Mar 2008, Volume 3 Issue 1
    

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  • Neutral theory in community ecology
    ZHOU Shurong, ZHANG Dayong
    2008, 3(1): 1-8. https://doi.org/10.1007/s11515-008-0008-z
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    One of the central goals of community ecology is to understand the forces that maintain species diversity within communities. The traditional niche-assembly theory asserts that species live together in a community only when they differ from one another in resource uses. But this theory has some difficulties in explaining the diversity often observed in specie-rich communities such as tropical forests. As an alternative to the niche theory, Hubbell and other ecologists introduced a neutral model. Hubbell argues that the number of species in a community is controlled by species extinction and immigration or speciation of new species. Assuming that all individuals of all species in a trophically similar community are ecologically equivalent, Hubbell’s neutral theory predicts two important statistical distributions. One is the asymptotic log-series distribution for the metacommunities under point mutation speciation, and the other is the zero-sum multinomial distribution for both local communities under dispersal limitation and metacommunities under random fission speciation. Unlike the niche-assembly theory, the neutral theory takes similarity in species and individuals as a starting point for investigating species diversity. Based on the fundamental processes of birth, death, dispersal and speciation, the neutral theory provided the first mechanistic explanation of species abundance distribution commonly observed in natural communities. Since the publication of the neutral theory, there has been much discussion about it, pro and con. In this paper, we summarize recent progress in the assumption, prediction and speciation mode of the neutral theory, including progress in the theory itself, tests about the assumption of the theory, prediction and speciation mode at the metacommunity level. We also suggest that the most important task in the future is to bridge the niche-assembly theory and the neutral theory, and to add species differences to the neutral theory and more stochasticity to the niche theory.
  • Molecular genetic analysis of Dongzhou-period ancient human of Helingeer in Inner Mongolia, China
    FU Yuqin, XIE Chengzhi, CUI Yinqiu, ZHOU Hui, ZHAO Han, XU Xuelian, ZHU Hong, ZHANG Quanchao
    2008, 3(1): 9-12. https://doi.org/10.1007/s11515-008-0019-9
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    The mtDNA hypervariable region I (HVR-I) of 10 ancient individuals from Dongzhou-period ancient human populations in Helingeer county of Inner Mongolia were amplified and sequenced to investigate the genetic structure. The relationships between the ancient population and related extant populations, as well as its possible origin at the molecular level, were also studied. Moreover, phylogenetic analysis and multidimensional scaling analysis were also performed based on the mtDNA data of the ancient population in Helingeer and the related Eurasian population. The results showed that the ancient population in Helingeer were closer to the northern Asian populations than to the other compared populations in matrilineal lineage. Combining the research results of archaeology and anthropology as well as molecular biology, we inferred that they were nomads who migrated from Mongolia plateau and cis-Baikal region to Helingeer in Inner Mongolia, China.
  • Subcellular localization of PS1 based on PS1/GFP fusing protein
    LI Tie, NING Lifeng, SANG Jianli, LI Jiahui
    2008, 3(1): 13-18. https://doi.org/10.1007/s11515-008-0016-z
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    Mutations in presenilin 1 (PS1) gene are closely associated with the early onset of familial Alzheimer’s disease (EOFAD). The fusion genes, GFP-PS1 (recombinant plasmid pEGFP-C1-PS1) and PS1-GFP (recombinant plasmid pEGFP-N2-PS1) were constructed to study the subcellular localization of PS1 holoprotein. Recombinant plasmids were transiently transfected into two cell lines, HEK293 and CHO, respectively, using the green fluorescence from GFP (green fluorescence protein) as the PS1 localization signal. Then, we observed green fluorescence with a SPOT II (Olympus, BH2) and CONFOCAL microscope (Olympus, FV300) under 488 nm. The results show that PS1 located on the nuclear envelope. A few can be found on the cellular membrane and in the cytosol in a non-homogeneous distribution.
  • Cloning and expression of the gene encoding (R)-specific carbonyl reductase from CCTCC M203011
    XU Na, WANG Haiyan, NIE Yao, XU Yan, XIAO Rong
    2008, 3(1): 19-25. https://doi.org/10.1007/s11515-008-0014-1
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    The gene which encodes (R)-specific carbonyl reductase (rCR) from Candida parapsilosis CCTCC M203011 was cloned, sequenced and compared with genes from the GenBank. The results indicated that rCR gene was 1011 bp, encoding a protein of 336 amino acids with a molecular weight of 35.9 kDa, and its nucleotide sequence showed 99% similarity to those of other members of the alcohol dehydrogenase superfamily. The rCR gene could express in recombinant strain Escherichia coli JM109, and the expression plasmid could produce (R)-1-pheny-1,2-ethanediol (100% e.e., 80.14% yield) from ?-hydroxyacetophenone without any additive to regenerate NAD+ from NADH.
