Paleoecological context of Homo aff. erectus (ATE7-1) at Sima del Elefante (late Early Pleistocene, Atapuerca, Spain) inferred from the herpetofaunal assemblage

The Sima del Elefante cave is one of the archaeopaleontological sites located in the karstic complex of Sierra de Atapuerca (Burgos, Spain), which is a remarkable locality for documenting an extensive sequence of human evidence. Within the stratigraphic sequence of the Sima del Elefante site, Level TE7 has yielded one of the oldest human remains recovered to date in western Europe. A hominin mid-face has recently been discovered (specimen ATE7-1), attributed to Homo aff. erectus. In this study, the fossil amphibian and reptile remains directly associated with this hominin are analyzed, described, and used to perform quantitative paleoecological reconstructions. The resulting herpetofaunal assemblage comprises a total of eight species: five anurans (Alytes gr. Alytes obstetricans/Alytes almogavarii, Pelodytes punctatus, Bufo gr. Bufo bufo, Epidalea calamita, and Rana temporaria), two lizards (small-sized Lacertidae indet. and Anguis fragilis), and two snakes (Coronella cf. Coronella austriaca and Vipera sp.). The paleoecological reconstruction was performed using the Mutual Ecogeographic Range method in conjunction with the Uncertain Distribution Area-Occupied Distribution Area technique to obtain temperature and precipitation estimates, and habitat weighting was used to infer the surrounding environment. The climate of TE7 was reconstructed as cool and humid, with an overall pattern concordant with a present-day continental Mediterranean climate, exhibiting similar temperatures and higher precipitation than today for the Sierra de Atapuerca location. The associated landscape evidenced a more humid environment, primarily made up of woodlands and open humid habitats with aquatic and periaquatic areas. The results obtained provide novel insights into the ecological tolerances of early hominins and thus contribute to the growing body of knowledge regarding their subsistence capabilities and behaviors.