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1.
Yoshinari Tanaka 《Theoretical Ecology》2012,5(1):83-98
The response of ecological communities to environmental disturbances depends not just on the number of species they contain
but also on the functional diversity of the constituent species; greater variation in the tolerance of species to different
environmental disturbances is generally thought to confer greater resistance to the community. Here, I investigate how the
functional diversity of communities changes with environmental disturbances. Specifically, I assume that there is variation
in traits among species that confer tolerance or sensitivity to environmental disturbances. When a disturbance occurs, variation
in species tolerances causes changes in the relative abundances of species, which in turn changes the average tolerance of
the community. For example, if tolerance to an environmental disturbance is conferred by large body size, then the environmental
disturbance should be expected to increase the average body size of individuals in the community. Despite this expectation,
ecological interactions among species can affect the average community response. For example, if larger species are also strong
competitors with each other, then this might reduce the increase in average body size in the community, because interspecific
competition limits the grow in population density of large bodied species. Similarly, when disturbances affect multiple traits,
the covariance in the distribution of trait values among species may restrict the response of any one trait; if two traits
provide tolerance to the same disturbance but negatively covary among species, then the response of one trait will limit the
response of the other trait at the community level. Using a Lotka–Volterra model for competitive communities, I derive general
formulae that generate explicit predictions about the changes in average trait values in a community subject to environmental
disturbances. These formulae demonstrate that competition can impede the change in average community trait values. However,
the impediment is not considerable in comparison to the predominant factors of trait variances and species selection effects
when species with the most similar trait values also experience the greatest interspecific competition. Similarly, negative
covariances among different traits that confer resistance to the same environmental disturbance will impede their responses.
I illustrate these results using phytoplankton data from a whole-lake experiment in which manipulation to the zooplankton
community created a disturbance to the phytoplankton that changed the selective consumption of large vs. small phytoplankton. 相似文献
2.
Jennifer R. Mandel 《Conservation Genetics》2010,11(5):2055-2059
Knowledge of population size is an important step for identifying populations of immediate conservation concern. However,
this task is difficult in plant species that exhibit clonal growth, since a simple “head count” may not be appropriate. Here,
I determine the genetic population size and the extent of clonality in the four known populations of a rare sunflower, Helianthus verticillatus. Previous work in this species revealed high genetic diversity in all populations but significant fitness differences among
them. In this study, populations exhibited high clonal diversity but consisted of far fewer genetic individuals than previously
reported. Moreover, the clonal structure of populations was clumped, such that genotypes were highly clustered, which may
promote selfing among genets. The results of this study are related to previously examined levels of genetic diversity and
fitness, and findings are discussed in the context of the ecological and biological dynamics in clonal plant populations.
Finally, the results of this study led to an upgrade in the priority status of this species for the Endangered Species List. 相似文献
3.
Elena Litchman 《Oecologia》1998,117(1-2):247-257
Light is a major resource in aquatic ecosystems and has a complex pattern of spatio-temporal variability, yet the effects
of dynamic light regimes on communities of phytoplankton are largely unexplored. I examined whether and how fluctuating light
supply affects the structure and dynamics of phytoplankton communities. The effect of light fluctuations was tested at two
average irradiances: low, 25 μmol quanta m−2 s−1 and high, 100 μmol quanta m−2 s−1 in 2- and 18-species communities of freshwater phytoplankton. Species diversity, and abundances of individual species and
higher taxa, depended significantly on both the absolute level and the degree of variability in light supply, while total
density, total biomass, and species richness responded only to light level. In the two-species assemblage, fluctuations increased
diversity at both low and high average irradiances and in the multispecies community fluctuations increased diversity at high
irradiance but decreased diversity at low average irradiance. Species richness was higher under low average irradiance and
was not affected by the presence or absence of fluctuations. Diatom abundance was increased by fluctuations, especially at
low average irradiance, where they became the dominant group, while cyanobacteria and green algae dominated low constant light
and all high light treatments. Within each taxonomic group, however, there was no uniform pattern in species responses to
light fluctuations: both the magnitude and direction of response were species-specific. The temporal regime of light supply
had a significant effect on the growth rates of individual species grown in monocultures. Species responses to the regime
of light supply in monocultures qualitatively agreed with their abundances in the community experiments. The results indicate
that the temporal regime of light supply may influence structure of phytoplankton communities by differentially affecting
growth rates and mediating species competition.
