Freshwater Biodiversity: Status, Threats and Conservation. Ecology, Biodiversity and Conservation. By David Dudgeon. Cambridge and New York: Cambridge University Press. $89.99 (hardcover); $44.99 (paper). xvi + 499 p. + 28 pl.; ill.; species and general indexes. ISBN: 978-0-521-76803-0 (hc); 978-0-521-74519-2 (pb). 2020.