• Energy Research
• 2016-2025close

Transmission of vector-borne pathogens can vary in complexity from single-vector, single-host systems through to multivector, multihost vertebrate systems. Understanding the dynamics of transmission is important for disease prevention efforts, but is dependent on disentangling complex interactions within coupled natural systems. Ross River virus (RRV) is a multivector multihost pathogen responsible for the greatest number of notified vector-borne pathogen infections in humans in Australia. Current evidence suggests that nonhuman vertebrates are critical for the maintenance and spillover of RRV into mosquito populations. Yet, there is a limited knowledge of which mosquito vector species and amplifying vertebrate host species are most important for transmission of RRV to humans. We conducted field surveys of nonhuman vertebrates and mosquitoes in the RRV endemic city of Brisbane, Australia, to assess the effect of vector and host community structure on human RRV notifications. Six suburbs were selected across a gradient of human disease notification rates. Differences in vertebrate and mosquito compositions were observed across all suburbs. Suburbs with higher RRV notification rates contained greater vertebrate biomass (dominated by the presence of horses) and higher mosquito abundances. This study suggests that horse-mosquito interactions should be considered in more detail and that vertebrate biomass and mosquito abundance be incorporated into future RRV modeling studies and considered in public health strategies for RRV management.

The hunting and consumption of wild meat (bushmeat) is recognized as a key threat to the world’s biodiversity and there are indications this threat may extend to much of the African continent. However, this problem is understudied in African savannah systems—particularly in southern Africa. Due to its illicit nature, little research on the drivers behind hunting and consumption exists, especially using methods appropriate to the topic’s sensitivity. We explored the prevalence of hunting and consumption of wild meat in the low-income country of Malawi, by conducting 1562 interviews in communities neighbouring four different protected areas. We identified characteristics of households illegally hunting and consuming wild meat, using the unmatched count technique and socio-demographic variables in linear models. Consumption had a higher prevalence than hunting, reaching up to 39% of the population, while 4–19% of the population engaged in hunting. Consumption was more prevalent in poorer households, while hunting was more prevalent in wealthier households. Increased involvement in community projects initiated by protected areas did not always lead to reduced consumption or hunting, including at protected areas with substantial outside investment, indicating these projects need a clearer link to conservation outcomes. A preference for the taste of wild meat and for added diversity in diet were key drivers of consumption, whereas hunting was primarily motivated by the need for income. Our results highlight the disparity between drivers of hunting and consumption of wild meat and the pervasive nature of this threat, despite considerable investment into community projects and enforcement.