Unimodal Models to Relate Species to Environment.

Braak, C.J.F. ter

doi:10.2307/2531886

Cited by 125 publications

(104 citation statements)

References 105 publications

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“…The sampling sites along the slopes were related to the different soil biotic components and the soil physical parameters in order to obtain the proportional variations that contribute to the understanding of each component [45]. The Monte Carlo permutation test was used to calculate the significance of a given factor and, thus, its relevance to the measured parameter [46].…”

Section: Discussionmentioning

confidence: 99%

The effects of prescribed fire on soil nematodes in an arid juniper savanna

Whitford¹,

Pen-Mouratov²,

Steinberger

2014

OJE

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Prescribed fire produced a landscape with two types of severely burned patches: charred shrub patches and charred patches with tree trunks at the center. Soil nematodes were more abundant in burned and unburned juniper (Juniperus monosperma) tree patches than in yucca-shrub patches. There were no differences in nematode abundance between burned and unburned patches during the late spring and summer samples. Nematode abundance was significantly (p < 0.05) higher in unburned patches than in burned patches in the early spring samples, reflecting large differences in soil moisture between unburned and burned patches. There were no differences in soil nematode abundance between burned and unburned patches at oneyear post-burn and three-year post-burn sites. When all samples were pooled, taxonomic diversity, ecological indices, and abundance of trophic groups (bacteria-feeders, fungi-feeders, and omnivore-predators) were higher in unburned than burned patches. These results suggest that the long-term (up to three years post-burn) effects of fire on soil nematodes are indirect, i.e., by loss of tree canopies, litter accumulation, and shrub foliage, which affects soil temperatures and water redistribution.

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Section: Discussionmentioning

confidence: 99%

The effects of prescribed fire on soil nematodes in an arid juniper savanna

Whitford¹,

Pen-Mouratov²,

Steinberger

2014

OJE

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“…Conversely, Achnanthidium minutissimum was significantly negatively correlated with Cond, Sal, TN, TP NH3-N, and TN/TP, but positively correlated with pH and WT. [50,51]. A two-dimensional ordination map was generated using the dominant species of diatom and their influencing factors in the Ying River (Figure 7).…”

Section: Pearson's Correlation Analysismentioning

confidence: 99%

“…The angle between the line and the sorting axis indicates that the size of the function partitioning factor is related to the sorting axis, with a smaller angle indicating a greater correlation. [50,51]. A two-dimensional ordination map was generated using the dominant species of diatom and their influencing factors in the Ying River (Figure 7).…”

Section: Pearson's Correlation Analysismentioning

confidence: 99%

Benthic Diatoms of the Ying River (Huaihe River Basin, China) and Their Application in Water Trophic Status Assessment

Shen

Ren

et al. 2018

Water

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Abstract:Benthic diatoms are an indispensable link of the water ecological system in terms of energy flow and material cycling, and they directly or indirectly reflect the status of the water environment. We sampled benthic diatoms and environmental factors from April to May of 2013 from 53 sites along the Ying River to study their application in local water trophic status assessment, with a focus on the dominant benthic diatom species, their composition and distribution pattern, and the relationship between benthic diatoms and environmental factors. A total of 370 species and varieties were identified, belonging to 56 genera and six orders. The dominant species were as follows: Nitzschia inconspicua Grunow, Achnanthidium minutissimum (Kützing) Czarnecki, Navicula aitchelbee L. L. Bahls, Nitzschia palea (Kützing) Smith, Cyclotella meneghiniana Kützing, Navicula submuralis Hustedt and Mayamaea atomus (Kützing) Lange-Bertalot. The Ying River was divided into five orders using the Strahler method and three regions according to total nitrogen, total phosphorus and ammonia nitrogen. In region Y-1, which had the lowest nutrient level, the dominant species was Achnanthidium minutissimum. In region Y-2, which had the highest nutrient level, Navicula aitchelbee, Nitzschia palea, and Cyclotella meneghiniana were dominant, while in region Y-3, which had moderate nutrient levels, Nitzschia inconspicua was dominant. Pearson's correlation analysis and canonical correspondence analysis (CCA) revealed a significant correlation between the environmental factors with dominant species and diatom indices (especially the SPI). Our study indicates that dominant species and diatom indices can, to some extent, indicate the environment, especially nutrient distribution.

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“…A redundancy analysis (RDA) (R-project program) was used to assess the amount of variation in faunal densities related to a set of habitat environmental characteristics (Ter Braak, 1996). Previous analysis of the main species showed a linear response in their abundance in relation to the environmental variables used.…”

Section: Discussionmentioning

confidence: 99%