The relative importance of phylogeny and habitat in determining the presence and prominence of a granula iridica in hooved mammals.
Vet Ophthalmol
; 23(3): 472-479, 2020 May.
Article
en En
| MEDLINE
| ID: mdl-32012413
ABSTRACT
PURPOSE:
To investigate the relationship between phylogeny and amount of shade in a species' habitat regarding the presence or absence of an iridal granula iridica (GI) in a large sample of Artiodactyl and Perissodactyl clades and using online resources.METHODS:
The Comparative Ocular Pathology Laboratory of Wisconsin (COPLOW) archives were searched for glass slide material from Artiodactyl (even-toed) and Perissodactyl (odd-toed) ungulates. The slides were examined, and the presence or absence of the GI was noted. The phylogenetic tree of the ungulate species was inferred using TimeTree (http//www.timetree.org), and the habitat data are derived from Animal Diversity Web (https//animaldiversity.org/). We assessed the probability of the presence of GI occurring given the amount of shade in a species' environment using phylogenetic logistic regression.RESULTS:
Forty-eight artiodactyl species were able to be evaluated and tabulated. Nine perissodactyl species were able to be evaluated. The phylogenetic logistic regression showed that the probability of GI presence was lower in artiodactyl species that inhabited shaded environments (ßshaded = -1.774). Arctiodacyl species inhabiting a nonshaded environment were slightly more probable to have the GI present (ßnonshaded = 0.023), with species inhabitating ambiguously shaded environments having a high probability of GI presence (ßambiguous = 2.214).CONCLUSIONS:
Our results suggest that the GI may be a common morphological feature to shade the pupil in nonshaded environments, and, in its absence, increase the amount of light reaching the retina to improve vision in shaded environments for hooved mammals. Further research on the functional optics of the GI and studies that include additional ungulate species would further elucidate phylogenetic and ecological factors influencing the occurrence of GI in hooved mammals.Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Rumiantes
/
Iris
Límite:
Animals
Idioma:
En
Revista:
Vet Ophthalmol
Asunto de la revista:
MEDICINA VETERINARIA
/
OFTALMOLOGIA
Año:
2020
Tipo del documento:
Article
País de afiliación:
Estados Unidos