scholarly journals Relating beta diversity of birds and butterflies in the Great Basin to spatial resolution, environmental variables and trait-based groups

2018 ◽  
Vol 28 (3) ◽  
pp. 328-340 ◽  
Author(s):  
Jian D. L. Yen ◽  
Erica Fleishman ◽  
Frank Fogarty ◽  
David S. Dobkin
Keyword(s):  
Great Basin ◽  
Spatial Resolution ◽  
Beta Diversity ◽  
Environmental Variables

scholarly journals Hydrological and environmental variables outperform spatial factors in structuring species, trait composition, and beta diversity of pelagic algae

2018 ◽  
Vol 8 (5) ◽  
pp. 2947-2961 ◽  
Author(s):  
Naicheng Wu ◽  
Yueming Qu ◽  
Björn Guse ◽  
Kristė Makarevičiūtė ◽  
Szewing To ◽  
...  
Keyword(s):  
Beta Diversity ◽  
Environmental Variables ◽  
Spatial Factors ◽  
Species Trait ◽  
Pelagic Algae

scholarly journals Factors that influence the beta-diversity of spider communities in northwestern Argentinean Grasslands

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e1946 ◽  
Author(s):  
Sandra M. Rodriguez-Artigas ◽  
Rodrigo Ballester ◽  
Jose A. Corronca
Keyword(s):  
Beta Diversity ◽  
Environmental Variables ◽  
Regional Scale ◽  
Geographic Distance ◽  
Species Replacement ◽  
Community Similarity ◽  
Dispersal Capacity ◽  
Assembly Structure ◽  
Dispersion Capacity ◽  
Spider Communities

Beta-diversity, defined as spatial replacement in species composition, is crucial to the understanding of how local communities assemble. These changes can be driven by environmental or geographic factors (such as geographic distance), or a combination of the two. Spiders have been shown to be good indicators of environmental quality. Accordingly, spiders are used in this work as model taxa to establish whether there is a decrease in community similarity that corresponds to geographic distance in the grasslands of the Campos & Malezales ecoregion (Corrientes). Furthermore, the influence of climactic factors and local vegetation heterogeneity (environmental factors) on assemblage composition was evaluated. Finally, this study evaluated whether the differential dispersal capacity of spider families is a factor that influences their community structure at a regional scale. Spiders were collected with a G-Vac from vegetation in six grassland sites in the Campos & Malezales ecoregion that were separated by a minimum of 13 km. With this data, the impact of alpha-diversity and different environmental variables on the beta-diversity of spider communities was analysed. Likewise, the importance of species replacement and nesting on beta-diversity and their contribution to the regional diversity of spider families with different dispersion capacities was evaluated. The regional and site-specific inventories obtained were complete. The similarity between spider communities declined as the geographic distance between sites increased. Environmental variables also influenced community composition; stochastic events and abiotic forces were the principal intervening factors in assembly structure. The differential dispersal capacity of spider groups also influenced community structure at a regional scale. The regional beta-diversity, as well as species replacement, was greater in high and intermediate vagility spiders; while nesting was greater in spiders with low dispersion capacity. Geographic distance, among other factors (climate, and active and passive dispersion capacity), explains assembly structure and the decrease spider community similarity between geographically distant sites. Spiders with the highest dispersal capacity showed greater species replacement. This may be due to the discontinuity (both natural and anthropic) of the grasslands in this ecoregion, which limits the dispersal capacity of these spiders, and their close dependence on microhabitats. The dispersal capacity of the least vagile spiders is limited by geographic distance and biotic factors, such as competition, which could explain the nesting observed between their communities.

scholarly journals Comparison of Landsat and Land-Based Phenology Camera Normalized Difference Vegetation Index (NDVI) for Dominant Plant Communities in the Great Basin

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1139 ◽  
Author(s):  
Keirith Snyder ◽  
Justin Huntington ◽  
Bryce Wehan ◽  
Charles Morton ◽  
Tamzen Stringham
Keyword(s):  
Great Basin ◽  
Plant Communities ◽  
Spatial Resolution ◽  
Temporal Resolution ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Spatial Scales ◽  
Plant Phenology ◽  
High Temporal Resolution ◽  
Spatial Coverage

