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Featured researches published by E. Cayenne Engel.


Madroño | 2009

Early Post-Fire Plant Establishment on a Mojave Desert Burn

Scott R. Abella; E. Cayenne Engel; Christina L. Lund; Jessica E. Spencer

Abstract Fire has become more extensive in recent decades in southwestern United States arid lands. Burned areas pose management challenges and opportunities, and increasing our understanding of post-fire plant colonization may assist management decision-making. We examined plant communities, soils, and soil seed banks two years after the 2005 Loop Fire, located in a creosote-blackbrush community in Red Rock Canyon National Conservation Area in southern Nevadas Mojave Desert. Based on a spring sampling of 20, 0.01-ha plots, live + dead cover of the exotic annual Bromus rubens averaged nine times lower on the burn than on a paired unburned area. Perennial species composition shifted from dominance by late-successional native shrubs (e.g., Coleogyne ramosissima) on the unburned area, to dominance by native perennial forbs (e.g., Sphaeralcea ambigua, Baileya multiradiata) on the burn. Species richness of live plants averaged 26% (100 m2 scale) and 239% (1 m2 scale) greater on the burn compared to the unburned area. Only 5% of Larrea tridentata individuals resprouted, compared to 64% of Yucca schidigera and baccata. Fire and microsite (interspace, below L. tridentata, or below Yucca) interacted to affect several 0–5 cm soil properties, with higher pH, conductivity, and total P and K on burned Yucca microsites. Bromus rubens density in 0–5 cm soil seed banks was four times lower on the burn, and its distribution among microsites reversed. Below-shrub microsites contained the most B. rubens seeds on the unburned area, but the least on the burned area. Intense fire below shrubs may have increased seed mortality, an idea supported by >3-fold decreases we found in emergence density after heating seed bank samples to 100°C. Our study occurred after a post-fire period of below-average precipitation, underscoring a need for longer term monitoring that characterizes moister years.


Journal of Fish and Wildlife Management | 2015

Enhancing Quality of Desert Tortoise Habitat: Augmenting Native Forage and Cover Plants

Scott R. Abella; Lindsay P. Chiquoine; E. Cayenne Engel; Katherine E. Kleinick; Fred S. Edwards

Abstract Vegetation in habitat of the federally listed desert tortoise Gopherus agassizii in the Mojave and western Sonoran Desert is now partly or mostly dominated by nonnative annual plants. To i...


Lake and Reservoir Management | 2014

Plant colonization and soil properties on newly exposed shoreline during drawdown of Lake Mead, Mojave Desert

E. Cayenne Engel; Scott R. Abella; Kenneth L. Chittick

Abstract Drawdown of Lake Mead from 1998 to 2011 reduced the lakes perimeter by more than 400 km while exposing more than 25,000 ha of formerly submerged land. To evaluate primary plant succession and soil properties in this new shoreline habitat, we sampled surfaces last submerged 3, 6, 9, or 13 years before sampling (including a never-submerged control) using 150, 100 m2 plots at 3 sites varying in topography and soil parent material. Consistent with previous research, abundance of the exotic saltcedar (Tamarix ramosissima) declined with increasing surface age. Conversely, cover of native species was greatest overall on older surfaces across sites. Early successional native perennial species colonized the 13-year-old surface. Unexpectedly, multivariate soil properties did not differ between never-submerged and formerly submerged surfaces. Based on the first 13 years of plant colonization along the Lake Mead shoreline and previous research on longer term Mojave Desert vegetation succession, managers can likely anticipate (1) continued development of an early colonizing native shrubland persistent for several decades, and (2) eventual colonization by species of the mature vegetation inhabiting never-submerged surfaces. Moreover, we observed colonization of formerly submerged land by a rare plant of special conservation designation, California bearpoppy (Arctomecon californica), suggesting that even after many years of submersion, rare plant habitat along the Lake Mead shoreline may be reclaimed. While Lake Meads drawdown might be viewed negatively from a perspective of maintaining full-pool water storage, it has re-exposed a vast area of new terrestrial habitat increasingly colonized by native species as invasive species abundance declines through time.


Journal of Applied Ecology | 2011

Vegetation recovery in a desert landscape after wildfires: influences of community type, time since fire and contingency effects

E. Cayenne Engel; Scott R. Abella


Biological Invasions | 2012

Responses of native and non-native Mojave Desert winter annuals to soil disturbance and water additions

Alexis A. Suazo; Jessica E. Spencer; E. Cayenne Engel; Scott R. Abella


Forest Ecology and Management | 2012

Relationships of exotic plant communities with native vegetation, environmental factors, disturbance, and landscape ecosystems of Pinus ponderosa forests, USA

Scott R. Abella; E. Cayenne Engel; Judith D. Springer; W. Wallace Covington


Soil Science Society of America Journal | 2013

Influences of Wildfires on Organic Carbon, Total Nitrogen, and Other Properties of Desert Soils

Scott R. Abella; E. Cayenne Engel


Circular | 2012

Wildlife and biological resources: Chapter 5 in A synthesis of aquatic science for management of Lakes Mead and Mohave

Sudeep Chandra; Scott R. Abella; Brandon A. Albrecht; Joseph G. Barnes; E. Cayenne Engel; Paul B. Holden; Ron B. Kegerries; Jef R. Jaeger; Erik Orsak; Michael R. Rosen; Jon Sjöberg; Wai Hing Wong


Archive | 2011

Mojave Applied Ecology Notes Fall 2011

E. Cayenne Engel; Scott R. Abella; Kathryn A. Prengaman; Jason Whited; Peter Michel


Archive | 2010

Trying to beat the brome: Understanding establishment thresholds and choosing competitive native species at Parashant National Monument

Scott R. Abella; E. Cayenne Engel

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Erik Orsak

United States Fish and Wildlife Service

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