Evidence of determinate growth in an American alligator ( Alligator mississippiensis ) based on long‐term recapture and osteohistological confirmation

2021 ◽  
Author(s):  
Thomas R. Rainwater ◽  
Holly N. Woodward ◽  
Allan R. Woodward ◽  
Philip M. Wilkinson
Keyword(s):  
Alligator Mississippiensis ◽  
American Alligator ◽  
Determinate Growth

Determinate Growth and Reproductive Lifespan in the American Alligator (Alligator mississippiensis): Evidence from Long-term Recaptures

Copeia ◽  
2016 ◽  
Vol 104 (4) ◽  
pp. 843-852 ◽  
Author(s):  
Philip M. Wilkinson ◽  
Thomas R. Rainwater ◽  
Allan R. Woodward ◽  
Erin H. Leone ◽  
Cameron Carter
Keyword(s):  
Alligator Mississippiensis ◽  
American Alligator ◽  
Determinate Growth

scholarly journals Rib kinematics during lung ventilation in the American alligator (Alligator mississippiensis): an XROMM analysis

2017 ◽  
Vol 220 (17) ◽  
pp. 3181-3190 ◽  
Author(s):  
Robert J. Brocklehurst ◽  
Sabine Moritz ◽  
Jonathan Codd ◽  
William I. Sellers ◽  
Elizabeth L. Brainerd
Keyword(s):  
Lung Ventilation ◽  
Alligator Mississippiensis ◽  
American Alligator

Production of superoxide ions by leukocytes of the American alligator (Alligator mississippiensis)

2009 ◽  
Vol 152 (1) ◽  
pp. 67-71 ◽  
Author(s):  
Mark Merchant ◽  
Stetson Williams ◽  
Ross Hardy
Keyword(s):  
Alligator Mississippiensis ◽  
American Alligator

Pelvic aspiration in the American alligator (Alligator mississippiensis)

2000 ◽  
Vol 203 (11) ◽  
pp. 1679-1687 ◽  
Author(s):  
C.G. Farmer ◽  
D.R. Carrier
Keyword(s):  
Electrical Activity ◽  
Lung Ventilation ◽  
Rectus Abdominis ◽  
Transversus Abdominis ◽  
Alligator Mississippiensis ◽  
Abdominal Pressure ◽  
American Alligator ◽  
Diaphragmatic Breathing ◽  
Pelvic Muscles

The pelvis of crocodilians is highly derived in that the pubic bones are isolated from the acetabulum and are attached to the ischia via moveable joints. We examined the possible role of this unusual morphology in lung ventilation by measuring ventilation, abdominal pressure and the electrical activity of several abdominal and pelvic muscles in the American alligator (Alligator mississippiensis). We found that the activity of two pelvic muscles, the ischiopubis and ischiotruncus muscles, was correlated with inspiration; these muscles rotate the pubes ventrally and thereby increase abdominal volume. During expiration, contraction of the rectus abdominis and transversus abdominis rotates the pubes dorsally. We suggest that this mechanism facilitates diaphragmatic breathing by creating space for caudal displacement of the viscera during inspiration. Because birds also use a dorso-ventral movement of the pelvis to effect ventilation, some form of pelvic aspiration may be plesiomorphic for archosaurs.

Intracranial pressure in the American Alligator (Alligator mississippiensis): reptilian meninges and orthostatic gradients

2019 ◽  
Vol 206 (1) ◽  
pp. 45-54
Author(s):  
Tatyana Kondrashova ◽  
Joshua Blanchard ◽  
Lucas Knoche ◽  
James Potter ◽  
Bruce A. Young
Keyword(s):  
Intracranial Pressure ◽  
Alligator Mississippiensis ◽  
American Alligator

scholarly journals Influence of tissue, age, and environmental quality on DNA methylation in Alligator mississippiensis

Reproduction ◽  
2014 ◽  
Vol 147 (4) ◽  
pp. 503-513 ◽  
Author(s):  
Benjamin B Parrott ◽  
John A Bowden ◽  
Satomi Kohno ◽  
Jessica A Cloy-McCoy ◽  
Matthew D Hale ◽  
...  
Keyword(s):  
Dna Methylation ◽  
Whole Blood ◽  
Epigenetic Modification ◽  
Alligator Mississippiensis ◽  
Sentinel Species ◽  
Global Dna Methylation ◽  
American Alligator ◽  
Global Methylation ◽  
Contaminant Exposure ◽  
Liquid Chromatography Tandem Mass

Epigenetic modifications are key mediators of the interactions between the environment and an organism's genome. DNA methylation represents the best-studied epigenetic modification to date and is known to play key roles in regulating transcriptional activity and promoting chromosome stability. Our laboratory has previously demonstrated the utility of the American alligator (Alligator mississippiensis) as a sentinel species to investigate the persistent effects of environmental contaminant exposure on reproductive health. Here, we incorporate a liquid chromatography–tandem mass spectrometry method to directly measure the total (global) proportion of 5-methyl-2′-deoxycytidine (5mdC) in ovarian and whole blood DNA from alligators. Global DNA methylation in ovaries was significantly elevated in comparison with that of whole blood. However, DNA methylation appeared similar in juvenile alligators reared under controlled laboratory conditions but originating from three sites with dissimilar environmental qualities, indicating an absence of detectable site-of-origin effects on persistent levels of global 5mdC content. Analyses of tissues across individuals revealed a surprising lack of correlation between global methylation levels in blood and ovary. In addition, global DNA methylation in blood samples from juvenile alligators was elevated compared with those from adults, suggesting that age, as observed in mammals, may negatively influence global DNA methylation levels in alligators. To our knowledge, this is the first study examining global levels of DNA methylation in the American alligator and provides a reference point for future studies examining the interplay of epigenetics and environmental factors in a long-lived sentinel species.

Methyltestosterone alters sex determination in the American alligator (Alligator mississippiensis)

2016 ◽  
Vol 236 ◽  
pp. 63-69 ◽  
Author(s):  
Christopher M. Murray ◽  
Michael Easter ◽  
Mark Merchant ◽  
Justin L. Rheubert ◽  
Kelly A. Wilson ◽  
...  
Keyword(s):  
Sex Determination ◽  
Alligator Mississippiensis ◽  
American Alligator
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