Received: 24 September 1997 / Accepted: 8 July 1998 相似文献
4.
Lonnie W. Aarssen 《Evolutionary ecology》2008,22(3):279-298
Most of the resident plants within vegetation fail to leave descendants because of death without sex—i.e. sexual reproduction
fails (zero fecundity), primarily because of relatively small plant size. I propose that this ‘problem of the small’ represents
one of the principal driving forces of evolution by natural selection, and that the main product of this selection is ‘reproductive
economy’, manifested by several plant traits that are widely distributed among angiosperms: sexual maturity at a relatively
young age and small size, relatively small seed size, selfing (including through mixed mating), and of particular interest
here, clonality. In non-clonal species, an offspring develops from a zygote into a single ‘rooted unit’, i.e. a distinct vascular
transition point between live shoot and root tissue. Clonal species can produce an indeterminate number of these rooted unit
offspring asexually, all as products of a single zygote. Clonality is a common strategy in angiosperms because it confers
a potential two-fold fitness benefit—especially in relatively small species—by promoting longevity of the zygote product,
while at the same time providing a fecundity supplement (through asexual multiplication of rooted units), thereby allowing
offspring production economically, i.e. without requiring large adult size, and without even requiring the fertilization of
ovules. The primary fitness benefit from clonality, therefore, is that the somatic product of a zygote can effectively avoid
an intrinsic limitation predicted for all non-clonal plants: the trade-off between longevity and the potential rate of offspring/descendant
production. These major fitness benefits of clonality are explored in considering why clonality is less common in larger species,
why the largest species (trees) generally do not have the longest-lived zygote product, and in re-assessing traditional and
recent views concerning the loss of sex in clonal plants, the predicted trade-off between the size and number of clonal offspring,
and the predicted trade-off between sexual and asexual reproduction. 相似文献
5.
Valdemaras Žiliukas Vida Žiliukienė Rimantas Repečka 《Central European Journal of Biology》2012,7(5):858-866
The aim of this study was to assess juvenile fish communities in terms of species composition, fish diversity and density in the littoral zone of the Kaunas reservoir before (in 1989–1990, period I) and after (in 1999–2000, period II, and in 2006–2007, period III) launching the Kruonis hydroelectric pumped plant (Kruonis HPP). During the whole research period, 20 fish species were caught. According to the frequency of occurrence, the three-spined stickleback Gasterosteus aculeatus, European perch Perca fluviatilis and roach Rutilus rutilus were regarded as constant species in all investigated periods. Significant differences were established in juvenile fish community density between period I and periods II and III, whereas species richness (S) and species diversity indices (H′, J′) did not change significantly. The density of the shoreline community in period III was more than two times lower than in period I, probably due to higher fluctuations in water level of the reservoir, resulting from the Kruonis HPP operation. 相似文献
6.
Fuentes M 《Theoretical population biology》2004,66(3):199-203
The unified neutral theory of biodiversity provides a very simple and counterintuitive explanation of species diversity patterns. By specifying speciation, community size and dispersal, and completely ignoring differences among individual organisms and species, it generates biodiversity patterns that remarkably resemble natural ones. Here I show that adding even slight differences among organisms generates very different patterns and predictions. In large communities with widespread dispersal, heritable differences in viability among individual organisms lead to biodiversity patterns characterised by the overdominance of a single species comprising organisms with relatively high fitness. In communities with local dispersal, the same differences produce rapid community extinction. I conclude that the unified neutral theory is not robust to slight deviations from its most controversial assumption. 相似文献
7.
Rikvold PA 《Journal of mathematical biology》2007,55(5-6):653-677
We compare and contrast the long-time dynamical properties of two individual-based models of biological coevolution. Selection
occurs via multispecies, stochastic population dynamics with reproduction probabilities that depend nonlinearly on the population
densities of all species resident in the community. New species are introduced through mutation. Both models are amenable
to exact linear stability analysis, and we compare the analytic results with large-scale kinetic Monte Carlo simulations,
obtaining the population size as a function of an average interspecies interaction strength. Over time, the models self-optimize through mutation and selection to approximately maximize a community potential function, subject only to constraints internal
to the particular model. If the interspecies interactions are randomly distributed on an interval including positive values,
the system evolves toward self-sustaining, mutualistic communities. In contrast, for the predator–prey case the matrix of interactions is antisymmetric, and a nonzero population
size must be sustained by an external resource. Time series of the diversity and population size for both models show approximate
1/f noise and power-law distributions for the lifetimes of communities and species. For the mutualistic model, these two lifetime
distributions have the same exponent, while their exponents are different for the predator–prey model. The difference is probably
due to greater resilience toward mass extinctions in the food-web like communities produced by the predator–prey model.
