共查询到20条相似文献，搜索用时 671 毫秒
1.
2.
Eucheuma gelatinae (esper)J.Agardh has vegetative and reproductive features distinguishing it fromother species of Eucheuma.The occurrence of reproductive nemathecia containing carpogonial branches,auxiliary cells and post-fertilization stages including gonimoblast and pericarp initiation,fusion cell foram-tion stages and carposporophyte development are described and ilustrated for the first time for this species. 相似文献
3.
Wei Yin-xin 《中国海洋湖沼学报》1994,12(2):180-184
The morphology and reproduction cycles of a new species,Zygnemopsis hubeiensis Wei are described and illustrated for a culture homothallic strain collected from Wuhan, Hubei, China. The asexual reproduction
is by parthenospores, aplanospores and akinetes. The major events of the sexual cycle, including the genuflection of reproductive
cells, gametangial development, gamete formation, gamete fusion, zygote formation, zygospore development, and zygospore germination
are observed. 相似文献
4.
The energy budget ofBellamya earuginosa in a shallow algal lake, Houhu Lake (Wuhan, China) was investigated by the measurement of flesh production (32.8 kJ/(m2·a)), egestion (337.7 kJ/(m2·a)), metabolism (246.7 kJ/(m2·a)), and estimation of excretion (21.4kJ/(m2·a)). The net growth efficiency of the species is about 10.9%, which accords with the generally reported value for gastropods.
In addition, the relationships between starvation respiration (R, mgO2/(Ind·d)), body weight (Wd, mg in dry wt) and temperature (T, °C) were also determined. The regression equationR=0.044Wd
0.537
e
0.061T
was obtained by the least square method, The measured SDA of the species is 26.51% of its gross metabolism.
Project No. 3960019 and 39430101 supported by NSFC and also a granted for the East Lake Ecological Experimental Station, CAS,
Wuhan. 相似文献
5.
Three new species of Batrachospermum Roth (Batrachospermales, Rhodophyta) from China are described in this paper. B. yunnanense sp. nov. has long-cylindrical trichogynes with long stalks and is diagnostic of section Virescentia. Within this section, B. yunnanense is similar to B. helminthosum Bory emend. Sheath et al., but it is dioecious and has curved carpogonial branches, while the latter is monoecious and has straight carpogonial branches. It is also similar to B. transtaganum Reis, but it differs from the latter in long carpogonia,big carposporophytes and carposporangia. It is considered that B. nothocladoideum sp. nov. is assigned to section Contorta, subsection Kushiroense, because its carpogonial branches are twisted and gonimoblast filaments are loosely agglomerated. This new species similar to B. iriomotense Kumano, but with short fascicles, long-ovoid or subpyriform cells, numerous terminal hairs, long-ellipsoid trichogynes, big carposporophytes and small carposporangia. The plant is quite tough and cartilaginous and similar to Nothocladus in gross morphology, but its carposporophytes are compact instead of diffuse. This shows that it may be a transitional species between section Contorta and genus Nothocladus. So, B. transitorium sp. nov. should belong to section Contorta, subsection Kushiroense, because of its curved or twisted carpogonial branches and loosely agglomerated gonimoblast filaments, with globose or subglobose cells in fascicles similar to B. spermatiophorum Vis et Sheath, but no colourless spermatiophores. In terms of small and numerous carposporophytes, B. transitorium sp. nov. is similar to some species of section Batrachospermum. However, their other features are unique, indicating its transitional nature between section Contorta and Batrachospermum. 相似文献
6.
Zhang Zhinan 《中国海洋湖沼学报》1992,10(1):31-39
Two nematode species of the genusDorylaimopsis (Family Comesometidae) from the Bohai Sea are described.Dorylaimopsis rabalaisi n. sp. similar toD. punctata Ditlevsen, 1918 from which it can be separated by the small size, short and simple spicules without ventral apophyses or
joint line.Dorylaimopsis turneri n. sp. differs from the closest speciesDorylaimopsis angelae (Inglis, 1967) by its higher values of de Man ratio ‘a’, much shorter spicules and higher ratio of gubernacular to spicules
length. A key to species of the genus based on the key by Jensen (1979) is given.
This project was supported by the National Science Foundation, No: 3860804 相似文献
7.
