scholarly journals The efficient use of small plots in a fynbos phytosociological study in the northern Cederberg: a quick way to collect plant-environmental data

Bothalia ◽  
1993 ◽  
Vol 23 (2) ◽  
pp. 265-269
Author(s):  
P. J. Mustart ◽  
E. J. Moll ◽  
H. C. Taylor

A phytosociological survey of selected plant communities in the northern Cederberg was made using small (4-16 m') plot sizes. A satisfactory phytosociological table was obtained, and plant-environmental relationships were inferred from it. The use of small plot sizes enabled ecological information about plant communities to be quickly, easily and efficiently obtained. This method could be of considerable use for establishing and monitoring vegetation patterns.

Author(s):  
Yvan Le Bras ◽  
Aurélie Delavaud ◽  
Dominique Pelletier ◽  
Jean-Baptiste Mihoub

Most biodiversity research aims at understanding the states and dynamics of biodiversity and ecosystems. To do so, biodiversity research increasingly relies on the use of digital products and services such as raw data archiving systems (e.g. structured databases or data repositories), ready-to-use datasets (e.g. cleaned and harmonized files with normalized measurements or computed trends) as well as associated analytical tools (e.g. model scripts in Github). Several world-wide initiatives facilitate the open access to biodiversity data, such as the Global Biodiversity Information Facility (GBIF) or GenBank, Predicts etc. Although these pave the way towards major advances in biodiversity research, they also typically deliver data products that are sometimes poorly informative as they fail to capture the genuine ecological information they intend to grasp. In other words, access to ready-to-use aggregated data products may sacrifice ecological relevance for data harmonization, resulting in over-simplified, ill-advised standard formats. This is singularly true when the main challenge is to match complementary data (large diversity of measured variables, integration of different levels of life organizations etc.) collected with different requirements and scattered in multiple databases. Improving access to raw data, and meaningful detailed metadata and analytical tools associated with standardized workflows is critical to maintain and maximize the generic relevance of ecological data. Consequently, advancing the design of digital products and services is essential for interoperability while also enhancing reproducibility and transparency in biodiversity research. To go further, a minimal common framework organizing biodiversity observation and data organization is needed. In this regard, the Essential Biodiversity Variable (EBV) concept might be a powerful way to boost progress toward this goal as well as to connect research communities worldwide. As a national Biodiversity Observation Network (BON) node, the French BON is currently embodied by a national research e-infrastructure called "Pôle national de données de biodiversité" (PNDB, formerly ECOSCOPE), aimed at simultaneously empowering the quality of scientific activities and promoting networking within the scientific community at a national level. Through the PNDB, the French BON is working on developing biodiversity data workflows oriented toward end services and products, both from and for a research perspective. More precisely, the two pillars of the PNDB are a metadata portal and a workflow-oriented web platform dedicated to the access of biodiversity data and associated analytical tools (Galaxy-E). After four years of experience, we are now going deeper into metadata specification, dataset descriptions and data structuring through the extensive use of Ecological Metadata Language (EML) as a pivot format. Moreover, we evaluate the relevance of existing tools such as Metacat/Morpho and DEIMS-SDR (Dynamic Ecological Information Management System - Site and dataset registry) in order to ensure a link with other initiatives like Environmental Data Initiative, DataOne and Long-Term Ecological Research related observation networks. Regarding data analysis, an open-source Galaxy-E platform was launched in 2017 as part of a project targeting the design of a citizen science observation system in France (“65 Millions d'observateurs”). Here, we propose to showcase ongoing French activities towards global challenges related to biodiversity information and knowledge dissemination. We particularly emphasize our focus on embracing the FAIR (findable, accessible, interoperable and reusable) data principles Wilkinson et al. 2016 across the development of the French BON e-infrastructure and the promising links we anticipate for operationalizing EBVs. Using accessible and transparent analytical tools, we present the first online platform allowing the performance of advanced yet user-friendly analyses of biodiversity data in a reproducible and shareable way using data from various data sources, such as GBIF, Atlas of Living Australia (ALA), eBIRD, iNaturalist and environmental data such as climate data.


