Vegetation patterns within southern Alberta coulees

1986 ◽  
Vol 64 (11) ◽  
pp. 2464-2475 ◽  
Author(s):  
Darwyn S. Coxson ◽  
John Henry H. Looney
Keyword(s):  
Detrended Correspondence Analysis ◽  
Bouteloua Gracilis ◽  
Vegetation Patterns ◽  
Agropyron Smithii ◽  
Plant Associations ◽  
Factors Influencing ◽  
Native Grassland ◽  
Species Analysis ◽  
Southern Alberta ◽  
Study Sites

Native grassland communities located in coulees near Lethbridge, Alberta, were studied to identify the associations present and the environmental factors influencing them. The vegetation along 16 transects was described using point quadrants, with additional study sites analyzed for soil and environmental variables. The data were analyzed using detrended correspondence analysis and indicator species analysis (TWINSPAN) and the results are discussed in relation to recognized plant associations. The primary environmental factor affecting the distribution of these associations is a xeric–mesic gradient, which is discussed in terms of site topography and the physiological requirements of Agropyron smithii and Bouteloua gracilis. A disjunct Festuca scabrella community is recognized and implications of this are discussed.

HABITAT CHARACTERISTICS AND GRASSHOPPER COMMUNITY DYNAMICS ON MIXED-GRASS RANGELAND

1991 ◽  
Vol 123 (1) ◽  
pp. 89-105 ◽  
Author(s):  
Mark A. Quinn ◽  
R.L. Kepner ◽  
D.D. Walgenbach ◽  
R.A. Bohls ◽  
P.D. Pooler ◽  
...  
Keyword(s):  
Community Structure ◽  
Community Dynamics ◽  
Detrended Correspondence Analysis ◽  
Bouteloua Gracilis ◽  
Community Change ◽  
Habitat Characteristics ◽  
Agropyron Smithii ◽  
Spatial Gradients ◽  
Mixed Grass ◽  
The Difference

AbstractA study was conducted in Butte County of western South Dakota to determine the relationships between habitat characteristics and spatial and temporal changes in community structure of grasshoppers on mixed-grass rangeland. Detrended correspondence analysis (DCA) of 29 undisturbed grasshopper communities and correlation analysis of DCA axis values and habitat variables denned specific spatial gradients underlying the community structure of grasshoppers. Results indicated that grasshopper communities changed along a primary gradient of percentage of coverage of grasses, particularly Buchloe dactyloides (Nutt.) Engelm., and a secondary gradient of percentage composition of clay and sand in the soil.DCA of 24 grasshopper communities sampled in 1986 and 1987, multiple regression analysis, and factor analysis were used to determine the relationships between specific habitat characteristics and changes in communities of grasshoppers treated with either a nonselective insecticidal spray (malathion) or a selective insecticidal bait (bran bait with carbaryl). Results indicated that between-year change in community composition, or the difference between post-treatment communities in 1986 and 1987, was positively correlated with percentage of coverage of total grasses and forbs. Community malleability, defined as the tendency of a community to return to its predisturbed state, was greater in habitats with high coverages of Agropyron smithii Rydb. and Carex spp., low coverage of Bouteloua gracilis (H.B.K.) Lag. ex Steud., and low species richness of grasses. Our results emphasize the importance of habitat characteristics in structuring undisturbed grasshopper communities and in community change after perturbation with insecticides.

Vegetation patterns and environmental gradients in coastal meadows on the Yukon–Kuskokwim delta, Alaska

1991 ◽  
Vol 69 (7) ◽  
pp. 1616-1627 ◽  
Author(s):  
Karen L. Kincheloe ◽  
Robert A. Stehn
Keyword(s):  
Plant Communities ◽  
Environmental Variables ◽  
Environmental Gradients ◽  
Vascular Plant ◽  
Detrended Correspondence Analysis ◽  
Vegetation Patterns ◽  
Intertidal Mudflat ◽  
Tundra Vegetation ◽  
Species Analysis ◽  
Coastal Meadows

Tundra vegetation and environmental variables were sampled on the Yukon–Kuskokwim delta in western Alaska. On transects extending from intertidal mudflat to upland tundra, we estimated cover by vascular plant species, soil moisture, salinity, relative elevation, depth to permafrost, and distance upriver from the coast. Two-way indicator species analysis (TWINSPAN) classified 21 communities. Ordination by detrended correspondence analysis (DECORANA) revealed a gradient correlated with the combination of elevation, permafrost depth, and salinity along the first axis for both upriver and downriver transects. Key words: Alaska, ordination, plant communities, salt marsh, tundra, Yukon–Kuskokwim delta.

scholarly journals Vegetation mapping in an area of Ombrophilous Dense Forest at Parque Estadual da Serra do Mar, São Paulo State, Brazil, and floristic composition of the tree component of some physiognomies*