This Mar. 1993 to Aug. 1994 study on suspended conchocelis ofPorphyra haitanensis showed that there were three patterns for development of vegetative filaments: filaments to filaments by “budding”; filaments
to sporangial branchlets by “budding”, or cell swelling. There were also three patterms for sporangial branchlet development:
vegetatively propagating, changing into conchospores, or dying. Each developmental stage had one or more different developmental
directions between vegetative filaments and sporangial branchlets. Developments from conchosporangial branchlets to conchospores
were sequential and irreversible. Although sporangial branchlets formed at 29°C could give rise to filaments, they could not
propagate as healthily under the same conditions as those formed at 25°C did. Probably the crucial period of plant cell differentiation
is in the late stage of sporangial branchlets. In line with the developmental directions of different stages, the authors
regulated the development of conchocelis to get ideal different developmental stages materials to obtain very developmentally
homogeneous stages, including filaments and sporangial branchlets.
Contribution No 3283 from the Institute of Oceanology, Chinese Academy of Sciences.
Study supported by the Climbing Project B PD-B6-4-2 of the State Science and Technology Commission of China. 相似文献
8.
Nie Pin 《中国海洋湖沼学报》1997,15(1):61-64
A new species ofProteocephalus from the fishSinocyclocheilus grahami tingi, a subspecies endemic to Fuxian Lake in Southwest China,is described. This is the first report of cestode from this host. The new species differs fromP. exiguus, P. Longicollis, P. parasiluri andP. torulosus, the only other species ofProteocephalus currently reported from China, by lacking an apical sucker, fromP. exiguus by having 45–108 rather than 24–54 testes per proglottis, and a maximum of 15 rather than 28 uterine diverticula; fromP.longicollis by having an average of 45–108 rather than 75–115 testes per proglottis and testes being in a single layer instead of 2 layers;
and fromP. torulosus by having 45–108 instead of 150 testes per proglottis and testes being in 3–4 layers; and fromP. parasiluri by having 45–108 rather than 180 testes per proglottis. It resemblesP. percae, P. pollanicola, andP. thymalli in number of testes and uterine diverticula, but differs by lacking an apical sucker.Proteocephalus thymalli, like the new species, has a vagina that opens dorsally to the cirrus sac, butP. thymalli slao has postovarian testes, which the new species lacks. The possible significance of parasitological examinations of the
other two subspecies ofS. grahami in two lakes close to Fuxian Lake is discussed in relation to host speciation and coevolution of the host-parasite system. 相似文献
9.
Randomly amplified polymorphic DNA (RAPD) technique was applied to assess the genetic variations and phylogenetic relationships
in 4 species ofPorphyra. The samples were collected from the coast of Canada, Vietnam, Zhoushan, Fujian and Qingdao in China. Amplifications with
20 primers were carried out under predetermined optimal reaction conditions (samples were first heated at 94°C for 5 min.
and followed by 45 cycles of 1 min at 94°C, 1 min at 36°C, and 2 min at 72°C, then held at 72°C for 10 min). The amplified
products were scored as present (1) or absent (0) for each DNA sample and an index of genetic similarity (F) was calculated
by using Nei & Li’s matching coefficient method (1979). The value of (1−F) was used to quantify the genetic distances between
species and construct a phylogenetic tree. The relationship indicated by the UPGMA and NJ cluster analysis on the values of
the genetic distance is in good overall agreement with classical taxonomy. The obvious differences between natural and cultivated
population ofP. haitanensi suggest that variation or hybridization with other species occurred during the culture.
Contribution No. 100 from the Experimental Marine Biology Laboratory, IOCAS.
Contribution No. 3289 from the Institute of Oceanology, Chinese Academy of Sciences.
The research supported by the Foundation of the Chinese Academy of Sciences. 相似文献
10.
The present paper reports 7 species of pontoniine shrimps collected from Hainan Island,South China Sea,by the Joint Chinese-German Marine Biology Expeditions,in which,Conchodytes nipponensis(De Haan,1844)and Coralliocaris brevirostris Borradaile,1898 are new records from Chinese waters. 相似文献
11.
