Tìm thấy 20+ kết quả cho từ khóa "Species richness"
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In this study, we found that the rates of genome rear- rangements are highly heterogeneous among different lin- eages of fungal species and there is a positive correlation between the rates of genome rearrangement and species richness. Here, we provided solid lines of evidence to sup- port an important role of rates of genome rearrangement in promoting species richness.
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Correlation analysis showed a negative relationship between species richness and salinity, i.e., the decrease of species richness with increasing salinity under natural conditions. Lymbery et al. (2003) reported similar results on the significance of the relations of species composition to soil salinity and plant species.
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21.1 Introduction. biodiversity and species richness.
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A number of studies have compared species richness between relatively homogeneous and heterogeneous environments (e.g., Cromartie 1975, Risch Root 1973, D. of the niche and permitting species richness to increase. Bond (1993) and Power et al. Such trophic cascades are commonly observed in aquatic ecosystems (Batzer et al. Hunter et al. Nakano et al. Communities are composed of the species occupying a site.
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Grazing only increased plant species richness in the most productive site (wadi) (Figure 19.16d). In the high productivity wadi sites, how- ever, species richness continued to increase with grazing, most likely because of a reduction in light competition through removal of the palatable larger species.. 19.4.2 The effect of carnivores.
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Figure 20.10 (a) The coefficient of variation of population biomass for 39 plant species from plots in four fields in Minnesota over 11 years plotted against species richness in the plots.. Figure 20.11 Variation (i.e. Richness is described as ‘realized’ because it refers to the number of species present at the time of the observation, irrespective of the number of species with which the community was initiated.. importance of the nature – not just the richness – of the community.
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Shrub abundance had no significant effects on six soil ecosystem functions in our study sites, but shrub species richness had a significant ( p <. Edwards et al., 2019 . Mukul et al., 2019 . Pires et al., 2018 . Nadrowski et al., 2010. A growing number of ecological studies have investigated the effects of species diversity and climatic factors on soil ecosystem functions in boreal, temperate and grassland ecosys- tems (see – Eisenhauer et al., 2018 .
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Figure 22.2 (a) Tree species richness in different tree size classes (Dbh is diameter at breast height) in three categories of benzoin garden (G1, most intensely managed. 22.2.2 Managing succession for restoration.
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Biomass and species richness of fish larvae were highest in the winter and summer. Key words: Fish larvae, biomass, species richness, sampling frequency, Northeastern Aegean Sea. salinity ppt) of the South Aegean Sea and lower temperatures (Zodiatis, 1994). deeper rocky coasts with a steep shelf in the north and sandy, shallow habitats in the south. In this study, community structure and temporal changes of fish larvae collected from Gökçeada Island have been studied.
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Summer Autumn Winter Spring Summer Autumn Winter Spring Summer Autumn Winter Spring prey species diversity index (H') prey richness (S) prey evenness (E). F) of occurrence of prey species in the diet of common leopard in and around Pir Lasura National Park.. Prey species diversity index, prey species richness, and evenness in diet of sympatric carnivore species in and around Pir Lasura National Park..
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Figure 16.3 The relationship between species richness and the number of individual organisms from two contrasting hypothetical communities. Figure 16.4 shows how species diversity (H) and equitability ( J ) of the grass species changed between 1856 and 1949. A range of the many equations that have been fitted to rank–abundance diagrams is shown in Figure 16.5..
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Species diversity is defined as the number of both rare and common species in a community, and that includes species richness (number of species) and evenness (equitability of individuals among species) (Hamilton, 2005). Although species diversity displays fluctuation over a spatial scale, it is important for the conservation of biodiversity (Engen et al., 2008).
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From this, a total of 396 individuals of bats from 33 species were recorded in primary forest, 608 individuals of bats from 31 species were recorded in secondary forest and 222 individuals of bats from 11 species were recorded in the urban forest. Species richness in the secondary forest is the highest (Dmn = 1.616) followed by the primary forest (Dmn = 1.257) and the urban forest (Dmn = 0.7383).
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Micraspis discolor (F), Harmonia dimidiata (F), Episyrphus belteotus (L.) and one number of predatory spider, Oxyopes spp. were recorded from cabbage ecosystem.The diversity study of insect pests as well as predatorsin different phonological stages of cabbage indicated highest species diversity and evenness during the pre -heading stage of cabbage followed by heading stage whereas, highest species richness was recorded during seedling stage for both the varieties during 2017- 18 and 2018-19.. 428
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The dominance and frequency results of zooplankton in Uzungöl Lagoon.. 1 Frequency criterion cited in Paturej et al. 2 Species dominance classes cited in Paturej et al. The biological diversity of zooplankton communities in the Uzungöl Lagoon was evaluated based on species richness, Shannon diversity and Pielou’s evenness indices.. Mean Pielou’s evenness index remained in the range, minimum and.
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Temporal and spatial variation of phytoplankton metrics including species richness (S), Shannon diversity (H. species evenness (J) and Simpson diversity (D), in the DNR was showed in Fig. Results showed that there were significant differences in species richness between upper course sites and lower course sites (Fig. The mean values of species richness in dry and wet seasons were 37.7 and 30.5, respectively. The mean values of H’ index were 2.0 in dry and 2.3 in wet season.
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Chlorophyta was represented in the studied reservoir by a large number of species, but in low cell numbers (fig. In Tuyen Lam, there were two Cyanobacteria species, Microcystis wesenbergii and Microsystis sp., dominant throughout the year.. There was no differences in species richness of phytoplankton between two seasons (ANOVA, p= 0.348) (table 1).. In the ordination diagrams of CCA (fig.
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In this study, sites of conservation priority for amphibian species of Megorphrys were identified on the basis of the following criteria: species richness, number of endemic and threatened species, and level of human disturbance. A conservation breeding program should be considered for the species of economic value such as M. Species diversity: A total 18 species of the genus Megophrys was recorded in Vietnam.
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This shows that although crop 1 has more species richness the species diversity and the equality between species in the weed community are lower in crop 1 than in crop 3.. The rice fields inside the ring dike have a higher species abundance (d = 4,598) than those outside the ring dike (d = 3,990), but the indicators H 'and 1 - λ' are lower, because species type and species equality in the weed community is lower in the ring dike..
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In this study, we focused on assessment and comparison of the phytoplankton community structures using species richness, diversity indices, abundance, and biomass of data sets obtained in November 2015 (rainy season), August 2017 and August 2018, and June 2019 (dry season).