{"title":"Jonsvatnet - Norway","id":{"prefix":"https:\/\/deims.org\/","suffix":"b7d763f2-4361-44a3-9adc-dfa89a939ff3"},"type":"site","created":"2014-11-28T11:02:23+01:00","changed":"2023-07-24T15:09:17+02:00","attributes":{"affiliation":{"networks":[{"network":{"name":"LTER Norway","id":{"prefix":"https:\/\/deims.org\/networks\/","suffix":"bc7c517b-3648-40cc-a04c-8c98d009c4a9"}},"siteCode":"LTER_EU_NO_018","verified":false}],"projects":null},"contact":{"siteManager":[{"type":"person","name":"Karstein H\u00e5rsaker","email":"karstein.harsaker@ntnu.no","orcid":null}],"operatingOrganisation":[{"type":"organisation","name":"NTNU University Museum","url":"https:\/\/www.ntnu.edu\/museum\/","ror":null}],"metadataProvider":null,"fundingAgency":null,"siteUrl":null},"general":{"abstract":"This is a long-term monitoring study of freshwater zooplankton and phytoplankton population changes after introduction of the mysid, Mysis relicta Lov\u00e9n, 1862 in lake Jonsvatnet. It is an oligotrophic lake located in central Norway (63\u00b0 22\u2019 N, 10\u00b0 37* E), 150 m above sea level. The lake has three basins divided by narrow sounds with depths of 1 \u2013 3 m. The major basin is Store Jonsvatnet with surface area of 12,4 km2 and the two smaller ones are Lille Jonsvatnet and Kilvatnet with surface areas of 1,6 km2 and 0,8 km2 respectively. The maximum depths of the three basins are 97 m, 37 m and 34 m respectively and the average depth of the lake is 37 m.\r\nMethod: Plankton are sampled at one station in each lake basin. All samples are taken during the period June-October, twice a month in June - August, once a month in September and one sampling of mysids in late October. Zooplankton is sampled with a 1 m long tube sampler (volume 5 l). A vertical column of water extending from 0 to 20 m depth is consistently sampled every 1 m. Samples from 5 m layers are mixed together and treated as one sample. Phytoplankton is sampled with a water sampler (volume 1.6 l). A vertical column of water extending from 0 to 10 m depth is consistently sampled every 1 m. Samples from 5 m layers are mixed together and treated as one sample. Mysis relicta is sampled in Lille Jonsvatnet with vertical net hauls (net opening 1 m2, mesh size 500 \u00b5m) from 1 m above bottom to to the surface.  ","citation":null,"relatedIdentifiers":null,"status":{"label":"Operational","uri":"http:\/\/vocabs.lter-europe.net\/elter_cl\/10772"},"yearEstablished":1977,"yearClosed":null,"relatedSites":[{"typeOfRelationship":{"label":"belongs to","uri":"null"},"listOfSites":[{"type":"site","title":"Tr\u00f8ndelag site cluster - Norway","id":{"prefix":"https:\/\/deims.org\/","suffix":"e40fb493-7926-44c7-8c5c-bc1943adfcdb"},"changed":"2025-03-28T13:27:53+0100"}]}],"siteName":"Jonsvatnet","shortName":"Jonsvatnet","siteType":null,"protectionLevel":null,"landUse":null,"images":[{"url":"https:\/\/deims.org\/sites\/default\/files\/2023-02\/Lille%20Jonsvn%20sommer%202007_0.jpg","alt":"Lake Lille Jonsvatnet Photo: Jan Ivar Koksvik"},{"url":"https:\/\/deims.org\/sites\/default\/files\/2023-02\/Test%20fishing%20with%20gillnets%20in%20Store%20Jonsvatnet_0.jpg","alt":"Test fishing with gillnets in Store Jonsvatnet Photo: Karstein H\u00e5rsaker"},{"url":"https:\/\/deims.org\/sites\/default\/files\/2023-02\/Sampling%20plankton.jpg","alt":"Sampling zooplankton with tube sampler (right) and phytoplankton with water sampler (left) Photo: Per G\u00e4tzschman"}]},"environmentalCharacteristics":{"airTemperature":{"yearlyAverage":null,"monthlyAverage":null,"unit":"\u00b0C","referencePeriod":null},"precipitation":{"yearlyAverage":null,"monthlyAverage":null,"unit":"mm","referencePeriod":null},"biogeographicalRegion":"atlantic","biome":"freshwater_lakes","ecosystemType":[{"label":"Fresh Water Lakes","uri":null},{"label":"Lakes","uri":null},{"label":"Large lakes","uri":null}],"eunisHabitat":null,"landforms":null,"geoBonBiome":["Fresh water lakes"],"geology":null,"hydrology":null,"soils":null,"vegetation":null},"geographic":{"boundaries":null,"coordinates":"POINT (10.59 63.36)","country":["Norway"],"elevation":{"avg":150,"min":150,"max":-1153,"unit":"msl"},"size":{"value":1500,"unit":"ha"},"relatedLocations":null},"focusDesignScale":{"experiments":{"design":null,"scale":null},"observations":{"design":null,"scale":null},"observedProperties":[{"label":"ecosystem parameter","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/20939"},{"label":"secchi depth","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22226"},{"label":"sight depth","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22238"},{"label":"water colour","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/10390"},{"label":"water parameter","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/20945"},{"label":"water temperature","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/22313"},{"label":"zooplankton abundance","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/30019"},{"label":"zooplankton biomass","uri":"http:\/\/vocabs.lter-europe.net\/EnvThes\/30022"}]},"infrastructure":{"accessibleAllYear":false,"accessType":"boat","allPartsAccessible":false,"maintenanceInterval":null,"permanentPowerSupply":false,"operation":{"permanent":false,"notes":null,"siteVisitInterval":null},"notes":null,"collection":null,"data":{"policy":{"url":null,"rights":null,"notes":null}}},"relatedResources":null,"projectRelated":{"lter":{"lterSiteClassification":null}}}}