Copepod Mesocyclops as biological control agents for dengue was previously proven to be effective and sustainable in the Northern and Central provinces of Vietnam. We aim to study social sustainability of Mesocyclops intervention in south Vietnam. Both quantitative and qualitative approaches were used. An entomological survey was carried out in 100 random households of Chanh An commune, Vinh Long Province. Aedes larval indices and Mesocyclops prevalence were compared with historical pre- and post-intervention values. In the same commune, using purposeful sampling, sixteen semi-structured interviews (1 villager leader, 1 local doctor, 10 villagers, 2 teachers, 2 entomology officials), and a focus group discussion (6 Mesocyclops program collaborators) explored water storage habits, beliefs about dengue prevention and behaviour related to Mesocyclops. Thematic analysis was conducted to interpret the qualitative findings. Aedes abundance increased after responsibility for Mesocyclops intervention moved from government to community in 2010, with post-transfer surges in Breteau Index, Container Index, and Larval Density Index. Larval increments coincided with decrease in Mesocyclops prevalence. Villagers had some knowledge of dengue but it was conflated with other mosquito borne diseases and understanding of Mesocyclops was incomplete. Program adoption among the villagers was limited. With reduced government support program collaborators reported limited capacity to conduct population monitoring, and instead targeted 'problem' households. Although the Mesocyclops program was highly sustainable in northern and central provinces of Vietnam, the intervention has not been consistently adopted by southern households in Chanh An commune. Limited education, household monitoring and government support are affecting sustainability. Findings were based on a small household sample visited over a short time period, so other evaluations are needed. However, our results suggest that government support for the Mesocyclops program is still required in this part of Vietnam.
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http://dx.doi.org/10.1016/j.actatropica.2014.10.006 | DOI Listing |
Microorganisms
December 2024
Key Laboratory of Aquatic Animal Nutrition and Health, Freshwater Fisheries Research Center, Chinese Academy of Fishery Science, Wuxi 214081, China.
, a parasitic ciliate, causes "white spot disease" in freshwater fish and poses a significant threat to global freshwater aquaculture. Eliminating the free-swimming theront stage from the aquaculture environment is a critical measure for controlling infections. The natural predator of theronts in fish-farming ponds were identified using fluorescent dye-labelled live theronts and quantitative PCR; meanwhile, the zooplankton community composition in the positive ponds of detected by quantitative PCR were analyzed by eDNA metabarcoding assay.
View Article and Find Full Text PDFChemosphere
November 2024
Technical University of Denmark, DTU Offshore, 2800 Lyngby, Denmark. Electronic address:
Mar Pollut Bull
December 2024
Federal University of São Paulo, Institute of the Sea, Department of Marine Sciences, Maria Máximo, 168, Ponta da Praia, 11030-100 Santos, São Paulo, Brazil; Postgraduate Program in Bioproducts and Bioprocesses, Federal University of São Paulo, Campus Baixada Santista, Santos, São Paulo, Brazil.
The potential effects of trace metal pollution in sediment under scenarios of warming and CO-driven acidification on the fecundity of the copepod Nitokra sp. were assessed. Ovigerous females were exposed to laboratory-spiked sediments at two different concentrations of a mixture of metals (Cu, Pb, Zn, and Hg) and to the control (non-spiked sediments), in combinations of two pH (7.
View Article and Find Full Text PDFJ Evol Biol
November 2024
Environmental Studies Program, University of Southern California, Los Angeles, CA, United States.
Eukaryotic energy production requires tight coordination between nuclear and mitochondrial gene products. Because males and females often have different energetic strategies, optimal mitonuclear coordination may be sex-specific. Previous work found evidence for sex-specific mitonuclear effects in the copepod Tigriopus californicus by comparing two parental lines and their reciprocal F1 crosses.
View Article and Find Full Text PDFEnviron Toxicol Chem
December 2024
National Research Council-Research Institute on Terrestrial Ecosystems (CNR-IRET), Florence, Italy.
Aliphatic chlorinated hydrocarbons, notably tetrachloroethylene (also known as perchloroethylene [PCE]), are persistent, mobile, and toxic (PMT) and/or very persistent, mobile, and toxic (vPMT) groundwater pollutants, often exceeding safe drinking water thresholds. The present study delves into the groundwater risk assessment of PCE with a novel focus on the sensitivity of stygobitic species-organisms uniquely adapted to groundwater environments. Through a comparative analysis of the subchronic effects of PCE on the locomotion behavior of two copepod species, the stygobitic Moraria sp.
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