Long‐term community dynamics in vascular epiphytes on
            Annona glabra
            along the shoreline of Barro Colorado Island, Panama

Abstract Objectives Extensive efforts have been made to characterize the rumen microbiome under various conditions. However, few studies have addressed the long-term impacts of ruminal microbiome dysbiosis and the extent of host control over microbiome stability. These data can also inform host-microbial symbioses. The objective was to develop preliminary data to measure the changes that occur in the rumen bacterial communities following a rumen content exchange to understand the effects major perturbations may impart upon the rumen microbiome, which may be host-driven. Data description We report here an initial rumen content exchange between two SimAngus (Simmental/Angus) non-pregnant, non-lactating cows of ~ 6 years of age weighing 603.4 ± 37.5 kg. To measure bacterial community succession and acclimation following the exchange, rumen content was collected via rumen cannula at the beginning of the study immediately prior to and following the rumen content exchange, and weekly for 12 weeks. The V4 hypervariable region of the 16S rRNA gene was targeted for DNA sequencing and bacterial analysis. Over 12 weeks, numerous genera and diversity varied, before partial return to pre-exchange metrics. These preliminary data help support potential host control for the rumen microbiome, aiding in efforts to define bovine host-microbe relationships.

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Lake sedimentary DNA to reveal long-term changes in aquatic biodiversity and ecosystem functioning

ARPHA Conference Abstracts ◽

10.3897/aca.4.e65378 ◽

2021 ◽

Vol 4 ◽

Author(s):

Isabelle Domaizon

Keyword(s):

Community Dynamics ◽

Temporal Dynamics ◽

Critical Research ◽

Aquatic Biodiversity ◽

Biological Variables ◽

Long Term Changes ◽

Research Questions ◽

Population And Community Dynamics ◽

Emerging Topics

The emergence of molecular analyses based on the sequencing of sedimentary DNA has opened up many new areas of inquiry in paleolimnology. DNA preserved in sediments (SedDNA) offers the possibility to consider taxa that were traditionally not accessible because they do not leave distinct morphological fossils. Recent applications that considered a diversity of biological groups (including bacteria, protists, zooplankton, fish) illustrate how efficiently SedDNA-based methods complement both classical paleolimnology proxies and limnological data. The knowledge gained from this approach is very diverse in scope, ranging from quantifying natural variability in population and community dynamics to understanding how these biological variables respond to anthropogenic disturbances and climatic change. The use of lake sedimentary DNA to track long-term changes in aquatic biota is a rapidly advancing field of research. Based on recent applications, this presentation illustrates (i) the potential and challenges associated with the study of SedDNA to address critical research questions in lacustrine ecology (ii) the main methodological precautions to be taken into account for implementing these types of DNA analyses (i.e. best practices) and (iii) the emerging topics that could be addressed using sedimentary DNA, in particular to reconstruct the temporal dynamics of lacustrine biodiversity.

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The effects of glyphosate and triclopyr on common bryophytes and lichens in northwestern Ontario

Canadian Journal of Forest Research ◽

10.1139/x99-083 ◽

1999 ◽

Vol 29 (7) ◽

pp. 1101-1111 ◽

Cited By ~ 24

Author(s):

Steven G Newmaster ◽

F Wayne Bell ◽

Dale H Vitt

Keyword(s):

Species Richness ◽

Community Dynamics ◽

Herbicide Application ◽

Northwestern Ontario ◽

Application Rates ◽

Open Forest ◽

Randomized Design ◽

Completely Randomized Design ◽

The Relationship

The effects of two silvicultural herbicides (Vision®, Release®) on bryophytes and lichens were studied in a harvested boreal mixedwood ecosystem. A completely randomized design with 115 plots of 1 m2 allowed direct comparison between herbicides and their effects on community dynamics. Regression models were used to analyze the relationship between herbicide application rates (0.71-6.72 kg active ingredient/ha) and changes in bryophyte and lichen abundance and species richness for 2 years following herbicide application. Results showed that bryophyte and lichen abundance and species richness decreased after herbicide treatments. In general, herbicide applications reduced the diversity of forest mesophytes and weedy colonizers to an ecosystem with only a few species of colonizers. A combination of clustering techniques and ANOVA were used to divide bryophytes and lichens into three ecologically defined response groups: herbicide-tolerant colonizers, semi tolerant long-term stayers from dry open forest, and sensitive forest mesophytes.

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Long‐term microbial community dynamics at two full‐scale biotrickling filters treating pig house exhaust air

Microbial Biotechnology ◽

10.1111/1751-7915.13417 ◽

2019 ◽

Vol 12 (4) ◽

pp. 775-786 ◽

Cited By ~ 1

Author(s):

Caroline Van der Heyden ◽

Thijs De Mulder ◽

Eveline I. P. Volcke ◽

Peter Demeyer ◽

Marc Heyndrickx ◽

...

Keyword(s):

Microbial Community ◽

Community Dynamics ◽

Full Scale ◽

Biotrickling Filters ◽

Microbial Community Dynamics

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Understanding the Long-Term Weed Community Dynamics in Organic and Conventional Crop Rotations Using the Principal Response Curve Method

Weed Science ◽

10.1017/wsc.2018.64 ◽

2019 ◽

Vol 67 (2) ◽

pp. 195-204 ◽

Cited By ~ 1

Author(s):

Dilshan Benaragama ◽

Julia L. Leeson ◽

Steve J. Shirtliffe

Keyword(s):

Community Composition ◽

Community Dynamics ◽

Cropping Systems ◽

High Input ◽

Organic Systems ◽

No Till ◽

Principal Response Curve ◽

Predominant Factor ◽

Conventional Systems

AbstractWeeds have acquired evolutionary adaptations to the diverse crop and weed management strategies used in cropping systems. Therefore, changes in crop production practices such as conventional to organic systems, tillage-based to no-till systems, and diversity in crop rotations can result in differences in weed community composition that have management implications. A study was carried out to understand the weed community dynamics in a long-term alternative cropping systems study at Scott, SK, Canada. Long-term (18-yr) weed community composition data in wheat (Triticum aestivumL.) in ORG (organic), RED (reduced-input, no-till), and HIGH (high-input, conventional tillage) systems with three levels of crop rotation diversity, LOW (low diversity), DAG (diversified annual grains), and DAP (diversified annuals and perennials), were used to study the effect of different cropping systems and the effect of environment (random temporal effects) on residual weed community composition using the principal response curve (PRC) technique. The interaction between cropping systems and year-to-year random environmental changes was found to be the predominant factor causing fluctuations in weed community composition. Furthermore, the single most predominant factor influencing the weed composition was year-to-year random changes. Organic systems clearly differed from the two conventional systems in most years and had more diverse weed communities compared with the two conventional systems. The two conventional systems exhibited similar weed composition in most years. In this study, the use of the PRC method allowed capture of the real temporal dynamics reflected in the cropping systems by time interaction. This study further concludes that moving from a tillage-based, high-input conventional system to a no-till, reduced-input system did not cause significant changes in the weed community composition throughout the time period, but diversity in organic systems was high, probably due to increased occurrence of some difficult to control species.

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