Data Analysis in Community and Landscape Ecology

Jongman, R.H.G.; Braak, C.J.F. ter; Tongeren, O. F. R. van

doi:10.1017/cbo9780511525575

Cited by 2,147 publications

(942 citation statements)

References 43 publications

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“…To detect dissimilarities among investigated forest habitats on basis of the lichen species abundances, cluster analysis was used (Jongman et al 1995). As a measure of dissimilarity among investigated habitats, Chord Distance Coefficient was selected (Ludwig & Reynolds 1988).…”

Section: Resultsmentioning

confidence: 99%

Ecological pattern of lichen species abundance in mixed forests of Eastern Romania

Vicol

2016

Ann. For. Res.

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Vicol, I. 2016. Ecological patterns of lichen species abundance in mixed forests of Eastern Romania. Ann. For. Res. 59(2): 237-248.Abstract. The importance of this study consists in the knowledge of the ecological attributes characteristic to mixed forestry habitats and how they affect the structure of the lichen species abundances. The field activities were performed within five forest habitat types from Moldavia Province, characterised mainly by oak mixed forests, riparian mixed forests and mixed beech forests. The habitat variables, tree variables and the lichen species abundances were analysed to get informations on the structural disimilarities, on the one hand, and relationships on the other hand. Within this study no significant disimilarities were found out from abundance lichen species point of view. The lichen species abundances are a result of interactions between components of their microhabitat and macrohabitat. The correlation analysis pointed out the preferences of lichen species to their host trees, especially Quercus and Fraxinus, altitude and tree level variables as are aspect and mosses coverage. The regression analysis has highlighted that the changes in lichen species abundances are caused by macrohabitat level predictors such as host trees represented by Fraxinus. This study demonstrates that, structure of lichen species is influenced by attributes of mixed forest habitats; therefore maintaining the diversity of tree species and ensuring the continuous occurrence of forestry land is necessary for lichen and their habitat conservation.

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Section: Resultsmentioning

confidence: 99%

Ecological pattern of lichen species abundance in mixed forests of Eastern Romania

Vicol

2016

Ann. For. Res.

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“…A Principal Components Analysis (PCA) was used to determine which environmental variables were important in the differentiation of sites (Jongman, 1995). The axes were selected using the Broken Stick criterion.…”

Section: Resultsmentioning

confidence: 99%

Effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle Xingu River in the eastern Amazon basin

et al. 2015

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The structure of fish assemblages in Neotropical rivers is influenced by a series of environmental, spatial and/or temporal factors, given that different species will occupy the habitats that present the most favourable conditions to their survival. The present study aims to identify the principal factors responsible for the structuring of the fish assemblages found in the middle Xingu River, examining the influence of environmental, spatial, and temporal factors, in addition to the presence of natural barriers (waterfalls). For this, data were collected every three months between July 2012 and April 2013, using gillnets of different sizes and meshes. In addition to biotic data, 17 environmental variables were measured. A total of 8,485 fish specimens were collected during the study, representing 188 species. Total dissolved solids, conductivity, total suspended matter, and dissolved oxygen concentrations were the variables that had the greatest influence on the characteristics of the fish fauna of the middle Xingu. Only the barriers and hydrological periods played a significant deterministic role, resulting in both longitudinal and lateral gradients. This emphasizes the role of the connectivity of the different habitats found within the study area in the structuring of its fish assemblages.Keywords: natural barriers, connectivity, hydrological periods, community ecology, impacts of hydroelectric dams. Efeito das cachoeiras e do pulso de inundação na estrutura das assembleias de peixes do Médio Rio Xingu, Amazônia oriental ResumoA estrutura da ictiofauna em rios neotropicais é constantemente influenciada por fatores ambientais, espaciais e/ou temporais, uma vez que as espécies tendem a ocupar ambientes com condições favoráveis à sua sobrevivência. Dessa forma, esta pesquisa tem como objetivo responder qual o principal fator responsável pela estruturação das assembleias de peixes no Médio Rio Xingu, testando a influência dos fatores ambientais, espaciais e temporais, além da presença de barreiras naturais (cachoeiras

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“…We used a hierarchical cluster analysis to explore how the plots were grouped in base to the similarity of the spider density, using the Bray Curtis as similarity index for the construction of the dendrogram (constrained, Unweighted Pair Group Method Average (UPGMA) algorithm and Bootstrap N = 2000) [40] [42]. We also applied the Non Metric Dimensional Scaling analysis (NMDS) using the Bray Curtis as similarity [43]. This technique is commonly used in ecological studies, specially to evaluate if the environmental disturbance affects the species composition, association of arthropods with plant species and other relationships between species and other biotic or abiotic variables [40] [44] [45].…”

Section: Resultsmentioning

confidence: 99%

Habitat Preference and Effects of Coastal Fragmentation in the Sand-Dwelling Spider <i>Allocosa brasiliensis</i> (Lycosidae, Allocosinae)

Jorge¹,

Laborda²,

Días³

et al. 2015

OJAS

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Allocosa brasiliensis is a sand-dwelling wolf spider considered a good bioindicator to evaluate the quality of coastal dune ecosystems from Uruguay. Habitat fragmentation and human activities have impacted and reduced the Southern Uruguayan coast during the last decades. The aim of the present study was to evaluate the density, surface activity and habitat preference of A. brasiliensis in beaches with different human impact. For that purpose, we sampled during the night with head lamps and applied the capture-mark-recapture method. Females were more abundant than males and were the most recaptured sex. The most fragmented beaches showed lower number of burrows and individuals, especially in immatures stages. We found that the most suitable sandy habitat for A. brasiliensis should present a vegetation cover optimum of 25% -50% of the surface. This study could provide tools for the implementation of future management conservation plans of the Southern Uruguayan coastline.

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Data Analysis in Community and Landscape Ecology

Cited by 2,147 publications

References 43 publications

Ecological pattern of lichen species abundance in mixed forests of Eastern Romania

Ecological pattern of lichen species abundance in mixed forests of Eastern Romania

Effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle Xingu River in the eastern Amazon basin

Habitat Preference and Effects of Coastal Fragmentation in the Sand-Dwelling Spider <i>Allocosa brasiliensis</i> (Lycosidae, Allocosinae)

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Data Analysis in Community and Landscape Ecology

Cited by 2,147 publications

References 43 publications

Ecological pattern of lichen species abundance in mixed forests of Eastern Romania

Ecological pattern of lichen species abundance in mixed forests of Eastern Romania

Effect of waterfalls and the flood pulse on the structure of fish assemblages of the middle Xingu River in the eastern Amazon basin

Habitat Preference and Effects of Coastal Fragmentation in the Sand-Dwelling Spider &lt;i&gt;Allocosa brasiliensis&lt;/i&gt; (Lycosidae, Allocosinae)

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Habitat Preference and Effects of Coastal Fragmentation in the Sand-Dwelling Spider <i>Allocosa brasiliensis</i> (Lycosidae, Allocosinae)