. The Canadian field-naturalist. marginafa be//ii picta "^^. Figure \. Ontario study location in the north-central portion of the range of C. p. marginata. Map adapted from Conant (1975). Intergradation occurs in zones of overlap. with occasional opportunistic hand sampling. The nets were regularly relocated in a total of 25 sites within the lower sanctuary. Capture by hand was necessary only for terrestrial samples. Carapace total length and carapace curved length were measured with a flexible metal tape rule accurate to mm. Weight was recorded by placing the animal on
. The Canadian field-naturalist. marginafa be//ii picta "^^. Figure \. Ontario study location in the north-central portion of the range of C. p. marginata. Map adapted from Conant (1975). Intergradation occurs in zones of overlap. with occasional opportunistic hand sampling. The nets were regularly relocated in a total of 25 sites within the lower sanctuary. Capture by hand was necessary only for terrestrial samples. Carapace total length and carapace curved length were measured with a flexible metal tape rule accurate to mm. Weight was recorded by placing the animal on its back in a plastic bucket which was then set on a hanging spring scale precise to 25 g. Sex was determined from the length of the foreclaws. In 1974 each turtle was numbered on the plastron with indelible red ink and when the first animal with an illegible number was recaptured, after approximately 2 months, trapping was discontinued. In the first 3 weeks of June 1975 turtles taken in the nets were marked and released but the main emphasis at that time was observations on shore. In 1975, numbering of individual turtles was accom- plished by notching the marginals with a hacksaw blade (Cagle 1939). Each marginal had been assigned a number so that a notched marginal, or combination of marginals, served to identify turtles in a more permanent manner than the previous year's ink markings. The three characters used by Hartman (1958) to distinguish C. p. marginata from C. p. picta (Schneider) were measured with calipers exact to mm. Alignment of central and lateral laminae was measured and calculated as des- cribed by Hartman (1958) and later by Pough and Pough (1968). One hundred percent dis- alignment describes exact alternation of the laminae as is "typical" in C. p. marginata, while 0% represents the linearly catenated seams "typical" in C. p. picta. The plastral figure, if present, was copied directly onto tracing paper to allow for later experimenta
Size: 1813px × 1379px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorottawafieldnaturalistsclub, bookcentury1900, bookcolle
