Literaturdatenbank
Literaturdatenbank |
|
 |
|
Goode, M. J. , Eggs and clutch production of captive graptemys. Paper presented at Proceedings: Conservation, Restoration, and Management of Tortoises and turtles - An International Conference.
Added by: Admin (17 Aug 2008 18:17:17 UTC) |
| Resource type: Proceedings Article BibTeX citation key: Goode1997 View all bibliographic details  |
Categories: General Keywords: Emydidae, Fortpflanzung = reproduction, Graptemys, Graptemys barbouri, Graptemys flavimaculata, Graptemys nigrinoda, Graptemys pulchra, Graptemys versa, Haltung = husbandry, Schildkröten = turtles + tortoises Creators: Goode Collection: Proceedings: Conservation, Restoration, and Management of Tortoises and turtles - An International Conference |
Views: 6/950
Views index: 16% Popularity index: 4% |
| Abstract |
|
Information is presented on egg production in five species of Graptemys. G. flavimaculata: Twenty clutches were produced in six seasons (1982-1987) by a non-growing female (148 mm CL) of unknown age. Clutch size ranged from 2 to 5 with a mean of 3.40 and a mean clutch frequency (CF) of 3.33, egg mass ranged from 10.0 to 17.2 g with a mean of 14.49 g. Twenty-two additional clutches were produced by three young females in the years 1988-1992. These animals grew from a mean CL of 117 mm to 138 mm during that time and produced 22 clutches ranging from 1 to 5 eggs with a mean CS of 2.41 and egg mass ranging from 10.6 to 16.1 g with a mean of 13.25 g. Clutch frequency ranged from 1 to 5. Mean CF was not calculated as all females did not reproduce in each of the seasons. Nesting seasons (n = 10) ranged from 11 December through 28 June, with oviposition date of first clutch ranging from 11 December through 28 May with a mean date of 26 February, and date of last oviposition ranging from 11 April through 28 June with a mean date of 5 June. Mean length of the nesting season for the group was 98 days. G. nigrinoda delticola: A group of 55 females of mean CL 141.8 mm, and in which growth was negligible, produced 91 clutches in the six seasons 1986-1992. Clutch frequency ranged from 1 to 5 with a mean of 3.57; CS ranged from 1 to 7 with a mean of 3.15; and egg mass ranged from 9.8 to 18.2 g with a mean of 14.2 g. Nesting seasons of the group had a mean length of 176 days, with date of oviposition of first clutch ranging from 2 October through 1 February with a mean of 31 November and dates of last clutch ranging from 15 April through 17 June with a mean of 29 May. G. barbouri: In eight seasons, 25 clutches were produced with individual CF ranging from 1 to 4, CS ranged from 1 to 6 with a mean of 3.38 and egg mass ranged from 10.9 to 20.1 g with a mean of 15.13 g. Nesting seasons ranged from 13 March through 25 July. G. pulchra: In five seasons, 13 clutches were produced with individual CF ranging from 1 to 2; CS ranged from 1 to 5 with a mean of 3.54 and egg mass ranged from 11.4 to 20.0 g with a mean of 16.38 g. Nesting seasons ranged from 21 December through 22 June. G. versa: In five seasons, 19 clutches were produced. Individual CF ranged from 1 to 5, CS ranged from 1 to 6 with a mean of 4.63, and egg mass ranged from 8.0 to 14.0 g with a mean of 10.68 g. Nesting season ranged from 19 February through 28 June. Laying dates of first clutches of seasons were much more variable than laying date of last clutch of seasons (e.g., variance of those dates of G. flavimaculata: 63.76-17.72; variance of those dates of G. n. delticola: 60.5-10.94 ). In the series of the non-growing female G. flavimaculata, investment in egg production increased significantly through the first three seasons and remained high in subsequent seasons as represented by increased CF and egg mass and decreased CS (means for first three seasons: CF 2.33, CS 3.86, egg mass 13.96 g, mean annual clutch mass 125.5 g; those for subsequent seasons: CF 4.33, CS 3.15, egg mass 15.16 g, mean annual clutch mass 206.8 g). In the series of G. n. delticola clutches, investment in egg production was uniform in the first three as opposed to subsequent seasons as represented by higher CF and lower CS and egg mass (means for first three seasons: CF 3.40, CS 3.48, egg mass 14.66 g, mean annual clutch mass 179.4 g; those for subsequent seasons: CF 4.40, CS 2.79, egg mass 14.08 g, mean annual clutch mass 172.9 g).
Added by: Admin |