AbstractIt is generally assumed that ectothermic vertebrates show a reversed Bergmann’s cline, but several studies suggest the opposite for turtles. Here, we assess this issue using the widely distributed European pond turtle (Emys orbicularis), which displays strong geographic size variation. We tested carapace lengths of more than 2000 individuals from the entire distribution range against latitude and climatic factors and estimated the effects of those on female-specific traits such as clutch size and frequency. Also, we compared our data against Pleistocene (Eemian) E. orbicularis from Germany. Regional fluctuations of temperature and precipitation are better predictors of body size than latitudinal temperature clines, especially in females. In addition, female body size, activity period and nesting season might be correlated, as small southern females lay several smaller clutches per season, whereas larger-bodied northern females produce only a single large clutch. In conclusion, although climatic conditions appear to have an effect on the body size of E. orbicularis, the species does not follow Bergmann’s rule. Moreover, comparison of extant and fossil E. orbicularis from Germany revealed that fossil pond turtles were generally smaller than extant conspecifics from the same region.
Biological Journal of the Linnean Society – Oxford University Press
Published: Oct 1, 2017
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera