scholarly journals Habitat characteristics of the rare underground orchid Rhizanthella gardneri

2008 ◽  
Vol 56 (6) ◽  
pp. 501 ◽  
Author(s):  
Jeremy Bougoure ◽  
Mark Brundrett ◽  
Andrew Brown ◽  
Pauline F. Grierson
Keyword(s):  
Soil Chemistry ◽  
Multivariate Analyses ◽  
Mycorrhizal Fungus ◽  
Habitat Characteristics ◽  
Chemical Characteristics ◽  
Viable Option ◽  
Isolated Populations ◽  
Components Analysis ◽  
Vegetation Characteristics ◽  
Tripartite Relationship

Rhizanthella gardneri R.S.Rogers is an entirely subterranean mycoheterotrophic orchid known only from two isolated populations within south-western Western Australia (WA). This rare species appears restricted to habitats dominated by species of the Melaleuca uncinata complex. R. gardneri purportedly forms a tripartite relationship with Melaleuca1, via a connecting mycorrhizal fungus, for the purpose of carbohydrate and nutrient acquisition. Here, we quantify key climate, soil and vegetation characteristics of known R. gardneri habitats to provide baseline data for monitoring of known R. gardneri populations, to better understand how R. gardneri interacts with its habitat and to identify possible new sites for R. gardneri introduction. We found that the habitats of the two known R. gardneri populations show considerable differences in soil chemistry, Melaleuca structure and Melaleuca productivity. Multivariate analyses showed that both multidimensional scaling (MDS) and principal components analysis (PCA) ordinations of soil chemical characteristics were very similar. Individual sites within populations were relatively similar in all attributes measured, whereas overall northern and southern habitats were distinct from each other. These results suggest that R. gardneri can tolerate a range of conditions and may be more widespread than previously thought, given that there are extensive areas of Melaleuca thickets with similar habitat characteristics across south-western WA. Variability within the habitats of known R. gardneri populations suggests translocation of this species into sites with similar vegetation may be a viable option for the survival of this species.

Kelimpahan Kodok Jam Pasir Leptophryne borbonica di Sepanjang Aliran Sungai Cisuren, Bodogol, Taman Nasional Gunung Gede Pangrango

Jurnal BIOMA ◽  
2014 ◽  
Vol 10 (2) ◽  
pp. 11
Author(s):  
Dhany Ardiansyah ◽  
Arini Karunia ◽  
Talita Auliandina ◽  
Dien Anugerah Putri ◽  
Mohamad Isnin Noer
Keyword(s):  
Abiotic Factors ◽  
Habitat Characteristics ◽  
Chemical Characteristics ◽  
Physical Factors ◽  
Weak Correlation ◽  
Physical Processes ◽  
Natural Factors ◽  
Abundance And Distribution ◽  
Physical And Chemical ◽  
Number Of Individuals

There is high spatial variation in physical and chemical characteristics both within and between streams, some of which has been linked to natural factors. Stream characteristics affect many biological and physical processes. Leptophryne borbonica is stream-dependent toad that spend their life completely in or around stream. The purpose of this study was to determine the effect of habitat characteristics on abundance of Leptophryne borbonica in Bodogol, Sukabumi, West Java. Survey was conducted to obtain data on 27 until 29 June 2013 along Cisuren stream of Bodogol. Parameters that used in this study were conductivity, temperature, humidity, and salinity. The findings showed that all physical factors of stream have weak correlation with the abundance of Leptophryne borbonica. Abiotic factors that forming an ecosystem could affect the abundance and distribution of a amphibians species, because amphibians are sensitive to environmental change. Our result suggested that chemical characteristics along this stream were within the range of fundamental niche of Leptophryne borbonica. However, the slightly different in the number of individuals obtained among plots indicated that there were other factors that may be at play.

