Egg Size and Shape Variation with̀in and among Nebraskan Painted Turtle (Chrysemys picta bellii) Populations: Relationships to Clutch and Maternal Body Size

Copeia ◽  
1994 ◽  
Vol 1994 (4) ◽  
pp. 1034 ◽  
Author(s):  
John W. Rowe
Keyword(s):  
Body Size ◽  
Egg Size ◽  
Chrysemys Picta ◽  
Painted Turtle ◽  
Shape Variation ◽  
Maternal Body ◽  
Size And Shape ◽  
Chrysemys Picta Bellii

Reproductive ecology of the painted turtle (Chrysemys picta marginata) in southwestern Quebec

1986 ◽  
Vol 64 (4) ◽  
pp. 914-920 ◽  
Author(s):  
Elaine Christens ◽  
J. Roger Bider
Keyword(s):  
Body Size ◽  
Clutch Size ◽  
Egg Size ◽  
Reproductive Ecology ◽  
Substantial Reduction ◽  
Chrysemys Picta ◽  
Painted Turtle ◽  
X Ray ◽  
Painted Turtles ◽  
Old Females

The reproductive ecology of painted turtles (Chrysemys picta marginata) was studied over 3 years (1983–1985) in southwestern Quebec. We used X-ray photography to determine clutch size, egg size, and clutch frequency in conjunction with radiotelemetry to determine when and where the eggs were being deposited. Data on nesting frequency indicated that between 40 and 80% of the 7- to 11-year-old females reproduce each year. All females > 11 years of age reproduced each year and exhibited a substantial reduction in growth compared with younger adult females. The percentage of those females that layed two clutches in a season ranged from 5 to 32%. There was no difference in the size of the first and second clutches or those produced by females only laying one clutch. The average clutch size was found to be 9.2 (range, 5–12) eggs. There was no significant relationship between clutch size and body size, between clutch size and age, or between clutch size and egg size. There was a significant positive linear relationship between egg size and body size. Age-specific fecundity increased up to 20 years of age and then decreased. When compared to studies of more southern populations of painted turtles, the major reproductive strategy for this population seems to be to produce a larger number of large eggs per clutch.

Response of protein synthesis to anoxia and recovery in anoxia-tolerant hepatocytes

1993 ◽  
Vol 265 (1) ◽  
pp. R41-R48 ◽  
Author(s):  
S. C. Land ◽  
L. T. Buck ◽  
P. W. Hochachka
Keyword(s):  
Protein Synthesis ◽  
Chrysemys Picta ◽  
Painted Turtle ◽  
Urea Synthesis ◽  
O2 Consumption ◽  
Purine Nucleotide ◽  
Turnover Rates ◽  
Atp Turnover ◽  
Chrysemys Picta Bellii ◽  
Metabolic Suppression

Hepatocytes from the western painted turtle (Chrysemys picta bellii) display a profound metabolic suppression under anoxia. Fractional rates of protein synthesis fell by 92% during 12 h anoxia at 25 degrees C and were indistinguishable from the rate obtained with cycloheximide. Normoxic recovery saw protein synthesis increase to 160% of control values and return to normal after 2 h. The GTP-to-GDP ratio, implicated in the control of translation, fell threefold during anoxia. Purine nucleotide phosphate profiles suggest that this change occurs through increasing concentrations of ADP and GDP, with concentrations of ATP and GTP and total purines remaining constant. The normoxic cost for protein synthesis was calculated at 47.6 +/- 6.8 mmol ATP/g protein. Normoxic protein synthesis accounted for 36% of overall ATP turnover rates, close to the extent of O2 consumption inhibitable by cycloheximide (28%). Under anoxia, the proportion of ATP turnover utilized by protein synthesis did not change significantly. ATP turnover rates for urea synthesis reflected a similar pattern, falling 72% under anoxia. These results reflect the cell's ability to suppress protein synthesis under anoxia in a manner that is coordinated with the reduction in total metabolic rate.

