de Barros Fábio Saito Monteiro, Arruda Mércia Eliane, Vasconcelos Simão D, Luitgards-Moura José Francisco, Confalonieri Ulisses, Rosa-Freitas Maria Goreti, Tsouris Pantelis, Lima-Camara Tamara Nunes, Honório Nildimar Alves
Departamento de Zoologia, Universidade Federal de Pernambuco, Recife, PE, Brazil.
J Vector Ecol. 2007 Jun;32(1):54-68. doi: 10.3376/1081-1710(2007)32[54:paacfa]2.0.co;2.
Parity and age composition for Anopheles darlingi and Anopheles albitarsis in the northern Amazon Basin, Brazil, were investigated. Anopheline ovaries and ovarioles were examined in order to determine whether hourly and seasonal parity status for the vectors An. albitarsis and An. darlingi would vary in two different landscapes (forest and savanna/forest) where malaria is endemic in the northern Amazon Basin. A total of 1,199 anophelines (535 An. darlingi and 664 An. albitarsis) was dissected for parity status, ovariole dilatations, and follicular stages. The total number of nulliparous and parous females for both species varied by time of collection, locality, and season. During the rainy season for the first two h of collection, more nulliparous An. albitarsis and An. darlingi females were collected in the first hour (18:00-19:00), but during the second hour (19:00-20:00) more parous females of both species were captured. During the dry season in Copaíbas, more parous females of An. albitarsis were observed in the first hour while more nulliparous females were observed in the second hour. Nulliparous and parous females of both species for both hours were not significantly different at Road 19 in the dry season. This location was characterized by a forest malaria pattern of transmission with higher numbers of parous females and population stability in the dry season. In Copaíbas, the density and parity of An. darlingi increased during the rainy season, and it could be classified as an alluvial malaria pattern of transmission. For Copaíbas, control measures would be more successful if adopted at the transition from dry to rainy season. Further investigation on longitudinal spatio-temporal change in longevity and survival rates would help us to clarify differences in vector competence for An. darlingi and An. albitarsis and add to the understanding of differences regarding prevailing landscapes in malaria epidemiology in the northern Amazon Basin.
对巴西亚马逊盆地北部的达林按蚊和白跗按蚊的胎次和年龄组成进行了调查。检查按蚊的卵巢和卵巢小管，以确定作为媒介的白跗按蚊和达林按蚊的每小时和季节性胎次状态在亚马逊盆地北部疟疾流行的两种不同景观（森林和稀树草原/森林）中是否会有所不同。总共解剖了1199只按蚊（535只达林按蚊和664只白跗按蚊）以确定其胎次状态、卵巢小管扩张情况和卵泡阶段。两种按蚊未产卵和已产卵雌蚊的总数因采集时间、地点和季节而异。在雨季采集的前两个小时内，在第一个小时（18:00 - 19:00）采集到的未产卵白跗按蚊和达林按蚊雌蚊更多，但在第二个小时（19:00 - 20:00）捕获到的两种按蚊的已产卵雌蚊更多。在科帕伊巴斯的旱季，在第一个小时观察到的白跗按蚊已产卵雌蚊更多，而在第二个小时观察到的未产卵雌蚊更多。在旱季的19号公路，两个小时内两种按蚊的未产卵和已产卵雌蚊数量没有显著差异。该地点的特点是森林型疟疾传播模式，旱季已产卵雌蚊数量较多且种群稳定。在科帕伊巴斯，达林按蚊的密度和胎次在雨季增加，可归类为冲积型疟疾传播模式。对于科帕伊巴斯来说，如果在旱季向雨季过渡时采取控制措施，可能会更成功。对寿命和存活率的纵向时空变化进行进一步调查，将有助于我们阐明达林按蚊和白跗按蚊在媒介能力上的差异，并加深对亚马逊盆地北部疟疾流行病学中不同主要景观差异的理解。