A revision of the taxonomy of Dendrelaphis caudolineatus (Gray, 1834) (Serpentes: Colubridae)

Zootaxa ◽  
2012 ◽  
Vol 3272 (1) ◽  
pp. 1 ◽  
Author(s):  
JOHAN VAN ROOIJEN ◽  
GERNOT VOGEL
Keyword(s):  
New Species ◽  
Species Diversity ◽  
Sea Level ◽  
Multivariate Analyses ◽  
The Philippines ◽  
Southeast Asian ◽  
Monophyletic Group ◽  
Philippine Island ◽  
Isolated Populations ◽  
A New Species

The systematics of the wide-ranging southeast Asian colubrid snake Dendrelaphis caudolineatus (Gray, 1834) wasinvestigated on the basis of multivariate analyses of morphological and coloration data for 131 museum specimensrepresenting 28 geographically isolated populations. The results demonstrate that the current taxonomy of D.caudolineatus underestimates species diversity in the Philippines. The following revisions are implemented. 1)Populations from the Philippine island Palawan and adjacent islands currently referred to D. c. caudolineatus (Gray, 1834)are described as a new species, D. levitoni sp. nov. 2) Populations from the Philippine islands Negros, Panay, Mindoroand Masbate, currently assigned to D. c. terrificus (Peters, 1872) and D. c. luzonensis Leviton, 1961 are referred to D.fuliginosus Griffin 1909, which is revalidated. 3) Populations from the southern Philippine islands Basilan, Mindanao,Cebu, Bohol, Leyte, Samar, Polillo, Kalotkot, Catanduanes as well as Southeast Luzon currently referred to D. c. terrificus(Peters, 1872) are referred to D. philippinensis Günther, 1879 which is revalidated. 4) The population from Sulawesi isreferred to D. terrificus (Peters, 1872). Currently regarded as a polytypic species composed of five subspecies, D.caudolineatus is here considered to be a monophyletic group comprising eight species. The distributions of these eightspecies correspond largely with aggregate island complexes formed during periods of reduced sea level during the Pleistocene. However, some deviations indicate post-Pleistocene dispersals across sea barriers.

scholarly journals A preliminary fish survey of the estuaries on the south-east coast of South Africa, Kei Estuary to Mdumbi: A comparative study

Water SA ◽  
2020 ◽  
Vol 46 (3 July) ◽  
Author(s):  
NC James ◽  
TD Harrison
Keyword(s):  
South Africa ◽  
Significant Relationship ◽  
East Coast ◽  
Multivariate Analyses ◽  
Fish Communities ◽  
Chemical Characteristics ◽  
The South ◽  
Physico Chemical ◽  
Biogeographic Region ◽  
Warm Temperate

A preliminary ichthyofaunal and physico-chemical survey of estuaries on the south-east coast of South Africa from the Kei Estuary to the Mdumbi Estuary was undertaken between October and November 1997. Twenty-seven (27) estuaries were surveyed along this stretch of coastline and these were grouped into three estuary types: small (< 10 ha) predominantly closed estuaries, moderate to large (> 10 ha) predominantly closed estuaries and predominantly open estuaries. Multivariate analyses revealed significant differences between predominantly closed estuaries and predominantly open estuaries in terms of both their physico-chemical characteristics and their fish communities. There was no difference between small and moderate to large predominantly closed estuaries.  A significant relationship was also observed between the physico-chemical characteristics of the estuaries and their fish communities.  The estuaries in the study area fall within the warm-temperate biogeographic region; temperate species dominated the fish communities of all the estuaries. This survey represents one of the few fish surveys undertaken along this little-studied section of the coastline. 

scholarly journals Preliminary assessment of habitat characteristics of woodland caribou calving areas in the Claybelt region of Québec and Ontario, Canada

Rangifer ◽  
2003 ◽  
Vol 23 (5) ◽  
pp. 247 ◽  
Author(s):  
Émilie Lantin ◽  
Pierre Drapeau ◽  
Marcel Paré ◽  
Yves Bergeron
Keyword(s):  
Large Scale ◽  
Rangifer Tarandus ◽  
Forest Cover ◽  
Black Spruce ◽  
Spatial Scales ◽  
Habitat Characteristics ◽  
Percent Cover ◽  
Woodland Caribou ◽  
Vegetation Characteristics ◽  
Forest Cover Types

