Projection of the cochlea to cochlear nuclei in merriam's kangaroo rat

1971 ◽  
Vol 143 (3) ◽  
pp. 323-339 ◽  
Author(s):  
Douglas B. Webster
Keyword(s):  
Cochlear Nuclei ◽  
Kangaroo Rat ◽  
Merriam's Kangaroo Rat

Prevalence of cutaneous evaporation in Merriam's kangaroo rat and its adaptive variation at the subspecific level

2000 ◽  
Vol 203 (4) ◽  
pp. 773-781 ◽  
Author(s):  
R.L. Tracy ◽  
G.E. Walsberg
Keyword(s):  
Water Loss ◽  
Evaporative Water Loss ◽  
Evaporative Water ◽  
Kangaroo Rats ◽  
Dipodomys Merriami ◽  
Kangaroo Rat ◽  
Mesic Site ◽  
Merriam's Kangaroo Rat ◽  
Cutaneous Evaporation ◽  
Subspecific Level

Previous estimates suggested that ventilatory evaporation constitutes the major source of water loss in kangaroo rats (Dipodomys spp.). We quantified rates of water loss in Merriam's kangaroo rat (Dipodomys merriami) and demonstrate the degree to which acclimation to a particular thermal and hydric environment plays a role in the intraspecific variation in water loss evident in this species. We draw the following conclusions: (1) that water loss varies intraspecifically in Merriam's kangaroo rat, in association with habitats of contrasting aridity and temperature; (2) that animals from more xeric locations have lower water loss rates than those from more mesic sites; (3) that most water loss is cutaneous, with ventilatory evaporative water loss contributing, at most, only 44% to total evaporative water loss; and (4) that intraspecific differences in rates of water loss are not acclimatory, but fixed. After acclimating under the same conditions, xeric-site animals still show a 33% lower rate of evaporative water loss than mesic-site animals.

An Unusual Distributional Record of Merriam's Kangaroo Rat, Dipodomys merriami (Mammalia: Rodentia: Heteromyidae), in Durango, Mexico

2017 ◽  
Vol 62 (3) ◽  
pp. 242-244
Author(s):  
Félix J. Flores-Zamarripa ◽  
Cristina Gómez-Valenzuela ◽  
Jesús A. Fernández
Keyword(s):  
Dipodomys Merriami ◽  
Kangaroo Rat ◽  
Merriam's Kangaroo Rat

Response Characteristics of Cochlear Nucleus Neurons to Vowel Sounds

1977 ◽  
Vol 86 (1) ◽  
pp. 37-48 ◽  
Author(s):  
Allen L. Rupert ◽  
Donald M. Caspary ◽  
George Moushegian
Keyword(s):  
Cochlear Nucleus ◽  
Discharge Rate ◽  
Neuronal Responses ◽  
Response Characteristics ◽  
Cochlear Nuclei ◽  
Kangaroo Rat ◽  
Complete Basis ◽  
Pure Tones ◽  
Neural Discharge ◽  
Tonal Stimuli

Most studies in auditory neurophysiology have utilized tonal stimuli to determine the coding properties of neurons in the cochlear nuclei. In this investigation of the kangaroo rat, cochlear nuclei, neuronal responses to vowel sounds, as well as tones, were studied. The vowel sounds, each about 40 msec in duration were: [a], [i], [I], [ε], [o], [u], [Formula: see text] [æ], and [ṛ]. Five were linked together to form a 200 msec stimulus and various combinations of five vowel sounds provided us with 18 different stimuli. The results show that neurons in the cochlear nuclei are remarkably sensitive and selective to vowel sounds. Furthermore, the responses of these neurons to pure tones do not provide a complete basis to predict the types of responses to the vowel sounds. More significant is the finding that the neural discharge rate and pattern of discharge to a particular vowel may depend on where the vowel appears in the stimulus and what other vowel precedes it. This vowel positional effect is not the same for every neuron. We have called this phenomenon a neural “set.”

Vocalization in Merriam's Kangaroo Rat

1974 ◽  
Vol 55 (2) ◽  
pp. 465-466 ◽  
Author(s):  
D. H. Owings ◽  
J. Irvine
Keyword(s):  
Kangaroo Rat ◽  
Merriam's Kangaroo Rat

The effect of climate change on Merriam's kangaroo rat, Dipodomys merriami

2001 ◽  
Vol 49 (3) ◽  
pp. 581-591 ◽  
Author(s):  
Terri L. Koontz ◽  
Ursula L. Shepherd ◽  
Diane Marshall
Keyword(s):  
Climate Change ◽  
Dipodomys Merriami ◽  
Kangaroo Rat ◽  
Merriam's Kangaroo Rat

Unusual Depigmentation after Molt in Merriam's Kangaroo Rat

1965 ◽  
Vol 46 (3) ◽  
pp. 515-516
Author(s):  
R. A. Mauer ◽  
W. G. Bradley
Keyword(s):  
Kangaroo Rat ◽  
Merriam's Kangaroo Rat
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