Controls on microalgal community structures in cryoconite holes upon high-Arctic glaciers, Svalbard

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985939%3A_____%2F16%3A00459180" target="_blank" >RIV/67985939:_____/16:00459180 - isvavai.cz</a>

Alternative codes found

RIV/60077344:_____/16:00459180 RIV/60076658:12310/16:43891366 RIV/00216208:11310/16:10325416

Result on the web

<a href="http://dx.doi.org/10.5194/bg-13-659-2016" target="_blank" >http://dx.doi.org/10.5194/bg-13-659-2016</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5194/bg-13-659-2016" target="_blank" >10.5194/bg-13-659-2016</a>

Result language

angličtina

Original language name

Controls on microalgal community structures in cryoconite holes upon high-Arctic glaciers, Svalbard

Original language description

Glaciers are known to harbor surprisingly complex ecosystems. On their surface, distinct cylindrical holes filled with meltwater and sediments are considered hot spots for microbial life. The present paper addresses possible biological interactions within the community of prokaryotic cyanobacteria and eukaryotic microalgae (microalgae) and relations to their potential grazers, such as tardigrades and rotifers, additional to their environmental controls. Svalbard glaciers with substantial allochthonous input of material from local sources reveal high microalgal densities. Small valley glaciers with high sediment coverages and high impact of birds show high biomasses and support a high biological diversity. Invertebrate grazer densities do not show any significant negative correlation with microalgal abundances but rather a positive correlation with eukaryotic microalgae. Shared environmental preferences and a positive effect of grazing are the proposed mechanisms to explain these correlations. Most microalgae found in this study form colonies (< 10 cells, or > 25 µm), which may protect them against invertebrate grazing. This finding rather indicates grazing as a positive control on eukaryotic microalgae by nutrient recycling. Density differences between the eukaryotic microalgae and prokaryotic cyanobacteria and their high distinction in redundancy (RDA) and principal component (PCA) analyses indicate that these two groups are in strong contrast. Eukaryotic microalgae occurred mainly in unstable cryoconite holes with high sediment loads, high N:P ratios, and a high impact of nutrient input by bird guano, as a proxy for nutrients. In these environments autochthonous nitrogen fixation appears to be negligible. Selective wind transport of Oscillatoriales via soil and dust particles is proposed to explain their dominance in cryoconites further away from the glacier margins.

Czech name

—

Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

EH - Ecology - communities

OECD FORD branch

—

Project

<a href="/en/project/LM2010009" target="_blank" >LM2010009: CzechPolar ? Czech Polar Stations: Construction and management</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Biogeosciences

ISSN

1726-4170

e-ISSN

—

Volume of the periodical

13

Issue of the periodical within the volume

3

Country of publishing house

DE - GERMANY

Number of pages

16

Pages from-to

659-674

UT code for WoS article

000370973900003

EID of the result in the Scopus database

2-s2.0-84956916632