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.
Post-Pliocene extinctions for two regional bivalve faunas. Dashed line indicates extinct species and solid line extant species. (a) Scaled geographical range of species. (b) Scaled extinction rate for genera in families. (c) Resulting PERIL score. (d) Survivorship for each fauna. (e) Black points are species that survived to present day, and grey points are extinct species. All panels share the same x-axis scale (from 0 to 1). (Online version in colour.)
