Disentangling the effects of propagule supply and environmental filtering on the spatial structure of a rocky shore metacommunity

2015 ◽  
Vol 538 ◽  
pp. 67-79 ◽  
Author(s):  
N Valdivia ◽  
MA Aguilera ◽  
SA Navarrete ◽  
BR Broitman
Keyword(s):  
Spatial Structure ◽  
Rocky Shore ◽  
Environmental Filtering ◽  
Propagule Supply

scholarly journals Disentangling the role of connectivity, environmental filtering, and spatial structure on metacommunity dynamics

Oikos ◽  
2013 ◽  
pp. no-no ◽  
Author(s):  
C. Moritz ◽  
C. N. Meynard ◽  
V. Devictor ◽  
K. Guizien ◽  
C. Labrune ◽  
...  
Keyword(s):  
Spatial Structure ◽  
Environmental Filtering ◽  
Metacommunity Dynamics

scholarly journals Spatial and phylogenetic structure of Alpine stonefly community assemblages across seven habitats using DNA-species

2019 ◽  
Author(s):  
Maribet Gamboa ◽  
Joeselle Serrana ◽  
Yasuhiro Takemon ◽  
Michael T. Monaghan ◽  
Kozo Watanabe
Keyword(s):  
Species Diversity ◽  
Spatial Structure ◽  
Habitat Heterogeneity ◽  
Species Coexistence ◽  
Species Turnover ◽  
Phylogenetic Signal ◽  
Gene Tree ◽  
Environmental Filtering ◽  
List Type ◽  
Phylogenetic Structure

AbstractStream ecosystems are spatially heterogeneous, with many different habitat patches distributed within a small area. The influence of this heterogeneity on the biodiversity of benthic insect communities is well documented; however, studies of the role of habitat heterogeneity in species coexistence and community assembly remain limited. Here, we asked how habitat heterogeneity influences spatial structure (beta biodiversity) and phylogenetic structure (evolutionary processes) of benthic stonefly (Plecoptera, Insecta) communities.We sampled 20 sites along two Alpine rivers, including seven habitats in four different reaches (headwaters, meandering, bar-braided floodplain, and lowland spring-fed). We identified 21 morphological species and delineated 52 DNA-species based on sequences from mitochondrial cox1 and nuclear ITS markers. Using DNA-species, we first analysed the patterns of variation in richness, diversity, and composition by quantifing the contribution of each of the four reaches and seven habitats to the overall DNA-species diversity using an additive partition of species diversity analysis and distance-based redundancy analysis. Using gene-tree phylogenies, we assessed whether environmental filtering led to the co-occurrence of DNA-species using a two-step analysis to find a phylogenetic signal.The four reaches significantly contributed to DNA-species richness; with the meandering section displaying the highest contribution. However, we found that habitats had an effect on DNA-species diversity, where glide, riffle, and pool influenced the spatial structure of stonefly communities possibly due to a high species turnover.Among the habitats, the pool showed significant phylogenetic clustering, suggesting high levels of evolutionary adaptation and strong habitat filtering. This community structure may be caused by long-term stability of the habitat and the similar requirements for co-ocurring species.Our study shows the importance of different habitats on the spatial and phylogenetic structure of stonefly community assemblies and sheds light on the habitat-specific diversity that may help improve conservation practices.

Observations of the spatial structure of interstellar hydrogen

1967 ◽  
Vol 31 ◽  
pp. 45-46
Author(s):  
Carl Heiles
Keyword(s):  
High Resolution ◽  
Spatial Structure ◽  
Velocity Dispersion ◽  
Temperature Variations

High-resolution 21-cm line observations in a region aroundlII= 120°,b11= +15°, have revealed four types of structure in the interstellar hydrogen: a smooth background, large sheets of density 2 atoms cm-3, clouds occurring mostly in groups, and ‘Cloudlets’ of a few solar masses and a few parsecs in size; the velocity dispersion in the Cloudlets is only 1 km/sec. Strong temperature variations in the gas are in evidence.

Results of Spatial Structure of Atmosphere Radiation in a Spectral Range (1.5–2) µm Research

2018 ◽  
pp. 7-13
Author(s):  
Anton M. Mishchenko ◽  
Sergei S. Rachkovsky ◽  
Vladimir A. Smolin ◽  
Igor V . Yakimenko
Keyword(s):  
Spatial Structure ◽  
Unmanned Aerial Vehicle ◽  
Wavelength Range ◽  
Spectral Range ◽  
Near Ir ◽  
Optoelectronic Systems ◽  
Aerial Vehicle

Results of experimental studying radiation spatial structure of atmosphere background nonuniformities and of an unmanned aerial vehicle being the detection object are presented. The question on a possibility of its detection using optoelectronic systems against the background of a cloudy field in the near IR wavelength range is also considered.

Microbial biodiversity along Purnagad rocky shore, Ratnagiri

2011 ◽  
Vol 4 (8) ◽  
pp. 685-687
Author(s):  
Dr. Chanda V Berde ◽  
◽  
Archana S Injal ◽  
Dr. Vikrant B Berde ◽  
Dr. Arvind S Kulkarni
Keyword(s):  
Rocky Shore ◽  
Microbial Biodiversity

Niche Sharing in Intertidal Mollusks and Decapods in Rocky Shore of Easter Island

2019 ◽  
Vol 53 (5) ◽  
pp. 417-422
Author(s):  
P. De los Ríos ◽  
E. Ibáñez Arancibia
Keyword(s):  
Spatial Distribution ◽  
Negative Binomial Distribution ◽  
Binomial Distribution ◽  
Rocky Shore ◽  
Negative Binomial ◽  
Null Model ◽  
Easter Island ◽  
Published Data ◽  
Distribution Analysis ◽  
Field Works

Abstract The coastal marine ecosystems in Easter Island have been poorly studied, and the main studies were isolated species records based on scientific expeditions. The aim of the present study is to apply a spatial distribution analysis and niche sharing null model in published data on intertidal marine gastropods and decapods in rocky shore in Easter Island based in field works in 2010, and published information from CIMAR cruiser in 2004. The field data revealed the presence of decapods Planes minutus (Linnaeus, 1758) and Leptograpsus variegatus (Fabricius, 1793), whereas it was observed the gastropods Nodilittorina pyramidalis pascua Rosewater, 1970 and Nerita morio (G. B. Sowerby I., 1833). The available information revealed the presence of more species in data collected in 2004 in comparison to data collected in 2010, with one species markedly dominant in comparison to the other species. The spatial distribution of species reported in field works revealed that P. minutus and N. morio have aggregated pattern and negative binomial distribution, L. variegatus had uniform pattern with binomial distribution, and finally N. pyramidalis pascua, in spite of aggregated distribution pattern, had not negative binomial distribution. Finally, the results of null model revealed that the species reported did not share ecological niche due to competition absence. The results would agree with other similar information about littoral and sub-littoral fauna for Easter Island.

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