Variation in bird’s originating nitrogen availability limits high arctic tundra development over last 2000 year (Hornsund, Svalbard)

dc.contributor.authorSkrzypek, Gen_AU
dc.contributor.authorWojtún, Ben_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorRichter, Den_AU
dc.contributor.authorJakubas, Den_AU
dc.contributor.authorWojczulanis–Jakubas, Ken_AU
dc.contributor.authorSamecka–Cymerman, Aen_AU
dc.date.accessioned2020-03-24T00:39:12Zen_AU
dc.date.available2020-03-24T00:39:12Zen_AU
dc.date.issued2016-04-20en_AU
dc.date.statistics2020-03-20en_AU
dc.description.abstractArctic and subarctic regions play important roles in the global carbon balance. However, nitrogen (N) defi-ciency is a major constraint for organic carbon sequestration in the High Arctic. Hence, the identification of therelative contributions from different N-sources is critical for understanding the constraints that limit tundra growth.The stable nitrogen composition of the three main N-sources and numerous plants were analyzed in tentundra types (including those influenced by seabirds) in the Fuglebekken catchment (Hornsund, Svalbard, 77◦N15◦E). The percentage of the total tundra N-pool provided by seabirds’ feces (from planktivorous coloniallybreeding little auks Alle alle), ranged from 0–21% in Patterned-ground tundra to 100% in Ornithocoprophiloustundra. The total N-pool utilized by tundra plants in the studied catchment originated from birds (36%),atmospheric deposition (38%), and N2-fixation (26%). The results clearly show that N-pool in the tundra issignificantly supplemented by nesting seabirds. Thus, if they experienced climate change induced substantialnegative environmental pressure, it would adversely influence the tundra N-budget (Skrzypek et al. 2015).The growth rates and the sediment thickness (<15cm) in different tundra types varied considerably but thetundra age was similar in the whole area, <450 cal BP. The only exception was Ornithocoprophilous bird-N richtundra with very diverse ages ranging from 235 to 2300 cal BP and thickness up to 110 cm. The growth rates forthis tundra (62 cm core, 18 AMS 14C dates) were high (1.5-3.0 mm/yr) between 1568 and 1804 AD and thensubstantially declined for the period between 1804 and 1929 AD (0.2 mm/yr). These findings deliver an additionalargument, that the organic matter accumulation is driven not only directly by climatic conditions but also by birds’contribution to the tundra N-pool. © 2016 Author(s)en_AU
dc.identifier.citationSkrzypek, G., Wojtuń, B., Hua, Q., Richter, D., Jakubas, D., Wojczulanis–Jakubas, K, & Samecka–Cymerman, A. (2016). Variation in bird’s originating nitrogen availability limits high arctic tundra development over last 2000 year (Hornsund, Svalbard). Paper presented at the European Geosciences Union General Assembly 17-22 April 2016, Vienna, Austria. Retrieved from https://meetingorganizer.copernicus.org/EGU2016/EGU2016-10665.pdfen_AU
dc.identifier.conferenceenddate22 April 2016en_AU
dc.identifier.conferencenameEuropean Geosciences Union General Assembly 17-22 April 2016en_AU
dc.identifier.conferenceplaceVienna, Austria.en_AU
dc.identifier.conferencestartdate17 April 2016en_AU
dc.identifier.govdoc6766en_AU
dc.identifier.urihttps://meetingorganizer.copernicus.org/EGU2016/EGU2016-10665.pdfen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9211en_AU
dc.language.isoenen_AU
dc.publisherEuropean Geosciences Unionen_AU
dc.subjectBirdsen_AU
dc.subjectNitrogenen_AU
dc.subjectArctic regionsen_AU
dc.subjectCarbonen_AU
dc.subjectTundraen_AU
dc.subjectClimatic changeen_AU
dc.titleVariation in bird’s originating nitrogen availability limits high arctic tundra development over last 2000 year (Hornsund, Svalbard)en_AU
dc.typeConference Presentationen_AU
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