Dynamique pluriannuelle des hyphomycètes aquatiques de l'Osse, rivière réalimentée du sud-ouest de la France

The Osse River is a plain river (southwest of France) fed by the Neste Canal flowing from the Pyrénées. From 1988 to 1993, 46 samples taken from the foam in the river have shown a great temporal variability in densities of aquatic hyphomycete conidia, especially during winter. In 1992, the winter maximum density, related to the latest leaf breakdown, was 1522 conidia/mm3, and the winter minimum, in 1989, 2 conidia/mm3. This variability was much lower during spring. The water temperature varied between 3.0 and 23.5 °C. Several species of hyphomycetes appeared as extremely sensitive to temperature variations, whereas no significant correlation with pH variations was found. The effects of floods on the fungal community varied according to the flood intensity and timing and to the composition of the riparian vegetation. The role of the species composition and the phenology of the riparian vegetation on the fungal community stucture and dynamics was discussed in relation to leaf litter decomposition. This paper emphasizes the need to take into account the flood intensity for the study of hyphomycetes dynamics and the significant role of hydrodynamics in freshwater nutrient cycle. Key words: aquatic hyphomycetes, temperature, pH, vegetation phenology, vegetation composition, decomposition, hydrodynamic.

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Mapping Forest Fuels through Vegetation Phenology: The Role of Coarse-Resolution Satellite Time-Series

PLoS ONE ◽

10.1371/journal.pone.0119811 ◽

2015 ◽

Vol 10 (3) ◽

pp. e0119811 ◽

Cited By ~ 38

Author(s):

Sofia Bajocco ◽

Eleni Dragoz ◽

Ioannis Gitas ◽

Daniela Smiraglia ◽

Luca Salvati ◽

...

Keyword(s):

Time Series ◽

Vegetation Phenology ◽

Forest Fuels ◽

Coarse Resolution

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The role of riparian vegetation density, channel orientation and water velocity in determining river temperature dynamics

Journal of Hydrology ◽

10.1016/j.jhydrol.2017.03.024 ◽

2017 ◽

Vol 553 ◽

pp. 471-485 ◽

Cited By ~ 40

Author(s):

Grace Garner ◽

Iain A. Malcolm ◽

Jonathan P. Sadler ◽

David M. Hannah

Keyword(s):

Riparian Vegetation ◽

Water Velocity ◽

Vegetation Density ◽

River Temperature ◽

Temperature Dynamics ◽

Channel Orientation

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Role of vermicompost chemical composition, microbial functional diversity, and fungal community structure in their microbial respiratory response to three pesticides

Bioresource Technology ◽

10.1016/j.biortech.2011.07.113 ◽

2011 ◽

Vol 102 (20) ◽

pp. 9638-9645 ◽

Cited By ~ 23

Author(s):

Manuel J. Fernández-Gómez ◽

Rogelio Nogales ◽

Heribert Insam ◽

Esperanza Romero ◽

Marta Goberna

Keyword(s):

Community Structure ◽

Chemical Composition ◽

Functional Diversity ◽

Fungal Community ◽

Respiratory Response ◽

Microbial Functional Diversity ◽

Fungal Community Structure

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Deterministic Selection Dominates Microbial Community Assembly in Termite Mounds Across a Large Spatial Area

10.21203/rs.3.rs-34782/v1 ◽

2020 ◽

Author(s):

Qing-Lin Chen ◽

Hang-Wei Hu ◽

Zhen-Zhen Yan ◽

Chao-Yu Li ◽

Bao-Anh Thi Nguyen ◽

...