Hacquetia ◽  
2016 ◽  
Vol 15 (2) ◽  
pp. 21-35 ◽  
Author(s):  
Alina Baranova ◽  
Udo Schickhoff ◽  
Shunli Wang ◽  
Ming Jin

Abstract Environmental degradation of pasture areas in the Qilian Mountains (Gansu province, NW China) has increased in recent years. Soil erosion and loss of biodiversity caused by overgrazing is widespread. Changes in plant cover, however, have not been analysed so far. The aim of this paper is to identify plant communities and to detect grazing-induced changes in vegetation patterns. Quantitative and qualitative relevé data were collected for community classification and to analyse gradual changes in vegetation patterns along altitudinal and grazing gradients. Detrended correspondence analysis (DCA) was used to analyse variation in relationships between vegetation, environmental factors and differential grazing pressure. The results of the DCA showed apparent variation in plant communities along the grazing gradient. Two factors - altitude and exposure - had the strongest impact on plant community distribution. Comparing monitoring data for the most recent nine years, a trend of pasture deterioration, plant community successions and shift in dominant species becomes obvious. In order to increase grassland quality, sustainable pasture management strategies should be implemented.


1948 ◽  
Vol 18 (2) ◽  
pp. 61-64
Author(s):  
Bernhard Kummel

Abstract Dwarfed and/or small cephalopods have been recorded from many parts of the geologic column. Data assembled from preliminary studies of the Cretaceous pyritic micromorph faunas of Texas and from an Upper Triassic (Norian) fauna from the Cordillera Central of northern Peru will be given. Both of these faunas contain an abundant cephalopod assemblage, mostly small in size, which are associated with other dwarfed and non-dwarfed invertebrates. Students of cephalopods are handicapped by the relative small amount of environmental data known on recent Nautilus. Some qualitative data on the environmental relationships of fossil cephalopods is known but practically no quantitative data is available. It is suggested that evolution has probably been an important factor in causing the development of some groups of small cephalopods.


Bothalia ◽  
1987 ◽  
Vol 17 (1) ◽  
pp. 121-129 ◽  
Author(s):  
D. J. Mcdonald

The data of a Braun-Blanquet vegetation classification was ordinated using detrended correspondence analysis (DCA). This was done at the Fynbos Biome intensive study site, Swartboschkloof, Jonkershoek, to investigate the factors determining the distribution of the plant communities. Superimposition of environmental data on the DCA ordination confirmed the indications of the Braun-Blanquet classification that the distribution of plant communities is most strongly correlated with soil geology and, to a lesser extent, with soil moisture status. The ordination also proved useful for examining the relationships between the transitional communites and the distinct communities of Swartboschkloof.


Bothalia ◽  
1992 ◽  
Vol 22 (2) ◽  
pp. 255-282 ◽  
Author(s):  
C. Joubert ◽  
E. J. Moll

A phytosociological study based on the collection of vegetation and environmental data from 53 randomly stratified sample plots on Signal Hill, Cape Town, was carried out over an area of 124 ha. The survey extended over 12 months to ensure the inclusion of as many plant species as possible, and a list of the vascular plant species was compiled. A total of 81 families, 255 genera and 460 species was identified. The phytosociological method revealed that only one major plant community occurs in the study area and two subcommunities, with a total of five variants correlated mostly with aspect and historic land use, were identified. The perennially and seasonally identifiable species were analysed separately to determine their relative contribution to the phytosociological classification. The two data sets gave similar classifications. A vegetation map as well as a soil map was compiled.


Bothalia ◽  
2003 ◽  
Vol 33 (1) ◽  
pp. 121-134 ◽  
Author(s):  
F. Siebert ◽  
G. J. Bredenkamp ◽  
S. J. Siebert

