Results 11 to 20 of about 14,812 (201)

A Multivariate Study of Morphological Characters for Echinocactus horizonthalonius and E. texensis (Cactaceae) and Description of a New Subspecies, E. horizonthalonius subsp. australis

open access: yesDiversity, 2022
A study was conducted to ascertain the taxonomic validity of the endangered taxon Echinocactus horizonthalonius var. nicholii and whether there may be other groups of populations worthy of subspecies status within the range of the species.
Marc A. Baker
doaj   +1 more source

Quantifying development to inform management of Mojave and Sonoran desert tortoise habitat in the American southwest

open access: yesEndangered Species Research, 2020
Two tortoise species native to the American southwest have experienced significant habitat loss from development and are vulnerable to ongoing threats associated with continued development.
Carter, SK   +7 more
doaj   +1 more source

Public Benefits of Undeveloped Lands on Urban Outskirts: Non-Market Valuation Studies and their Role in Land Use Plans [PDF]

open access: yes, 2007
Over the past three decades, the economics profession has developed methods for estimating the public benefits of green spaces, providing an opportunity to incorporate such information into land-use planning.
--2004b   +40 more
core   +1 more source

First record of Band-tailed Pigeon, Patagioenas fasciata (Columbiformes: Columbidae) in the Sonoran Desert of Baja California [PDF]

open access: yesCheck List, 2016
We report the presence of the Band-tailed Pigeon, which was not previously recorded in the Sonoran Desert in Baja California. The site was 140 km south of the nearest forest.
Jonathan Escobar-Flores   +2 more
doaj   +3 more sources

Long-term dust climatology in the western United States reconstructed from routine aerosol ground monitoring [PDF]

open access: yesAtmospheric Chemistry and Physics, 2012
This study introduces an observation-based dust identification approach and applies it to reconstruct long-term dust climatology in the western United States.
D. Q. Tong, M. Dan, T. Wang, P. Lee
doaj   +1 more source

Browsers or Grazers? New Insights into Feral Burro Diet Using a Non-Invasive Sampling and Plant DNA Metabarcoding Approach

open access: yesAnimals, 2023
Ungulates play a large role in shaping ecosystems and communities by influencing plant composition, structure, and productivity. We investigated the summer diets of feral burros in two ecosystems in which they are found in the United States: a ...
Saeideh Esmaeili   +2 more
doaj   +1 more source

Terrestrial exposure of a fresh Martian meteorite causes rapid changes in hydrogen isotopes and water concentrations [PDF]

open access: yes, 2018
Determining the hydrogen isotopic compositions and H2O contents of meteorites and their components is important for addressing key cosmochemical questions about the abundance and source(s) of water in planetary bodies.
A Al-Kathiri   +30 more
core   +1 more source

Phylogeography of the Cactophilic Drosophila and Other Arthropods Associated with Cactus Necroses in the Sonoran Desert

open access: yesInsects, 2011
Studies on the population genetics, phylogenetic relationships, systematics and evolution of arthropods that inhabit necrotic tissue of cacti in the Sonoran Desert of North America are reviewed. These studies have focused upon several species of insects (
Therese A. Markow, Edward Pfeiler
doaj   +1 more source

The floral hosts and distribution of a supposed creosote bush specialist, Colletes stepheni Timberlake (Hymenoptera: Colletidae) [PDF]

open access: yes, 2015
Colletes stepheni Timberlake, previously thought to be a narrow oligolege of Larrea (creosote bush) of limited distribution in the Sonoran Desert, is found to be a much more widely distributed psammophile of the Sonoran, Mojave and Great Basin Deserts ...
Griswold, Terry L, Nelson, Rebekah A.
core   +2 more sources

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