首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到10条相似文献,搜索用时 203 毫秒
1.
2.
A contribution to the knowledge of the anostracan fauna of Iran   总被引:1,自引:1,他引:0  
Mura  G.  Azari Takami  G. 《Hydrobiologia》2000,441(1):117-121
We report the finding of three anostracan species, Chirocephalus skorikowi Daday, 1913, Branchinecta orientalis Sars, 1901 and Branchinella spinosa. Milne-Edwards, 1840 in different localities in northwestern Iran. C. skorikowi was recorded in a lake at an elevation of 2400 m, whereas B. orientalis was found in a pond at 1280 m a.s.l. Co-existing B. spinosa and B. orientalis were collected in a pool close to the town of Tabriz, formerly indicated by Brehm (1954) as Estakr Chah, presently named EalGoli. Unlike Brehm (1954), we did not find Streptocephalus in the area of Tabriz.  相似文献   

3.
Anostraca,Cladocera and Copepoda of Spanish saline lakes   总被引:6,自引:6,他引:0  
M. Alonso 《Hydrobiologia》1990,197(1):221-231
A study of 102 samples from almost all salt water bodies in Spain has allowed the preparation of a comprehensive list of anostracans, cladocerans and copepods living in such extreme environments. Among the 26 species recorded, 9 are halobionts, but 17 can exist in less saline waters. Of the halobionts, several are widely distributed throughout arid areas around the Mediterranean (Arctodiaptomus salinus, Cletocamptus retrogressus, Branchinectella media, Branchinella spinosa, Daphnia mediterranea, Moina salina); Branchinecta orientalis ( = B. cervantesi) only appears in Guadiana watershed and toward the east of Hungary, and the Alona belonging to the A. elegans complex is a Spanish endemic. In the second group are many typically freshwater species which also appear occasionally in saline waters, and colonizers of wetlands in steppes, characteristically adapted to a wide range of salinity; one of the formers, Diaphanosoma cf. mongolianum, deserves closer study. The Spanish halobiontic fauna seems to be very old judging by the existence of some isolated species, e.g. B. orientalis may be a Tertiary relic. Persistence through time could have resulted from the continuous aridity of some Iberian localities during the Pleistocene and the ecological constancy of wetlands maintained by regional groundwater discharges.  相似文献   

4.
5.
T. C. Hawes 《Polar Biology》2008,31(10):1287-1289
Direct observations of feeding behaviour in Branchinecta gaini are described. B. gaini possess sophisticated food manipulation behaviours, using their abdominal appendages to ‘scrape’ at and carry away food items. Scraping behaviour was employed by animals for both detrital feeding and the cannibalisation of dead conspecifics. In the absence of like observations from other non-raptatory species of Branchinecta, it appears that adults of B. gaini occupy an intermediary position between species that feed exclusively on vegetative and detrital material and those (e.g. B. gigas, B. ferox, B. raptor) that are known to be carnivorous. In an Antarctic context, particularly, specialisation towards carnivory would have little adaptive value, while expansion of diet breadth via increased manipulative and digestive flexibility would, on the other hand, be advantageous. These behaviours, moreover, mean that B. gaini plays an active role in the breakdown and recycling of its own nutrient base.  相似文献   

6.
Three of the five European species of Branchinecta have a disjunct distribution. In this study, we analyze populations of B. ferox and B. orientalis for mitochondrial (cox1) and nuclear (ITS2) molecular markers. We compare intraspecific genetic divergences between geographically distant populations of B. orientalis, from its only known Spanish population (originally described as B. cervantesi) and from a Hungarian population (assigned to B. orientalis since its discovery), with data from two relatively close Iberian populations of B. ferox. Results indicate that isolation between B. ferox and B. orientalis clades is ancient, and that the clade including the two Iberian populations of B. ferox is geographically structured. Conversely, Iberian and Hungarian populations of B. orientalis do not show geographical structure for the mitochondrial fragment. Lack of geographic structure coupled with very low genetic distances indicates that current Iberian and Hungarian populations of B. orientalis originated from a common population stock, and that the time elapsed since their separation has not been long enough to render the clades reciprocally monophyletic. We hypothesize that colonization of the Iberian Peninsula by B. orientalis is probably the consequence of a single recent dispersal event, and consequently we confirm the synonymy between B. cervantesi and B. orientalis.  相似文献   

