Marine invertebrate collection NTNU University Museum

负责人：

Bakken, Torkild;;Finstad, Anders Gravbr?t;;Bakken, Torkild;;H?rsaker, Karstein

关键词：

Occurrence Specimen

DOI：

doi:10.15468/ddbs14

摘要：

's (Bakken et al. 2011). Only a handful specimens in the collection date back to this period. From around 1870 an exploration and mapping

Data from: Historical changes in northeastern US bee pollinators related to shared ecological traits

负责人：

关键词：

1870-2011;conservation;Apoidea;pollination crisis

DOI：

doi:10.5061/dryad.0nj49

摘要：

Pollinators such as bees are essential to the functioning of terrestrial ecosystems. However, despite concerns about a global pollinator crisis, long-term data on the status of bee species are limited. We present a long-term study of relative rates of change for an entire regional bee fauna in the northeastern United States, based on >30,000 museum records representing 438 species. Over a 140-y period, aggregate native species richness weakly decreased, but richness declines were significant only for the genus Bombus. Of 187 native species analyzed individually, only three declined steeply, all of these in the genus Bombus. However, there were large shifts in community composition, as indicated by 56% of species showing significant changes in relative abundance over time. Traits associated with a declining relative abundance include small dietary and phenological breadth and large body size. In addition, species with lower latitudinal range boundaries are increasing in relative abundance, a finding that may represent a response to climate change. We show that despite marked increases in human population density and large changes in anthropogenic land use, aggregate native species richness declines were modest outside of the genus Bombus. At the same time, we find that certain ecological traits are associated with declines in relative abundance. These results should help target conservation efforts focused on maintaining native bee abundance and diversity and therefore the important ecosystems services that they provide.

GBIF Occurrence Download

负责人：

关键词：

GBIF biodiversity species occurrences

DOI：

doi:10.15468/dl.zsjpxs

摘要：

Environmental Records Centre - Dorset SSSI Species Records 1952 - 2004 (Natural England). 43 records from dec2011. 32 records from Cambridgeshire &