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Spatiotemporal distribution of species diversity and community structure of ciliates in intertidal sandy sediments of Huokun’ao beach Nanji Islands (East China Sea China)

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12
· “PROTIST–2016”
plankton biomass has also increased 1.9 and 1.3
times, respectively. Along with these changes, a
redistribution of the total biomass of the plankton
community has occured between the pelagic and
littoral parts. In the pelagic zone of the lake the
increase was most significant, 3.8 times, and in
the littoral zone it amounted 1.3 times. The share
of protists in the unicellular plankton biomass in
the pelagic zone remained unchanged, while in
the littoral zone it increased 2.3 times. Protist’s
contribution into the total plankton biomass in the
pelagic zone increased 1.3 times, and in the littoral
3.4 times. These changes were mainly related to the
increased role of the cryptophytes, dinoflagellates
and ciliates, especially mixotrophic. In the context
of eutrophication the most significant correlations of
individual groups of protists were registered with the
concentrations of phosphorus, ammonia nitrogen
and chlorophyll a. The influence of environmental
factors on the peculiarities of protist distribution and
ratios of their groups are discussed.
IOTANEMA SPIRALE GEN. ET SP. NOV., A
NEW ENDOBIOTIC LINEAGE OF FORNICATA WITH STRIKINGLY SIMPLIFIED
MORPHOLOGY AND ULTRASTRUCTURE
Čepička I.1, Yubuki N.1, Zadrobilkova E.1,2
1
- Department of Zoology, Charles University in
Prague, Vinicna 7, 128 44 Prague 2, Czech Republic
2
- Centre for Epidemiology and Microbiology,
National Institute of Public Health, Srobarova 48,
100 42 Prague, Czech Republic
ivan.cepicka@centrum.cz
Fornicata is a lineage of excavates living in low
oxygen environments and lacking a conventional
mitochondrion. Three main morphological/ecological subgroups of Fornicata are recognized:
free-living Carpediemonas-like organisms (CLOs)
from marine habitats and two parasitic/commensal
lineages living in animal hosts, retortamonads and
diplomonads. The research of Fornicata centers
on evolutionary perspectives such as transition
from free-living lifestyle to parasitic one and
mitochondrion transformation. Nonetheless,
current modest knowledge of the biodiversity of
Fornicata limits our ability to draw the whole
picture of evolutionary history of this group. The
free-living CLOs are particularly important due to
the plesiomorphic traits of excavates. In this study,
we cultured a novel member of Fornicata, Iotanema
spirale gen. et sp. nov., isolated from fresh feces of
a gecko. I. spirale exhibits several unique features
not seen among fornicates. It possesses a single
flagellum and a highly reduced cytoskeletal system
with a single microtubular root, two fibers, and
dorsal fan; the excavate ventral groove is missing.
SSU rRNA gene analyses demonstrated that I.
spirale branches as a sister lineage to the free-living
CLO Hicanonectes teleskopos and its relatives, which
means that it represents the third known endobiotic
lineage of Fornicata.
SPATIOTEMPORAL DISTRIBUTION OF SPECIES DIVERSITY AND COMMUNITY STRUCTURE OF CILIATES IN INTERTIDAL SANDY
SEDIMENTS OF HUOKUN’AO BEACH, NANJI
ISLANDS (EAST CHINA SEA, CHINA)
Chen X.1, Chen W.2, Cai H.2, Xu K.1
1
- Institute of Oceanology, Chinese Academy of
Sciences, Qingdao 266071, China
2
- Nanji Islands National Marine Nature Reserve
Administration, Pingyang 325401, China
xchen@qdio.ac.cn
In intertidal sediments, ciliates are a highly diverse and
quantitatively dominant group, whose community
structure, in some sense, may reflect the condition
of environmental quality. We investigated the
spatiotemporal distribution of species diversity and
community structure of ciliates in the intertidal
sandy sediments of Huokun’ao beach, Nanji Islands
National Marine Natural Reserve based on sample
collections in November 2013 (autumn), February
(winter), May (spring) and August (summer) 2014.
The results showed highly diverse and abundant
ciliates in the intertidal sediments of the beach,
where a total of 148 species representing 19 orders
and over 70 genera were identified. The abundance
and species composition of benthic ciliates showed
significant correlation with seasons and sediment
depths. Bacterivorous ciliates constituted the
most abundant group, followed by carnivores
and algivores. The predominance of bacterivores
indicated that the ciliate community in the intertidal
sediment of Huokun’ao was not a typical interstitial
ciliates fauna, but a pattern similar to those in muddy
sand sediments with high level of organic matter.
This is likely a subsequent effect of long-term human
activities. In spite of the impact, the high diversity
of ciliates indicates that the benthic environment in
the Huokun’ao beach and its surrounding area is in
fair condition, which is attributed to the biodiversity
conservation measures adopted, e.g. the relocation
of surrounding residents and facilities.
PROKARYOTIC ENDOCYTOBIONTS OF
PELOMYXIDAE
Chistyakova L.V. 1, Berdieva M.A. 2, Kostygov
A.Yu.3,4, Frolov A.O.3
1
- Centre of Core Facility of SPSU “Culturing
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sea, species, distributions, east, islands, community, structure, china, diversity, ciliates, beach, sand, intertidal, nanji, sediments, huokunвђ, spatiotemporal
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