EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/25/2021 | 8:30 AM - 10:30 AM | MEDITERRANEAN CLIMATE FLOWS AND IN-STREAM FAUNA: MOSQUITOFISH AND INVERTEBRATE ABUNDANCES IN GRAYSON CREEK, CONTRA COSTA CO., CALIFORNIA | Virtual Platform
MEDITERRANEAN CLIMATE FLOWS AND IN-STREAM FAUNA: MOSQUITOFISH AND INVERTEBRATE ABUNDANCES IN GRAYSON CREEK, CONTRA COSTA CO., CALIFORNIA
Gambusia affinis is used worldwide in mosquito control programs. Although designated an invasive species in California, it is currently unknown how well they persist after high winter flows of Mediterranean climates. California mosquito control relies on stocking mosquitofish that have to be restocked intermittently from losses. From November-February 2021, we inventoried habitat characteristics, sampled aquatic and terrestrial habitats for macroinvertebrates, and counted stocked mosquitofish in Grayson Creek, in Northern California, in 3 sampling sites (11 sub-sites). Using sticky traps, we sampled terrestrial insects. Sciaridae, Simuliidae, and Chironomidae dominated the samples and increased in abundance after heavy rains to levels greater than those just before the rainy season. We collected in-stream fauna using drift nets at each site, and abundance increased after flows except for at the furthest downstream location, where macroinvertebrate abundance continuously decreased. Mosquitofish abundance via visual survey counts also decreased during periods of high flow until disappearing altogether. Insect abundance recovered after heavy flows removed the mosquitofish, and Culicidae were rarely present throughout the entire sampling period. Thus, it is unclear if abundance is attributed to the mosquitofish or other ecosystem characteristics.
- Flow regime
- Vertebrates
- Species interactions
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Presenters/Authors
Queenie Li
(), UC Berkeley, quli168@berkeley.edu;
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Patina Mendez
(), University of California, Berkeley, patina.mendez@berkeley.edu;
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