Comparative skull analysis suggests species-specific captivity-related malformation in lions (Panthera leo).
Lion (Panthera leo) populations have dramatically decreased worldwide with a surviving population estimated at 32,000 across the African savannah. Lions have been kept in captivity for centuries and, although they reproduce well, high rates of stillbirths as well as morbidity and mortality of neonate and young lions are reported. Many of these cases are associated with bone malformations, including foramen magnum (FM) stenosis and thickened tentorium cerebelli. The precise causes of these malformations and whether they are unique to captive lions remain unclear. To test whether captivity is associated with FM stenosis, we evaluated 575 lion skulls of wild (N = 512) and captive (N = 63) origin. Tiger skulls (N = 276; 56 captive, 220 wild) were measured for comparison. While no differences were found between males and females or between subadults and adults in FM height (FMH), FMH of captive lions (17.36±3.20 mm) was significantly smaller and with greater variability when compared to that in wild lions (19.77±2.11 mm). There was no difference between wild (18.47±1.26 mm) and captive (18.56±1.64 mm) tigers in FMH. Birth origin (wild vs. captive) as a factor for FMH remained significant in lions even after controlling for age and sex. Whereas only 20/473 wild lions (4.2%) had FMH equal to or smaller than the 5th percentile of the wild population (16.60 mm), this was evident in 40.4% (23/57) of captive lion skulls. Similar comparison for tigers found no differences between the captive and wild populations. Lions with FMH equal to or smaller than the 5th percentile had wider skulls with smaller cranial volume. Cranial volume remained smaller in both male and female captive lions when controlled for skull size. These findings suggest species- and captivity-related predisposition for the pathology in lions.
Department of Reproduction Management, Leibniz Institute for Zoo and Wildlife Research, Berlin, Germany.
Joseph
J
Saragusty
Koret School of Veterinary Medicine, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel.
Anat
A
Shavit-Meyrav
Wildlife Conservation Research Unit, Department of Zoology, University of Oxford, Tubney, Abingdon, United Kingdom.
Nobuyuki
N
Yamaguchi
Zoological Center Tel Aviv-Ramat Gan, Ramat Gan, Israel.
Rona
R
Nadler
Koret School of Veterinary Medicine, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel.
Tali
T
Bdolah-Abram
NYC Veterinary Specialists, New York, New York, United States of America.
Laura
L
Gibeon
Department of Reproduction Management, Leibniz Institute for Zoo and Wildlife Research, Berlin, Germany.
Thomas B
TB
Hildebrandt
Koret School of Veterinary Medicine, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel.
Merav H
MH
Shamir
D000818:Animals; D005260:Female; D005539:Foramen Magnum / Q000002:abnormalities; D008045:Lions / Q000033:anatomy & histology*; D008297:Male; D012886:Skull / Q000002:abnormalities*; D013045:Species Specificity; D046010:Tigers / Q000033:anatomy & histology