The Changes Related with Altitudinal Gradient and Seasonal Variation in the Species Composition of Carabidae (Coleoptera) in Türkmen Mountain (Eskisehir, Turkey)

Ekoloji ◽  
2016 ◽  
pp. 17-24 ◽  
Author(s):  
Êbru Ceren Fidan ◽  
Umit Sirin
Keyword(s):  
Seasonal Variation ◽  
Species Composition ◽  
Altitudinal Gradient

Distribution of moss-inhabiting diatoms along an altitudinal gradient at sub-Antarctic Îles Kerguelen

2007 ◽  
Vol 19 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Niek J.M. Gremmen ◽  
Bart van de Vijver ◽  
Yves Frenot ◽  
Marc Lebouvier
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Altitudinal Gradient ◽  
Cross Validation ◽  
Strong Relationship ◽  
Distribution Patterns ◽  
Common Species ◽  
Important Variable ◽  
Diatom Species ◽  
Expected Species Richness

Altitudinal gradients provide excellent opportunities to study relationships between species distribution and climatic variables. We studied the species composition of 39 samples of moss-inhabiting diatoms, collected at 50 m intervals from 100–650 m above sea level. The samples contained a total of 130 diatom species, of which 51 occurred in 10 or more samples. Altitude appeared to be the most important variable explaining variation in species composition. Of the 51 common species, 33 showed a significant relationship with altitude. Although the majority of the latter declined with increasing altitude, for nine species the probability of occurrence first increased with increasing elevation, but decreased again at higher altitudes, and four species increased systematically with elevation. As a result, expected species richness per sample decreased from an estimated 43 at 100 m to 25 species per sample at 650 m. Diatom distribution patterns proved to be suitable predictors of the altitudinal position of sample sites. Cross-validation yielded a strong relationship between predicted and observed altitudes.

Seasonal variation in soil seed bank size and species composition of selected habitat types in Maputaland, South Africa

Bothalia ◽  
2007 ◽  
Vol 37 (2) ◽  
pp. 249-258 ◽  
Author(s):  
M. J. S. Kellerman ◽  
M. W. Van Rooyen
Keyword(s):  
South Africa ◽  
Seasonal Variation ◽  
Species Composition ◽  
Seed Bank ◽  
Soil Seed Bank ◽  
Woody Species ◽  
Forest Edge ◽  
Seed Banks ◽  
Habitat Types ◽  
Open Woodland

Seasonal variation in seed bank size and species composition of five selected habitat types within the Tembe Elephant Park. South Africa, was investigated. At three-month intervals, soil samples were randomly collected from five different habitat types: a, Licuati forest; b, Licuati thicket; c, a bare or sparsely vegetated zone surrounding the forest edge, referred to as the forest/grassland ecotone; d, grassland; and e, open woodland. Most species in the seed bank flora were either grasses, sedges, or forbs, with hardly any evidence of woody species. The Licuati forest and thicket soils produced the lowest seed densities in all seasons.  Licuati forest and grassland seed banks showed a two-fold seasonal variation in size, those of the Licuati thicket and woodland a three-fold variation in size, whereas the forest/grassland ecotone maintained a relatively large seed bank all year round. The woodland seed bank had the highest species richness, whereas the Licuati forest and thicket soils were poor in species. Generally, it was found that the greatest correspondence in species composition was between the Licuati forest and thicket, as well as the forest/grassland ecotone and grassland seed bank floras.

scholarly journals Seasonal Variation in Plant Species in the Vicinities of Chimdi Lake in Sunsari, Nepal

Our Nature ◽  
1970 ◽  
Vol 8 (1) ◽  
pp. 157-163
Author(s):  
T.N. Mandal ◽  
K.K.C. Poudel ◽  
T.P. Gautam
Keyword(s):  
Seasonal Variation ◽  
Species Composition ◽  
Plant Species ◽  
Lake Area ◽  
Plant Species Composition

The plant species composition of the Chimdi lake area showed seasonal variation. Altogether 54 plant species under 21 families, 41 plant species under 19 families and 29 plants species under 14 families have been recorded in summer, rainy and winter seasons respectively. Dominant families were Poaceae 22.2%, Cyperaceae 24.4% and again Poaceae 31% in the above respective seasons. The dicot and monocot members were maximum in the summer and minimum in the winter.DOI: 10.3126/on.v8i1.4323

Influence of Chemical Diversity in Determining Lichen Communities Structure along an Altitudinal Gradient in the Chopta Tungnath, Western Himalaya

2017 ◽  
Vol 3 (01) ◽  
pp. 07-13
Author(s):  
Vertika Shukla ◽  
Rajesh Bajpai ◽  
Manoj Semwal ◽  
D. K. Upreti
Keyword(s):  
Species Diversity ◽  
Secondary Metabolites ◽  
Species Composition ◽  
Altitudinal Gradient ◽  
Western Himalaya ◽  
Chemical Diversity ◽  
Lichen Diversity ◽  
Lichen Community ◽  
High Precipitation

In recent years there has been growing interest in the study on lichen diversity with relation to altitudinal gradient and anthropogenic disturbances , as changes in lichen community composition may indicate air quality and microclimatic changes. The altitudinal data of species diversity and its subsequent changes with respect to time and space may provide vital information regarding impact of air pollution and/or climate change at regional or global scales. Chopta-Tungnath and adjoining areas of Garhwal Himalaya provide habitat and ecological variation with range of altitude lying between 300 to 3000 m. Out of the 116 species of lichens known from the studied area, the highest species diversity was observed between altitudes 1800 to 2100 m. Lichen communities occurring between 600–1800 m were dominated by members of Physciaceae, while Parmeliaceae were most common above 1800 m. Altitude beyond 2100 m experiences high precipitation, varying temperature conditions and increased incident UV radiation, which are responsible for controlling the variability in lichen diversity to a great extent in the region. The diversity of secondary metabolites in lichen species and consequent changes in species composition at various altitudes indicate the association of secondary chemicals in conferring the lichens resistance to biotic and abiotic stresses. The correlations of lichen diversity, secondary metabolites and the altitudes at which the lichens are growing, present suggestive role of secondary metabolites in determining species composition and sustainability in different environmental conditions.

Sign in / Sign up

Export Citation Format

Share Document