西藏的舞虻(Ⅱ)合室舞虻亚科

本文为西藏的舞虻分类研究第二部分,记述了合室舞虻亚科3个属15个新种。     

四川的驼舞虻属四新种（双翅目：舞虻科）

本文记述了四川省驼舞虻属(Hybos)4新种及1新记录种。它们是:毛饰驼舞虻(H·marginatus),侧突驼舞虻(H·lateralis),峨眉驼舞虻(H·emeishanus),灌县驼舞虻(H·guanxianus)和剑突驼舞虻(H·ensa-tus)。     

Space heterogeneity,space use and short-range dispersal in Diptera: A case study

This study investigates the impact of landscape heterogeneity on community structure and population dynamics in two families of Diptera (Empididae and Chironomidae). Adult emergence is compared with aerial flow by means of emergence traps and yellow traps on a transect across four habitats (pond banks, woodland, grassland and heathland) in close proximity to each other. Empids use different space units according to their larval development, sexual behaviour and food requirements. This creates an intermingling of species and individuals originating from different habitats in the lowest part of the transect. Adult chironomids of aquatic species exhibit a preferential use of open habitats while adults with terrestrial larvae disperse largely above the four sites. Habitat fragmentation and heterogeneity lead to opposite patterns in chironomid distribution: some species disperse over the whole set of macrohabitats but others are confined to a single patch, resulting in population isolation. The impact of spatial and temporal landscape patterning is discussed with a view to community structure, life-history tactics and population dynamics.     

Feeding ecology of redside dace, Clinostomus elongatus

Abstract– Redside dace, Clinostomus elongatus (Kirtland), from two populations in New York, USA, consumed adult Diptera; over 85% of the prey taken between April and November was in this order. Adult Hilara spp. (Empididae) were the dipterans consumed most frequently; individuals of this genus represented 70% and 60% of the items consumed by fishes from populations in Allcgheny and Hudson River drainages, respectively. Over 98% of the prey consumed by redside dace was in ten insect orders. Adult and larval chironomids and adult trichopterans were the next most frequently consumed prey. Adult chironomids made up 9% of the diet, by number, in both populations. Adult trichopterans accounted for 2–3% of the items taken. Adult empidids were selected by individuals in both populations. The dominance of flying insects in the diet of redside dace is related to their foraging behavior. These data show that adjacent terrestrial environments may be important to some stream-dwelling organisms.