Fecundity, parity, and adult feeding relationships among Nyssorhynchus malaria vectors from Venezuela

Lounibos, L. Phillip; Conn, Jan E.

doi:10.1590/s0074-02761991000100010

Cited by 12 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previously reported mean fecundities of field-collected, inseminated A . nuneztovari and A. marajoara from Venezuela (SO) were 140.3 * 32.2 (SD) and 142.8 +-44.5 (SD), values which are significantly larger than the mean fecundities of virgin females of the same species from the same site (Table 2 and Lounibos & Conn, 1991). These comparisons suggest an enhancement of fecundity due to mating in both species, although the magnitude of the effect is greater in A.nuneztovari.…”

Section: Resultsmentioning

confidence: 79%

“…These comparisons suggest an enhancement of fecundity due to mating in both species, although the magnitude of the effect is greater in A.nuneztovari. Virgin females of the latter species also take significantly smaller blood meals than equivalently sized A.marajoara or A.aquasalis (Lounibos & Conn, 1991). Nulliparous Anopheles gambiue Giles, which usually consume blood before mating, also are known to take small initial blood meals (GilIies, 1954).…”

Section: Resultsmentioning

confidence: 99%

“…In a study on reproduction by neotropical malaria vectors, it was noted that most virgin Anopheles nuneztovari Gabaldon failed to develop eggs after sugar and blood feeding, and that the numbers of eggs matured by these females were low compared with mated individuals of the same species (Lounibos & Conn, 1991). Although a requirement for multiple blood meals was invoked as a possible explanation, two successive blood feeds did not significantly increase the percentage of non-inseminated A .…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Variable egg development among Anopheles (Nyssorhynchus): control by mating?

Lounibos

1994

Physiological Entomology

Self Cite

View full text Add to dashboard Cite

Among ten species of neotropical malaria vectors the frequency of egg development by virgin females fed both sugar and blood vaned from 23% to 100% and was positively correlated with their mean fecundity. The mean volume of male accessory glands of these same species varied more than 10-fold and was negatively correlated with population-or species-specific incidence of egg development by virgin females. The accessory glands of Anopheles nuneztovari Gabaldon and Anopheles rangeli Gabaldon, Cova Garcia & Lopez are much greater in size than those of the other eight species and are believed to contain secretory materials that stimulate egg production following mating. Insemination did not stimulate egg development in Anopheles albimanus Wiedemann whose males possess comparatively small accessory glands.

show abstract

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Variable egg development among Anopheles (Nyssorhynchus): control by mating?

Lounibos

1994

Physiological Entomology

Self Cite

View full text Add to dashboard Cite

show abstract

“…Because larval and adult sizes are correlated ( Lyimo et al 1992 ), competition results in smaller adults. Mosquitoes of smaller body size have been reported to survive less well than larger ones in several species (Nasci 1986(Nasci a,b, 1987Kitthawee et al 1990Kitthawee et al , 1992Lounibos and Conn 1991;Ameneshewa and Service 1996;Takken et al 1998 ). A combination of these factors could explain a decrease in malaria transmission ( Kitthawee and Edman 1995 ) within irrigated areas.…”

mentioning

confidence: 99%

Is Vector Body Size the Key to Reduced Malaria Transmission in the Irrigated Region of Niono, Mali?