Data from fifteen phytosociological studies were merged and classified to describe and compare the vegetation of geo­graphically separated and climatically different Mopanev eld types in South Africa. Namibia and Zimbabw e. Seven v egetation types and ten major plant communities were identified using TW INSPAN. Vegetation types were separated according to geo­graphical regions. There were significant floristic affinities even though there w ere geological and climatic differences between the regions. Plant communities were described according to vegetation structure, habitat and floristic composition. Although environmental data were not adequate for a detailed ordination. DECORANA reflected the distribution of vegetation types and major plant communities along environmental gradients. Limitations of large phytosociological syntheses were also addressed. Species richness (alpha diversity) was calculated for each geographical region. The Musina (Messina) region north of the Soutpansberg. South Africa, has the highest species richness, and Kaokoland. Namibia, the lowest Due to irregular annual rainfall patterns in semi-arid Mopaneveld, it is suggested that variance in species richness is associated with temporal vegeta­tion states induced by rainfall events. Species richness of Mopaneveld was further compared w ith other sav anna types.


1998 ◽  
Vol 33 (2) ◽  
pp. 133-145 ◽  
Author(s):  
Juan José Cantero ◽  
José Manuel Cisneros ◽  
Martin Zobel ◽  
Alberto Cantero

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. G. Clerc ◽  
S. Echeverría-Alar ◽  
M. Tlidi

AbstractSelf-organisation is a ubiquitous phenomenon in ecosystems. These systems can experience transitions from a uniform cover towards the formation of vegetation patterns as a result of symmetry-breaking instability. They can be either periodic or localised in space. Localised vegetation patterns consist of more or less circular spots or patches that can be either isolated or randomly distributed in space. We report on a striking patterning phenomenon consisting of localised vegetation labyrinths. This intriguing pattern is visible in satellite photographs taken in many territories of Africa and Australia. They consist of labyrinths which is spatially irregular pattern surrounded by either a homogeneous cover or a bare soil. The phenomenon is not specific to particular plants or soils. They are observed on strictly homogenous environmental conditions on flat landscapes, but they are also visible on hills. The spatial size of localized labyrinth ranges typically from a few hundred meters to ten kilometres. A simple modelling approach based on the interplay between short-range and long-range interactions governing plant communities or on the water dynamics explains the observations reported here.


PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0247966
Author(s):  
Liyew Birhanu ◽  
Tamrat Bekele ◽  
Binyam Tesfaw ◽  
Sebsebe Demissew

Plant community types are influenced by topographic factors, the physical and chemical properties of soil. Therefore, the study was carried out to investigate the relationships of soil and topographic factors on the distribution of species and plant community formation of the Dega Damot district in Northwestern Ethiopia. Vegetation and environmental data were collected from 86 plots (900 m2). Agglomerative hierarchical cluster analysis and redundancy analysis (RDA) with R software were used to identify plant communities and analyze the relationship between plant community types and environmental variables. Five plant community types were identified: Erica arborea-Osyris quadripartita, Discopodium penninervium-Echinops pappii, Olea europaea -Scolopia theifolia, Euphorbia abyssinica-Prunus africana, Dodonaea anguistifolia-Acokanthera schimperi. The RDA result showed that the variation of species distribution and plant community formation were significantly related to altitude, organic matter, moisture content, slope, sand, pH, EC, total nitrogen and phosphorus. Our results suggest that the variation of plant communities (Community 1, 2, 3, and 4) were closely related to environmental factors, including altitude, moisture content, OM, slope, sand, pH, EC, soil nitrogen, and phosphorus, among which altitude was the most important one. However, all the measured environmental variables are not correlated to Dodonaea anguistifolia-Acokanthera schimperi community type. Therefore, it can be concluded that some other environmental variables may influence the species composition, which is needed to be further investigated.


Koedoe ◽  
1994 ◽  
Vol 37 (2) ◽  
Author(s):  
L.R. Brown ◽  
G.J. Bredenkamp

As part of a vegetation survey programme for conservation areas in South Africa, the plant communities of the Borakalalo Nature Reserve were investigated. A TWINSPAN classification, refined by Braun-Blanquet procedures was used for a phytosociological study. The analysis resulted in five major plant communities, one with two subcommunities and one with four subcommunities and two variants. Habitat factors associated with differences in vegetation include topography, soil form and grazing pressure. Descriptions of the plant communities include diagnostic species as well as prominent and less conspicuous species of the tree, shrub, forb and grass strata. The classification provides the necessary delimitation of homogeneous areas which are considered necessary for veld management.


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