Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Species accumulation curves for Early Eocene pollen assemblages from Stenkul Fiord, the US western interior and the Late Holocene from modern vegetation types of eastern North America. The mixed forest is spread over a wider geographical area than the deciduous forest (electronic supplementary material, figure S1). Therefore, the apparently lower richness of the deciduous forest is an area/geographical artefact only.