Laminaria gametophyte was greatly influenced by light in its growth and development. Using light-emitting diodes (LED) as blue and
red light sources, we analyzed the light effect on gametophytes development ofLaminaria japonica Aresch. The gametophytes were obtained from zoospores collected in April, May, July, 2003 and September, 2004. We found that
the growth of gametophytes was stimulated by increasing intensity of blue light (BL) and red light (RL) illumination, of which
BL was obviously stronger than that of RL. The fertilization of gametophytes depended largely on BL, and only sufficient BL
illumination could take the reproductive effect. In addition, we noticed that there was a significant difference in light
responses for gametophytes developed from zoospore collected in different times. For zoospores released in April, under BL1 (73.90 μmol photons/m·s), the unicellular female gametophytes and multi-cellular male gametophytes produced eggs and sperms
respectively, and further developed towards sporophytes. However, for gametophytes developed in May, July or September, they
became multi-cellular and never formed oogonia or antheridia. It is believed that theLaminaria sporangium maturation stage could affect the gametophytes reaction to BL under laboratory culture conditions. Therefore,
cryptochrome- or phototropin-like BL photoreceptors is probably involved in BL-induced development ofLaminaria gametophytes.
This research was supported by the NSFC (No.40376049) and Japan Society for the Promotion of Science (The Invitation Fellowship
for Research in Japan 2002). 相似文献
12.
Zhang Cheng Han Xiaotian Zou Jingzhong Yu Zhiming Song Xiuxian Christian Schuett 《中国海洋湖沼学报》2005,23(3):317-322
A fragment of a large sub-unit ribosomal DNA (LrDNA) of 12 strains ofProrocentrum species was amplified by polymerase chain reaction (PCR). The PCR products were digested by 3 restriction endonucleases (Cfo
I, Hae III, and RSA I) and then resolved in agarose gels. Results show that different species had different RFLP patterns,
except forP. arcuatum (ME 131), which had the same pattern toP. micans (ME160 and 04). The same fragment of 19 strains of the genus was also amplified and subjected to denaturing gradient gel
electrophoresis (DGGE). 11 different patterns were resolved. Different cultures of a same species had the same pattern. The
results of RFLP and DGGE analyses showed that eight newly isolated epibenthicProrocentrum species were different from each other, and also from other cultured ones examined in this study.P arcuatum (ME132) could not be differentiated fromP. micans (ME160 and 04), it was probably mis-identified, since they are quite different morphologically.P. redfieldii (ME138) could also not be distinguished formP. triestinium (ME132), it should be regarded as a synonym ofP. triestinium. Unexpectedly, a restriction site was found inP. micans, compared with previous sequence data.
Project supported by National Basic Research Priorities Program (2001CB409701, 2001CB409710) and supported by NSFC (40376040,
40025614) 相似文献
13.
Fatty acid composition of fourSargassum species from Qingdao and Shidao, Shandong Province was investigated. 16:0 (palmitic acid) was the major saturated fatty acid.
C18 and C20 were the main polyunsaturated fatty acids (PUFAs). Arachidonic acid and eicosapentaenoic acid predominated among polyenoic
acids in all the algal species examined, except forSargassum sp. which had low concentration of eicosapentaenoic acid.
Contribution No. 2354 from the Institute of Oceanology, Chinese Academy of Sciences 相似文献
14.
Thirty-two 63.0–134.4 mm standard length specimens collected during 1954–1990 from the coastal waters of the South China Sea
and the continental coast of the Taiwan Strait were identified as a new species,Pampus minor Liuet Li, sp. nov.
Contribution No. 3329 from the Institute of Oceanology, Chinese Academy of Sciences.
Study supported by Chinese Academy of Sciences Special Grant for Biota Research. 相似文献
15.
Isabella A. Abbott 《中国海洋湖沼学报》1995,13(4):343-347
A new species ofLiagora, L. perennis sp. nov. from Hawai’i, is described. Unlike species of this genus in China, it is carpotetrasporangial, and at the place
of expected carposporangia bears cruciately divided tetrasporangia, a detail which differentiates it from the usual species
ofLiagora without tetraspores that have been reported in China. Notes are provided on otherLiagora species that have an impact on the taxonomy of species found in China.
Dedicated to the memory of Zhang Junfu(C. F. Chang) whose studies on marine algae I respect highly, and whose good-humored
friendship I treasure. 相似文献
16.
Population, seasonal abundance of the mysidIndomysis annandalei Tattersal (1914) from Karachi waters (northern Arabian Sea) are studied. Occurrence of breeding females is noted and developmental
stages are described. 相似文献
17.
