scholarly journals Submesoscale physicochemical dynamics directly shape bacterioplankton community structure in space and time

2021 ◽  
Author(s):  
Eduard Fadeev ◽  
Matthias Wietz ◽  
Wilken‐Jon von Appen ◽  
Morten H. Iversen ◽  
Eva‐Maria Nöthig ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterioplankton Community ◽  
Space And Time

scholarly journals Changes in the Bacterioplankton Community Structure from Southern Gulf of Mexico During a Simulated Crude Oil Spill at Mesocosm Scale

2019 ◽  
Vol 7 (10) ◽  
pp. 441 ◽  
Author(s):  
Sonia S. Valencia-Agami ◽  
Daniel Cerqueda-García ◽  
Sébastien Putzeys ◽  
María Magdalena Uribe-Flores ◽  
Norberto Ulises García-Cruz ◽  
...  
Keyword(s):  
Community Structure ◽  
Gulf Of Mexico ◽  
Crude Oil ◽  
Oil Spill ◽  
Initial Time ◽  
P Value ◽  
Sequencing Analysis ◽  
Hydrocarbonoclastic Bacteria ◽  
Bacterioplankton Community ◽  
Southern Gulf Of Mexico

The southern Gulf of Mexico (sGoM) is highly susceptible to receiving environmental impacts due to the recent increase in oil-related activities. In this study, we assessed the changes in the bacterioplankton community structure caused by a simulated oil spill at mesocosms scale. The 16S rRNA gene sequencing analysis indicated that the initial bacterial community was mainly represented by Gamma-proteobacteria, Alpha-proteobacteria, Flavobacteriia, and Cyanobacteria. The hydrocarbon degradation activity, measured as the number of culturable hydrocarbonoclastic bacteria (CHB) and by the copy number of the alkB gene, was relatively low at the beginning of the experiment. However, after four days, the hydrocarbonoclastic activity reached its maximum values and was accompanied by increases in the relative abundance of the well-known hydrocarbonoclastic Alteromonas. At the end of the experiment, the diversity was restored to similar values as those observed in the initial time, although the community structure and composition were clearly different, where Marivita, Pseudohongiella, and Oleibacter were detected to have differential abundances on days eight–14. These changes were related with total nitrogen (p value = 0.030 and r2 = 0.22) and polycyclic aromatic hydrocarbons (p value = 0.048 and r2 = 0.25), according to PERMANOVA. The results of this study contribute to the understanding of the potential response of the bacterioplankton from sGoM to crude oil spills.

scholarly journals Disentangling metacommunity processes using multiple metrics in space and time

2020 ◽  
Author(s):  
Laura Melissa Guzman ◽  
Patrick L. Thompson ◽  
Duarte S Viana ◽  
Bram Vanschoenwinkel ◽  
Zsófia Horváth ◽  
...  
Keyword(s):  
Community Structure ◽  
Community Dynamics ◽  
Variation Partitioning ◽  
Species Abundance ◽  
Emergent Properties ◽  
Sampling Effort ◽  
Summary Statistics ◽  
Space And Time ◽  
Metacommunity Dynamics ◽  
Analytical Approaches

AbstractMetacommunity ecology has focused on using observational and analytical approaches to disentangle the role of critical assembly processes, such as dispersal limitation and environmental filtering. Many methods have been proposed for this purpose, most notably multivariate analyses of species abundance and its association with variation in spatial and environmental conditions. These approaches tend to focus on few emergent properties of metacommunities and have largely ignored temporal community dynamics. By doing so, these are limited in their ability to differentiate metacommunity dynamics. Here, we develop a Virtual ecologist’ approach to evaluate critical metacommunity assembly processes based on a number of summary statistics of community structure across space and time. Specifically, we first simulate metacommunities emphasizing three main processes that underlie metacommunity dynamics (density-independent responses to abiotic conditions, density-dependent biotic interactions, and dispersal). We then calculate a number of commonly used summary statistics of community structure in space and time, and use random forests to evaluate their utility for understanding the strength of these three processes. We found that: (i) time series are necessary to disentangle metacommunity processes, (ii) each of the three studied processes is distinguished with different descriptors, (iii) each summary statistic is differently sensitive to temporal and spatial sampling effort. Some of the most useful statistics include the coefficient of variation of abundances through time and metrics that incorporate variation in the relative abundances (evenness) of species. Surprisingly, we found that when we only used a single snapshot of community variation in space, the most commonly used approaches based on variation partitioning were largely uninformative regarding assembly processes, particularly, variation in dispersal. We conclude that a combination of methods and summary statistics will be necessary to understand the processes that underlie metacommunity assembly through space and time.