  • Heterologous expression and characterization of gene from in
    QIAO Yu, CHEN Xiaobing, DING Hongbiao, YUE Ming
    2008, 3(1): 26-31. https://doi.org/10.1007/s11515-008-0002-5
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    ?-Mannanase catalyzes endo-wise hydrolysis of the backbone of mannan and heteromannan, which are abundant in the cell wall structure of ungerminated leguminous seeds. The mature ?-mannanase originated from Bacillus subtilis was expressed in Pichia pastoris, a methylotrophic yeast, using the leader peptide sequence of Saccharomyces cerevisiae ?-factor. The cultivation of ?-mannanase expressing Pichia pastoris yields up to 1.8 g/L protein. In the supernatant the activity of the 40 kDa-total mannanase attained a level of 1102.0 IU/mL. The properties of the ?-mannanase were characterized. Optimum pH and temperature for the recombinant enzyme were 5.5 and 50°C respectively. The enzyme was stable at pH 5.0–10.0 and maintained over 30% original activity after incubating at 70°C for 30 min.
  • Chlorophytes of biological soil crusts in Gurbantunggut Desert, Xinjiang Autonomous Region, China
    ZHAO Jiancheng, ZHANG Bingchang, ZHANG Yuanming
    2008, 3(1): 40-44. https://doi.org/10.1007/s11515-008-0007-0
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    In this paper, chlorophytes collected from 253 biological soil crust samples in Gurbantunggut Desert in Xinjiang Autonomous Region, China were studied by field investigation and microscopical observation in lab. The flora composition, ecological distribution of chlorophytes in the desert and dynamic changes of species composition of chlorophytes in different developing stages of biological soil crusts are preliminarily analyzed. Results showed that there were 26 species belonging to 14 genera and 10 families, in which unicellular chlorophytes were dominant. There existed some differences in distribution of varied sand dune positions. The taxa of chlorophytes in leeward of sand dunes are most abundant, but the taxa in windward, interdune and the top of sand dunes reduced gradually. Chlorophytes were mainly distributed within the crust and the taxa of chlorophytes decrease obviously under the crust. In the developing stages of the biological soil crust, species diversity of chlorophytes changed a little, but species composition presented some differences. Chlorococcum humicola, Chlorella vulgaris, Chlamydomonas ovalis and Chlamydomonas sp. nearly existed in all developing stages of biological crusts. In several former stages of the biological soil crust there were spherical chlorophytes and filamentous ones. When moss crust formed, filamentous chlorophytes disappeared, such as Microspora and Ulothrix.
  • Study on successions sequence of evergreen broad-leaved forest in Gutian Mountain of Zhejiang, Eastern China: species diversity
    HU Zhenghua, YU Mingjian
    2008, 3(1): 45-49. https://doi.org/10.1007/s11515-008-0011-4
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    Using the widely adopted scheme of space-for-time substitution for investigating 16 typical plots distributed as a pattern of contiguous grid quadrates within a sampling plot, the expressions of Shannon-Wiener index (H) for species diversity, Pielou index (Jsw, JSI) for evenness and Simpson index (D) for ecological dominance are employed to investigate the species diversity (SD) of four evergreen broadleaved communities in the successions sequence within the Nature Reserve of the Gutian Mountains. Results showed that in the successions process from the coniferous to the mixed coniferous-broadleaved, then to Schima superba and finally to Castanopsis eyrei forest, the arbor layer SD showed the Shannon-Wiener index (H) as 1.9670, 2.4975, 2.6140 and 2.4356, respectively, characterized by their rise before drop and the shrub (herb) layer SD shows the maximum to be in the mixed coniferous-broadleaved (coniferous) forest (H arriving at 2.8625 (1.5334)). In the vertical structure, on the other hand, for the sequenced coniferous forest, coniferous-broad mixed forest and Castnaopsis eyrei forest, the number of SD ranges in a decreasing order from the shrub, arbor to herb layer in contrast to the SD in a decreasing order of Schima superba forest ranging from the arbor to shrub and then to herb layer, and during the succession, the herb layer exhibits the maximum range of SD change among these layers, with its variation coefficients of 0.1572, 0.0806, 0.0899 and 0.1884 for H, JSW, JSI and D, in order, in sharp contrast to the minimal SD range in the shrub layer, with the corresponding figures of 0.0482, 0.0385, 0.0142, and 0.1553.
