Endocrine Factors in the Water Metabolism of the Desert Mammal, G. Gerbillus1

Burns, Thomas W.; Balekjian, Aram Y.

doi:10.1210/endo-58-2-243

Cited by 30 publications

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“…II est, aussi, plus eleve que celui de Gerbillus gerbülus qui, avec 40 ä 50 mg/100 g de poids corporel, est identique ä ceux des petits rongeurs sauvages d'Europe et notamment aux Campagnols (Delost, 1953 ;Delost et coll., 1955) et se rapproche de la majority des autres especes de rongeurs desertiques etudies. Le poids surrenalien relatif est de 47 chez Gerbillus gerbülus male provenant du desert ogyptien (Burns, 1956), de 50,7 chez la Souris du dosert d'Amerique du Nord Perognathus baileyi (Treiman et coll., 1969), de l'ordre de 58 chez le male et 62 chez la femelle de la gerbille de Mongolie, Meriones unguiculatus (Gordon et coll., 1961), de 30,6 chez la femelle du Rat du desert de i'Inde, Rattus cutchicus (Rana et coll., 1975) mais sculement de 17,3 chez le Rat Kangourou d'Ame*rique du Nord Dipodomys merriami (Yousef et coll., 1970).…”

Section: Conclusion Et Discussionunclassified

Variations saisonnières comparées du poids de la surrénale chez deux espèces de rongeurs désertiques (Psammomys obesus et Gerbillus gerbillus)

Amirat¹,

Khammar²,

Brudieux³

1980

Mammalia

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Variations saisonnieres comparees du poids de la surrenale chez deux especes de rongeurs desertiques (Psammomys obesus et Gerb lus gerb lus)par Zama AMIRAT, Farida KHAMMAR et Roger BRUDIEUX Sous le climat de Βέηί-Abbes (Algarie), la surrenale de Psammomys obesus male est toujours beaucoup plus lourde que celle de la femelle et eile subit des variations saisonnieres plus importantes. Cependant, dans les deux sexes, son plus grand developpement se situe au printemps et son poids le plus faible en ete*; mais alors que chez la femelle le poids surr^nalien reste peu pres constant le reste de l'ann^e, on constate chez le male une nette reprise du poids en automne, qui s'accentue partir de fevrier.Chez Gerbillus gerbillus, il n'existe pas de dimorphisme sexuel du poids de la surrenale. On constate un plus grand developpement de cette glande au printemps et une regression en 6te\ Cependant, contrairement au Psammomys, ces variations sont moins accentuoes chez le male que chez la femelle ; Γ augmentation du poids surrenalien, mise en evidence uniquement chez le male de Psammomys obesus, se retrouve seulement chez la femelle de Gerbillus gerbillus.Pour ces deux especes, mais surtout chez le Psammomys, les variations annuelles du poids surrenalien sont paralleles a celles de I'appareil genital male. La gestation et la lactation ne provoquent pas de modifications notables du poids de la surrenale.Les Mammiferes des regions dosertiques subissent, au cours de I'annoe, I'influence de variations climatiques extremement importantes. I/activite* surrenalienne, pourtant essentielle dans ^adaptation de Torganisme aux situations stressantes, a fait Tobjet de travaux tres peu nombreux et fragmentaires chez les rongeurs de*sertiques (Sivashankar et coll., 1968 ; Haggag et coll., 1974;Benimetskij, 1975 ; Naumov et coll., 1975 ; Rana et coll., 1975).Dans le cadre des recherches du Laboratoire sur T^cophysiologie endocrinienne des functions sexuelles et corticosurre*naliennes des Mammiferes des zones arides, nous rapportons, ici, la comparaison des variations saisonnieres ponde*rales de la surrenale chez deux especes de rongeurs capturos dans la meme region, mais dont le rythme d'activite* et le regime alimentaire sont diffe*rents : le Rat des sables (Psammomys obesus), diurne, se riourrit exclusivement de Chonopodiac^es ; la petite Gerbille (Gerbillus gerbillus) 9 nocturne, a un rogime plus varie* comprenant surtout des feuilles et des graines de Tamaris et des dattes. MATfiRIEL ET MfiTHODESLes conditions de capture et de sacrifice et la constitution des lots d'animaux ont ete proc^demment dtoites en detail (Amirat et coll., 1977); nous les re*sumerons ici. Mammalia, t. 44, n° 3, 1980. Brought to you by |

