trapping (CDC style traps without light and baited with dry-ice) along N-S and E-W transects on each farm. One farm had large operational waste-water lagoons, whereas the lagoon on the other farm was drained and remained dry during the study. Spring emergence and seasonal abundance of adult C. sonorensis on both farms coincided with rising vernal temperature. Paradoxically, the abundance of midges on the farm without a functioning waste-water lagoon was increased as compared to abundance on the farm with a waste-water lagoon system, indicating that this infrastructure may not serve as the sole, or even the primary larval habitat. Adult midges disappeared from both farms from late November until May; however, low numbers of parous female midges were detected in traps set during daylight in the inter-seasonal winter period. This latter finding is especially critical as it provides a potential mechanism for the "overwintering" of BTV in temperate regions such as northern CA. Precise documentation of temporal changes in the annual abundance and dispersal of Culicoides midges is essential for the creation of models to predict BTV infection of livestock and to develop sound abatement strategies.
authors.affiliation: Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California Davis, Davis, California, United States of America.
authors.forename: Christie E
authors.initials: CE
authors.lastname: Mayo
authors.affiliation: Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California Davis, Davis, California, United States of America.
authors.forename: Cameron J
authors.initials: CJ
authors.lastname: Osborne
authors.affiliation: Department of Entomology, University of California Riverside, Riverside, California, United States of America.
authors.forename: Bradley A
authors.initials: BA
authors.lastname: Mullens
authors.affiliation: Department of Entomology, University of California Riverside, Riverside, California, United States of America.
authors.forename: Alec C
authors.initials: AC
authors.lastname: Gerry
authors.affiliation: Department of Health Management, Atlantic Veterinary College, Charlottetown, Prince Edward Island, Canada.
authors.forename: Ian A
authors.initials: IA
authors.lastname: Gardner
authors.affiliation: Center for Vectorborne Diseases, University of California Davis, Davis, California, United States of America.
authors.forename: William K
authors.initials: WK
authors.lastname: Reisen
authors.affiliation: Center for Vectorborne Diseases, University of California Davis, Davis, California, United States of America.
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Barker
authors.affiliation: Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California Davis, Davis, California, United States of America.
authors.forename: N James
authors.initials: NJ
authors.lastname: Maclachlan
mesh_terms: D063147:Animal Distribution; D000818:Animals; D002519:Ceratopogonidae / Q000502:physiology*; D017753:Ecosystem; D005260:Female; D007303:Insect Vectors / Q000502:physiology*; D007814:Larva / Q000502:physiology; D008297:Male; D011157:Population Dynamics; D012621:Seasons; D062065:Wastewater; D053833:Wetlands
chemical_list: D062065:Wastewater