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 A global database for metacommunity ecology, integrating species, traits, environment and space

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Alienor Jeliazkov ◽  
Darko Mijatovic ◽  
Stéphane Chantepie ◽  
Nigel Andrew ◽  
Raphaël Arlettaz ◽  
...  
Keyword(s):  
Environmental Variables ◽  
Environmental Changes ◽  
Spatial Scales ◽  
Species Traits ◽  
Global Database ◽  
Metacommunity Ecology ◽  
Species Trait ◽  
Spatial Coordinates ◽  
Taxonomic Groups ◽  
Case Basis

AbstractThe use of functional information in the form of species traits plays an important role in explaining biodiversity patterns and responses to environmental changes. Although relationships between species composition, their traits, and the environment have been extensively studied on a case-by-case basis, results are variable, and it remains unclear how generalizable these relationships are across ecosystems, taxa and spatial scales. To address this gap, we collated 80 datasets from trait-based studies into a global database for metaCommunity Ecology: Species, Traits, Environment and Space; “CESTES”. Each dataset includes four matrices: species community abundances or presences/absences across multiple sites, species trait information, environmental variables and spatial coordinates of the sampling sites. The CESTES database is a live database: it will be maintained and expanded in the future as new datasets become available. By its harmonized structure, and the diversity of ecosystem types, taxonomic groups, and spatial scales it covers, the CESTES database provides an important opportunity for synthetic trait-based research in community ecology.

scholarly journals The Simultaneous Effects of Spatial and Social Networks on Cholera Transmission

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Sophia Giebultowicz ◽  
Mohammad Ali ◽  
Mohammad Yunus ◽  
Michael Emch
Keyword(s):  
Social Networks ◽  
Social Network ◽  
Disease Transmission ◽  
Environmental Variables ◽  
Social Effects ◽  
Spatial Error ◽  
Spatial Factors ◽  
Rural Bangladesh ◽  
Recent Approach ◽  
Health Studies

This study uses social network and spatial analytical methods simultaneously to understand cholera transmission in rural Bangladesh. Both have been used separately to incorporate context into health studies, but using them together is a new and recent approach. Data include a spatially referenced longitudinal demographic database consisting of approximately 200,000 people and a database of all laboratory-confirmed cholera cases from 1983 to 2003. A complete kinship-based network linking households is created, and distance matrices are also constructed to model spatial relationships. A spatial error-social effects model tested for cholera clustering in socially linked households while accounting for spatial factors. Results show that there was social clustering in five out of twenty-one years while accounting for both known and unknown environmental variables. This suggests that environmental cholera transmission is significant and social networks also influence transmission, but not as consistently. Simultaneous spatial and social network analysis may improve understanding of disease transmission.

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 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

Beta diversity of rock-restricted cichlid fishes in Lake Malawi: importance of environmental and spatial factors

Ecography ◽  
2004 ◽  
Vol 27 (5) ◽  
pp. 601-610 ◽  
Author(s):  
M. J. Genner ◽  
M. I. Taylor ◽  
D. F. R. Cleary ◽  
S. J. Hawkins ◽  
M. E. Knight ◽  
...  
Keyword(s):  
Beta Diversity ◽  
Lake Malawi ◽  
Spatial Factors ◽  
Cichlid Fishes

scholarly journals Spatial Factors Play a Major Role as Determinants of Endemic Ground Beetle Beta Diversity of Madeira Island Laurisilva

PLoS ONE ◽  
2013 ◽  
Vol 8 (5) ◽  
pp. e64591 ◽  
Author(s):  
Mário Boieiro ◽  
José C. Carvalho ◽  
Pedro Cardoso ◽  
Carlos A. S. Aguiar ◽  
Carla Rego ◽  
...  
Keyword(s):  
Beta Diversity ◽  
Ground Beetle ◽  
Spatial Factors ◽  
Madeira Island

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 Effect of environmental and spatial factors on small-sized fish assemblages in a tropical river

2021 ◽  
Vol 51 (2) ◽  
pp. 129-138
Author(s):  
Izaias Médice FERNANDES ◽  
Katiele de Jesus SACOMAN ◽  
José Paulo de FARIAS-NETO ◽  
Hugmar Pains da SILVA ◽  
Jhony VENDRUSCOLO ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Species Richness ◽  
Species Composition ◽  
Environmental Variables ◽  
Fish Assemblages ◽  
Negative Relationship ◽  
Dispersal Limitation ◽  
River Continuum ◽  
Spatial Factors ◽  
Water Characteristics

ABSTRACT The river continuum concept predicts that gradual changes in river geomorphology and hydrology can drive longitudinal changes in aquatic community structure. Accordingly, we evaluated how environmental variables (electrical conductivity, pH, water transparency and water velocity), spatial factors (distance from headwaters and Moran’s eigen vector maps - MEMs), and the presence of dams affect small-sized fish assemblages along a 105-km stretch of the upper Branco River, a tributary in the Madeira River, Amazonas Basin, Brazil. Seine-net based collections were carried out at 15 sites up- and downriver from dams during the 2019 dry season. We captured a total of 4,330 individual fish belonging to three orders, nine families and 26 species (and a hybrid individual). Electrical conductivity and pH were affected by the presence of dams and the distance from headwaters. Species richness and abundance did not vary in response to environmental variables. While species richness showed no significant variation along the sampled river section, abundance showed a negative relationship with distance from headwaters. Species composition varied significantly in response to pH, linear spatial factors and the presence of dams. Our results suggest that change in species composition of small-sized fish assemblages in the upper Branco River occurs due to variation in water characteristics, inherent dispersal limitation, and in response to the presence of dams.

Environmental and spatial factors affect the composition and morphology of tadpole assemblages

2018 ◽  
Vol 96 (10) ◽  
pp. 1130-1136
Author(s):  
N.C.S. Marques ◽  
F. Nomura
Keyword(s):  
Environmental Factors ◽  
Morphological Variation ◽  
Environmental Conditions ◽  
Environmental Variables ◽  
Morphological Diversity ◽  
Oviposition Site ◽  
Spatial Factors ◽  
Assemblage Composition ◽  
Different Types ◽  
Spatial Coordinates

Understanding how community compositions are affected by environmental and spatial factors are essential to provide knowledge about the distributions of species. Furthermore, these factors can play a role in species morphological variation. Tadpoles can be found in different types of aquatic microhabitats, showing a considerable amount of morphological diversity. We hypothesized that tadpole morphological diversity is controlled by ecological and spatial factors other than assemblage attributes, and that tadpole assemblage composition is affected by spatial factors. To test these hypotheses, we recorded the abundance of tadpoles from different ponds, identified eight environmental variables that represented local and landscape descriptors of the ponds, recorded the spatial coordinates of the ponds, and measured the morphological variation of assemblages. Spatial factors significantly affected the composition of tadpole assemblages, while both spatial and environmental factors affected morphological variation. The ability of tadpoles to alter their morphology in response to environmental factors might be a result of poor oviposition site choice, and this probably interacts with spatial factors to control the assemblage composition of tadpoles. Morphological variation is advantageous for tadpoles because it allows them to adjust their morphology to environmental conditions. This study has demonstrated how factors that control the assemblage composition of tadpoles also drive their morphological diversity.

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.

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