相似文献
8.
The spatial scale of disturbance is a factor potentially influencing the relationship between disturbance and diversity. There
has been discussion on whether disturbances that affect local communities and create a mosaic of patches in different successional
stages have the same effect on diversity as regional disturbances that affect the whole landscape. In a microcosm experiment
with metacommunities of aquatic protists, we compared the effect of local and regional disturbances on the disturbance–diversity
relationship. Local disturbances destroyed entire local communities of the metacommunity and required reimmigration from neighboring
communities, while regional disturbances affected the whole metacommunity but left part of each local community intact. Both
disturbance types led to a negative relationship between disturbance intensity and Shannon diversity. With strong local disturbance,
this decrease in diversity was due to species loss, while strong regional disturbance had no effect on species richness but
reduced the evenness of the community. Growth rate appeared to be the most important trait for survival after strong local
disturbance and dominance after strong regional disturbance. The pattern of the disturbance–diversity relationship was similar
for both local and regional diversity. Although local disturbances at least temporally increased beta diversity by creating
a mosaic of differently disturbed patches, this high dissimilarity did not result in regional diversity being increased relative
to local diversity. The disturbance–diversity relationship was negative for both scales of diversity. The flat competitive
hierarchy and absence of a trade-off between competition and colonization ability are a likely explanation for this pattern. 相似文献
9.
Gravel pits support waterbird diversity in an urban landscape 总被引:1,自引:1,他引:0
Few studies exist documenting changes in rotifer communities over long time intervals. Here, we explore seasonal and long-term
variation in rotifer communities in four Polish lakes sampled in 1976 and again in 1997. Rarefied, asymptotic species richness
did not differ significantly across study years, although values in 1997 tended to be higher. Simpson’s and Shannon–Wiener
diversity measures provided inconsistent temporal results, with only the former indicating significantly higher richness in
1997. Sorensen’s coefficient of community similarity was as high among lakes in 1976 (0.81) and in 1997 (0.76) as within lakes
across the 21-year span (0.77). Nonlinear redundancy analysis of species’ abundances revealed large, consistent seasonal changes
across lakes, smaller consistent shifts between sampling periods, and small differences between lakes. Collectively, these
metrics indicate that species composition was relatively stable among lakes within years and within lakes between years, while
species’ abundance patterns were far more variable and most affected by season.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.
Handling editor: S. I. Dodson 相似文献
10.
Dysosma pleiantha, an important threatened medicinal plant species, is restricted in distribution to southeastern China. The species is capable
of reproducing both sexually and asexually. In this study, inter-simple sequence repeat marker data were obtained and analyzed
with respect to genetic variation and genetic structure. The extent of clonality, together with the clonal and sexual reproductive
strategies, varied among sites, and the populations under harsh ecological conditions tended to have large clones with relatively
low clonal diversity caused by vegetative reproduction. The ramets sharing the same genotype show a clumped distribution.
Across all populations surveyed, average within-population diversity was remarkably low (e.g., 0.111 for Nei’s gene diversity),
with populations from the nature reserves maintaining relatively high amounts of genetic diversity. Among all populations,
high genetic differentiation (AMOVA: ΦST = 0.500; Nei’s genetic diversity: G
ST = 0.465, Bayesian analysis: ΦB = 0.436) was detected, together with an isolation-by-distance pattern. Low seedling recruitment due to inbreeding, restricted
gene flow, and genetic drift are proposed as determinant factors responsible for the low genetic diversity and high genetic
differentiation observed. 相似文献
11.
