Video Experimental Relacionado
Updated: Aug 4, 2026
16:03
A Fish-feeding Laboratory Bioassay to Assess the Antipredatory Activity of Secondary Metabolites from the Tissues of Marine Organisms
Published on: January 11, 2015
Quebrada jaguay: las primeras adaptaciones marítimas sudamericanas
1D. H. Sandweiss, Department of Anthropology, South Stevens Hall, University of Maine, Orono, ME 04469, USA. H. McInnis, Institute for Quaternary Studies, Bryand Hall, University of Maine, Orono, ME 04469, USA. R. L. Burger, Peabody Museum of Na.
Science (New York, N.Y.)
|September 22, 1998
Resumen
Los pueblos paleoindios en América del Sur utilizaron los recursos marinos a lo largo de la costa durante el Pleistoceno Terminal, extendiendo el registro de la explotación marítima en 1.000 años. Este hallazgo pone de relieve las diversas estrategias de subsistencia y el contacto con las tierras altas andinas.
Área de la Ciencia:
- Arqueología Arqueología.
- Estudios paleoambientales Estudios paleoambientales.
Sus antecedentes:
- El Pleistoceno terminal en América del Sur (aprox. 13,000 11,000 años calibrados BP) es crucial para comprender las primeras adaptaciones humanas.
- Investigaciones anteriores sugirieron un uso limitado de los recursos costeros por parte de las primeras poblaciones de la región.
Objetivo del estudio:
- Investigar las estrategias de subsistencia y los patrones de explotación de recursos de las poblaciones paleoindias en Quebrada Jaguay 280 (QJ-280) en la costa peruana.
- Para determinar el grado de dependencia de los recursos marítimos y el contacto interregional durante el Pleistoceno Terminal.
Principales métodos:
- Excavaciones arqueológicas en el sitio QJ-280.
- Análisis de los restos de la fauna para identificar la utilización de los recursos marinos.
- Búsqueda geoquímica de artefactos de obsidiana para determinar el origen y las redes comerciales.
Principales resultados:
- Evidencia de una dependencia significativa de los recursos marinos por los habitantes paleoindios residentes en la costa.
- Los hallazgos amplían el registro conocido de la explotación marítima sudamericana en aproximadamente un milenio.
- Los artefactos de obsidiana indican contactos establecidos y redes de intercambio con las tierras altas andinas.
Conclusiones:
- Las poblaciones paleoindias en América del Sur exhibieron diversos sistemas de subsistencia, incluida una importante explotación marítima.
- El sitio QJ-280 proporciona evidencia crítica para la adaptación costera temprana y el uso de recursos en América del Sur.
- La evidencia de obsidiana sugiere la interacción entre los grupos costeros y de las tierras altas durante el Pleistoceno Terminal.
Videos de Conceptos Relacionados
00:53Migration
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
00:48Optimal Foraging
How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
01:57Adaptations that Reduce Water Loss
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
02:35What is Evolutionary History?
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.Phylogenetic trees illustrate the evolutionary relationships among these organisms. Scientists infer organisms’ common ancestry by evaluating shared morphological and genetic characteristics. Together, the fossil...
01:30Marine Microbial Ecology
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
01:18Deep Sea Microbial Ecology
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...