Factors causing the limitation of growth of terrestrial algae in maritime Antarctica during late summer

Davey, Martin C.; Rothery, P.

doi:10.1007/bf00236982

Cited by 35 publications

(21 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the most common and sometimes only components of polar tundra are cyanobacteria and algae, and since they are communities with the quickest reaction to changes in soil trophy (Davey and Rothery 1992;Kaštovska et al 2005;Lan et al 2013), the aim of the research was to compare two cyanobacterial and algal assemblages occurring in ornithocoprophilous habitats formed under the influence of piscivorous and planktivorous seabird colonies.…”

Section: Introductionmentioning

confidence: 99%

Cyanobacterial and algal diversity in the vicinity of two different seabird colonies in Spitsbergen

Pietryka¹,

Richter²,

Matuła³

2016

Polish Polar Research

View full text Add to dashboard Cite

Abstract:The aim of the study was to compare cyanobacterial and algal assemblages occurring in ornithocoprophilous habitats formed under the influence of two seabird colonies (mixed colony of piscivorous Uria lomvia and Rissa tridactyla and planktivorous Alle alle) nesting on the southwest side of Hornsund (Spitsbergen). Various influences of the bird colonies (e.g. surface trophy, treading) lead to the formation of ornithogenic habitats with quantitatively and qualitatively diverse cyanobacterial and algal assemblages. Only 6 species common to both habitats were identified, but due to their different proportions the similarity ended there. Cyanobacterial and algal assemblages of both ornithogenic habitats also react rather differently to the intensity of the bird colonies' influence. The assemblages located directly beneath piscivorous bird nests were characterized by a larger number of species, which decreased the farther from the colony it was. Cyanobacterial and algal assemblages located directly next to planktivorous bird nests were species poor, but species richness increased at locations farther from their direct influence. The obtained results confirmed that bird colonies characterized by different diet and behavior influenced the formation of two separate, quantitatively and qualitatively different cyanobacterial and algal assemblages. Species such as Eucapsis sp., Gleocapsopsis sp., Gloeothece sp., Woronichinia sp., Hematococcus sp. were characteristic for algae and cyanobacteria assemblages in the vicinity of piscivorous bird colonies, whereas Aphanocapsa sp., Gloeothece sp., Komvophoron minutum, Pseudanabaena sp., Gloeocystis sp. 2 occurred in the vicinity of planktivorous bird colonies.

show abstract

Section: Introductionmentioning

confidence: 99%

Cyanobacterial and algal diversity in the vicinity of two different seabird colonies in Spitsbergen

Pietryka¹,

Richter²,

Matuła³

2016

Polish Polar Research

View full text Add to dashboard Cite

show abstract

“…Besides being considerable primary producers, they are able to fix atmospheric nitrogen, thus be− ing an important source of nitrogen for other organisms. Nitrogen often limits pri− mary production in the Arctic (Henry and Svoboda 1986;Davey and Rothery 1992;Liengen and Olsen 1997;Walker et al 2008;etc. ).…”

Section: Introductionmentioning

confidence: 99%

Impact of warming on Nostoc colonies (Cyanobacteria) in a wet hummock meadow, Spitsbergen

