Fossil cladoceran record from Lake Piramide Inferiore (5067 m asl) in the Nepalese Himalayas : biogeographical and paleoecological implications

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Nevalainen , L , Lami , A , Luoto , T P & Manca , M 2014 , ' Fossil cladoceran record from Lake Piramide Inferiore (5067 m asl) in the Nepalese Himalayas : biogeographical and paleoecological implications ' , Journal of Limnology , vol. 73 , no. 2 , pp. 358-368 . https://doi.org/10.4081/jlimnol.2014.864

Title: Fossil cladoceran record from Lake Piramide Inferiore (5067 m asl) in the Nepalese Himalayas : biogeographical and paleoecological implications
Author: Nevalainen, Liisa; Lami, Andrea; Luoto, Tomi P.; Manca, Marina
Contributor: University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Department of Geosciences and Geography
Date: 2014
Language: eng
Number of pages: 11
Belongs to series: Journal of Limnology
ISSN: 1129-5767
URI: http://hdl.handle.net/10138/162083
Abstract: We investigated 2500 years of community succession in Cladocera from the sediments of a mountain lake (Lake Piramide Inferiore) located in the Khumbu Valley close to Mt. Everest in the Nepalese Himalayas. Our objective was to determine late Holocene changes in cladoceran species composition and abundance in a biogeographical context and with respect to previous proxy-based paleolimnological data (algal pigments and organic content). The results suggested that cladoceran fauna of Lake Piramide Inferiore was species-poor and dominated by Chydorus cf. sphaericus throughout the sequence. The sediment profile recorded the occurrence of Alona guttata type individuals, which were attributed to Alona werestschagini Sinev 1999 based on their morphology and the species' current distributional range, and this was the first record of its presence in the Himalayas. In addition, a periodic long-term succession of melanic Daphnia (Ctenodaphnia) fusca Gurney, 1907 and non-melanic D. (Daphnia) dentifera Forbes 1893 was observed in the sediments. The millennia-long cladoceran community changes, although subtle due to the C. cf. sphaericus dominance, were in general agreement with the previous proxy-data of lake productivity following the regional paleoclimatic development and apparently partly driven by bottom-up mechanisms. The periodic occurrence and success of D. fusca and D. dentifera throughout the late Holocene in Lake Piramide Inferiore, combined with the knowledge of their phenotypic properties (i.e. carapace melanization) and previous investigations on their contemporary and past distribution in Khumbu Valley, suggested that they may have responded to altered underwater UV radiation regimes. Furthermore, they may have even periodically excluded each other subsequent to changes in the underwater UV environment. The results indicated the usefulness of fossil cladoceran analysis as a tool in biogeographical research, since the occurrence of species in space and time can be observed through sediment records and taxonomic identity of the remains may be resolved with the help of regional faunal distribution.
Subject: Alona werestschagini
Ctenodaphnia
Khumbu Valley
Late Holocene
Mountain lakes
UV response
HIGH-MOUNTAIN LAKES
HIGH-LATITUDE LAKES
SUBFOSSIL REMAINS
DAPHNIA-HIMALAYA
CLIMATIC CHANGES
KHUMBU REGION
ALPINE LAKES
FOOD-WEB
ZOOPLANKTON
COMMUNITIES
1172 Environmental sciences
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