Theories of the differentiation of ecological communities on landscapes have typically not considered evolutionary dynamics. Here we analytically study the expected differentiation among local communities in a large metacommunity, undergoing speciation, ecological drift and intercommunity dispersal, in the context of neutral theory. We demonstrate that heterogeneity in species diversity and abundance arises among communities when local communities are small and intercommunity migration is infrequent. We propose a new measure to describe community differentiation, defined as the average correlation or the average probability (Cst ) that two randomly sampled individuals of the same species within local communities are from the same ancestor. The effects of driving forces (migration, mutation, and ecological drift) are incorporated into the two-level hierarchical community structure in a finite island model of neutral communities. Community differentiation can increase the effective metacommunity size or the Hubbell's fundamental species diversity in the metacommunity by a factor (1−Cst )−1 . Significant community differentiation arises when Cst ≠0. Intercommunity migration promotes species diversity in local communities but reduce species diversity in the metacommunity. In either the finite or infinite island case, one can estimate the number of intercommunity migrants by using multiple local community datasets when the speciation is negligible in the neutral local communities, or by using the metacommunity dataset when the speciation is included in the local neutral communities. These results highlight the significance of the evolutionary mechanisms in generating heterogeneous communities in the absence of complicated ecological processes on large landscapes. 相似文献
12.
Pathogens and parasites can be strong agents of selection, and often exhibit some degree of genetic specificity for individual
host strains. Here we show that this host–pathogen specificity can affect the evolution of host life history traits. All else
equal, evolution should select for genes that increase individuals' reproduction rates or lifespans (and thus total reproduction
per individual). Using a simple host–pathogen model, we show that when the genetic specificity of pathogen infection is low,
host strains with higher reproduction rates or longer lifespans drive slower-reproducing or shorter-lived host strains to
extinction, as one would expect. However, when pathogens exhibit specificity for host strains with different life history
traits, the evolutionary advantages of these traits can be greatly diminished by pathogen-mediated selection. Given sufficient
host–pathogen specificity, pathogen-mediated selection can maintain polymorphism in host traits that are correlated with pathogen
resistance traits, despite large intrinsic fitness differences among host strains. These results have two important implications.
First, selection on host life history traits will be weaker than expected, whenever host fitness is significantly affected
by genotype-specific pathogen attack. Second, where polymorphism in host traits is maintained by pathogen-mediated selection,
preserving the genetic diversity of host species may require preserving their pathogens as well.
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
13.
Habitat fragmentation and invasion by exotic species are regarded as major threats to the biodiversity of many ecosystems.
We surveyed the plant communities of two types of remnant sagebrush-steppe fragments from nearby areas on the Snake River
Plain of southeastern Idaho, USA. One type resulted from land use (conversion to dryland agriculture; hereafter AG Islands)
and the other from geomorphic processes (Holocene volcanism; hereafter kipukas). We assessed two predictions for the variation
in native plant species richness of these fragments, using structural equation models (SEM). First, we predicted that the
species richness of native plants would follow the MacArthur–Wilson (M–W) hypothesis of island biogeography, as often is expected
for the communities of habitat fragments. Second, we predicted a negative relationship between native and exotic plants, as
would be expected if exotic plants are decreasing the diversity of native plants. Finally, we assessed whether exotic species
were more strongly associated with the fragments embedded in the agricultural landscape, as would be expected if agriculture
had facilitated the introduction and naturalization of non-native species, and whether the communities of the two types of
fragments were distinct. Species richness of native plants was not strongly correlated with M–W characteristics for either
the AG Islands or the **kipukas. The AG Islands had more species and higher cover of exotics than the kipukas, and exotic
plants were good predictors of native plant species richness. Our results support the hypothesis that proximity to agriculture
can increase the diversity and abundance of exotic plants in native habitat. In combination with other information, the results
also suggest that agriculture and exotic species have caused loss of native diversity and reorganization of the sagebrush-steppe
plant community. 相似文献
14.
N. V. Joshi 《Journal of genetics》1990,69(3):127-139
For a population made up of individuals capable of sexual as well as asexual modes of reproduction, conditions for the spread
of a transposable element are explored using a one-locus, two-haplotype model. The analysis is then extended to include the
possibility that the transposable element can modulate the probability of sexual reproduction, thus casting Hickey’s (1982,Genetics 101: 519–531) suggestion in a population genetics framework. The model explicitly includes the cost of sexual reproduction,
fitness disadvantage to the transposable element, probability of transposition, and the predisposition for sexual reproduction
in the presence and absence of the transposable element. The model predicts several kinds of outcome, including initial frequency
dependence and stable polymorphism. More importantly, it is seen that for a wide range of parameter values, the transposable
element can go to fixation. Therefore it is able to convert the population from a predominantly asexual to a predominantly
sexual mode of reproduction. Viewed in conjunction with recent results implicating short stretches of apparently non-coding
DNA in sex determination (McCoubreyet al. 1988,Science 242: 1146–1151), the model hints at the important role this mechanism could have played in the evolution of sexuality. 相似文献
15.