scholarly journals Spatial and Temporal Variation of Fish Assemblages in Seti Gandaki River, Tanahu, Nepal

2020 ◽  
Vol 10 (2) ◽  
pp. 93-104
Author(s):  
ARCHANA PRASAD ◽  
ANJANA SHRESTHA ◽  
JASH HANG LIMBU ◽  
DEEP SWAR
Keyword(s):  
Community Structure ◽  
Fish Community ◽  
Fish Assemblages ◽  
Mesh Size ◽  
Spatial And Temporal Variation ◽  
Total Hardness ◽  
Medium Size ◽  
Fish Community Structure ◽  
Space And Time ◽  
Significant Difference

The space and time variations of the fish community structure in hill streams of Nepal are poorly understood. This research aims at studying the space and time variation of fish community structure in the Seti Gandaki River, Tanahu, Nepal. The field survey was conducted from July 2017 to June 2018 and the fishes were sampled from six sites using a medium size cast net of mesh size ranging from 3 mm to 6 mm mesh size, 25-33 feet length and 3.5-5 feet width, with the help of local fisher man. A total of 1,440 individuals were caught representing 46 species belonging to three order, nine families and 23 genera. The analysis of similarity (ANOSIM) showed significant difference in space (R = 0.824, P = 0.001) but not in time (R = 0.135, P = 0.021). On the basis of similarity percentage (SIMPER) analysis, 85.43% similarity was found among the seasons and major contributing species were Barilius bendelisis (8.44%) followed by B. vagra (7.79%), Tor putitora (7.27%), Garra gotyla (7%), Acanthocobotis botia (6.7%), Neolissochilus hexagonolepis (6.64%), Barilius shacra (6%), B. barila (4.5%) and Opsarius barna (4.37%). On the other hand, 85.24% similarity was found among the sites and major contributing species were B. bendelisis (8.8%) followed by B. vagra (7.6%), G. gotyla (7.27%), T. putitora (7.17%), A. botia (6.97%), N. hexagonolepis (6.7%), B. shacra (6.34%), B. barila (4.7%) and O. barna (4.39%). Results from the Canonical Correspondence Analysis indicated that the environmental variables, such as pH, total hardness, alkalinity, dissolved oxygen and water temperature have shown to determine the fish community structure of Seti Gandaki River. Keywords: Fish diversity, freshwater, habitat, spatio-temporal, stream

Impact of light on marine bacterioplankton community structure

2005 ◽  
Vol 39 ◽  
pp. 235-245 ◽  
Author(s):  
MS Schwalbach ◽  
M Brown ◽  
JA Fuhrman
Keyword(s):  
Community Structure ◽  
Marine Bacterioplankton ◽  
Bacterioplankton Community

scholarly journals Bacterioplankton community structure: Protists control net production and the proportion of active bacteria in a coastal marine community

1996 ◽  
Vol 41 (6) ◽  
pp. 1169-1179 ◽  
Author(s):  
Paul A. del Giorgio ◽  
Josep M. Gasol ◽  
Dolors Vaqué ◽  
Paola Mura ◽  
Susana Agustí ◽  
...  
Keyword(s):  
Community Structure ◽  
Net Production ◽  
Bacterioplankton Community ◽  
Coastal Marine ◽  
Active Bacteria ◽  
Control Net ◽  
Marine Community

