1.
Auffenberg W. , Weaver W.G. Jr. ( 1969): " Gopherus berlandieriin southeastern Texas". Bull. Fla. Stat. Mus. Vol 13: 141- 203.
5.
Boycott R.C. , Bourquin O. ( 2000): The Southern African Tortoise Book. Hilton, South Africa.
7.
Branch W.R. ( 1998): Field Guide to Snakes and Other Reptiles of Southern Africa, 3rd Edition. Struik, Cape Town.
8.
Cherry S. ( 1996): "A comparison of confidence interval methods for habitat use-availability studies". J. Wildl. Manage. Vol 60: 653- 658. http://dx.doi.org/10.2307/3802084
10.
Congdon J.D. ( 1989): "Proximate and evolutionary constraints on energy relations of reptiles". Physiol. Zool. Vol 62: 356- 373.
12.
Downes S. , Shine R. ( 1998): "Heat, safety or solitude? Using habitat selection experiments to identify a lizard’s priorities". Anim. Behav. Vol 55: 1387- 1396. http://dx.doi.org/10.1006/anbe.1997.0705
13.
Duda J.J. , Krzysik A.J. , Meloche J.M. ( 2002): "Spatial organization of desert tortoises and their burrows at a landscape scale". Chelonian Conserv. Biol. Vol 4: 387- 397.
14.
Ebrahimi M. , Fenner A.L. , Bull C.M. ( 2012): "Lizard behaviour suggests a new design for artificial burrows". Wildl. Res. Vol 39: 295- 300. http://dx.doi.org/10.1071/WR11155
15.
Geffen E. , Mendelssohn H. ( 1989): "Activity patterns and thermoregulatory behavior of the Egyptian tortoise, Testudo kleinmanni, in Israel". J. Herpetol. Vol 23: 404- 409. http://dx.doi.org/10.2307/1564052
16.
Germishuizen G. , Meyer N.L. ( 2003): Plants of Southern Africa: an annotated checklist. Strelitzia 14. National Botanical Institute, Pretoria.
17.
Grant B.W. , Dunham A.E. ( 1988): "Thermally imposed time constraints on the activity of the desert lizard Sceloporus merriami ". Ecology Vol 69: 167- 176. http://dx.doi.org/10.2307/1943171
18.
Grigg G.C. , Drane C.R. , Courtice G.P. ( 1979): "Time constants of heating and cooling in the eastern water dragon, Physignathus lesueruiiand some generalizations about heating and cooling in reptiles". J. Therm. Biol. Vol 4: 95- 103. http://dx.doi.org/10.1016/0306-4565(79)90052-4
19.
Grillet P. , Cheylan M. , Thirion J.-M. , Doré F. , Bonnet X. , Dauge C. , Chollet S. , Marchand M.A. ( 2010): "Rabbit burrows or artificial refuges are a critical habitat component for the threatened lizard, Timon lepidus(Sauria, Lacertidae)". Biodivers. Conserv. Vol 19: 2039- 2051. http://dx.doi.org/10.1007/s10531-010-9824-y
21.
Hill R.A. ( 1999): "Size-dependent tortoise predation by baboons at De Hoop Nature Reserve, South Africa". S. Afr. J. Sci. Vol 95: 123.
22.
Hofmeyr M.D. , Boycott R.C. , Baard E.H.W. : "Family: Testudinidae". In: Atlas and Red List of the Reptiles of South Africa, Lesotho and Swaziland. Bates M.F. , Branch W.R. , Bauer A.M. , Burger M. , Marais J. , Alexander G.J. , de Villiers M.S. , Eds, South African Biodiversity Institute, Pretoria.
23.
Holm S. ( 1979): "A simple sequentially rejective multiple test procedure". Scand. J. Statist. Vol 6: 65- 70.
25.
Huey R.B. , Bennett A.F. ( 1990): "Physiological adjustments to fluctuating thermal environments: an ecological and evolutionary perspective". In: Stress Proteins in Biology and Medicine, p. 37- 59. Mormioto R.I. , Tissières A. , Georgopoulos C. , Eds, Cold Spring Harbor Laboratory Press, North America.
26.
