zooplankton and phytoplankton interactions. Northeast Greenland 2013

Registros

Los datos en este recurso de evento de muestreo han sido publicados como Archivo Darwin Core(DwC-A), el cual es un formato estándar para compartir datos de biodiversidad como un conjunto de una o más tablas de datos. La tabla de datos del core contiene 756 registros.

también existen 2 tablas de datos de extensiones. Un registro en una extensión provee información adicional sobre un registro en el core. El número de registros en cada tabla de datos de la extensión se ilustra a continuación.

Este IPT archiva los datos y, por lo tanto, sirve como repositorio de datos. Los datos y los metadatos del recurso están disponibles para su descarga en la sección descargas. La tabla versiones enumera otras versiones del recurso que se han puesto a disposición del público y permite seguir los cambios realizados en el recurso a lo largo del tiempo.

Versiones

La siguiente tabla muestra sólo las versiones publicadas del recurso que son de acceso público.

¿Cómo referenciar?

Los usuarios deben citar este trabajo de la siguiente manera:

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

Derechos

Los usuarios deben respetar los siguientes derechos de uso:

El publicador y propietario de los derechos de este trabajo es Norwegian University of Science and Technology. Esta obra está bajo una licencia Creative Commons de Atribución/Reconocimiento (CC-BY 4.0).

Registro GBIF

Este recurso ha sido registrado en GBIF con el siguiente UUID: a855a639-cccb-4286-af92-f7567d74a887.  Norwegian University of Science and Technology publica este recurso y está registrado en GBIF como un publicador de datos avalado por GBIF Norway.

Palabras clave

Samplingevent

Contactos

Cobertura geográfica

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

Cobertura temporal

Métodos de muestreo

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.

Descripción de la metodología paso a paso:

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.

Metadatos adicionales