Woodland caribou (Rangifer tarandus caribou) require a diversity of forested habitats over large areas and may thus be particularly affected by the large-scale changes in the composition and age-class distribution of forest landscapes induced by the northern expansion of forest management. In this study we examine habitat characteristics associated to the use of calving areas by woodland caribou females and calves at different spatial scales. Thirty females were captured and collared with Argos satellite transmitters that allowed to locate 14 calving areas. Field surveys were conducted at each of these areas to measure the landscape composition of forest cover types and local vegetation characteristics that are used for both forage conditions and protection cover. At the scale of the calving area, univariate comparisons of the amount of forest cover types between sites with and without calves showed that the presence of calves was associated to mature black spruce forest with a high percent cover of terrestrial lichens. Within calving grounds, univariate comparisons showed that vegetation features like ericaceans and terrestrial lichens, that are important food resources for lactating females, were more abundant in calving areas where females were seen with a calf in mid-July than in areas where females were seen alone. The protection of the vegetation cover against predators was however similar between calving areas with or with&not;out a calf. Logistic regression results also indicated that vegetation characteristics associated to forage conditions were positively associated to calf presence on calving grounds. Our results suggest that foraging conditions should be given more attention in analyses on habitat requirements of woodland caribou.

scholarly journals Long-Term Trend Analysis of Playing Styles in the Chinese Soccer Super League

2021 ◽  
Vol 79 (1) ◽  
pp. 237-247
Author(s):  
Changjing Zhou ◽  
Carlos Lago-Peñas ◽  
Alberto Lorenzo ◽  
Miguel-Ángel Gómez
Keyword(s):  
Multivariate Analyses ◽  
Term Trend ◽  
Performance Factors ◽  
Technical Performance ◽  
Performance Trends ◽  
Period Data ◽  
Components Analysis ◽  
Long Term Trend ◽  
Super League

Abstract The aim of this study was to identify playing styles adopted by teams in the Chinese Soccer Super League (CSL) and to investigate their evolution across a 6-season period. Data were collected from 1,429 CSL matches from 2012 to 2017 seasons using the Amisco system. Seventeen technical performance-related indicators and eleven physical performance-related indicators were included in the factor analysis (PCA: principal components analysis) in order to group them into performance factors (styles of play). Seven factors were obtained (eigenvalues greater than 1) and explained 74.44% of the total variance. Multivariate analyses of covariance (MANCOVA) were used to check differences among seven styles of play (team’s ranking was used as a covariate) during the six seasons under study. The main findings showed that Factor 1 (high intensity play) and factor 3 (offensive actions) of CSL soccer increased substantially along the seasons. Coaches and sports scientists should take into consideration these performance trends when preparing training and controlling for matches

The range and habitat characteristics of the thick-billed grasswren (Amytornis textilis) in the Shark Bay region, Western Australia

2000 ◽  
Vol 27 (3) ◽  
pp. 245 ◽  
Author(s):  
Belinda Brooker
Keyword(s):  
The Other ◽  
Habitat Characteristics ◽  
Disjunct Distribution ◽  
Vegetation Types ◽  
Shark Bay ◽  
The North ◽  
North Eastern ◽  
Nesting Sites ◽  
Foliage Density ◽  
Vegetation Characteristics

The thick-billed grasswren (Amytornis textilis) has a disjunct distribution in the Shark Bay region, with one population confined to Peron Peninsula and the other further inland on Woodleigh Station and the north-eastern corner of Hamelin Station. Grasswrens were found in several vegetation types, including acacia shrublands, Triodia spinifex and the dense vegetation in drainage depressions. Vegetation characteristics that appeared important determinants of grasswren presence were recumbent acacias and low shrubs within the 0–1-m height category, and shrub clumps of high foliage density. These shrub clumps comprised climbers and recumbent low shrubs with interwoven branches, often in association with other plant species. Habitats with this shrub structure may provide the grasswren with ideal nesting sites. The possible effects of grazing and fire on this shrub structure are discussed.

scholarly journals Patterns of habitat selection and use by Macaca mulatta tcheliensis in winter and early spring in temperate forest, Jiyuan, China

Biologia ◽  
2012 ◽  
Vol 67 (1) ◽  
Author(s):  
Dong-Ming Xie ◽  
Ji-Qi Lu ◽  
Alfred Sichilima ◽  
Bai-Shi Wang
Keyword(s):  
Habitat Selection ◽  
Rhesus Macaque ◽  
Macaca Mulatta ◽  
Temperate Forest ◽  
Animal Species ◽  
Rhesus Macaques ◽  
Early Spring ◽  
Habitat Characteristics ◽  
Extrinsic Factors ◽  
Components Analysis

