10 research outputs found
Succession of soil microbial community in a developing mid-channel bar: The role of environmental disturbance and plant community
Succession of microbial and plant communities is crucial for the development
and the stability of soil ecological functions. The relative role of plant
communities and environmental disturbance in shaping the microbial
community in a newly established habitat remains unclear. In this study, a midchannel
bar (MCB) exposed to an environmental disturbance gradient in the
Yangtze River was studied to explore the effects of such disturbance and plant
community traits on the succession of the soil microbial community. Bulk
and rhizospheric soils were collected from the MCB and classified according
to their level of exposure to environmental disturbance: head, central
and tail. These subsequently underwent high-throughput sequencing and
interdomain ecological network (IDEN) analysis to identify and characterize
the predominant microbial groups present in the soils at each disturbance
level. Furthermore, at each site, the presence and distribution of the plant
community was also noted. The present study demonstrated that both bulk
soil nutrients and plant community exhibited significant spatial distribution
dependent on the level of disturbance and this influenced the composition
of the microbial community. In less eroded parts of the MCB, i.e., the
central, nutrients accumulated, promoting growths of plants. This in turn
encouraged a more diverse microbial community, dominated by the bacterial
genus Pseudarthrobacter. Plant showed a stronger association with bulk soil
microbial communities compared to rhizosphere soil microbial communities.
Particularly, Triarrhena sacchariflora and Hemarthria altissima, present in sites
of low disturbance, exhibiting a more extensive plant-microbe association.
They thus played a key role in shaping the soil microbial community. In
general, however, plant species did not directly determine the composition
of the bacterial community, but instead altered the nutritive state of the
soil to promote microbial growth. Such findings are of significant value
for conservation practices of newly formed ecosystems, which requires an
integrated understanding of the role of environmental disturbance and plants
on soil microbial community assemblage
Ultrastructural-morphometric investigations on liver biopsies ? The influence of oral contraceptives on the human liver
A case of veno-occlusive disease of the liver in Britain associated with herbal tea consumption.
Highly pathogenic avian influenza causes mass mortality in Sandwich Tern <em>Thalasseus sandvicensis</em> breeding colonies across north-western Europe
\ua9 The Author(s), 2024. Published by Cambridge University Press on behalf of BirdLife International. In 2022, highly pathogenic avian influenza (HPAI) A(H5N1) virus clade 2.3.4.4b became enzootic and caused mass mortality in Sandwich Tern Thalasseus sandvicensis and other seabird species across north-western Europe. We present data on the characteristics of the spread of the virus between and within breeding colonies and the number of dead adult Sandwich Terns recorded at breeding sites throughout north-western Europe. Within two months of the first reported mortalities, 20,531 adult Sandwich Terns were found dead, which is >17% of the total north-western European breeding population. This is probably an under-representation of total mortality, as many carcasses are likely to have gone unnoticed and unreported. Within affected colonies, almost all chicks died. After the peak of the outbreak, in a colony established by late breeders, 25.7% of tested adults showed immunity to HPAI subtype H5. Removal of carcasses was associated with lower levels of mortality at affected colonies. More research on the sources and modes of transmission, incubation times, effective containment, and immunity is urgently needed to combat this major threat for colonial seabirds