Effects of Rainfall and Temperature on the Distribution and Behavior of Larrea Tridentata (Creosote-Bush) in the Mojave Desert of Nevada

Ecology ◽  
1974 ◽  
Vol 55 (2) ◽  
pp. 245-261 ◽  
Author(s):  
Janice C. Beatley
Keyword(s):  
Mojave Desert ◽  
Larrea Tridentata ◽  
Creosote Bush ◽  
And Behavior

A new species of Brethesiella (Hymenoptera: Encyrtidae) from California, USA, a parasitoid of Steatococcus tabernicolus (Hemiptera: Margarodidae)

Zootaxa ◽  
2006 ◽  
Vol 1167 (1) ◽  
pp. 1 ◽  
Author(s):  
VLADIMIR A. TRJAPITZIN ◽  
SERGUEI V. TRIAPITSYN
Keyword(s):  
New Species ◽  
Mojave Desert ◽  
New World ◽  
Larrea Tridentata ◽  
Creosote Bush ◽  
Type Series ◽  
A New Species

A new species of the encyrtid wasp genus Brethesiella Porter, 1920 is described from the Mojave Desert in California, USA. The type series of B. mojave sp. n. was reared from the margarodid scale Steatococcus tabernicolus Ferris on creosote bush, Larrea tridentata. The genus Aztecencyrtus Timberlake, 1926 is synonymized under Brethesiella and its two described species are transferred to the latter as B. flava (Timberlake, 1926) comb. n. and B. iceryae (Howard, 1892) comb. n. A brief review of the encyrtid parasitoids of Margarodidae, a diagnosis of Brethesiella, and an annotated key to its six described species with known females in the New World are provided.

Cervidellus sonorensis n. sp. (Nematoda: Cephalobidae) from the desert of Anza-Borrego, CA, USA

Nematology ◽  
2011 ◽  
Vol 13 (5) ◽  
pp. 607-617 ◽  
Author(s):  
Erik J. Ragsdale ◽  
Manuel Mundo -Ocampo ◽  
Daniel J. Bumbarger ◽  
James G. Baldwin
Keyword(s):  
Larrea Tridentata ◽  
Creosote Bush ◽  
Distinctive Features ◽  
Parthenogenetic Species ◽  
Male Individual ◽  
Phylogenetic Hypotheses

Abstract Cervidellus sonorensis n. sp. is described from sand near the roots of creosote bush (Larrea tridentata) from Anza-Borrego Desert State Park, CA, USA. It is distinguished from others in the genus by the combination of a greatly distended, guitar-shaped corpus and the morphology of the lips and labial probolae. Distinctive features include a large pharyngeal metacorpus with a double swelling, a knob-like ledge at the base of each labial probola and lips with five filamentous tines, the most apical of which are those closest to the primary axil. One male individual was discovered in this parthenogenetic species. Characters used to diagnose C. sonorensis n. sp. are not definitive with respect to other genera and are probably plesiomorphic or convergent in light of DNA-based phylogenetic hypotheses. The position of C. sonorensis n. sp. and morphologically close congeners in relation to species of Nothacrobeles and Paracrobeles is discussed.

scholarly journals Ambient temperature influences tolerance to plant secondary compounds in a mammalian herbivore

2016 ◽  
Vol 283 (1822) ◽  
pp. 20152387 ◽  
Author(s):  
P. Kurnath ◽  
N. D. Merz ◽  
M. D. Dearing
Keyword(s):  
Maximum Dose ◽  
Secondary Compounds ◽  
Larrea Tridentata ◽  
Cool Temperature ◽  
Creosote Bush ◽  
Temperature Dependent ◽  
Plant Secondary Compounds ◽  
Ambient Temperatures ◽  
Neotoma Lepida ◽  
Mammalian Herbivore

Growing evidence suggests that plant secondary compounds (PSCs) ingested by mammals become more toxic at elevated ambient temperatures, a phenomenon known as temperature-dependent toxicity. We investigated temperature-dependent toxicity in the desert woodrat ( Neotoma lepida ), a herbivorous rodent that naturally encounters PSCs in creosote bush ( Larrea tridentata ), which is a major component of its diet. First, we determined the maximum dose of creosote resin ingested by woodrats at warm (28–29°C) or cool (21–22°C) temperatures. Second, we controlled the daily dose of creosote resin ingested at warm, cool and room (25°C) temperatures, and measured persistence in feeding trials. At the warm temperature, woodrats ingested significantly less creosote resin; their maximum dose was two-thirds that of animals at the cool temperature. Moreover, woodrats at warm and room temperatures could not persist on the same dose of creosote resin as woodrats at the cool temperature. Our findings demonstrate that warmer temperatures reduce PSC intake and tolerance in herbivorous rodents, highlighting the potentially adverse consequences of temperature-dependent toxicity. These results will advance the field of herbivore ecology and may hone predictions of mammalian responses to climate change.

Resprout characteristics of creosote bush (Larrea tridentata) when subjected to repeated vehicle damage

2004 ◽  
Vol 57 (4) ◽  
pp. 411-429 ◽  
Author(s):  
Arthur C Gibson ◽  
M Rasoul Sharifi ◽  
Philip W Rundel
Keyword(s):  
Larrea Tridentata ◽  
Creosote Bush
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