AbstractThe chosen habitat of any animal species comprises a range of environmental features that provide adequate resources for its continuous survival. Consequently, the criteria of habitat selection by animals, combines a wider spectrum of both environmental and extrinsic factors, with major prerequisites based on food resources, availability of shelter and suitable ethics for procreation. From this study, conducted in winter and early spring, at Mt. Wangwushan area, located on 35°05′–35°15′ N, 112°12′–112°22′ E, in Taihangshan Macaque National Nature Reserve (TMNNR), Jiyuan, Henan Province, we show by elaborative results that Macaca mulatta tcheliensis was specifically associated with the following habitat characteristics: (1) the average tree DBH (diameter at breast height) with over 15 cm; (2) the distance from human disturbance of less than 2000 m; (3) the distance to water with less than 1000 m; (4) the gradient of mountain slope of 15°∼40°; (5) which was markedly tarrying with the altitude ranges from 1000 m to 1300 m; and (6) where the canopy coverage was less than 60%. In addition, during this study, rhesus macaque mostly inhabited the sunny slopes of mountains than the shady areas. Results of the first five principal components analysis (PCA) accounted for the total variance of 68.88%, while the other factors showed insignificant effects on habitat selection by rhesus macaque in the temperate forest. In conclusion, these new results increase our understanding on the living status, under the harshest condition, in winter and early spring of Macaca mulatta tcheliensis, the subspecies of rhesus macaques as may be linked to its habitat selection and utilization, in the temperate forest.

MORPHOMETRICAL CHARACTERIZATION OF CYTISUS AND ALLIES (GENISTEAE: LEGUMINOSAE) AS AN AID IN TAXONOMIC DISCRIMINATION

1996 ◽  
Vol 44 (2-3) ◽  
pp. 95-114 ◽  
Author(s):  
Fernando González-Andrés ◽  
Jesús-María Ortiz
Keyword(s):  
Multivariate Analyses ◽  
Intermediate Position ◽  
Adult Plant ◽  
Data Sets ◽  
Data Set ◽  
Operational Taxonomic Units ◽  
Biochemical Studies ◽  
Seed Morphometry ◽  
Components Analysis

Twenty-four accessions belonging to the genus Cytisus and allied taxa were characterized by adult plant morphometry. Twenty-six characters were measured in flowers, 9 in leaves, and 5 in fruits. Two data sets were prepared, the first including only floral parameters and the second with all the parameters. Two different multivariate analyses were carried out for every data set: cluster analysis and principal components analysis. All these studies produced a similar grouping of the operational taxonomic units. Four clear groups were defined: (i) Cytisophyllum sessilifolium; (ii) Cytisus baeticus, C. reverchonii, C. scoparius., (iii) Chamaecytisus species; (iv) Genista species. On the other hand, Cytisus villosus showed an intermediate position between Cytisus and Chamaecytisus, and Cytisus heterochrous and C. purgans an intermediate position between Cytisus and Genista. This grouping agrees with that obtained by other recent seed morphometry and biochemical studies, and supports the generic arrangement presented by Bisby (1981).

Distribution, habitat, and conservation status of the Giant Barred Frog Mixophyes iteratus in the Bungawalbin catchment, northeastern New South Wales

2005 ◽  
Vol 11 (3) ◽  
pp. 189 ◽  
Author(s):  
B. D. Lewis ◽  
D. A. Rohweder
Keyword(s):  
New South ◽  
Conservation Status ◽  
New South Wales ◽  
Habitat Assessment ◽  
Isolated Populations ◽  
South Wales ◽  
Habitat Analysis ◽  
Stream Bank ◽  
Components Analysis ◽  
Habitat Variables

A distribution and habitat assessment was used to determine the conservation status of the Giant Barred Frog Mixophyes iteratus in the Bungawalbin catchment in northeastern New South Wales. Repeated surveys were used to collect presence absence data at 70 sites between January 1997 and March 1999. Giant Barred Frogs were found at 23 sites (33%) comprising five isolated populations which may have contracted from a single remnant population. Habitat analysis revealed frogs showed a significant preference for sites with pool riffle sequences and the presence of undercuts and overhanging vegetation on the primary stream bank. Principal Components Analysis identified five habitat variables that accounted for 73% of the variability in our bi-variate data. We found the level of disturbance to riparian and instream habitats significantly influenced frog distribution, but this trend was not apparent when adjacent habitats outside the riparian zone were analysed. We propose that sedimentation of waterways may have facilitated this decline due to a reduction in the permanency of surface water flows resulting in reduced recruitment opportunities.

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