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Section: Conclusion Et Discussionunclassified

Variations saisonnières comparées du poids de la surrénale chez deux espèces de rongeurs désertiques (Psammomys obesus et Gerbillus gerbillus)

Amirat¹,

Khammar²,

Brudieux³

1980

Mammalia

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“…Detailed data on the renal concentrating capacity of M. unguicuiatus has not been documented, but such information is available for the related genus, Gerbil/us. Burns (1956) found than when fed salted barley, gerbils from North Africa produced urine that was 1300 mEq Na per liter (equivalent to about 7.6% NaCl). The present results indicate that although the renal system of M .…”

Section: Discussionmentioning

confidence: 96%

Saline intake in gerbils (Meriones unguiculatus)

Wong

1977

Psychobiology

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Experiment 1 assessed the NaCI preference-aversion function of gerbils on the two-bottle test. The results indicated that gerbils do not show the strong preference for 0.9% NaCI that rats do. There was also no significant difference between the gerbils' intake of 0.9% and 2.0% NaCl. However, there was a significant decrease in the gerbils' saline consumption when the solution was 4.0% by weight. Experiments 2 and 3 demonstrated that the interposition of a single bottle of hypertonic saline prior to the two-bottle test with isotonic saline and water can decrease the gerbils' preference for isotonic saline relative to a control group. This effect depended upon the tonicity of the interposed solution. Although rats show a marked reduction in saline preference following exposure to a single bottle of 2.0% NaCI for 24 h, gerbils do not react similarly. However, when the interposed solution is 4.0% NaCl, gerbils show a subsequent reduction in isotonic saline intake. These results suggest parametric differences between the variables affecting fluid regulation of mesophytic and xerophytic adapted animals which reflect species differences in renal handling of osmotic loads . '

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“…That confinement did not cause great anxiety in P. truei is indicated by the fact that exceptionally dilute urine samples, a consequence of Ecology,Vol. 55,No.6 disturbance-induced diuresis (Burns 1956, MacMillen 1964a, were uncommon and less frequent among field samples than among any of the laboratory groups, in which sampling was essentially instantaneous.…”

Section: Discussionmentioning

confidence: 98%

Water Stress of Free‐Living Peromyscus Truei

Bradford¹

1974

Ecology

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The water relations of a Peromyscus truei population from a xeric environment, chamise chaparral, were studied in the field during two periods, midsummer and late summer, and in the laboratory. Animals were maintained in the laboratory on three water regimens that represented a gradient of water stress, but food was available ad libitum. When subjected to increasing degrees of water stress, urine osmotic concentrations increased, feces became drier, and body—water turnover rates, determined with tritiated water, decreased. When subjected to the severest water stress, diurnal torpor occurred and apparently caused a decline in urine concentration and an increase in fecal water content during the daytime. Urine osmotic concentrations and fecal water contents of midsummer mice in the field were similar to values for mice subjected to severe water stress in the laboratory. In late summer, however, the values indicated low water stress. The lower water exchange during midsummer, as determined by tritiated—water turnover, indicated that the greater water stress at this time was at least partly due to a reduced availability of water compared to late summer. During both periods food was the only apparent source of water. Mice in midsummer were feeding primarily on insects, foliage, and fungi, but during late summer, when acorns became available, they switched to this as the predominant dietary component. Acorn utilization was accompanied by onset of female reproductive activity and body weight increases for both sexes. It is suggested that water stress was alleviated by the acorn diet and was responsible for the lack of reproductive activity and depressed body weights for several months during summer.

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Endocrine Factors in the Water Metabolism of the Desert Mammal, G. Gerbillus1

Cited by 30 publications

References 0 publications

Variations saisonnières comparées du poids de la surrénale chez deux espèces de rongeurs désertiques (Psammomys obesus et Gerbillus gerbillus)

Variations saisonnières comparées du poids de la surrénale chez deux espèces de rongeurs désertiques (Psammomys obesus et Gerbillus gerbillus)

Saline intake in gerbils (Meriones unguiculatus)

Water Stress of Free‐Living Peromyscus Truei

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