Keyword(s):

Microbial Community ◽

Stochastic Processes ◽

Microbial Communities ◽

Fungal Community ◽

Community Assembly ◽

Distance Decay ◽

Termite Mounds ◽

Deterministic Processes ◽

Microbial Community Assembly

Abstract Background: Termites are ubiquitous insects in tropical and subtropical habitats, where they construct massive mounds from soil, their saliva and excreta. Termite mounds harbor an enormous amount of microbial inhabitants, which regulate multiple ecosystem functions such as mitigating methane emissions and increasing ecosystem resistance to climate change. However, we lack a mechanistic understanding about the role of termite mounds in modulating the microbial community assembly processes, which are essential to unravel the biological interactions of soil fauna and microorganisms, the major components of soil food webs. We conducted a large-scale survey across a >1500 km transect in northern Australia to investigate biogeographical patterns of bacterial and fungal community in 134 termite mounds and the relative importance of deterministic versus stochastic processes in microbial community assembly. Results: Microbial alpha (number of phylotypes) and beta (changes in bacterial and fungal community composition) significantly differed between termite mounds and surrounding soils. Microbial communities in termite mounds exhibited a significant distance-decay pattern, and fungal communities had a stronger distance-decay relationship (slope = -1.91) than bacteria (slope = -0.21). Based on the neutral community model (fitness < 0.7) and normalized stochasticity ratio index (NST) with a value below the 50% boundary point, deterministic selection, rather than stochastic forces, predominated the microbial community assembly in termite mounds. Deterministic processes exhibited significantly weaker impacts on bacteria (NST = 45.23%) than on fungi (NST = 33.72%), probably due to the wider habitat niche breadth and higher potential migration rate of bacteria. The abundance of antibiotic resistance genes (ARGs) was negatively correlated with bacterial/fungal biomass ratios, indicating that ARG content might be an important biotic factor that drove the biogeographic pattern of microbial communities in termite mounds. Conclusions: Deterministic processes play a more important role than stochastic processes in shaping the microbial community assembly in termite mounds, an unique habitat ubiquitously distributed in tropical and subtropical ecosystems. An improved understanding of the biogeographic patterns of microorganisms in termite mounds is crucial to decipher the role of soil faunal activities in shaping microbial community assembly, with implications for their mediated ecosystems functions and services.

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PENGARUH KERAPATAN LAMUN Thalassia hemprichii TERHADAP KELIMPAHAN BAKTERI HETEROTROF DI PANTAI PRAWEAN, JEPARA

Management of Aquatic Resources Journal (MAQUARES) ◽

10.14710/marj.v7i4.22664 ◽

2018 ◽

Vol 7 (4) ◽

pp. 415-422

Author(s):

Isnaini Dian Yunita ◽

Niniek Widyorini ◽

Supriharyono Supriharyono

Keyword(s):