  • Effects of heavy metals Cd, Pb and Zn on DNA damage of loach
    ZHANG Yingmei, WANG Yejing, YU Runliu, ZHANG Sheng, WU Zhenbin
    2008, 3(1): 50-54. https://doi.org/10.1007/s11515-008-0012-3
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    The effects of heavy metals Cd2+, Pb2+ and Zn2+ at 0.05, 0.5 and 5.0 mg/L level and their interactions at 0.5 mg/L level on DNA damage in hepatopancreas of loach Misgurnus anguillicaudatus for 1–35 days exposure were examined by single cell gel electrophoresis (SCGE). For each test group, 20 loaches with similar body size (5.17–7.99 g; 11.79–13.21 cm) were selected and kept in aquaria with dechlori-nated water at (22 ± 1)°C and fed a commercial diet every 48 h. According to the percentage of damaged DNA with tail and its TL/D (tail length to diameter of nucleus) value, the relationship between DNA damage degree and heavy metal dose and exposure time was determined. Results showed that the percentage of damaged DNA and the TL/D value were increased with the prolonged exposure time. The highest percentage (84.85%) of damaged DNA was shown in 5.0 mg/L Zn2+ group after 28 days exposure and the biggest TL/D value (2.50) in all treated groups after 35 days exposure. During the first treated week, the damnification of DNA was mainly recognized as the first level, after that time, the third damaged level was mostly observed and the percentage of damaged DNA was beyond 80%. The joint toxic effects among Cd2+, Pb2+ or Zn2+ revealed much complexity, but it generally displayed that the presence of Cd2+ could enhance the genotoxicity of Pb2+ or Zn2+. In conclusion, the results suggested that there was a significant time- and dose-depended relationship between the heavy metal and DNA damage in hepatopancreas of loach, and SCGE could represent a useful means to evaluate the genotoxicity of environmental contamination on aquatic organisms.
  • Sequence variability analysis on major histocompatibility complex class II DRB alleles in three felines
    WANG Qian, WU Xiaobing, YAN Peng, ZHENG Shuai
    2008, 3(1): 55-62. https://doi.org/10.1007/s11515-008-0004-3
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    The variation of the exon 2 of the major histocompatibility complex (MHC) class II gene DRB locus in three feline species were examined on clouded leopard (Neofelis nebulosa), leopard (Panthera pardus) and Amur tiger (Panthera tigris altaica). A pair of degenerated primers was used to amplify DRB locus covering almost the whole exon 2. Exon 2 encodes the ?1 domain which is the most variable fragments of the MHC class II molecule. Single-strand conformational polymorphism (SSCP) analysis was applied to detect different MHC class II DRB haplotypes. Fifteen recombinant plasmids for each individual were screened out, isolated, purified and sequenced finally. Totally eight distinct haplotypes of exon 2 were obtained in four individuals. Within 237 bp nucleotide sequences from four samples, 30 variable positions were found, and 21 putative peptide-binding positions were disclosed in 79 amino acid residues. The ratio of nonsynonymous substitutions (dN) was much higher than that of synonymous substitutions (dS), which indicated that balancing selection probably maintain the variation of exon 2. MEGA neighbor joining (NJ) and PAUP maximum parsimony (MP) methods were used to reconstruct phylogenetic trees among species, respectively. Results displayed a more close relationship between leopard and tiger; however, clouded leopard has a comparatively distant relationship form the other two.
  • Effects of vegetation coverage on the spatial distribution of soil nematode trophic groups
    HUA Jianfeng, JIANG Yong, LIANG Wenju
    2008, 3(1): 63-67. https://doi.org/10.1007/s11515-008-0001-6
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    The spatial variability of total soil nematodes and trophic groups in bare and fallow plots in Shenyang Experimental Station of Ecology, Chinese Academy of Sciences was examined using geostatistics combined with classic statistics. Results showed that the soil pH value had a negative effect on plant-parasites in both bare and fallow plots; the mean number of total nematodes was significantly higher in fallow plots than in bare plots, which was 1485.3 and 464.0 individuals per 100 g dry soil in fallow and bare plots, respectively; the nugget (C0)/sill (C0 + C) ratio of total nematodes, plant-parasites and bacterivores were lower in fallow plots (27.3%–45.6%) than in bare plots (49.5%–100%); the spatial distribution of total nematodes and trophic groups was found to be different between fallow and bare plots, which indicated that vegetation coverage had an effect on soil nematodes.