Paracalanus parvus,Paracalanus crassirostris,and Acartia bifilosa are dominant and widely distributed in the Bohai Sea,and comprise an important part of zooplankton in terms of biomass as well as production rate.In order to understand their seasonal distribution and population dynamics,their stage-specific abundance in different months of the year were analyzed based on the never analyzed yet samples collected in 1959.The three species showed clear and remarkable seasonal variation in abundance,which maximized in spring and summer,when they formed high biomass patches or concentrations in the nearshore area.For Paracalanus parvus,two peaks were observed in the annual circle,one in June and the other in September,For Paracalanus crassirostris,one peak occurred in summer and a small one in December.The seasonal pattern of Acartia bifilosa was different in different regions.In Bohai Bay it had a two-peak pattern,with the first large peak occurring in May and the second one in October.In Laizhou Bay,a winter peak in December and January could be observed besides the spring one.The number of generations during the reproductive season for the three species was estimated based on the annual cycle in abundance and ambient temperature. 相似文献
18.
Cloning and Analysis of Calmodulin Gene from Porphyra yezoensis Ueda （Bangiales, Rhodophyta） 总被引：2，自引：0，他引：2
In order to understand the mechanisms of signal transduction and anti-desiccation mechanisms of Porphyra yezoensis, cDNA and its genomic sequence of Calmodulin gene (CaM) was cloned by the technique of polymerase chain reaction (PCR) based
on the analysis of P. yezoensis ESTs from dbEST database. The result shows that the full-length cDNA of CaM consists of 603 bps including an ORF encoding
for 151 amino acids and a terminate codon UGA, while the length of genomic sequence is 1231 bps including 2 exons and 1 intron.
The average GC content of the coding region is 58.77%, while the GC content of the third position of this gene is as high
as 82.23%. Four Ca2+ binding sites (EF-hand) are found in this gene. The predicted molecular mass of the deduced peptide is 16688.72 Da and the
pI is 4.222. By aligning with known CaM genes, the similarity of CaM gene sequence with homologous genes in Chlamydomonas incerta and Chlamydomonas reinhardtii is 72.7% and 72.2% respectively, and the similarity of the deduced amino acid sequence of CaM gene with homologous genes
in C. incerta and C. reinhardtii are both 71.5%. This is the first report on CaM from a species of Rhodophyta. 相似文献
19.
The 5.8S ribosomal DNA sequences (5.8S rDNA) and their flanking regions, internal transcribed spacer 1 and spacer 2 (ITS1
and ITS2) of three new isolates in genus Alexandrium (Alexandrium sp. qd1, Alexandrium sp. qd2, Alexandrium sp. gz) from China were amplified, sequenced, and subjected to phylogenetic analysis. Alexandrium sp. gz and Alexandrium sp. qd1 were grouped with high bootstrap values with four strains/species, i.e., A. catenella South Korea strain, A. catenella Japan strain, and two from China, Alexandrium sp. AC03 and Alexandrium sp. AN01 being proposed to be A. catenalla in a previous study. Then Alexandrium sp. gz and Alexandrium sp. qd1 were identified as Alexandrium catenella. As A. catenella was isolated from Qingdao and Guangzhou sea areas, it supposedly distributed at least in these two areas and was genetically
different. Alexandrium sp. qd2 differed greatly from species in Alexandrium. It clustered with Symbiodinium californium, Symbiodinium sp. G15 and Gymnodinium sp. Zhao 01 with 100% bootstrap value; so Alexandrium sp. qd2 affiliates to genus Symbiodinium, and is probably a free-living Symbiodinium species. 相似文献
20.
The energy flow ofBranchiura sowerbyi was studied for the first time in China in a shallow macrophytic lake, Biandantang Lake, Hubei Province. The energy flow
was calculated from the measurement of flesh production (12.5241kJ/m2a), egestion (517.7302kJ/m2a), metabolism (38.3273 kJ/m2a), and excretion (4.3798kJ/m2a). The net growth efficiency of the species is about 22.7%, which accords well with the generally reported value for oligochaetes.
In addition, the relationship between starvation respiration (R, mgO2/ind·d), wet weight (Ww, mg) and temperature (T, °C) were also measured, with the regression function beingR=0.008Ww0.736 e0.050T.
Project supported by NSFC (30270278, 3960019), the foundation of the government of Hubei Province (No. 2000J109), and the
foundation of Ecological Station, CAS in the Institute of Hydrobiology. 相似文献