Joshua Q.I. , Hofmeyr M.D. , Henen B.T. , Weitz F.M. ( 2005): "Seasonal changes in the vegetation of island and mainland habitats of angulate tortoises in the Western Cape, South Africa". S. Afr. J. Sci. Vol 101: 439- 445.
27.
Keswick T. ( 2012): Ecology and morphology of the Kalahari tent tortoise, Psammobates oculifer, in a semi-arid environment. Ph.D. thesis, University of the Western Cape, Belville, South Africa.
30.
Lagarde F. , Louzizi T. , Slimani T. , El Mouden H. , Ben Kaddour K. , Moulherat S. , Bonnet X. ( 2012): "Bushes protect tortoises from lethal overheating in arid areas of Morocco". Environ. Conserv. Vol 39: 172- 182. http://dx.doi.org/10.1017/S0376892911000634
31.
Leistner O.A. ( 1967): "The plant ecology of the southern Kalahari". Mem. Bot. Surv. S. Afr. Vol 38: 1- 140.
32.
Nagy K.A. , Medica P.A. ( 1986): "Physiological ecology of desert tortoises in southern Nevada". Herpetologica Vol 42: 73- 92.
33.
Plummer M.V. ( 2003): "Activity and thermal ecology of the box turtle, Terrapene ornata, at its southwestern range limit in Arizona". Chelonian Conserv. Biol. Vol 4: 569- 577.
35.
Press W.H. , Flannery B.P. , Teukolsky S.A. , Vetterling W.T. ( 1986): Numerical Recipes. Cambridge University Press, Cambridge.
36.
Rutherford M.C. , Mucina L. , Lotter M.C. , Bredenkamp G.J. , Smit J.H.L. , Scott-Shaw C.R. , Hoare D.B. , Goodman P.S. , Bezuidenhout H. , Scott L. , Ellis F. , Powrie L.W. , Siebert F. , Mostert T.H. , Henning B.J. , Ventner C.E. , Camp K.G.T. , Siebert S.J. , Matthews W.S. , Burrows J.E. , Dobson L. , van Rooyen N. , Schmidt E. , Winter P.J.D. , du Preez P.J. , Ward R.A. , Williamson S. , Hurter P.J.H. ( 2006): "Savanna Biome". In: The Vegetation of South Africa, Lesotho and Swaziland, p. 440- 529. Mucina L. , Rutherford M.C. , Eds, South African National Biodiversity Institute, Pretoria.
37.
Seebacher F. , Franklin C.E. ( 2005): "Physiological mechanisms of thermoregulation in reptiles: a review". J. Comp. Physiol. B Biochem. Syst. Environ. Physiol. Vol 175: 533- 541. http://dx.doi.org/10.1007/s00360-005-0007-1
39.
Spencer R. , Thompson M.B. , Hume I.D. ( 1998): "The diet and digestive energetics of an Australian short-necked turtle, Emydura macquarii ". Comp. Biochem. Physiol. Part A Mol. Integr. Physiol. Vol 121: 341- 349. http://dx.doi.org/10.1016/S1095-6433(98)10132-0
40.
Stevenson R.D. ( 1985a): "The relative importance of behavioral and physiological adjustments controlling body temperature in terrestrial ectotherms". Am. Nat. Vol 126: 362- 386. http://dx.doi.org/10.1086/284423
41.
Stevenson R.D. ( 1985b): "Body size and limits to the daily range of body temperature in terrestrial ectotherms". Am. Nat. Vol 125: 102- 117. http://dx.doi.org/10.1086/284330
43.
van Oudtshoorn F. ( 2004): Guide to Grasses of Southern Africa, 2nd Edition. Briza Publications, Pretoria.
44.
Zar J.H. ( 2001): Biostatistical Analysis, 4th Edition. Prentice Hall, Upper Saddle River, New Jersey.
45.
Zimmerman L.C. , O’Connor M.P. , Bulova S.J. , Spotila J.R. , Kemp S.J. , Salice C.J. ( 1994): "Thermal ecology of desert tortoises in the eastern Mojave Desert: seasonal patterns of operative and body temperatures, and microhabitat utilization". Herpetol. Monogr. Vol 8: 45- 49. http://dx.doi.org/10.2307/1467069