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.
Porcar-Castell A, Garcia-Plazaola JI, Nichol CJ, Kolari P, Olascoaga B, Kuusinen N, Fernández-Marín B, Pulkkinen M, Juurola E, Nikinmaa E.Porcar-Castell A, et al.Oecologia. 2012 Oct;170(2):313-23. doi: 10.1007/s00442-012-2317-9. Epub 2012 Apr 6.Oecologia. 2012.PMID: 22481306