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Assateague Island Seabeach Amaranth Survey Data — 2001 to 2018 Assateague Island Seabeach Amaranth Survey Data — 2001 to 2018
Seabeach amaranth (Amaranthus pumilus) is a plant species that was once prevalent on beaches of the U.S. mid-Atlantic coast but is now listed as threatened by the U.S. Fish and Wildlife Service. For much of the 20th century, seabeach amaranth was absent from the mid-Atlantic coast and thought to be extinct, presumably as a result of increased development and recreational pressure. One...
Argon geochronology results for Reconnaissance basement geology and tectonics of North Zealandia Argon geochronology results for Reconnaissance basement geology and tectonics of North Zealandia
The data are the results of mass spectrometer experiments to measure 40Ar/39Ar ages of groundmass and mineral separates from volcanic rocks in offshore New Zealand. The data were collected using a MAP216 noble gas mass spectrometer at the USGS facility in Menlo Park, California
Rainfed and Irrigated Cropland Areas for Africa Rainfed and Irrigated Cropland Areas for Africa
Agriculture consumes the largest share of freshwater globally, therefore, distinguishing between rainfed and irrigated croplands is essential for agricultural water management and food security. Yet in Africa, disaggregating croplands is challenging due to the continent's vast size, diverse climates, and varied agricultural practices. In this study, a framework using the Budyko model was...
Optimal harvest of a theoretical population under system change Optimal harvest of a theoretical population under system change
This code solves optimal harvest policies under different scenarios of system change, represented as changes in demographic parameters over time. This document contains code to solve policies using backwards iteration stochastic dynamic programming, project populations forward to simulate the policies, and generate figures.
Data Release: Germination and growth of Montezuma cypress (Taxodium mucronatum) from the Nazas River to experimental salinity treatments Data Release: Germination and growth of Montezuma cypress (Taxodium mucronatum) from the Nazas River to experimental salinity treatments
During March and April of 2018, viable seeds were collected from Cañón de Fernández State Park in Lerdo, Durango and sent to Lafayette, LA for germination. This study tested the seedling growth and germination of Taxodium mucronatum from the Nazas River watershed at different salinity concentrations representing freshwater, moderate salinity, and high salinity.
Radiocarbon age dating of biological material from cores collected off central California in 1999, 2006, and 2019 Radiocarbon age dating of biological material from cores collected off central California in 1999, 2006, and 2019
Results of radiocarbon age dating of planktic and benthic foraminifera collected from cores obtained in 1999, 2006, and 2019 offshore central California in the vicinity of Morro Bay.