Eutrophication governs predator-prey interactions and temperature effects in Aedes aegypti populations

Krol, Louie; Gorsich, Erin E.; Hunting, Ellard R.; Govender, Danny; Bodegom, Peter M. van; Schrama, Maarten

doi:10.1186/s13071-019-3431-x

Cited by 15 publications

(11 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Together, these results show that human disturbances are strongly associated with increased mosquito abundances and shifts in community composition towards known disease vectors, as illustrated in conceptual Fig. 2 G. They highlight the experimentally-demonstrated importance of changes in environmental conditions 5 , 6 by identifying its consistent pattern across large geographic extents and climatic conditions. These results emphasize that anthropogenic disturbances to the landscape and the larval environment represent an important mechanism driving vector distributions.…”

Section: Resultssupporting

confidence: 59%

“…2G. They highlight the experimentally-demonstrated importance of changes in environmental conditions 5,6 by identifying its consistent pattern across large geographic extents and climatic conditions. These results emphasize that anthropogenic disturbances to the landscape and the larval environment represent an important mechanism driving vector distributions.…”

Section: Resultsmentioning

confidence: 78%

“…1 ); the paired sites have similar geomorphology and climatic conditions (Table S1 , Figure S1 ) but differ in how they are affected by humans. To obtain an overall assessment of anthropogenic disturbance, we quantified 5 ubiquitous anthropogenic pressures 1 : (1) organophosphate pesticide abundance, (2) eutrophication, (3) human population density, (4) ungulate biomass and (5) vegetation loss, at each of the paired locations, all of which have separately been shown to influence mosquito populations 5 , 6 , 10 , 24 .

Figure 1 Variation in anthropogenic pressures comparing waterbodies inside (green triangles) and outside KNP (red symbols).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Human practices promote presence and abundance of disease-transmitting mosquito species

Schrama

Hunting

Beechler

et al. 2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

Humans alter the environment at unprecedented rates through habitat destruction, nutrient pollution and the application of agrochemicals. this has recently been proposed to act as a potentially significant driver of pathogen-carrying mosquito species (disease vectors) that pose a health risk to humans and livestock. Here, we use a unique set of locations along a large geographical gradient to show that landscapes disturbed by a variety of anthropogenic stressors are consistently associated with vector-dominated mosquito communities for a wide range of human and livestock infections. this strongly suggests that human alterations to the environment promote the presence and abundance of disease vectors across large spatial extents. As such, it warrants further studies aimed at unravelling mechanisms underlying vector prevalence in mosquito communities, and opens up new opportunities for preventative action and predictive modelling of vector borne disease risks in relation to degradation of natural ecosystems. Habitat destruction, chemical pollution, and climate change are ongoing human disturbances 1 that have resulted in worldwide shifts in insect communities 2. While most insects are declining 2 , many mosquito species are thriving 3,4. Recent laboratory and mesocosm studies provided important clues suggesting that anthropogenic disturbances can promote population growth of several pathogen-transmitting mosquito species, or disease vectors 5-8 , and potentially mediate interactions between mosquito species 9 , their hosts 10 , their pathogens 11,12 , and their predators 13. This hints that, if these patterns hold true for natural systems, the way humans influence their local environment presents a critical driver of disease risk 14. Field data in natural systems has largely focused on the influence of climate-temperature and precipitationin driving the abundance of single species or vector groups 15-19. These studies constitute an important foundation for mechanistic models and risk maps to anticipate disease outbreaks such as malaria, chikungunya and Zika 20,21. Mosquito abundance and composition can also vary across locations and land use types 22-27. However, many comparisons rely on opportunistic sampling across different time periods or targeted sampling at locations to maximize collections 28 , but not always 29,30. Here, we use a paired sampling design to show that human activities beyond climate are strongly associated with high abundances of known vectors across large spatial extents. Kruger National Park (KNP) is the largest natural reserve in South Africa and is fringed with rural and urbanizing areas. The mosaic of waterbodies along its 400 km north-south gradient provides a unique opportunity to assess the effect of human disturbances on mosquito population dynamics and community composition. We simultaneously sampled representative waterbodies within paired sites inside and outside the national park in four regions (Fig. 1); the paired sites have similar geomorphology and climatic conditions (Table S...

show abstract

Section: Resultssupporting

confidence: 59%

Section: Resultsmentioning

confidence: 78%

Figure 1 Variation in anthropogenic pressures comparing waterbodies inside (green triangles) and outside KNP (red symbols).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Human practices promote presence and abundance of disease-transmitting mosquito species

