Placental specializations of the mountain spiny lizard Sceloporus jarrovi

2010 ◽  
Vol 271 (10) ◽  
pp. 1153-1175 ◽  
Author(s):  
Daniel G. Blackburn ◽  
Gregory S. Gavelis ◽  
Kristie E. Anderson ◽  
Amy R. Johnson ◽  
Kent D. Dunlap
Keyword(s):  
Sceloporus Jarrovi

Testosterone and Daily Activity Period in Laboratory-Housed Mountain Spiny Lizards, Sceloporus jarrovi

2004 ◽  
Vol 38 (1) ◽  
pp. 120-124 ◽  
Author(s):  
Matthew Klukowski ◽  
Betty Ackerson ◽  
Craig E. Nelson
Keyword(s):  
Daily Activity ◽  
Activity Period ◽  
Sceloporus Jarrovi

Survivorship in a High-Elevation Population of Sceloporus jarrovi during a Period of Drought

Copeia ◽  
1994 ◽  
Vol 1994 (4) ◽  
pp. 1040 ◽  
Author(s):  
Geoffrey R. Smith ◽  
Royce E. Ballinger
Keyword(s):  
High Elevation ◽  
Sceloporus Jarrovi

Supercooling in the Iguanid Lizard Sceloporus jarrovi

1979 ◽  
Vol 52 (2) ◽  
pp. 190-204 ◽  
Author(s):  
E. Annette Halpern
Keyword(s):  
Sceloporus Jarrovi

Allometry of the kidney: implications for the ontogeny of osmoregulation

1988 ◽  
Vol 255 (5) ◽  
pp. R760-R767 ◽  
Author(s):  
C. A. Beuchat ◽  
E. J. Braun
Keyword(s):  
Body Mass ◽  
Significant Role ◽  
Allometric Relationship ◽  
Ion Balance ◽  
Short Period ◽  
Sceloporus Jarrovi ◽  
Metanephric Kidney ◽  
Short Time

In reptiles, there are two pairs of kidneys at birth: the mesonephros and the metanephros. The metanephric kidney in reptiles, as in all amniote vertebrates, is retained as the functional kidney in adults. However, the reptilian mesonephros does not degenerate until after birth, and its function during this time is unknown. In neonates of the iguanid lizard Sceloporus jarrovi, the metanephric kidney is only 63% as large as predicted from the allometric relationship between kidney mass and body mass in adults. However, the kidney mass of neonatal lizards conforms to this prediction if the mesonephric and metanephric masses are combined. Some other amniote vertebrates appear to follow this pattern as well: in marsupials, which retain the mesonephros for a short period after birth, the sum of mesonephric and metanephric mass in neonates conforms to the allometry of kidney mass on body mass for adults. In contrast, the mesonephros of eutherian mammals is degenerate at birth and the metanephric kidney alone is of the predicted size. That the scaling of kidney mass in neonatal lizards and marsupials is the same as that of adults only if the mass of both the mesonephros and metanephros are combined suggests that the mesonephric kidney in these vertebrates plays a significant role in the regulation of water and ion balance during development and for at least a short time after birth.

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