Four measures of biodiversity (species number per site, total species number, mean similarity and mosaic diversity) and their relationships with soil chemical composition were studied in vascular plant communities in groundwater discharge ecosystems of central Spain. Species richness decreased with increasing salinity, alkalinity and halite concentration. Species richness was apparently controlled more by soil toxicity than by soil nutrient levels, although a positive correlation of Ca2+ with species richness was found after accounting for the effects of toxic compounds. All relationships were strictly monotonic. Six community types were identified based on their soil chemical characteristics: glycophyte, subglycophyte, tolerant, subalkalinophyte, alkalinophyte, and halocalcicole communities. Within community types, species richness showed very few significant relationships with soil characteristics. Mean species richness was lowest in the environmentally stressful communities. Total species richness was greatest in the ecotonal community type. Mean similarity, a measure of among-community diversity, and mosaic diversity, a measure of landscape complexity, differed among community types. Mean similarity was smaller (higher diversity) in species-poor community types, while mosaic diversity was greatest (greater complexity) in species-rich community types. The halocalcicole community type was richest in rare species. 相似文献
16.
Annette Ostling 《Theoretical Ecology》2012,5(2):181-194
Neutral theory in ecology is aimed at describing communities where species coexist due to similarities rather than the classically
posited niche differences. It assumes that all individuals, regardless of species identity, are demographically equivalent.
However, Hubbell suggested that neutral theory may describe even niche communities because tradeoffs equalize fitness across
species which differ in their traits. In fact, tradeoffs can involve stabilization as well as fitness equalization, and stabilization
involves different dynamics and can lead to different community patterns than neutral theory. Yet the important question remains
if neutral theory provides a robust picture of all fitness-equalized communities, of which communities with demographic equivalence
are one special case. Here, I examine Hubbell’s suggestion for a purely fitness-equalizing interspecific birth–death tradeoff,
expanding neutral theory to a theory describing this broader class of fitness-equalized communities. In particular, I use
a flexible framework allowing examination of the influence of speciation dynamics. I find that the scaling of speciation rates
with birth and death rates, which is poorly known, has large impacts on community structure. In most cases, the departure
from the predictions of current neutral models is substantial. This work suggests that demographic and speciation complexities
present a challenge to the future development and use of neutral theory in ecology as null model. The framework presented
here will provide a starting point for meeting that challenge, and may also be useful in the development of stochastic niche
models with speciation dynamics. 相似文献
17.
Baoshan Cui Xinsheng Zhao Zhifeng Yang Bin Chen Na Tang Xuejie Tan 《Frontiers of Biology in China》2008,3(2):194-202
We investigated and monitored a reed community in the fields. Data on the bio-ecological characteristics and β-diversity of reed communities in different environmental gradients (mainly based on water depth) of the Yellow River Delta
were collected through multianalysis, extremum analysis and β-diversity index analysis. In accordance with the square sum of deviations (Ward) cluster analysis, 10 sampling plots were
divided into six types with the dominant plants in different plots varying according to the change in environmental gradients.
The dominant plants in these plots varied from aquatic plants to xerophytes and salt tolerant plants as water depth decreased.
The average height and diameter of the reeds at breast level were significantly correlated with the average water depth. The
fitness curves of average density and coverage with average water depth were nonlinear. When the average water depth was 0.3
m, the average density and coverage of reeds reached the apex value, while the height and diameter of the reeds at breast
level increased with the water depth. There were obvious changes to the environmental gradient in the Yellow River Delta.
The transitional communities were also found to exist in the Yellow River Delta by β-diversity analysis. Vicarious species appeared with the change in water depth. The occurrence of substitute species is determined
by the function of common species between adjacent belts. The different functions of common species led to differences in
community structure and function and differences in dominant plants. The result reflects the variations of species present
in different habitats and directly reflects environmental heterogeneity. The values of β-diversity indices of adjacent plots were higher than those of nonadjacent plots. There are transition zones between the xerophytes
and aquatic plants in the Yellow River Delta. In an aquatic environment, the similarity of reed community is higher than that
of xeromorphic plants. The β-diversity index can reflect plant succession trends caused by the change in environmental gradients in the Yellow River Delta.
