Atrazine (2-chloro-4-ethythlamino-6-isopropylamine-1,3,5-tiazine) is a widely used preemergent herbicide for controlling broadleaf plants. Because atrazine (a known endocrine-disrupting chemical) is applied in the late spring and early summer, its incidental effects on species exposed to runoff from terrestrial sources in this time period are of special interest. To examine the possible secondary impact of atrazine, we obtained eggs from 10 nests of two map turtle species, Graptemys ouachitensis and G. pseudogeographica, that nest on riverine sandbars. We incubated two eggs from each nest in sand containing one of four initial concentrations of atrazine (control and 0.1, 10, and 100 µg/L) based on levels measured in the river at the site where eggs were collected. We recorded hatching success, incubation time, external morphological abnormalities, gonadal sex, three measures of body size, righting time, and swimming time for all turtles. We reared a subset of the original neonates individually for 11 mo, during which time nest escape behavior, time to first foraging event, time to capture prey, growth, and survival were evaluated. None of the variables recorded at hatching was significantly affected by atrazine treatment, although abnormalities declined as atrazine levels increased. However, turtles deriving from the lowest atrazine-treated eggs had inhibited nest escape behavior and reduced posthatching survival. These findings reveal persistent fitness-reducing impacts on neonatal turtles resulting from atrazine exposure during embryonic development.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 67 • No. 1