Where have all the turtles gone, and why does it matter?

By: , and 



Of the 356 species of turtles worldwide, approximately 61% are threatened or already extinct. Turtles are among the most threatened of the major groups of vertebrates, in general, more so than birds, mammals, fishes or even the much besieged amphibians. Reasons for the dire situation of turtles worldwide include the familiar list of impacts to other species including habitat destruction, unsustainable overexploitation for pets and food, and climate change (many turtles have environmental sex determination). Two notable characteristics of pre-Anthropocene turtles were their massive population sizes and correspondingly high biomasses, the latter among the highest values (over 855 kilograms per hectare) ever reported for animals. As a result of their numerical dominance, turtles have played important roles as significant bioturbators of soils, infaunal miners of sea floors, dispersers and germination enhancers of seeds, nutrient cyclers, and consumers. The collapse of turtle populations on a global scale has greatly diminished their ecological roles.

Publication type Article
Publication Subtype Journal Article
Title Where have all the turtles gone, and why does it matter?
Series title BioScience
DOI 10.1093/biosci/biy095
Volume 68
Issue 10
Year Published 2018
Language English
Publisher Oxford University Press
Contributing office(s) Southwest Biological Science Center
Description 11 p.
First page 771
Last page 781
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