7.
Branchinecta oterosanvicentei, new species, a fairy shrimp endemic to the south of Coahuila, Mexico is described and figured. Differential features between the new species and the related B. lindahli are discussed on the basis of a SEM micrographs. The main diagnostic characters of Branchinecta oterosanvicentei are: (1) a pulvinus covered by scales localized on the middle of the median side of the proximal article of antenna, and (2) a network of prominent cortical crests on the cyst surface. Of seven Branchinecta species occurring in Mexico, four (B. belki, B. mexicana, B. oterosanvicentei, and B. sandiegonensis) have a restricted geographic range. Because, in addition, extreme fluctuations in the number of mature individuals per population occur, the survival of all of these species is threatened, and measures should be taken to protect them. Branchinecta mackini has a wide distribution in North America, but even this form is rare in Mexico.  相似文献   

8.
Hungarian sodic water bodies have a rich macro- and microcrustacean fauna due to the lack of fish populations. The crustacean population is very abundant, for this reason these wetlands provide good feeding resources for waterbirds. The density of macro- and microcrustacean populations together with feeding waterbirds was investigated in March, April, and May of 2002, on two characteristic sodic pans, “Kelemen-szék” and “Zab-szék”. The following dabbling-filtering waterfowls and pelagic forager wader species were counted: northern pintail (Anas acuta), northern shoveler (Anas clypeata), garganey (Anas querquedula), common teal (Anas crecca), avocet (Recurvirostra avosetta), spotted redshank (Tringa erythropus), greenshank (Tringa nebularia), and marsh sandpiper (Tringa stagnatilis). The dominant macrocrustacean species was the [Anostraca – Branchinectidae] natronophile Branchinecta orientalis, and its density was significantly higher in Zab-szék than in Kelemen-szék. The microcrustacean zooplankton community was also different in the pans, [Cladocera] Daphnia magna density was significantly higher in Kelemen-szék than in Zab-szék, but the density of the [Copepoda] natronophile Arctodiaptomus spinosus, was higher in Zab-szék than in Kelemen-szék. The density of the investigated waterbird species was also significantly higher in Zab-szék than in Kelemen-szék during spring. We can conclude that the macrocrustacean B. orientalis is one of the most important potential food resources for migrating pelagic foraging waders in spring on characteristic Hungarian sodic pans. However, the most abundant available food item for waterbirds are copepod microcrustacean zooplankton, which have a biomass that is larger by approximately one order of magnitude than the macrocrustacean zooplankton biomass. Considering the lack of submerged water vegetation, we suggest that planktonic microcrustaceans are an important food resource for dabbling-filtering ducks because they can utilise the small crustacean biomass more effectively than the less abundant and rapidly moving macrocrustacean B. orientalis.  相似文献   

9.
该文在对中国西藏色季拉山苔藓植物野外采集和鉴定的基础上,报道了西藏合叶苔属新资料。结果表明:合叶苔属植物共有13种,其中西藏新记录种2种,即厚边合叶苔(Scapania carinthiaca J.B. Jack)和东亚合叶苔(S. orientalis Steph. ex K. Müller);此外,还有色季拉山新记录种9种,分别为多胞合叶苔(S. apiculata Spruce)、刺边合叶苔(S. ciliata Sande Lac.)、短合叶苔[S. curta (Mart) Dumort.]、长尖合叶苔[S. glaucocephala (Taylor) Austin]、林地合叶苔[S. nemorea (L.) Grolle]、尼泊尔合叶苔(S. nepalensis Nees)、小合叶苔(S. parvifolia Warnst.)、弯瓣合叶苔(S. parvitexta Steph.)、粗疣合叶苔(S. verrucosa Heeg.)。同时,还对其中厚边合叶苔、东亚合叶苔和长尖合叶苔的形态特征和地理分布进行了描述,并提供了主要形态特征的照片。凭证标本存放于中国农业大学标本室(BAU)中。  相似文献   

10.
Essential oils of B. articulata, B. crispa, B. microcephala, Baccharis milleflora, B. myriocephala, B. stenocephala, B. trimera and B. usterii, all of sect. Caulopterae, have been analyzed by GC and GC/MS. Despite the morphological similarity among these species, differences in composition of their essential oil obtained by hydrodistillation and hexane extract could be observed. Special attention was given to Baccharis trimera and B. crispa since their differentiation during early stages is not possible due to the absence of synflorescences. Carquejyl acetate is suggested as a marker for Baccharis trimera, and a fast method of detection of this compound is given.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号