OPINION DYNAMICS IN POPULATIONS WITH IMPLICIT COMMUNITY STRUCTURE

2009 ◽  
Vol 20 (12) ◽  
pp. 2013-2026 ◽  
Author(s):  
XIAMENG SI ◽  
YUN LIU ◽  
ZHENJIANG ZHANG
Keyword(s):  
Community Structure ◽  
Opinion Dynamics ◽  
Initial Distribution ◽  
Contact Network ◽  
Space And Time ◽  
Opinion Evolution ◽  
Majority Model

Web encounter facilitate contacts between people from different communities outside space and time. Implicit Community Structure is exhibited because of highly connected links within community and sparse encounters between communities. Considering the imperceptible influence of encounter on opinions, Sznajd updating rules are used to mimic people's behaviors after encountering a stranger in another community. We introduce a model for opinion evolution, in which the interconnectivity between different communities is represented as encounter frequency, and leadership is introduced to control the strength of community's opinion guide. In this scenario, the effects of Implicit Community Structure of contact network on opinion evolution, for asymmetric and random initial distribution but with heterogeneous opinion guide, are investigated respectively. It is shown that large encounter frequency favors consensus of the whole populations and successful opinion spreading, which is qualitatively agree with the results observed in Majority model defined on substrates with predefined community structure.

scholarly journals Phosphate addition has minimal short-term effects on bacterioplankton community structure of the P-starved Eastern Mediterranean

2014 ◽  
Vol 72 (2) ◽  
pp. 98-104 ◽  
Author(s):  
S Fodelianakis ◽  
P Pitta ◽  
TF Thingstad ◽  
P Kasapidis ◽  
I Karakassis ◽  
...  
Keyword(s):  
Community Structure ◽  
Eastern Mediterranean ◽  
Short Term ◽  
Bacterioplankton Community ◽  
Phosphate Addition ◽  
Short Term Effects

scholarly journals Fish community structure along altitudinal gradients with relation to environmental variables in Ratuwa River of Eastern, Nepal

Our Nature ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 70-81
Author(s):  
Dipak Rajbanshi ◽  
Jash Hang Limbu ◽  
Niraj Khadka ◽  
Prakash Kumar ◽  
Jeevan Kumar Gurung ◽  
...  
Keyword(s):  
Community Structure ◽  
Altitudinal Gradient ◽  
Fish Community ◽  
Fish Diversity ◽  
Fish Assemblage Structure ◽  
Fish Community Structure ◽  
Brachydanio Rerio ◽  
Altitudinal Gradients ◽  
Space And Time ◽  
Significant Difference

Studies on fish community structure along altitudinal gradients of rivers are lacking in Nepal. This study was carried out to gauge the fish diversity and composition along elevational gradient in Ratuwa River. The altitudinal gradient varies between 70 m to 1300 m. Fish samples were collected based on habitat representativeness from April (spring) 10-18, July (summer) 10-18, October (autumn) 10-18, 2020 and January (winter) 10-18, 2021. A total of 3447 specimens representing 4 orders, 14 families and 36 species were identified. Both fish diversity and abundance of studied ichthyofauna vary with altitudinal gradient. The present study affirmed that fish species of Opsarius bendelisis, Schistura multifasciatus, Garra annandalei, Brachydanio rerio, Aspidoparia morar, and Schistura scaturigina are the major contributory species (>1%) for both space and time spectrums. Fish community structure testing for both to space and time showed significant difference in spatial spectrum (R=0.72, P<0.01) but no significant difference in temporal variation (R=-0.034, P>0.05). The present results hinted that fish assemblage structure varied significantly from low to high elevations, altitude, water temperature, water velocity, dissolved oxygen and pH was found as major influential factors (P<0.05) for species distribution.

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