zooplankton and phytoplankton interactions. Northeast Greenland 2013

Enregistrements de données

Les données de cette ressource données d'échantillonnage ont été publiées sous forme d'une Archive Darwin Core (Darwin Core Archive ou DwC-A), le format standard pour partager des données de biodiversité en tant qu'ensemble d'un ou plusieurs tableurs de données. Le tableur de données du cœur de standard (core) contient 756 enregistrements.

2 tableurs de données d'extension existent également. Un enregistrement d'extension fournit des informations supplémentaires sur un enregistrement du cœur de standard (core). Le nombre d'enregistrements dans chaque tableur de données d'extension est illustré ci-dessous.

Cet IPT archive les données et sert donc de dépôt de données. Les données et métadonnées de la ressource sont disponibles pour téléchargement dans la section téléchargements. Le tableau des versions liste les autres versions de chaque ressource rendues disponibles de façon publique et permet de tracer les modifications apportées à la ressource au fil du temps.

Versions

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Comment citer

Les chercheurs doivent citer cette ressource comme suit:

Finstad A G, Nilsen E, Henricksen D, Schmidt N M (2019): zooplankton and phytoplankton interactions. Northeast Greenland 2013. v1.4. NTNU University Museum. Dataset/Samplingevent. https://gbif.vm.ntnu.no/ipt/resource?r=zoopl_phytopl_interactions_northeast_greenland_2013&v=1.4

Droits

Les chercheurs doivent respecter la déclaration de droits suivante:

L’éditeur et détenteur des droits de cette ressource est Norwegian University of Science and Technology. Ce travail est sous licence Creative Commons Attribution (CC-BY) 4.0.

Enregistrement GBIF

Cette ressource a été enregistrée sur le portail GBIF, et possède l'UUID GBIF suivante : a855a639-cccb-4286-af92-f7567d74a887.  Norwegian University of Science and Technology publie cette ressource, et est enregistré dans le GBIF comme éditeur de données avec l'approbation du GBIF Norway.

Mots-clé

Samplingevent

Contacts

Couverture géographique

Two main study areas: Zackenberg valley (close to the Zackenberg research station) and Lille Sødal (close to the Daneborg research station).

Couverture temporelle

Méthodes d'échantillonnage

Zooplankton was sampled by filtering 20 l of water through a 90 µm plankton net. The water samples were from the deepest point of the lake, or as far out as accessible with waders (ca. <1.5 m depth). Three replicated samples per lake where collected at each sampling day. Water samples for chlorophyll a and chemical analysis were taken as surface samples over the deepest point in the lake, or as far out as accessible with waders (ca. <1.5 m). Water samples for chemical parameters where frozen at -18 °C at the day of sampling and later analyzed for total organic carbon (TOC), total nitrogen (totN) and total phosphorous (totP) according to standard procedures in an accredited (NS EN ISO 17025) water laboratory (Analysesenteret, https://www.trondheim.kommune.no/analysesenteret/). Vegetation coverage of lake catchment areas where determined by walking transects in four directions (north, east, south and west) to the end of the catchment or 200 meters (whatever came first). A minimum of four plots per transect (2 square meters) where set at regular intervals and percentage coverage of 11 classes (rock or gravel, bare soil, mosses, graminoids, Dryas, lichens, Salix, Cassiope, Saxifraga, bogs or wetland, and other) where determined by visual inspection. Mean coverage of vegetation classes throughout all sampling plots belonging to a particular lake where then used as proxy for catchment vegetation cover of that lake.

Description des étapes de la méthode:

1. Zooplankton was stored in 70% ethanol. All organisms in a sample were counted, with exception of some samples where naupli larvae where counted using subsamples. In this case, a known fraction were examined until at least 200 organisms were counted. Cyclops spp. where identified to genus level, whereas the other main zooplankton taxa (Macrothrix hirsuticornis, Daphnia pulex, Chydorus sphaericus) where determined to species level. Biomass of zooplankton where determined by measuring a subsample of individuals from one of the replicates at each lake at each sampling occasion (25 or as many as in sample if less) under a dissection microscope. Dry mass (µg) where determined using length-weight regression following Botrell et al. (Nor J Zool. 24, 419–456, 1976), and in case of naupli larva Dumont et al. (Oecologia 19, 75–97, 1975). Information on presence or absence of fish (Arctic char, Salvelinus alpinus L.) was based on previous gillnet test fishing in the lakes.
2. Chlorophyll a where extracted from filtered water samples according to standard methods (ISO 10 260) at the Department of Biology, Norwegian University of Science and Technology. Water samples used for chlorophyll a measures (1 – 2 liters) where kept dark and cool and filtered (Whatmann GF/C) using a suction pump, on the day of collection. Filters where then dried and packed in aluminium foil, wrapped in plastic and immediately frozen at -18 °C at the field lab. The samples where kept frozen until returning to Norway and there stored at -70°C until analysed. Chlorophyll a concentrations where measured by photometrical absorbance at 665 and 750 nm after solving filters in ethanol.

Métadonnées additionnelles