  • Potential effects of elevated carbon dioxide on leaf-feeding forest insects
    WANG Xiaowei, LIU Yan, JI Lanzhu, WANG Guiqing
    2008, 3(1): 68-77. https://doi.org/10.1007/s11515-008-0023-0
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    The elevated concentration of atmospheric CO2 may result in a decline of leaf nutritional quality (especially N) and an increase in some kinds of defensive secondary components (such as phenolics). The changes in the phytochemistry of trees, combined with the effect of elevated CO2 per se, have a potential negative influence on insect herbivores. Here, we review the effect of elevated CO2 on the performance of leaf-feeding forest insects at individual-level and community-level. The elevated CO2 per se have little influence on the metabolism of insects. Over half of the tree-insect experimental systems show that the performance of individual insect become poorer under high-CO2 grown trees; but the others show that the insects have just little or no response to the treatments. The direction and magnitude of the changes in the performance of insects could be mediated by various factors. The effects of treatment are strongly species-dependent. The magnitude of changes in the phytochemistry, the sensitivity and adaptive capacity of insects to the poorer leaf quality, the differences in plant growth conditions and experimental methods, and the mediated effects of other environmental factors (such as soil nutrient availability, light, temperature, O3) were all closely related to the final performance of insects. However, the larvae’s consumption usually increased under enriched CO2 treatment, which was widely thought to be a compensatory response to poorer plant quality. The experiments on forest community-level found identically a reduction in herbivory, which was contrary to the results from small-scale experiments. The changes in insect population and the actual response of consumption by leaf-feeding forest insects under CO2 enrichment remain unclear, and more field-based experiments need to be conducted.
  • Selectivity mechanism of on four different species of maples
    ZHANG Fengjuan, JIN Youju, CHEN Huajun, WU Xiaoying
    2008, 3(1): 78-84. https://doi.org/10.1007/s11515-008-0006-1
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    Anoplophora glabripennis (Motsch.) is a wood-boring beetle that is native to China. For a long time, it caused great losses in the economy and ecology of northwest China. Attractants are often used to control insects. The volatiles emitted from the host plant play an important role for insects in finding their target. To explore the mechanism of selectivity to different host plants, the response of Anoplophora glabripennis to four different host plants was investigated, which included Acer negundo L., Acer mono Maxim., Acer truncatum Bunge. and Acer platanoides L., and the compounds in the profiles of volatiles were identified from these species. The olfactory responses of Anoplophora glabripennis to the odors of different plants showed preference for certain host plants: Acer negundo, Acer mono and Acer truncatum. The attraction of Acer negundo and Acer mono was significantly different (p < 0.05). The attraction of Acer negundo to the insects was stronger than to Acer mono. Acer platanoides neither attracted nor repelled the insects. Compounds in the profiles of volatiles from the above four species were identified and quantified by gas chromatography-mass spectrometry (GC-MS) equipped with a CP-4020 termodesorption and cold trap (TCT) device. The constituents of volatiles and the relative concentrations were different in the four host species. The amount of ketones, alcohols and aldehydes in the four plants showed the same order: Acer negundo < Acer mono < Acer truncatum < Acer platanoides, while that of alkanes and esters was quiet different: Acer negundo L. > Acer mono Maxim. > Acer truncatum Bunge. > Acer platanoides L.. 1-penten-3-ol, ocimene and trans-Germanylacetone were repellent to Anoplophora glabripennis. 1-penten-3-ol and trans-gerranylacetone were identified in Acer platanoides, and Ocimene was the most attractive to Anoplophora glabripennis among these species. The extent of feeding damage caused by Anoplophora glabripennis differed among four species. The sequences was Acer negundo > Acer mono > Acer truncatum > Acer platanoides. The epidermal hairs of the four host plants revealed that the extent of damage was related to the physical characteristics of the host plants.
  • Role of magpie in bird community formation in secondary forest
    DENG Qiuxiang, GAO Wei, ZHOU Tong, YANG Yanlong
    2008, 3(1): 85-88. https://doi.org/10.1007/s11515-008-0013-2
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    We analyzed a bird community in a secondary forest and the results show that the magpie was one of the key groups in the secondary forest. The key group is identified based on the nests used by other birds at a rate of 25%–40.17%. The size of the community is different and the number of these key groups is not certain.