Proteomic changes in the brain of the western painted turtle (Chrysemys picta bellii ) during exposure to anoxia

PROTEOMICS ◽  
2015 ◽  
Vol 15 (9) ◽  
pp. 1587-1597 ◽  
Author(s):  
Richard W. Smith ◽  
Phil Cash ◽  
David W. Hogg ◽  
Leslie T. Buck
Keyword(s):  
Chrysemys Picta ◽  
Painted Turtle ◽  
Chrysemys Picta Bellii ◽  
The Brain

Contrasting reproductive strategies in a narrow latitude range: the case of D’Orbigny’s slider

2017 ◽  
Vol 38 (4) ◽  
pp. 425-434
Author(s):  
Priscila Silva Lucas ◽  
Alex Bager
Keyword(s):  
Body Size ◽  
Clutch Size ◽  
Evolutionary Biology ◽  
Egg Size ◽  
Life History Theory ◽  
Geographical Area ◽  
Size Variation ◽  
Reproductive Traits ◽  
Maternal Body ◽  
Trade Offs

Reproductive traits and the level of parental investment in offspring varies between individuals and species. These are central issues in life history theory and evolutionary biology. Maternal body size plays an important role in reproduction, and we usually observe variable investment in offspring by females. Thus, optimal egg size may not be reached in some populations or species. In this study, we tested if reproductive traits differed between populations of D’Orbigny’s slider in a specific geographical area in Brazil. We evaluated the relationship between reproductive traits to maternal body size and clutch size to egg size to determine possible trade-offs across populations. At the population level, maternal body size and reproductive traits of D’Orbigny’s slider were different even in geographically nearby areas. Maternal body size had a positive effect on clutch size, but not on egg size, except in the Arroio Grande population. Nevertheless, we did not observe a negative correlation between clutch and egg size in any population. Although maternal body size had effects in the different populations explaining most of the variation of clutch size, variation in egg size may be the result of decreased survival chances in unpredictable environments and possibly morphological constraints. The trade-off between egg size and number was not observed and this could be expected if resource availability and reproductive allocation by females vary greatly among individuals.

scholarly journals Skeletal Muscle Histidine Containing Dipeptide Contents are Increased in Freshwater Turtles (Chrysemys picta bellii) with Cold-Acclimation

2021 ◽  
Author(s):  
Eimear Dolan ◽  
Daniel E Warren ◽  
Roger C Harris ◽  
Craig Sale ◽  
Bruno Gualano ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Temperature Sensitivity ◽  
Ph Regulation ◽  
Chrysemys Picta ◽  
Painted Turtle ◽  
Freshwater Turtles ◽  
Acid Base ◽  
Cold Temperatures ◽  
Chrysemys Picta Bellii ◽  
Buffering Power

Freshwater turtles found in higher latitudes can experience extreme challenges to acid-base homeostasis while overwintering, due to a combination of cold temperatures along with the potential for environmental hypoxia. Histidine containing dipeptides (HCDs; carnosine, anserine and balenine) may facilitate pH regulation in response to these challenges, through their role as pH buffers. We measured the HCDs content of three tissues (liver, cardiac muscle and skeletal muscle) from the anoxia-tolerant painted turtle (Chrysemys picta bellii) acclimated to either 3 or 20 C. HCDs were detected in all tissues, with the highest content shown in the skeletal muscle. Turtles acclimated to 3 C had more HCD in their skeletal muscle than those acclimated to 20 C (carnosine = 20.8 +/- 4.5 vs 12.5 +/- 5.9 mmol/kg DM; ES = 1.59 (95%CI: 0.16 - 3.00), P = 0.013). The higher HCD content observed in the skeletal muscle of the cold-acclimated turtles suggests a role in acid-base regulation in response to physiological challenges associated with living in the cold, with the increase possibly related to the temperature sensitivity of carnosine's dissociation constant and buffering power of the skeletal muscle during anoxic submergence.

Sign in / Sign up

Export Citation Format

Share Document