| intersexual allometry differences and ontogenetic shifts of coloration patterns in two aquatic turtles, graptemys oculifera and graptemys flavimaculata. | coloration can play critical roles in a species' biology. the allometry of color patterns may be useful for elucidating the evolutionary mechanisms responsible for shaping the traits. we measured characteristics relating to eight aspects of color patterns from graptemys oculifera and g. flavimaculata to investigate the allometric differences among male, female, and unsexed juvenile specimens. additionally, we investigated ontogenetic shifts by incorporating the unsexed juveniles into the male an ... | 2015 | 26078863 |
| reproductive parameters in female yellow-blotched map turtles (graptemys flavimaculata) from a historically contaminated site vs. a reference site. | graptemys flavimaculata, the yellow-blotched map turtle, is a long-lived, threatened, species, endemic to the pascagoula river drainage in mississippi. during the 1980s, one branch of the drainage (i.e. the leaf river) was impacted by effluent from a wood pulp processing plant known to contain endocrine disrupters. a decade later, we examined seasonal reproductive parameters (i.e. monthly plasma estradiol-17beta (e(2)), testosterone (t), vitellogenin (vtg) and follicular development) in adult fe ... | 2009 | 19651226 |
| comparison of reproductive parameters in male yellow-blotched map turtles (graptemys flavimaculata) from a historically contaminated site and a reference site. | from may to september of 1998, we collected monthly plasma samples from male yellow-blotched map turtles captured at two sites in the pascagoula river drainage, mississippi. one site (vancleave) has a documented history of pollution from industrial sources (principally 2,3,7,8-tetrachlorodibenzo-p-dioxin, tcdd). fish consumption advisories at the vancleave site were lifted in 1996 and current impacts appear minimal. however, the yellow-blotched map turtle, a federally protected species, continue ... | 2001 | 11461839 |
| seasonal variation in reproductive steroids of male and female yellow-blotched map turtles, graptemys flavimaculata. | from april to october of 1996 and 1997, we measured seasonal changes in plasma testosterone (t) in male and plasma t and estradiol-17beta (e(2)) in female yellow-blotched map turtles, graptemys flavimaculata, from the pascagoula river, mississippi. in 1996, plasma from females was analyzed for progesterone. in 1997, ovaries of adult females were ultrasound imaged to determine stages of follicular development. males exhibited peak t levels in september and october of both years, indicating fall g ... | 2000 | 10882548 |