Walton W E, Workman P D
Department of Entomology, University of California, Riverside 92521, USA.
J Am Mosq Control Assoc. 1998 Mar;14(1):95-107.
The species composition and abundance of larval mosquitoes were studied in the vegetated regions of 2 types of experimental constructed wetlands: one-phase marshes, which have continuous vegetation throughout the marsh, and 3-phase marshes, which have 2 vegetated regions separated by a region of comparatively deeper open water. Larvae of Culex spp. were significantly more abundant in one-phase marshes than in 3-phase marshes. Larval populations in one-phase marshes also contained proportionately more older larval instars (stages III and IV) than did populations in 3-phase marshes. Mortality rates of larvae increased during the summer and were higher in 3-phase marshes than in one-phase marshes during the initial 6 wk of the study. Differences in mortality rates between marsh types were related to predator abundance during the first 6 wk of the study and thereafter were not strongly associated with predator populations. An infusion of decaying bulrush (Schoenoplectus californicus) stimulated oviposition by gravid Culex stigmatosoma more than by gravid Culex quinquefasciatus and Culex tarsalis. Culex erythrothorax was the most abundant host-seeking species collected in CO2-baited traps; however, larvae were rarely collected during routine dip sampling and egg rafts were never collected in oviposition studies.
单相沼泽，整个沼泽都有连续的植被；三相沼泽，有两个植被区域，中间被一片相对较深的开阔水域隔开。库蚊属幼虫在单相沼泽中的数量明显多于三相沼泽。单相沼泽中的幼虫种群中，老龄幼虫（III龄和IV龄）的比例也比三相沼泽中的幼虫种群更高。幼虫死亡率在夏季上升，在研究的最初6周内，三相沼泽中的死亡率高于单相沼泽。沼泽类型之间死亡率的差异在研究的前6周与捕食者的丰度有关，此后与捕食者种群的关联并不紧密。注入腐烂的芦苇（加州灯心草）对孕性污跗库蚊产卵的刺激比对致倦库蚊和环跗库蚊更大。红胸库蚊是在二氧化碳诱饵诱捕器中捕获的最常见的宿主搜寻物种；然而，在常规的舀取采样中很少收集到幼虫，在产卵研究中也从未收集到卵块。
