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Females of the haematophagous bug Rhodnius prolixus attach their eggs in clusters on substrates related to their hosts, such as nests or avian feathers. Because the hosts are an enormous food resource as well as potential predators, the choice of the site and pattern of oviposition could have an important adaptive value. Here we investigated proximate and a potential ultimate cause of this aggregated pattern of laid eggs. First, we studied proximal causes by analyzing the use of chemical or physical cues associated with aggregated oviposition in R. prolixus. For all terrestrial organisms there is a trade-off between exchange of respiratory gases and water loss. Particularly, insect eggs are highly susceptible to this trade-off because they do not obtain water from the environment, hence our second objective is to study the possible mechanisms involved in dehydration resistance in this species. Therefore we examined the dynamics of change in CO 2 release rate (ṀCO 2 ), and water loss rate (ṀH 2 O) in relation to embryo development as energetic demands increase, and tested the energetic or hygric efficiency hypothesis as a potential ultimate cause of aggregated oviposition. This hypothesis states that grouped eggs consume less energy or lose less water than equal numbers of isolated eggs, the latter being more susceptible to dehydration. Results indicated the use of physical external cues such as dummy eggs or edges of the oviposition substrates, but we did not find any chemical cues associated with the aggregated pattern of oviposition. There are no energetic or hygric benefits associated with egg's aggregated pattern. However, when we analyzed the ṀCO 2 and ṀH 2 O change in relation to embryo development, we found a fairly constant and low ṀH 2 O albeit a clear increase in ṀCO 2 , suggesting a tightly control of egg's desiccation tolerance. This high resistance to desiccation coupled with a temporal strategy of hatching allows R. prolixus embryos to successfully develop and hatch under harsh environmental conditions. © 2016 Elsevier Ltd


Documento: Artículo
Título:Aggregated oviposition in Rhodnius prolixus, sensory cues and physiological consequences
Autor:Rolandi, C.; Schilman, P.E.
Filiación:Departamento de Biodiversidad y Biología Experimental (DBBE), Facultad de Ciencias Exactas y Naturales (FCEyN), Universidad de Buenos Aires (UBA), Argentina
Instituto de Biodiversidad y Biología Experimental y Aplicada (IBBEA), CONICET-UBA, Argentina
Palabras clave:Egg laying behavior; Insect eggs; Metabolic rate; Open flow respirometry; Water loss; desiccation; egg; environmental conditions; fitness; hatching; host; insect; oviposition; physiology; sensory system; site selection; trade-off; Aves; Hexapoda; Rhodnius prolixus; carbon dioxide; water; animal; association; chemotaxis; egg laying; embryo development; female; growth, development and aging; metabolism; ovum; physiology; Rhodnius; scanning electron microscopy; ultrastructure; Animals; Carbon Dioxide; Chemotaxis; Cues; Embryonic Development; Female; Microscopy, Electron, Scanning; Oviposition; Ovum; Rhodnius; Water
Página de inicio:74
Página de fin:82
Título revista:Journal of Insect Physiology
Título revista abreviado:J. Insect Physiol.
CAS:carbon dioxide, 124-38-9, 58561-67-4; water, 7732-18-5; Carbon Dioxide; Water


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---------- APA ----------
Rolandi, C. & Schilman, P.E. (2017) . Aggregated oviposition in Rhodnius prolixus, sensory cues and physiological consequences. Journal of Insect Physiology, 98, 74-82.
---------- CHICAGO ----------
Rolandi, C., Schilman, P.E. "Aggregated oviposition in Rhodnius prolixus, sensory cues and physiological consequences" . Journal of Insect Physiology 98 (2017) : 74-82.
---------- MLA ----------
Rolandi, C., Schilman, P.E. "Aggregated oviposition in Rhodnius prolixus, sensory cues and physiological consequences" . Journal of Insect Physiology, vol. 98, 2017, pp. 74-82.
---------- VANCOUVER ----------
Rolandi, C., Schilman, P.E. Aggregated oviposition in Rhodnius prolixus, sensory cues and physiological consequences. J. Insect Physiol. 2017;98:74-82.