碗莲新品种选育研究

本文阐述了作者1982—1987年选育碗莲新品种的试验方法和研究结果。通过实生苗选种和杂交育种,1982—1983年获得碗莲F_1代种子,分别在次年将其直接栽植于钵、碗中,从中选育出12个花型新颖、花色艳丽、适宜家庭种植的优良碗莲新品种。几年的试验证明:实生种苗具有方法简便,有利于发展推广的特点。     

Alternative oviposition behaviours in three New Zealand corduliid dragonflies: their adaptive significance and implications for male mating tactics

Oviposition behaviours of female, and mate acquisition and defence behaviours of male, 'Procordulia' grayi, Procordulia smithii and Hemicordulia australiae (three phylogenetically close corduliid species) are contrasted. Twelve distinct methods of oviposition occur involving different motor patterns. These different oviposition behaviours place ova into different microhabitats. Each species has a distinct repertoire of oviposition methods, with only one of the 12 methods occurring in more than one species. The oviposition behaviours differ in their susceptibility to male interference. The implications for male sperm displacement tactics and for the development of conditional male strategies are discussed. Male mating behaviour varies with the geometry of the breeding site, in a manner consistent with an ideal free distribution model where females vary in their 'value' through differential susceptibility to takeover by other males. It is shown that differential susceptibility of females to takeover would stabilize the observed mixed mating strategy among male 'P.' grayi and P. smithii .     

Stelar structure ofAsplenium obtusifolium and its allied species in the New World tropics,with comparison to the Asian members ofAsplenium sect.Hymenasplenium

The stelar structure ofAsplenium obtusifolium and its related species (A. repandulum, A. riparium, A. triquetrum, A. volubile, A. purpurascens, A. ortegae, A. delitescens, A. hoffmannii, andA. laetum) in the New World tropics was observed and compared to that of Asian species ofAsplenium sect.Hymenasplenium. Both of the groups were found to share peculiar stelar structures: steles with two meristeles, a broader ventral and a narrower dorsal, each providing one of the two leaf traces; leaf gaps arranged in two rows between the dorsal and ventral strands, which are connected by thin meristeles, delimiting the leaf gaps. These structures are distinct from the radial symmetrical ones general inAsplenium. Together with cytological evidence, this strongly indicates that the New and Old World groups are closely related. Thus, these Neotropical species should be included in sect.Hymenasplenium.     

蚜科一新属一新种记述：同翅目：蚜总科

本文记述中国蚜虫1新属——丁化长管蚜属Chitinosiphum,模式种为丁化长管蚜C.abdomenigrum,sp.nov.,其寄主为瑞苓草Saussurea nigrescens Maxim,产地为中国陕西。     

Preliminary testing of Anostraca from Italy for use in freshwater fish culture

Annual production of age-1 and age-2 crayfish of three populations in the New River, West Virginia, was quantified and then compared to previously reported harvest of crayfish by a bait fishery. Sampling of crayfish within circular plots and age and growth analyses aided estimation of crayfish production. Orconectes sanbornii sanbornii has a two-year life cycle, and Cambarus sciotensis and Orconectes virilis had three-year life cycles. Production by age-1 and age-2 crayfish (all species) was about 7.0 g live weight m⁻² yr⁻¹; almost half of this production was by C. sciotensis. Greater crayfish density and therefore production occurred in riffles than in pools. Annual crayfish harvest by anglers and commercial catchers was equivalent to about 5% of annual crayfish production.     

Multivariate analysis of periphytic and benthic diatom assemblages from Papua New Guinea

The benthic and periphytic diatom flora is studied in 136 fresh waters in Papua New Guinea. DCA ordination and TWINSPAN are used to describe 20 diatom assemblages. Conductivity, water temperature and altitude are the main sources for the variation in the data. Laing Island Biological Station publication n° 214 Laing Island Biological Station publication n° 214     

中国荨麻科植物小志（二）

在本文中2种名和2变种名被作为异名;Boehmeria delavayiGagnep.被证实为雾水葛属植物,降级作为雅致雾水葛的变种;Pellioniatrichosantha Gagnep.的采自云南东北部的合模式乃是属于楼梯草属的植物;4种和2变种的地理分布扩大。     

哑蟋属六新种记述（直翅目：蟋蟀科）

哑蟋属(Goniogryllus)隶属于直翅目蟋蟀科(Gryllidae)蟋蟀亚科(Gryllinae),由Cho-Pard(1936)以产于我国福建的刻点哑蟋G.punctatus为模式种建立。本属原已知4种,其中两种产于我国,1种分布于日本,1种分布于印度。本文将报道6新种,至此哑蟋属即增至10种。模式标本保存于中国农科院植保所标本馆。