Multilocation trials are often used to analyse the adaptability of genotypes in different environments and to find for each environment the genotype that is best adapted; i.e. that is highest yielding in that environment. For this purpose, it is of interest to obtain a reliable estimate of the mean yield of a cultivar in a given environment. This article compares two different statistical estimation procedures for this task: the Additive Main Effects and Multiplicative Interaction (AMMI) analysis and Best Linear Unbiased Prediction (BLUP). A modification of a cross validation procedure commonly used with AMMI is suggested for trials that are laid out as a randomized complete block design. The use of these procedure is exemplified using five faba bean datasets from German registration trails. BLUP was found to outperform AMMI in four of five faba bean datasets. 相似文献
In order to study the differentiation of Asian colobines, fourteen variables were analysed in one way, on 123 skulls, includingRhinopithecus, Presbytis, Presbytiscus, Pygathrix, andNasalis with both cluster and differentiated functions tests. Information on paleoenvironment changes in China and South-East Asia
since late Tertiary have been used to examine the influences of migratory habits and the distribution range in Asian colobines.
The cladogram among different Asian colobines genera was made from the results of various analysis. Some new points or revisions
were suggested: 1. Following the second migratory way, ancient species of Asian colobines perhaps passed through Xizang along
the northern bank of Tethis sea and Heng-Duan Shan regions, across Yunnan into Vietnam, since the ancient continent between
Yunnan and Xizang was already located in on eastern bank of Tethis sea. Thus, during the evolution, Asian colobines must have
had two original centres, i.e. “Sundaland” and Heng-Duan Shan Chinese regions; 2. Pygatrix possesses a lot of cranial features
more similar toPresbytiscus than toRhinopithecus. The small difference from the modification combinesPygatrix with other two genera as shown by Groves (1970), but it is better to putPygatrix andPresbytiscus together as one genus; 3.Nasalis (2n=48) may be the most primitive genus within Asian colobines. Some features shared withRhinopithecus, for example body size, terrestrial activities, limb proportion etc. ...seem to be considered as a common inheritance of
symlesiomorphus characters; 4.Rhinopithecus, with reference to cranioface and cranium or to its origin, is a special genus of Asian colobine. It may represent the highest
level of evolutionary position within various genera (Peng et al., 1985). 相似文献
Macroinvertebrate communities sampled by a corer, plankton net and sweep net from five wetlands on the Swan Coastal Plain
were compared. The composition of the fauna collected in sweeps and tows was generally similar and differed from that collected
in the cores. Cores caught fewer species than tows and sweeps at all wetlands and did not capture fast swimming hemipterans
or less abundant taxa. The highest species richness was recorded in sweep samples in four out of the five wetlands. Classification
(TWIN-SPAN) and ordination (SSH) of the samples collected in sweeps and tows gave good separation of the wetlands, whereas
classification of core samples did not. Coring appeared to be the least suitable sampling method for describing the major
components of the macroinvertebrate communities of these wetlands. Plankton tows were useful if the time available for sorting
was limited as these samples were free of sediments and generally gave similar results to those obtained with sweeps. Sweeps
appeared to be the most useful method for a large classification study as they collected more species and resulted in the
best discrimination amongst wetlands. 相似文献
1. 1. The writers present the general theory of evaluation that is being developed by their group.
2. 2. The evaluation of a human environment is a complex mental process.
3. 3. In an effort to express numerically the quality of an environment, one tends to oversimplify the complex aspects of it and the entailing problems in relation to its inhabitants.
4. 4. In this paper, some examples are taken in the evaluation of thermal environments, wherein much has been said and done in setting up numerical scales to express human comfort, and yet neither clear-cut explanations nor convincing logic seem to exist to terminate the argument over the widely scattered and sometimes seemingly contradicting experimental data.
5. 5. The writers suggest that many of the reasons for this confusion may be traced back to the oversimplified notion of evaluation.
6. 6. It is shown that there are various possibilities when looking at the scales of evaluation.
7. 7.|The nominal scale, least studied of all the four traditional scales, may be given a prominent place in evaluating a thermal environment. The pseudo-interval order scale is another example.
Author Keywords: evaluation; scales; thermal environment; classification; pseudo-interval order 相似文献
ABSTRACT. The recently established protozoan phylum Opalozoa Cavalier-Smith 1991 includes all those zooflagellates with tubular mitochondrial cristae that never have cortical alveoli or rigid tubular ciliary hairs (retronemes), and also the opalinids, proteomyxids sensu stricto, and plasmodiophorids. Opalozoa totally lack plastids but usually (though not invariably) have peroxisomes. They always have well-developed Golgi dictyosomes. The trophic phase is a unicellular ciliated phagotroph except in the only intracellular parasites, the plasmodiophorids, where it is a non-phagotrophic and non-ciliated microplasmodium, and in the proteomyxids where it is an amoeboflagellate (which may sometimes be nonciliated) or a multicellular meroplasmodium. Unlike the phagotrophic Mycetozoa, opalozoans do not form aerial fruiting bodies, but encystation is common. The first detailed classification of the phylum is presented here. It is divided into four subphyla (three new), eight classes (four new, one emended), three subclasses (all new), three superorders (all new) and 22 orders of which 12 are new and one is emended. Diagnoses of these taxa are given, as well as lists of the 31 families (11 new) and 62 genera included within them. Opalozoa, which include Cercomonas and Heterornita , the commonest soil flagellates, are ecologically and evolutionarily important. 相似文献