scholarly journals Suboptimal larval habitats modulate oviposition of the malaria vector mosquitoAnopheles gambiae

2015 ◽  
Author(s):  
Eunho Suh ◽  
Dong-Hwan Choe ◽  
Ahmed M Saveer ◽  
Laurence J Zwiebel
Keyword(s):  
Malaria Vector ◽  
Site Selection ◽  
Oviposition Preference ◽  
Oviposition Site ◽  
Oviposition Site Selection ◽  
Larval Habitats ◽  
Dimethyl Disulphide ◽  
Gravid Females ◽  
Oviposition Sites ◽  
Selection Of

Selection of oviposition sites by gravid females is a critical behavioural preference in the reproductive cycle ofAnopheles gambiae, the principal Afrotropical malaria vector mosquito. Several studies suggest this decision is mediated by semiochemicals associated with potential oviposition sites. To better understand the chemosensory basis of this behaviour and identify compounds that can modulate oviposition, we examined the generally held hypothesis that suboptimal larval habitats give rise to semiochemicals that negatively influence the oviposition preference of gravid females. Dual-choice bioassays indicated that oviposition sites conditioned in this manner do indeed foster significant and concentration dependent aversive effects on the oviposition site selection of gravid females. Headspace analyses derived from aversive habitats consistently noted the presence of dimethyl disulphide (DMDS), dimethyl trisulphide (DMTS) and 6-methyl-5-hepten-2-one (sulcatone) each of which unitarily affectedAn. gambiaeoviposition preference. Electrophysiological assays across the antennae, maxillary palp, and labellum of gravidAn. gambiaerevealed differential responses to these semiochemicals. Taken together, these findings validate the hypothesis in question and suggest that suboptimal environments forAn. gambiaelarval development results in the release of DMDS, DMTS and sulcatone that impact the response valence of gravid females to directly modulate the chemical ecology of oviposition site selection.

THE EFFECT OF CONSPECIFICS ON OVIPOSITION SITE SELECTION AND OVIPOSITION BEHAVIOUR IN AEDES TOGOI (THEOBOLD) (DIPTERA: CULICIDAE)

1997 ◽  
Vol 129 (6) ◽  
pp. 1173-1176 ◽  
Author(s):  
David Y. Onyabe ◽  
Bernard D. Roitberg
Keyword(s):  
Intraspecific Competition ◽  
Site Selection ◽  
Oviposition Preference ◽  
Food Supplements ◽  
Oviposition Site ◽  
Conspecific Attraction ◽  
Oviposition Site Selection ◽  
Suitable Site ◽  
Aedes Togoi ◽  
Oviposition Sites

AbstractTwo opposing hypotheses are tested regarding the choice of oviposition sites by female Aedes togoi (Theobold) mosquitoes: (i) conspecific avoidance—females discriminate against sites harboring conspecifics to reduce intraspecific competition for their offspring and (ii) conspecific attraction—females prefer sites with conspecifics because their presence indicates suitable conditions for larvae. Under laboratory conditions, A. togoi females laid many more eggs on rearing water (LRW) containing conspecific larvae, their waste, bacteria, and food supplements than on rearing water alone (RM). In another experiment, females showed an oviposition preference for LRW sites that were devoid of A. togoi eggs compared with those harboring 50 (0.3 eggs/mL) conspecific eggs. Further, it was discovered that females laid their eggs at several sites rather than at a single suitable site. Possible reasons for such choices are discussed.

scholarly journals Sex-Specific Oviposition Site Selection and Hatching Success in an Arboreal Treefrog: Implications of a Paternal Nest-Site Selection

2021 ◽  
Author(s):  
Ming-Feng Chuang ◽  
Nien-Tse Fuh ◽  
Sinlan Poo ◽  
Yeong-Choy Kam
Keyword(s):  
Water Depth ◽  
Female Choice ◽  
Site Selection ◽  
Nest Site ◽  
Hatching Success ◽  
Oviposition Site ◽  
Offspring Survival ◽  
Oviposition Site Selection ◽  
Resource Defense ◽  
Oviposition Sites

Abstract Oviposition sites selected by parents is an important factor that affects offspring survival and parental fitness. A good nest site offers offspring protection from competition, predation, and harsh environmental conditions. In amphibians, though oviposition sites are generally determined by females, the distinction between male and female choice can be blurred in species with resource defense mating systems, where males occupy the territory that eggs are deposited before advertising for females. Using a phytotelm-breeding frog (Kurixalus eiffingeri) with male territoriality and biparental care, we examined 310 oviposition sites to determine (1) male choice based on physical characteristics of the site (stump height, inner diameter, stump depth, water depth), and (2) female choice based on site characteristics and male characteristics (snout-vent length and body condition). We hypothesized that either one or both sexes would select oviposition site based on characteristics correlate with higher offspring survivorship. We found that males preferred sites with deeper pools of water, while females showed no preference for sites or males based on the characteristics observed. While we cannot prove any nest traits directly benefit offspring, we contend that increased water depth within the phytotelm may 1) protect male frog from snake predation, which would allow for continued paternal care that increases the hatching success and 2) improve the offspring survival during the larval period. Our findings provide empirical evidence of male-driven oviposition site selection in an amphibian and highlight often overlooked role that males play in increasing their reproductive output by selecting for sites that benefit their offspring.

Oviposition site selection of the Alcon blue butterfly at the northern range margin

2016 ◽  
Vol 20 (6) ◽  
pp. 1059-1067 ◽  
Author(s):  
Margus Vilbas ◽  
Toomas Esperk ◽  
Triin Edovald ◽  
Ants Kaasik ◽  
Tiit Teder
Keyword(s):  
Site Selection ◽  
Oviposition Site ◽  
Oviposition Site Selection ◽  
Range Margin ◽  
Alcon Blue ◽  
Blue Butterfly ◽  
Selection Of
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