Schrama

Hunting

Beechler

et al. 2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…Mosquitoes (order: Diptera, family: Culicidae) are known vectors for a wide variety of pathogens. The mosquito community composition is influenced by myriad of biotic and abiotic factors (e.g., resource availability, predation, temperature) that operate mostly at a local scale (Washburn, 1995;Reiter, 2001;Chase and Knight, 2003;Lafferty, 2009;Young et al, 2017;Schrama et al, 2018;Krol et al, 2019). A more comprehensive understanding of the drivers of mosquito community composition, may facilitate better management of mosquito communities (Beketov and Liess, 2007;Stresman, 2010).…”

Section: Introductionmentioning

confidence: 99%

How Does eDNA Compare to Traditional Trapping? Detecting Mosquito Communities in South-African Freshwater Ponds

et al. 2019

Self Cite

View full text Add to dashboard Cite

Improved biomonitoring of mosquitoes requires an in-depth understanding on occurrences of both vector and non-vector species, in larval, and adult stages. Accurate descriptions of the ecological context in which mosquitoes thrive remain limited, particularly for larval stages. The aim of this study was to develop a mixed-amplicon eDNA approach to assess (i) whether mosquito larval communities of stagnant freshwater bodies can be detected using a Culicidae-specific primer and (ii) how these results compare to traditional trapping of adult mosquitoes. Results from 32 ponds inside and outside Kruger National Park, South Africa show that our primer detected mosquito eDNA. However, it yielded only a subset of the species found using adult trapping methods. Particularly the less frequent and container-breeding species were not found. Our approach provides the first steps toward an eDNA-based method to assess the entire community of larval-stage mosquitoes. It may thereby overcome current taxonomic hurdles presented by morphological identification of larvae. As such, it holds great promise for biomonitoring and ecological studies of mosquitoes.

show abstract

“…Naturally, biotic and abiotic factors could affect the development and population dynamics of mosquitoes. For instance, biotic factors such as the availability of food for mosquito larvae could increase their developmental rates, but the presence of predators can reduce the abundance of mosquitoes [53]. In addition, other abiotic factors such as humidity and precipitation can influence the growth and development of mosquitoes.…”

Section: Discussionmentioning

confidence: 99%

Effects of elevated temperatures on the development of immature stages ofAnopheles gambiae (s.l.)mosquitoes

Agyekum

Arko‐Mensah

Botwe

et al. 2022

Tropical Med Int Health

View full text Add to dashboard Cite

Objective This study investigated the effects of temperature on the development of the immature stages of Anopheles gambiae (s.l.) mosquitoes. Methods Mosquito eggs were obtained from laboratory established colonies and reared under eight temperature regimes (25, 28, 30, 32, 34, 36, 38 and 40°C), and 80 ± 10% relative humidity. Larvae were checked daily for development to the next stage and for mortality. Pupation success, number of adults produced and sex ratio of the newly emerged adults were recorded. Larval survival was monitored every 24 h, and data were analysed using Kaplan–Meier survival analysis. Analysis of variance was used where data followed normal distribution, and a Kruskal–Wallis test where data were not normally distributed. Larval and pupal measurements were log‐transformed and analysed using ordinary least square regression with robust standard errors. Results Increasing the temperature from 25 to 36°C decreased the development time by 10.57 days. Larval survival (X2(6) = 5353.12, p < 0.001) and the number of adults produced (X2(5) = 28.16, p < 0.001) decreased with increasing temperature. Increasing temperatures also resulted in significantly smaller larvae and pupae (p < 0.001). At higher temperatures, disproportionately more male than female mosquitoes were produced. Conclusions Increased temperature affected different developmental stages in the life cycle of An. gambiae (s.l.) mosquitoes, from larval to adult emergence. This study contributes to the knowledge on the relationship between temperature and Anopheles mosquitoes and provides useful information for modelling vector population dynamics in the light of climate change.

show abstract

Eutrophication governs predator-prey interactions and temperature effects in Aedes aegypti populations

Cited by 15 publications

References 34 publications

Human practices promote presence and abundance of disease-transmitting mosquito species

Human practices promote presence and abundance of disease-transmitting mosquito species

How Does eDNA Compare to Traditional Trapping? Detecting Mosquito Communities in South-African Freshwater Ponds

Effects of elevated temperatures on the development of immature stages ofAnopheles gambiae (s.l.)mosquitoes

Contact Info

Product

Resources

About