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Climate (in)stability can manifest in the size of mollusks attesting to variable impacts on growth, seasonal exploitation, and cultural persistence. We present population statistics of the height of a bivalve species (Donax obesulus) collected from sites dating to the Early Horizon (EH, 900?200 BCE) in the Nepeña Valley and the Middle Horizon (MH, 600?1000 CE) in the Jequetepeque Valley of northern coastal Peru and compare them with a paleoclimate record and a sample of modern shells (collected in 2012, 2014, and 2016) from the Nepeña Valley. We observe diachronic variation in the size of D. obesulus with larger bivalves during the EH and smaller shells during the MH and in the modern sample. D. obesulus size remains relatively static during the MH at one site through two sub-phases. These bivalve populations were likely impacted by both climate and cultural circumstances. A proxy for runoff from El Niño related rainfall (%lithic flux) from a previously published nearby marine sediment core is elevated during the EH and Late Moche phase of the MH and correlates with shell height. During the Transitional phase of the MH and the modern interval, however, there are periods of comparatively reduced El Niño activity and shell height compared to the EH. 

Michael Moseley emphasized the importance of maritime resources to the development of social complexity in the Andean region in his theory of the Maritime Foundations of Andean Civilization (1975), which became a central (and controversial) text in the field. This volume builds on his and others’ foundational work and asks, “how did ancient Andean coastal communities build themselves, and their identities, around their proximity to the Pacific Ocean”? 

ABSTRACT Sea urchins are premier model organisms for the study of early development. However, the lengthy generation times of commonly used species have precluded application of stable genetic approaches. Here, we use the painted sea urchin Lytechinus pictus to address this limitation and to generate a homozygous mutant sea urchin line. L. pictus has one of the shortest generation times of any currently used sea urchin. We leveraged this advantage to generate a knockout mutant of the sea urchin homolog of the drug transporter ABCB1, a major player in xenobiotic disposition for all animals. Using CRISPR/Cas9, we generated large fragment deletions of ABCB1 and used these readily detected deletions to rapidly genotype and breed mutant animals to homozygosity in the F2 generation. The knockout larvae are produced according to expected Mendelian distribution, exhibit reduced xenobiotic efflux activity and can be grown to maturity. This study represents a major step towards more sophisticated genetic manipulation of the sea urchin and the establishment of reproducible sea urchin animal resources. 

Are the islands off the coast of California “marginal” environments? How could seemingly “depauperate” places have sustained human settlements for thousands of years? In An Archaeology of Abundance: Reevaluating the Marginality of California’s Islands, edited by Kristina M. Gill, Mikael Fauvelle, and Jon M. Erlandson, archaeologists and other scholars argue that our understanding of the resource bases of the California islands is biased by years of Euroamerican impacts. By integrating archaeological and ethnohistoric data with paleoecological reconstructions, the authors reexamine life on these islands before European contact and subsequent environmental degradation.