Heterotrophic Bacteria ◽

Nutrient Cycle ◽

Thalassia Hemprichii ◽

Enhalus Acoroides ◽

Seagrass Ecosystem ◽

Halodule Uninervis ◽

Cymodocea Rotundata ◽

Economic Function ◽

Seagrass Density

Ekosistem lamun merupakan salah satu ekosistem yang memiliki kompleksitas dan keanekaragaman hayati yang tinggi. Padang lamun merupakan hamparan vegetasi lamun yang menutupi suatu kawasan pesisir. Selain memiliki fungsi ekonomi, lamun juga memiliki fungsi ekologis yakni berperan penting sebagai pendaur zat hara oleh mikroorganime yaitu bakteri. Penelitian ini bertujuan untuk mengetahui kerapatan lamun, kelimpahan bakteri heterotrof yang berasosiasi dengan lamun serta pengaruh kerapatan lamun dengan kelimpahan bakteri heterotrof di Pantai Prawean, Jepara. Metode yang digunakan yakni deskriptif eksplanatif dengan pengambilan sampel secara purposive dan dianalisis dengan IBM SPSS Statistic 22. Jenis lamun yang ditemukan di Pantai Prawean ada 5 (lima): Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, Halodule uninervis dan Halodule pinifolia. Kerapatan tertinggi didapat dari jenis Thalassia hemprichii sebesar 78 Ind/m2 dan terendah adalah Enhalus acoroides 10 Ind/m2 dan kelimpahan bakteri heterotrof tertinggi diperoleh dari tingkat kerapatan rapat di stasiun 3 yakni 29,4x108 Upk/ml dan kelimpahan terendah diperoleh dari tingkat kerapatan jarang di stasiun 2 yakni 3,3x108 Upk/ml. Korelasi antara kerapatan lamun dengan kelimpahan bakteri heterotrof tinggi atau kuat yakni 0,896 dan korelasi ini dinyatakan sangat signifikan terbukti nilai sig. 0,001 dengan tingkat kesalahan 0,1%. Artinya bertambahnya kerapatan lamun dapat meningkatkan pula kelimpahan bakteri heterotrof. Seagrass ecosystem is one ecosytems that has high complexity and biodiversity. Seagrass beds are a stretch of seagrass vegetation that covers a coastal area. Beside its economic function, seagrass also have ecological function that play an important role of nutrient cycle for microorganism its bacteria. This study aims to determine the density of seagrass, the abundance of heterothropic bacteria and influence of seagrass density with abundance of heterotrophic bacteria at Prawean beach, Jepara. The method used in this study is descriptive explanative with purposive sampling and the data analyzed by IBM SPSS Statistic 22. There are 5 (five) species of seagrass that can be found in Prawean beach: Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, Halodule uninervis and Halodule pinifolia. The highest density obtained from Thalassia hemprichii species is 78 sprouts of seagrass/m2 and the lowest density obtained from Enhalus acoroides is 10 obtained from seagrass density at station 3 its value 29,4x108Cfu/ml and the lowest abundance of heterotrophic bacteria was obtained from rare seagrass at station 2 its value 3,3x108Cfu/ml. The corelation between seagrass density with abundance heterotrophic bacteria is high or strong that has value 0,846 and this correlation is very significantly proven has sig value 0,001 with error rate 0,1%, it can be conclude that increase of seagrass density can also increase the abundance of heterotrophic bacteria.

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Loss of riparian vegetation alters the ecosystem role of a freshwater crayfish (Cherax destructor) in an Australian intermittent lowland stream

Journal of the North American Benthological Society ◽

10.1899/09-015.1 ◽

2009 ◽

Vol 28 (3) ◽

pp. 626-637 ◽

Cited By ~ 13

Author(s):

Darren Giling ◽

Paul Reich ◽

Ross M. Thompson

Keyword(s):

Riparian Vegetation ◽

Freshwater Crayfish ◽

Lowland Stream ◽

Cherax Destructor

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The rôle of non-covalent forces in micelle formation by vicilin from Vicia faba. The effect of pH variations on protein interactions

Food Chemistry ◽

10.1016/0308-8146(86)90099-3 ◽

1986 ◽

Vol 20 (4) ◽

pp. 305-318 ◽

Cited By ~ 7

Author(s):

M.A.H. Ismond ◽

E.D. Murray ◽

S.D. Arntfield

Keyword(s):

Vicia Faba ◽

Protein Interactions ◽

Micelle Formation ◽

Effect Of Ph ◽

Ph Variations

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Incorporating fungal community ecology into invasion biology: challenges and opportunities

Microbiology Australia ◽

10.1071/ma18015 ◽

2018 ◽

Vol 39 (1) ◽

pp. 56

Author(s):

Eleonora Egidi ◽

Ashley E Franks

Keyword(s):

Community Ecology ◽

Plant Species ◽

Fungal Community ◽

Invasive Plant ◽

Invasion Biology ◽

Invasive Plant Species ◽

Native Communities ◽

Challenges And Opportunities ◽

And Control

Recently, the role of the plant-associated mycobiome (i.e. the fungal community) in influencing the competitive success of invasive plant species has received increasing attention. Fungi act as primary drivers of the plant invasion process due to their ability to form both beneficial and detrimental relationships with terrestrial plant species. Here we review the role of the plant mycobiome in promoting or inhibiting plant species invasion into foreign ecosystems. Moreover, the potential to exploit these relationships for invasive plant control and restoration of native communities is discussed. Incorporating fungal community ecology into invasion and restoration biology will aid in the management and control of invasive plant species in Australia.

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