Juvenile-Adult Habitat Shift in Permian Fossil Reptiles and Amphibians

• Published in: Science (American Association for the Advancement of Science) Vol. 217; no. 4554; pp. 53 - 55
• Main Author: Bakker, Robert T.
• Format: Journal Article
• Language: English
• Published: United States The American Association for the Advancement of Science 02-07-1982; American Association for the Advancement of Science
• Subjects: Amber; Amphibians; Amphibians, Fossil; Fossils; Habitat preferences; Paleontology; Prehistoric reptiles; Reptiles; Reptiles, Fossil; Resonance; Sediments; Stream habitats; Swamps; Wildlife habitats
• ISSN: 0036-8075; 1095-9203
• DOI: 10.1126/science.217.4554.53

Among extant large reptiles, juveniles often occupy different habitats from those of adults or subadults and thus avoid competition with and predation from the older animals; small juveniles often choose cryptic habitats because they are vulnerable to a wide variety of predators. Evidence from fossil humeri and femora of Early Permian reptiles collected from sediments of several distinct habitats indicate that similar shifts in habitat occurred. Juvenile Dimetrodon seem to have favored cryptic habitats around swamp and swampy lake margins; adults favored open habitats on the floodplains. Similar patterns of habitat shift seem to be present in the reptile Ophiacodon and the amphibian Eryops and may have been common in fossil tetrapods of the Permian-Triassic.