Hoehnea ◽  
2012 ◽  
Vol 39 (2) ◽  
pp. 219-233 ◽  
Author(s):  
Maria Cláudia Melo Pacheco de Medeiros ◽  
Isabel Fernandes de Aguiar Mattos ◽  
Marina Mitsue Kanashiro ◽  
Jorge Yoshio Tamashiro ◽  
Marcos Pereira Marinho Aidar
Keyword(s):  
Riparian Forest ◽  
Detrended Correspondence Analysis ◽  
Floristic Composition ◽  
Field Work ◽  
Aerial Photographs ◽  
Secondary System ◽  
Serra Do Mar ◽  
Dense Forest ◽  
Species Analysis ◽  
Tree Component

This study aimed to map phytophysiognomies of an area of Ombrophilous Dense Forest at Parque Estadual da Serra do Mar and characterize their floristic composition. Photointerpretation of aerial photographs in scale of 1:35,000 was realized in association with field work. Thirteen physiognomies were mapped and they were classified as Montane Ombrophilous Dense Forest, Alluvial Ombrophilous Dense Forest or Secondary System. Three physiognomies identified at Casa de Pedra streamlet's basin were studied with more details. Riparian forest (RF), valley forest (VF), and hill forest (HF) presented some floristic distinction, as confirmed by Detrended Correspondence Analysis (DCA) and Indicator Species Analysis (ISA) conducted here. Anthropic or natural disturbances and heterogeneity of environmental conditions may be the causes of physiognomic variation in the vegetation of the region. The results presented here may be useful to decisions related to management and conservation of Núcleo Santa Virgínia forests, in general.

scholarly journals Comparison of beach profiles conducive for turtle nesting in Andaman

2018 ◽  
Vol 10 (10) ◽  
pp. 12337-12343
Author(s):  
Subramanian Narayani ◽  
Sasidharan Venu ◽  
Andrea Joan D'Silva
Keyword(s):  
Anthropogenic Activities ◽  
Slope Angle ◽  
Vegetation Patterns ◽  
Long Beach ◽  
Single Factor ◽  
High Slope ◽  
Beach Slope ◽  
Nesting Site ◽  
Nesting Sites ◽  
Study Sites

The present study was undertaken to compare beach characteristics associated with turtle nesting in the Andaman group of islands.  Karmatang, Kalipur, Ramnagar, Chidiyatapu, Carbyn’s Cove, and Wandoor were chosen as study sites.  Beach slope, sand grain characteristics, and general vegetation patterns were analysed.  The angle of inclination of the beach slope ranged from 2.06 to 8.3 degrees.  Beaches with a higher angle had a comparatively higher number of nesting sites.  The study shows that a single factor does not make a beach more conducive for nesting.  Chidiyatapu has the widest beach but lacks other features and so it is not a preferred nesting site.  The grain size of sand in Wandoor is highly favourable, but the intertidal region is not long and there are streams that can drown the nests.  Karmatang has a long beach and a higher slope angle.  Ramnagar has a moderate beach length and a high slope angle.  The dominant grains at both the beaches were found to be granules.  The absence of streams and artificial light, fewer number of anthropogenic activities, lack of obstacles, the presence of bordering vegetation, and a conducive beach slope with granular sand grains make Ramnagar, Karmatang, and Kalipur ideal for turtle nesting.

scholarly journals A vegetation survey of the Tsitsikamma Coastal National Park

Koedoe ◽  
1989 ◽  
Vol 32 (1) ◽  
Author(s):  
N. Hanekom ◽  
A. Southwood ◽  
M. Ferguson
Keyword(s):  
Correspondence Analysis ◽  
Indicator Species ◽  
National Park ◽  
Detrended Correspondence Analysis ◽  
Indicator Species Analysis ◽  
Vegetation Survey ◽  
Afromontane Forest ◽  
Species Analysis ◽  
North And South

Sampling plots (5 m x 10 m in fynbos, 10 m x 10 m in forest) were analysed in the littoral, coastal escarpment, and north and south facing inland escarp- ment zones of 17 transect sites along the length of the Tsitsikamma Coastal National Park. Cover- abundance values were estimated for each species in the sampling plots. A detrended correspondence analysis (using CANOCO) and a two way indicator species analysis (TWINSPAN) were carried out on these data to determine the communities sampled. The vegetation of the park was classified into an Afromontane Forest, a Littoral Herbland and two Mesic Mountain Fynbos Communities. The distribution and extent of these communities were determined and their conservation discussed.