The β-diversity index reveals plant responses to changes in environmental gradient and is helpful in observing changes in patterns
of species diversity in relation to environmental gradient change and evolving trends in the future, which in turn plays a
prominent role when environmental water requirements of wetland are discussed.
__________
Translated from Acta Ecologica Sinica, 2006, 26(5): 1533–1541 [译自: 生态学报] 相似文献
18.
There are only few studies on shallow Antarctic benthic communities associated with habitats affected by intense mineral sedimentation
inflow. The analysis of macrofaunal communities associated with two shallow, isolated glacial coves was performed in Admiralty
Bay (King George Island) and compared with non-disturbed sites. Multivariate analyses (hierarchical classification, nMDS)
clearly separated glacial cove communities (two assemblages) from the sites situated outside both basins (two assemblages).
The community influenced by the streamflow of glacial discharge of meltwater situated in the area with sandy–clay–silt sediments
had a very low species richness, diversity and abundance. It was dominated by eurytopic, motile deposit feeding polychaetes
such as Mesospio
moorei, Tharyx
cincinnatus and Leitoscoloplos
kerguelensis as well as the bivalve Yoldia
eightsi. The second glacial community of the area located at a grater distance from the outlet of the stream was characterized by
sandy–clay–silt and clay–silt deposits and showed also a low diversity and species richness. The most abundant here were peracarid
crustaceans, with the dominant opportunistic feeder Cheirimedon
femoratus. Community from the non-disturbed area with silty–clay–sand, and silty–sand sediments had higher species richness and diversity.
The assemblage of fauna from the sandy bottom has values of those two indexes similar to those found in the disturbed areas. 相似文献
19.
We examined how dominance (% canopy cover) and invasion history of common reed, Phragmites australis, affected benthic macroinvertebrate diversity and density in 8 marshes along Lake Erie’s southern shoreline. We also compared
macroinvertebrate densities among patches (0.25 m2) of reed, cattail (Typha spp.), and native flora (e.g., Sagittaria, Sparganium) and epiphytic algal communities on submerged stems of reed and cattail. Narrow-leaf cattail (T. angustifolia) is also a common invasive plant to these wetlands, but does not greatly change plant community composition or ecosystem
conditions like reed. Macroinvertebrate diversity (Shannon–Weaver H′) was positively related to reed cover and was highest (4.6) in two marshes with ~35- and 5-year invasion histories. Shading
from high reed cover increased H′-diversity, in part, by reducing the abundance of floating duckweed, which harbored many Hyalella azteca amphipods. Percent Ephemeroptera, Odonata, and Trichoptera was low to moderate across marshes, regardless of reed cover and
invasion history. Macroinvertebrate density was not affected by reed cover or average plant stem density, and did not differ
among plant types. However, epiphyton densities and % diatoms were greater on reed than on cattail, suggesting reed provides
a better feeding habitat for microalgal grazers than Typha. Abundance rankings of common species in these diatom-dominated communities were also typically dissimilar between these
plant types. Although % grazers was unrelated to epiphyton densities and % diatoms, grazer identity (snails) differed between
natural and diked marshes, which had different microalgal food supplies. Our findings suggest that Phragmites does not necessarily adversely affect macroinvertebrate community structure and diversity and that invasion history alone
has little effect on the H′-diversity–reed dominance relationship. 相似文献
20.
The species composition of a community is a subset of the regional species pool, and predicting the species composition of
a community from ecological traits of organisms is an important objective in ecology. If such a prediction can be made feasible,
we could assess the risk of invasion of locally new species (alien species and genetically modified species) into natural
communities. We developed and tested statistical models to predict a community’s species composition from ecological traits
of the species pool. Various types of communities (forest, meadow, and weed communities) exist in a small area of traditional
rural landscape in Japan, and have been maintained by human activities. These communities and the tracheophytes species pool
in the 1-km2 research area were considered. We used logistic regression and decision-tree analysis to construct predictive models of community
species composition based on plant traits, using the presence or absence of species in a community as the dependent variable
and ecological traits as independent variables. Plant traits were grouped by cluster analysis, and the average in each trait
group was used for model building to avoid multiple collinearity. Statistical prediction models were significant in all communities.
About 60–75% of species composition could be predicted from the measured plant traits in forest communities, but 33–56% in
the meadow and weed communities. Our results showed the possibility of predicting the species composition of plant communities
from the ecological traits of the plant species together with the information on local species pool. 相似文献