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Goode, M. J. , Reproduction in captive heosemys grandis. 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: Goode1997a View all bibliographic details  |
Categories: General Keywords: Fortpflanzung = reproduction, Geoemydidae, Haltung = husbandry, Heosemys, Heosemys grandis, Schildkröten = turtles + tortoises Creators: Goode Collection: Proceedings: Conservation, Restoration, and Management of Tortoises and turtles - An International Conference |
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| Abstract |
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Heosemys grandis Geoemya Information is presented concerning egg production in a 15-season period (1978-1993) for a mature animal of unknown age ("old"), and of six progeny females, producing in an aggregate of 14 seasons. Clutch frequency (CF) for the old female was 2 in 13 seasons and 1 in the remaining two seasons. CF of progeny females, in their 5th through 12th year of age, was 2 in five seasons and 1 in nine seasons. Laying dates ranged from 25 October through 11 March in the entire series and did not differ significantly in the "old" and "progeny" series (P >.2 in each paired comparison of dates of CF1 and of 1st clutch or 2nd clutch of CF2). Mean date of clutches laid as CF1 and as 1st clutch of CF2 did not differ (23 December-10 December, P >.1), while dates of 1st and 2nd clutches of CF2 differed significantly (15 December-1 February, P <.001). Clutch size (CS) was larger in progeny females (mean 6.47-5.68 ). Mean size of clutches laid as CF1 were larger than those laid as CF2 in both series, and clutches laid as 2nd of CF2 were larger than those laid as 1st of CF2 in both series (mean for old and progeny: CF1 = 6.00, 6.77; CF2 = 5.65, 6.20; 1st of CF2 = 4.85, 5.80; 2nd of CF2 = 5.69, 6.60). None of these differences was significant at P =.05. Egg mass for the old female was consistent (with records kept only in the last ten seasons) and ranged from 32.8 to 58.3 g (mean 49.92 g, n = 69 eggs ). Eggs laid as CF1 were significantly larger than those laid as CF2 (means 54.17 and 48.82 g, P <.01), and those laid as 1st of CF2 were larger than those laid as 2nd of CF2 (means 52.68 and 48.18 g, P <.001). Progeny females began egg production at similar sizes (276-291 mm CL ) but at differing ages (5 years, 9 months-9 years, 8 months) with faster growing animals producing at younger ages. The first, second, and third reproductive seasons of progeny females was characterized by low CF, high CS, and small egg mass (1st year means CS 6.00, CF 1.17; egg mass 35.21; n = 7 clutches; 2nd + 3rd year means CS 7.20, CF 1.25; egg mass 35.59; n = 5 clutches). Mean annual clutch mass for these years was 246.5 g in the 1st year and 320.9 g in the 2nd + 3rd years. Mean annual clutch mass increased to 471.3 g in the fourth season (mean CS 7.20, CF 1.6; egg mass 39.29 g; n = 5 clutches). Egg production in the fifth season of the progeny females did not differ from that of the old female (progeny and old: mean CS 6.00, 5.68; CF 2.00, 1.86; egg mass 48.02, 49.92 g; annual clutch mass 576.2, 527.4 g; n = 2 clutches of progeny series ).
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