et al. 2006

View full text Add to dashboard Cite

Malaria vectors can reach very high densities in villages near irrigated rice fields in Africa, leading to the expectation that malaria should be especially prevalent there. Surprisingly, this is not always the case. In Niono, Mali, villages from nonirrigated areas have higher malaria prevalence than those within the irrigated regions, which suffer from higher mosquito numbers. One hypothesis explaining this observation is that mosquitoes from irrigated fields with high densities are inefficient vectors. This could occur if higher larval densities lead to smaller mosquitoes that suffer elevated mortality. Three predictions of the hypothesis were studied. First, the effect of larval density on larval body size was measured for both Anopheles gambiae Giles and Anopheles funestus Giles. Second, the relationship between larval and adult body size was tested. Third, evidence of an effect of adult size on survivorship in both irrigated and nonirrigated villages during the wet and dry seasons was sought. There was a modest positive relationship between densities of immatures and larval size, and a strong relationship between larval and adult size. Furthermore, adult survivorship was higher in nonirrigated areas. However, there was no effect of size on survivorship between comparable samples from both the irrigated and nonirrigated zones. Although density may have a causal relationship with reduced transmission in the irrigated areas of Niono, it is unlikely to be because higher density leads to smaller body size and lower survivorship. KeywordsAnopheles; irrigation; size; density; survivorship Irrigation in Sub-Saharan Africa can be a mixed blessing. It contributes to greater food production and income; however, it may increase the incidence of diseases such as schistosomiasis and malaria (Service 1989 a,b;Dzodzomenyo et al. 1999;van der Hoek 2004 ). It is surprising, then, that several investigators have reported malaria transmission to be the same, or even less, in irrigated areas with high vector densities than in nearby nonirrigated areas with lower numbers of mosquitoes ( Ijumba and Lindsay 2001, Diuk-Wasser et al. 2005a ). For example, Dolo et al. (2004) Sissoko et al. 2004 ). Reasons for this departure from expectation may include 1) the nuisance of so many mosquitoes might compel more people to use bednets; 2) the greater prosperity of irrigated areas might permit access to better health care, protection, or both; or, 3) the mosquitoes that emerge from the high-density irrigated areas during the rainy season might be less efficient at transmitting malaria, e.g., if they do not survive as well ( Diuk-Wasser et al. 2005a ).This study tests the hypothesis that body size is the cause of reduced vector survivorship at high density, leading to lower malaria transmission measured by vectorial capacity ( Diuk-Wasser et al. 2005a ) and prevalence ( Sissoko et al. 2004 ) in the irrigated areas of Niono. Several aspects of this hypothesis are supported by previous work; in the irrigated zone, high density during ...

show abstract

“…Sugar feeding has been shown to continue throughout diapause in Culex tarsalis during mild winters (Reisen et al, 1986). Furthermore, newly emerged females of small size have been shown to require an initial sugar or blood meal to develop their follicles to stage II before undergoing vitellogenesis and egg maturation (Lounibos and Conn, 1991; Briegel and Horler, 1993). Sugar also plays an important role in the early stages of adult development and, in nature, the availability and abundance of sugar sources determine the frequency of sugar feeding (Van Handel et al, 1994; Martinez-Ibarra et al, 1997; Gu et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Volatile phytochemicals as mosquito semiochemicals

Nyasembe

Torto

2014

Phytochemistry Letters

View full text Add to dashboard Cite

Plant biochemical processes result in the release of an array of volatile chemical substances into the environment, some of which are known to play important plant fitness enhancing functions, such as attracting pollinators, thermal tolerance of photosynthesis, and defense against herbivores. Cunningly, phytophagous insects have evolved mechanisms to utilize these volatiles to their own advantage, either to colonize a suitable host for feeding, reproduction and oviposition or avoid an unsuitable one. The volatile compounds involved in plant–insect chemical interactions have been widely exploited in the management of agricultural pests. On the other hand, use of plant volatiles in the management of medically important insects is limited, mainly due to paucity of information on their role in disease vector–plant interactions. To date, a total of 29 plant volatile compounds from various chemical classes, including phenols, aldehydes, alcohols, ketones and terpenes, have been identified as mosquito semiochemicals. In this review, we present highlights of mosquito–plant interactions, the available evidence of nectar feeding, with particular emphasis on sources of plant attractants, methods of plant volatile collection and the candidate plant volatile compounds that attract mosquitoes to nectar sources. We also highlight the potential application of these phytochemical attractants in integrated mosquito management.

show abstract

Fecundity, parity, and adult feeding relationships among Nyssorhynchus malaria vectors from Venezuela

Cited by 12 publications

References 0 publications

Variable egg development among Anopheles (Nyssorhynchus): control by mating?

Variable egg development among Anopheles (Nyssorhynchus): control by mating?

Is Vector Body Size the Key to Reduced Malaria Transmission in the Irrigated Region of Niono, Mali?

Volatile phytochemicals as mosquito semiochemicals

Contact Info

Product

Resources

About