Comparisons of Summer and Winter Patterns in Ovarian Development, Plasma Vitellogenin, and Sex Steroids in Female Diamondback Terrapins (Malaclemys terrapin) in Southern Florida

2018 ◽  
Vol 17 (2) ◽  
pp. 227 ◽  
Author(s):  
Jordan Donini ◽  
Chris Lechowicz ◽  
Roldán Valverde
Keyword(s):  
Sex Steroids ◽  
Ovarian Development ◽  
Malaclemys Terrapin ◽  
Southern Florida ◽  
Diamondback Terrapins

Osmoregulation in the Diamondback Terrapin, Malaclemys Terrapin Centrata

1967 ◽  
Vol 46 (1) ◽  
pp. 161-167 ◽  
Author(s):  
P. J. BENTLEY ◽  
W. L. BRETZ ◽  
KNUT SCHMIDT-NIELSEN
Keyword(s):  
Fresh Water ◽  
Solute Concentration ◽  
Diamondback Terrapin ◽  
Malaclemys Terrapin ◽  
Excess Sodium ◽  
Diamondback Terrapins ◽  
Do So

1. While in hypertonic environment diamondback terrapins (Malaclemys centrata) slowly lose water by osmosis through the integument and as urine through the kidney. 2. Small amounts of sodium are gained, probably largely as a result of diffusion through the integument rather than by drinking, and this sodium is principally excreted extrarenally. Nevertheless, the solute concentration in the blood of such turtles increases. 3. When returned to fresh water the animals rehydrate and excrete accumulated excess sodium. 4. In these ways they could undoubtedly survive for extended periods in the absence of fresh water, but it is not clear whether they could do so indefinitely.

scholarly journals Naive Juvenile Diamondback Terrapins: Kin Recognition in Controlled Encounter Experiments

Elements ◽  
2007 ◽  
Vol 3 (1) ◽  
Author(s):  
Brad Macdonald ◽  
Alexis Rife
Keyword(s):  
Social Behavior ◽  
Kin Selection ◽  
Kin Recognition ◽  
Diamondback Terrapin ◽  
Malaclemys Terrapin ◽  
Selection Theory ◽  
Boston College ◽  
Diamondback Terrapins ◽  
Existing Data

Northern diamondback terrapin (<span style="font-family: mceinline;"><em>malaclemys terrapin</em>) turtle </span>hatchlings raised as part of a laboratory headstarting program are the focus of kin recognition studies taking place at Boston College. Experiments examining basking behaviors in 13 trials of familiar kin and 11 trials of unfamiliar non-kin. Familiar kin averaged more aggressive engagements per trial (2.44 vs. 0.36), more displacements per trial (13.36 vs. 3.91), and more instances of climbing on one another (13.36 vs. 2.36). Familiar kin basked in congregations more frequently per trial than unfamiliar non-kin. These data suggest that diamondback terrapins treat each other differently based on either kinship or familiarity-or both. Further research will be conducted on familiar and unfamiliar kin and non-kin groupings to help elucidate the existing data by determining which variable has greater consequence and if Hamilton's kin selection theory can be applied to terrapin juvenile social behavior.

scholarly journals CHARACTERISTICS OF MANGROVE DIAMONDBACK TERRAPINS (MALACLEMYS TERRAPIN RHIZOPHORARUM) INHABITING ALTERED AND NATURAL MANGROVE ISLANDS

2014 ◽  
pp. 76-80
Author(s):  
Brian K. Mealey ◽  
John D. Baldwin ◽  
Greta B. Parks-Mealey ◽  
Gregory D. Bossart ◽  
Michael R.J. Forstner
Keyword(s):  
Site Fidelity ◽  
Mangrove Ecosystem ◽  
Diamondback Terrapin ◽  
Malaclemys Terrapin ◽  
Physical Chemical ◽  
Mangrove System ◽  
Broad Array ◽  
In The Wild ◽  
Biased Sex Ratio ◽  
Diamondback Terrapins

The Mangrove Diamondback Terrapin, (Malaclemys terrapin rhizophorarum) is dependent on a very broad array of the services provided by the mangrove ecosystem. We sought to evaluate both the turtles and their habitat by an integrated assessment of physical, chemical, and physiological parameters. Extreme site fidelity of the turtles to mangrove habitat was evident along with a strong female biased sex ratio. We provide blood serum values and microbial cultures as baselines from these turtles in the wild. Salmonella sp., a potentially zoonotic pathogen, was isolated from one female. Ultimately, the health of these turtle populations may be reflective of the integrity of the mangrove system on which they depend.

Monthly variations in the profile of sex steroids and ovarian development of brook trout (Salvelinus fontinalis Mitchill) during the annual reproductive cycle in Tasmania

2015 ◽  
Vol 63 (3) ◽  
pp. 220 ◽  
Author(s):  
Shafaq Fatima ◽  
Mark Adams ◽  
Ryan Wilkinson
Keyword(s):  
Reproductive Cycle ◽  
Sex Steroids ◽  
Brook Trout ◽  
Ovarian Development ◽  
Gonadosomatic Index ◽  
Annual Reproductive Cycle ◽  
Total Fecundity ◽  
Mature Fish ◽  
Index Value ◽  
Monthly Variations

Control of maturation in all-female salmonid stock can be achieved by manipulating photoperiod. This initially requires an assessment of the annual reproductive cycle under ambient photoperiod. This study therefore describes the seasonal variations in ovarian development and plasma profiles of oestradiol-17β and testosterone during the second year of a population of female brook trout. It was found that fish recruited for maturation following the summer solstice in December. Shortening of photoperiod likely stimulated the brain–pituitary–gonadal axis for vigorous progress of ovarian development, as indicated by increasing levels of oestradiol-17β and gonadosomatic index values. The highest gonadosomatic index value (18.26 ± 1.1%) was observed in June. During July, eggs were released from mature females by manual stripping. Total fecundity was observed as 4266 ± 341 oocytes per mature fish. Profiles of sex steroids observed here were found to be finely entrained within the succession of seasonal photoperiod. This finding indicates that maturation suppression by photoperiod manipulation should be instigated before initiation of oocyte recruitment that commenced during December.

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