Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "hsv:(SAMHÄLLSVETENSKAP) ;lar1:(nrm)"

Sökning: hsv:(SAMHÄLLSVETENSKAP) > Naturhistoriska riksmuseet

  • Resultat 1-4 av 4
Sortera/gruppera träfflistan
  • Blicharska, Malgorzata, et al. (författare)
  • Is there a relationship between socio-economic factors and biodiversity in urban ponds? A study in the city of Stockholm
  • 2017
  • Ingår i: Urban Ecosystems. - 1083-8155 .- 1573-1642. ; 20:6, s. 1209-1220
  • Tidskriftsartikel (refereegranskat)abstract
    • Urban small water bodies, such as ponds, are essential elements of human socio-economic landscapes. Ponds also provide important habitats for species that would otherwise not survive in the urban environment. Knowledge on the biodiversity of urban ponds and the relationship between their ecological value and factors linked to urbanization and socio-economic status is crucial for decisions on where and how to establish and manage ponds in cities to deliver maximum biodiversity benefits. Our study investigates if the pattern of urban-pond biodiversity can be related to different socio-economic factors, such as level of wealth, education or percentage of buildings of different types. Because of lack of previous studies investigating that, our study is of exploratory character and many different variables are used. We found that the biodiversity of aquatic insects was significantly negatively associated with urbanisation variables such as amount of buildings and number of residents living around ponds. This relationship did not differ depending on the spatial scale of our investigation. In contrast, we did not find a significant relationship with variables representing socio-economic status, such as education level and wealth of people. This latter result suggests that the socio-economic status of residents does not lead to any particular effect in terms of the management and function of ponds that would affect biodiversity. However, there is a need for a finer-scale investigation of the different potential mechanism in which residents in areas with differing socio-economic status could indirectly influence ponds.
  • Vajda, Vivi, 1963-, et al. (författare)
  • Palynostratigraphy of dinosaur footprint-bearing deposits from the Triassic-Jurassic boundary interval of Sweden
  • 2013
  • Ingår i: GFF. - Taylor & Francis. - 2000-0863. ; 135:1, s. 120-130
  • Tidskriftsartikel (refereegranskat)abstract
    • The Triassic-Jurassic boundary (c. 200Ma) marks one of the five largest Phanerozoic mass extinction events and is characterized by a major turnover in biotas. A palynological study of sedimentary rock slabs bearing dinosaur footprints from Rhaeto-Hettangian strata of Skane, Sweden was carried out. The theropod dinosaur footprints (Kayentapus soltykovensis) derive from the southern part of the abandoned Vallakra quarry (Hoganas Formation) and were originally dated as earliest Jurassic (Hettangian) based on lithostratigraphy. Our results reveal that two of the footprints are correlative with the latest Triassic (latest Rhaetian) disaster zone typified by a high abundance of the enigmatic gymnosperm pollen Ricciisporites tuberculatus and Perinopollenites elatoides together with the key taxon Limbosporites lundbladii and fern spores. Two footprints are dated to correlate with the Transitional Spore-spike Interval. One footprint is interpreted as Hettangian in age based on the relatively high abundance of Pinuspollenites spp. together with the presence of the key taxa Retitriletes semimuris and Zebrasporites intercriptus. Our new palynological study suggests that the Kayentapus ichnogenus already appeared in the end of Triassic, and our study highlights the use of palynology as a powerful tool to date historical collections of fossils in museums, universities and elsewhere. The Hettangian footprint reflects a marine influence while all other studied ichnofossil specimens occur in non-marine (floodplain and delta interdistributary) sediments. The sediments associated with the Hettangian footprint include a significant proportion of charcoal transported from land after wildfires. The Rhaeto-Hettangian vegetation was otherwise characterized by multi-storey gymnosperm-pteridophyte communities.
Skapa referenser, mejla, bekava och länka
  • Resultat 1-4 av 4
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy