An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Crawford KM, Knight TM.Crawford KM, et al.Oecologia. 2017 Jan;183(1):211-220. doi: 10.1007/s00442-016-3759-2. Epub 2016 Oct 28.Oecologia. 2017.PMID: 27796508