Elster¹,

Kvíderová²,

Hájek³

et al. 2012

Polish Polar Research

View full text Add to dashboard Cite

Abstract:In order to simulate the warming effects on Arctic wetlands, three passive open−top chambers (OTCs) and three control cage−like structures (CCSs) equipped with soil temperature and soil volumetric water content (VWC) probes for continuous micro− climatic measurements were installed in a wet hummock meadow, Petuniabukta, Bille− fjorden, central Spitsbergen, in 2009. The warming effects on primary productivity were investigated during summer seasons 2009 and 2010 in cyanobacterial colonies of Nostoc commune s.l., which plays an important role in the local carbon and nitrogen cycles. The microclimatic data indicated that the effect of OTCs was dependent on microtopography. During winter, two short−term snow−thaw episodes occurred, so that liquid water was available for the Nostoc communities. Because of the warming, the OTC hummock bases remained unfrozen three weeks longer in comparison to the CCSs and, in spring, the OTC hummock tops and bases exceeded 0°C several days earlier than CCS ones. Mean summer temperature differences were 1.6°C in OTC and CCS hummock tops, and 0.3°C in the OTC and CCS hummock bases. The hummock tops were drier than their bases; however the VWC difference between the OTCs and CCSs was small. Due to the only minor differ− ences in the microclimate of OTC and CCS hummock bases, where the Nostoc colonies were located, no differences in ecophysiological characteristics of Nostoc colonies ex− pressed as photochemistry parameters and nitrogenase activities were detected after two years exposition. Long−term monitoring of Nostoc ecophysiology in a manipulated envi− ronment is necessary for understanding their development under climate warming.

show abstract

“…The cyanobacteria play a dual role here. Besides being considerable primary producers, they are able to fix atmospheric nitrogen; thus representing an important source of nitrogen for the other organisms, since nitrogen often limits the primary production in the Arctic (DAvey & Rothery 1992;Liengen & Olsen 1997, and references therein). Desiccation stresses represent the most severe infliction in the polar regions (dAvey 1989), so the cyanobacterial primary production and nitrogen fixation have to follow the moisture and temperature conditions, and water deficiency could slow or inhibit there processes (Liengen & Olsen 1997;Vincent 2000;Novis et al 2007).…”

Section: Introductionmentioning

confidence: 99%

In situ response of Nostoc commune s.l. colonies to desiccation in Central Svalbard, Norwegian High Arctic.

Kvíderová¹,

Elster²,

imek³

2011

Fottea

View full text Add to dashboard Cite

Abstract:The effects of desiccation on photochemical processes and nitrogenase activity were evaluated in Nostoc commune s.l. colonies in situ from a wet thufur meadow at Petuniabukta, Billefjorden, Central Svalbard, during the 2009 arctic summer. The colonies were collected in the fully hydrated state, and were subjected to slow desiccation at ambient temperatures (5 -8°C) and low light (30 -80 µmol.m ). For each colony the weight, area, photochemical performance, and nitrogenase activity were determined at the beginning, as well as on every day during the first four days of the experiment; thereafter, on every second day until desiccation was complete. The photochemical performance was evaluated from variable chlorophyll fluorescence parameters (F V /F M , Φ PSII , qP, and NPQ), and the nitrogenase activity was estimated by an acetylene-ethylene reduction assay. A significant decrease in the photochemically active area was recorded from the third day, when the colony had lost approximately 40% of its original weight indicating some changes in the extracellular matrix, and stopped on the 14 th to 18 th day. No effects of the desiccation on the main photochemical parameters (F V /F M , Φ PSII , qP) were observed up to the sixth to eighth days of desiccation. Slightly lower values of F V /F M and Φ PSII recorded in fullyhydrated colonies could be caused by impaired diffusion of CO 2 into cells. The steep reduction of photochemical activity occurred between the eighth and tenth day of the experiment, when the colony had lost approximately 80% of its fully-hydrated weight. The nitrogenase activity was highest on the first day, probably due to improved diffusion of N 2 into cells, then declined, but was detectable until the sixth day of the experiment. Since Nostoc commune s.l. colonies were capable of photosynthesis and nitrogen fixation to the level of ca. 60% of its fullyhydrated weight, even partly-hydrated colonies contribute substantially to carbon and nitrogen cycling in the High Arctic wet meadow tundra ecosystem.

show abstract

Factors causing the limitation of growth of terrestrial algae in maritime Antarctica during late summer

Cited by 35 publications

References 12 publications

Cyanobacterial and algal diversity in the vicinity of two different seabird colonies in Spitsbergen

Cyanobacterial and algal diversity in the vicinity of two different seabird colonies in Spitsbergen

Impact of warming on Nostoc colonies (Cyanobacteria) in a wet hummock meadow, Spitsbergen

In situ response of Nostoc commune s.l. colonies to desiccation in Central Svalbard, Norwegian High Arctic.

Contact Info

Product

Resources

About