Phenology of plants is important for ecological interactions. The timing and development of green leaves, plant maturity, and senescence affects biophysical interactions of plants with the environment. In this study we explored the agreement between land-based camera and satellite-based phenology metrics to quantify plant phenology and phenophases dates in five plant community types characteristic of the semi-arid cold desert region of the Great Basin. Three years of data were analyzed. We calculated the Normalized Difference Vegetation Index (NDVI) for both land-based cameras (i.e., phenocams) and Landsat imagery. NDVI from camera images was calculated by taking a standard RGB (red, green, and blue) image and then a near infrared (NIR) plus RGB image. Phenocam NDVI was calculated by extracting the red digital number (DN) and the NIR DN from images taken a few seconds apart. Landsat has a spatial resolution of 30 m2, while phenocam spatial resolution can be analyzed at the single pixel level at the scale of cm2 or area averaged regions can be analyzed with scales up to 1 km2. For this study, phenocam regions of interest were used that approximated the scale of at least one Landsat pixel. In the tall-statured pinyon and juniper woodland sites, there was a lack of agreement in NDVI between phenocam and Landsat NDVI, even after using National Agricultural Imagery Program (NAIP) imagery to account for fractional coverage of pinyon and juniper versus interspace in the phenocam data. Landsat NDVI appeared to be dominated by the signal from the interspace and was insensitive to subtle changes in the pinyon and juniper tree canopy. However, for short-statured sagebrush shrub and meadow communities, there was good agreement between the phenocam and Landsat NDVI as reflected in high Pearson’s correlation coefficients (r > 0.75). Due to greater temporal resolution of the phenocams with images taken daily, versus the 16-day return interval of Landsat, phenocam data provided more utility in determining important phenophase dates: start of season, peak of season, and end of season. More specific species-level information can be obtained with the high temporal resolution of phenocams, but only for a limited number of sites, while Landsat can provide the multi-decadal history and spatial coverage that is unmatched by other platforms. The agreement between Landsat and phenocam NDVI for short-statured plant communities of the Great Basin, shows promise for monitoring landscape and regional-level plant phenology across large areas and time periods, with phenocams providing a more comprehensive understanding of plant phenology at finer spatial scales, and Landsat extending the historical record of observations.

Impoundment, environmental variables and temporal scale predict zooplankton beta diversity patterns in an Amazonian river basin

2021 ◽  
Vol 776 ◽  
pp. 145948
Author(s):  
Carla Albuquerque de Souza ◽  
Beatrix E. Beisner ◽  
Luiz Felipe Machado Velho ◽  
Priscilla de Carvalho ◽  
Alfonso Pineda ◽  
...  
Keyword(s):  
River Basin ◽  
Beta Diversity ◽  
Environmental Variables ◽  
Temporal Scale ◽  
Diversity Patterns

scholarly journals MÉTODOS QUANTITATIVOS PARA MENSURAR A DIVERSIDADE TAXONÔMICA EM PEIXES DE RIACHO

2021 ◽  
Vol 25 (02) ◽  
pp. 398-414
Author(s):  
Naraiana Loureiro Benone ◽  
◽  
Luciano Fogaça de Assis Montag ◽  
Keyword(s):  
Species Diversity ◽  
Beta Diversity ◽  
Environmental Variables ◽  
Large Scale ◽  
Taxonomic Diversity ◽  
Stream Fish ◽  
Diversity Patterns ◽  
The Relationship ◽  
Habitat Variables

Species diversity is defined as the variety of species and their relative abundances, and can be decomposed in local (alpha), regional (gamma) and between-communities (beta) diversity. For decades, studies with Brazilian stream fish focused on the relationship between local environmental variables and diversity patterns. However, dispersal gained notoriety for being important to the organization of communities. Besides, large scale variables are increasingly being perceived as good predictors of diversity, complementing the role of habitat variables. We present here a brief review of the methods to obtain alpha and beta taxonomic diversity, considerations regarding their predictors, and their main analysis.

Modeling and Predicting Species Occurrence Using Broad-Scale Environmental Variables: an Example with Butterflies of the Great Basin

2001 ◽  
Vol 15 (6) ◽  
pp. 1674-1685 ◽  
Author(s):  
Erica Fleishman ◽  
Ralph Mac Nally ◽  
John P. Fay ◽  
Dennis D. Murphy
Keyword(s):  
Great Basin ◽  
Environmental Variables ◽  
Species Occurrence ◽  
Broad Scale

scholarly journals Bacterial community assembly in activated sludge: mapping beta diversity across environmental variables

2016 ◽  
Vol 5 (6) ◽  
pp. 1050-1060 ◽  
Author(s):  
Siavash Isazadeh ◽  
Shameem Jauffur ◽  
Dominic Frigon
Keyword(s):  
Bacterial Community ◽  
Activated Sludge ◽  
Community Assembly ◽  
Beta Diversity ◽  
Environmental Variables

scholarly journals Beta diversity of stream bacteria in Hengduan Mountains: The effects of climatic and environmental variables

2020 ◽  
Vol 28 (12) ◽  
pp. 1570-1580
Author(s):  
Mingjia Li ◽  
Kaiyuan Wu ◽  
Fanfan Meng ◽  
Ji Shen ◽  
Yongqin Liu ◽  
...  
Keyword(s):  
Beta Diversity ◽  
Environmental Variables ◽  
Hengduan Mountains
Sign in / Sign up

Export Citation Format

Share Document