  • Fluctuations and patterns of desert rodent communities under human disturbance: fluctuating tendency and sensitive response of their population
    WU Xiaodong, FU Heping
    2008, 3(1): 89-100. https://doi.org/10.1007/s11515-008-0010-5
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    The four kinds of sites under different kinds of human disturbances, i.e. a farmland area, a rotational-grazing area, an over-grazing area and a prohibited-grazing area, were selected in the typical region of the Alashan Desert of Inner Mongolia from April to October in 2002, 2003 and 2004 respectively. The fluctuating tendency of rodent communities and the sensitive response of their populations were studied using mark-recapture and trap-day methods. The four kinds of mark-recapture samples and line samples were taken in different human disturbance areas. The area of the mark-recapturing sample was 0.95 hm2 and that of the line sample was 10 km2. The samples were collected every month in the mark-recapturing sites for four consecutive days and in line sites in April, July and October every year. The variable matrix was composed of the numbers of captured rodents of the rodent communities. The sensitive response of the populations in the communities was analyzed with principal component analysis (PCA). Results showed that there were different types of rodent communities under different kinds of human disturbance on two scales in three years. In each scale, there were large differences in both the number of species and the number of main population in the rodent communities under different kinds of human disturbance on the farmland area and over-grazing area especially. The results of PCA showed that the sensitive response of the populations of the commu nities was significantly different under different kinds of human disturbance on the two scales in the three years. Cricetulus barabensis was the most sensitive on the farmland area, there were no differences in sensitive response of the various rodents on the rotational-grazing area, and Dipus sagitta and Phodopus roborovskii were the most sensitive in the over-grazing area.
  • A preliminary study on designing ecological corridors in Xishuangbanna National Nature Reserve with 3S techniques
    LIN Liu, ZHANG Li, FENG Limin, GUO Xianming, ZHAO Jianwei, DAO Jianhong
    2008, 3(1): 101-105. https://doi.org/10.1007/s11515-008-0003-4
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    This paper is based on the fieldwork in Xishuangbanna Natioanl Nature Reserve in Yunnan Province of China. GPS data of Asian elephants were collected and analyzed with the remote sensing satellite photos of the region to estimate the landform physiognomy of different colors. We also analyzed a series of ecological factors including altitude, landform, relief, villages and roads which affected the distribution and movement of Asian elephants. The results suggested the possibility of designing and establishing corridors in Xishuangbanna National Nature Reserve to protect the population of wild elephants in the region.
  • Phosphatized rare star-like mouth disc of and its functional morphology from the earliest Cambrian of the South Shaanxi China
    LIU Yunhuan, LI Yong, SHAO Tiequan, ZHANG Wanqian, WANG Zhuo, YANG Weixian, LI Rongxi, ZHU Zhixin
    2008, 3(1): 106-112. https://doi.org/10.1007/s11515-008-0005-2
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    The Meishucun stage is the prelude in deciphering the Cambrian Explosion. In this prominent stage, rapid radioactive evolution and body-plan innovation have taken place and different associations of organism have been shaped. In this paper we report several 3D-preserved rare star-like fossils with finely preserved soft tissues which were recovered from the Kuanchuanpu Member of the Dengying Formation in South Shaanxi, China in 2003. By studying on functional morphology and analogy with mouthpart of Punctatus, there are evidences that this star-like organism approaches the coelenterates in systematic classification and the centre of star-like organism is its mouth. The appearance of coelenterates marks the real beginning of metazoan evolution. Therefore, it has the prominent position in the origin and evolutionary history of organisms. Perhaps the star-like organism represents the early types of coelenterate with original tentacles. These new materials provide new evidence for the origin, evolution and the functional evolution of the metazoan during the early stage of the Cambrian Explosion.
  • Macroalgal holdfasts and their interaction with environments from the Neoproterozoic Doushantuo Formation in Guizhou, South China
    WANG Yue, WANG Xunlian
    2008, 3(1): 113-122. https://doi.org/10.1007/s11515-008-0009-y
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    Numerous macro-organisms of the Doushantuo macrobiota, which were found in the black carbonaceous mudstone of the upper Neoproterozoic Ediacraan Doushantuo Formation in Jiangkou County, Guizhou Province, China, are considered to live on sea floor by their holdfasts. The appearance and preserved forms of the macroalgal holdfasts may provide some data to the study of the living and buried environments of macrobiota. They lived in the lower energy and clear environment, and fixed on a soupground with rich water (about 79% water). Currents, possibly ocean currents, could pull out the macroalgal holdfasts from the soupground and break off the macroalgal foliations. After such events, the corpses of macro-organisms would be covered in a reduced environment by the deposits. Afterwards, a new community, including regenerating and undying macro-organisms, lived continuously on a new deposit.