Vegetation patterns in James Bay coastal marshes. III. Salinity and elevation as factors influencing plant zonations

1989 ◽  
Vol 67 (10) ◽  
pp. 2967-2974 ◽  
Author(s):  
J. C. Earle ◽  
K. A. Kershaw
Keyword(s):  
Salt Marsh ◽  
Salinity Gradient ◽  
Detrended Correspondence Analysis ◽  
Distribution Patterns ◽  
Environmental Data ◽  
Plant Distribution ◽  
Coastal Marsh ◽  
James Bay ◽  
Factors Influencing ◽  
Community Types

Plant zonations and selected environmental variables were studied in a subarctic coastal marsh at Ekwan Point, James Bay, Ont. Eight distinct community types were identified using two-way indicator species analysis classification (TWINSPAN). These were interpreted as a primary successional sequence. The eight communities were found to conform closely to the classical marsh zonations based on elevation and tidal influence: (1) lower salt marsh, (2) middle salt marsh, (3) upper salt marsh, (4) saline meadow, (5) freshwater meadow, and (6) freshwater fen. Environmental data collected along the vegetation transects indicated that changes in elevation and soil-water salinity probably influence species distributions. A species ordination using detrended correspondence analysis (DECORANA) revealed several trends in plant distribution patterns. Consideration of the environmental affinities of species separated along three ordination axes suggested that salinity and elevation, water content, and soil texture were probably important factors influencing successional processes in the marsh during at least the last century. An inverse salinity gradient, which has been reported at many sites along the west coast of Hudson and James bays, was not found at Ekwan Point.

scholarly journals Mountain pastures of Qilian Shan: plant communities, grazing impact and degradation status (Gansu province, NW China)

Hacquetia ◽  
2016 ◽  
Vol 15 (2) ◽  
pp. 21-35 ◽  
Author(s):  
Alina Baranova ◽  
Udo Schickhoff ◽  
Shunli Wang ◽  
Ming Jin
Keyword(s):  
Plant Community ◽  
Plant Communities ◽  
Plant Cover ◽  
Management Strategies ◽  
Detrended Correspondence Analysis ◽  
Gansu Province ◽  
Grazing Impact ◽  
Vegetation Patterns ◽  
Pasture Management ◽  
Nw China

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.

Functional diversity and seasonal activity of dung beetles (Coleoptera: Scarabaeoidea) on native grasslands in southern Alberta, Canada

2013 ◽  
Vol 146 (3) ◽  
pp. 291-305 ◽  
Author(s):  
N. Kadiri ◽  
J.-P. Lumaret ◽  
K.D. Floate
Keyword(s):  
Functional Diversity ◽  
Life History Traits ◽  
Dung Beetles ◽  
Total Biomass ◽  
Seasonal Activity ◽  
European Origin ◽  
Core Species ◽  
Native Grasslands ◽  
Native Grassland ◽  
Southern Alberta

AbstractTo characterise their functional diversity and seasonal activity, dung beetles (Coleoptera: Scarabaeoidea) were collected with baited pitfall traps at three sites for three years on a native grassland in southern Alberta, Canada. The total collection of 125 820 beetles comprised 12 species of which eight were of European origin. For each combination of site and year, assemblages were dominated by two or three core species of European origin that represented 70–95% of total beetles and more than 75% of total biomass, but only 10–30% of species richness. Core species consistently includedOnthophagus nuchicornis(Linnaeus) and occasionallyChilothorax distinctus(Müller) andColobopterus erraticus(Linnaeus). Coexistence of these core species appears to be facilitated by differences in their size, seasonal activity, and life history traits.

An Assessment of the Sampling Procedure for Estimating air Pollution Using Epiphytic Lichens as Indicators

1993 ◽  
Vol 25 (2) ◽  
pp. 165-173 ◽  
Author(s):  
S. A. Pirintsos ◽  
D. Vokou ◽  
J. Diamantopoulos ◽  
D. J. Galloway
Keyword(s):  
Air Pollution ◽  
Detrended Correspondence Analysis ◽  
Pollution Source ◽  
Sampling Procedure ◽  
Epiphytic Lichens ◽  
Indicator Species Analysis ◽  
Experimental Site ◽  
Breast Height ◽  
Species Analysis ◽  
The City

AbstractUsing the response of epiphytic lichens in and around the city of Thessaloniki (Greece) to an air pollution source, the value of sampling lichens at breast height and the base of trees was compared. The data obtained were processed with detrended correspondence analysis and polythetic divisive two-way indicator species analysis, and IAP (index of atmospheric purity) values were estimated for each experimental site. The tree base IAP values were higher than those at breast height, reflecting the higher number of species present, the generally increased cover and frequency of occurrence. IAP values at the two sampling heights suggest a linear relationship and the same holds for the tree base IAP values and the first axis ordination scores. Sampling at the base resulted in better discrimination of sites, and may, therefore, offer more accurate monitoring of changes induced by air pollution.

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