Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus

African Zoology

Volumn 39, Issue 2, 2004, Pages 175-181

  Balsamo, Ronald A ^a   Hofmeyr, Margaretha D ^b   Henen, Brian T ^b   Bauer, Aaron M ^a  

^a VILLANOVA UNIVERSITY   (United States)

^b UNIVERSITY OF THE WESTERN CAPE   (South Africa)

Author keywords

Biomechanics; Failure load; Herbivore; Psammobates geometricus; Tensile strength

Indexed keywords

BIOMECHANICS; FOOD PREFERENCE; LEAF; PLANT-HERBIVORE INTERACTION; REPTILE; TENSILE STRENGTH;

POACEAE; PSAMMOBATES; PSAMMOBATES GEOMETRICUS; TESTUDINIDAE;

EID: 10244246601     PISSN: 15627020     EISSN: None     Source Type: Journal    
DOI: 10.1080/15627020.2004.11657214     Document Type: Article

References (43)

1. ACOCKS, J.P.H. 1988. Veld Types of South Africa, 3rd edn. Botanical Research Institute, South Africa.
2. BAARD, E.H.W. 1990. Biological aspects and conservation status of the geometric tortoise, Psammobates geometricus (Linnaeus, 1758) (Cryptodira: Testudinidae). Ph.D. thesis, University of Stellenbosch, Stellenbosch.
3. BAARD, E.H.W. 1993. A conservation strategy for the geometric tortoise, Psammobates geometricus in the southwestern Cape Province, South Africa. Cape Nature Conservation, Cape Provincial Administration Internal Report No. 11.
4. BALSAMO, R.A., BAUER, A.M., DAVIS, S.D. & RICE, B.M. 2003. Leaf biomechanics, morphology and anatomy of the deciduous mesophyte Prunus serrulata (Rosaceae) and the evergreen sclerophyllous shrub Heteromeles arbutifolia (Rosaceae). American Journal of Botany 90: 72-77.
5. BAUER, A.M., RUSSELL, A.P & SHADWICK, R.E. 1989. Mechanical properties and morphological correlates of fragile skin in gekkonid lizards. Journal of Experimental Biology 145: 79-102.
6. BAUER, A.M., RUSSELL, A.P. & SHADWICK, R.E. 1993. Skin mechanics and morphology of two species of Pachydactylus (Reptilia: Gekkonidae). South African Journal of Zoology 28: 192-197.
7. BELS, V.L., DAVENPORT, J. DELHEUSY, V. 1997. Kinematic analysis of the feeding behavior in the box turtle Terrapene carolina (L.), (Reptilia: Emydidae). Journal of Experimental Zoology 277: 198-212.
8. BJORNDAL, K.A. 1987. Digestive efficiency in a temperate herbivorous reptile, Gopherus polyphemus. Copeia 1987: 714-720.
9. BJORNDAL, K.A. & BOLTON, A.B. 1990. Digestive processing in a herbivorous freshwater turtle: consequences of small intestine fermentation. Physiological Zoology 63: 1232-1247.
10. BJORNDAL, K.A., BOLTON, A.B. & MOORE, J.E. 1990. Digestive fermentation in herbivores: effect of food particle size. Physiological Zoology 63: 710-721.
11. BJORNDAL, K.A. & BOLTON, A.B. 1993. Digestive efficiencies in herbivorous and omnivorous freshwater turtles on plant diets: do herbivores have a nutritional advantage? Physiological Zoology 66: 384-395.
12. BOYCOTT, R.C. & BOURQUIN, O. 2000. The Southern African Tortoise Book, A Guide To Southern African Tortoises, Terrapins, and Turtles, 2nd edn. Ortwin Bourquin, Hilton, South Africa.
13. DE SOUSA, F.B., SLEPER, D.A., BELYEA, R.L. & MATCHES, A.G. 1982. Leaf tensile strength, "in vitro" digestibility, and fiber component relationships in tall fescue. Empresa Brasiliera de Pesquisa Agropecuaria 17: 1497-1504.
14. ENGELBRECHT, E. 1995. The diet, water and electrolyte balance, and thermoregulation of the geometric tortoise, Psammobates geometricus (Linnaeus, 1758; Cryptodira: Testudinidae). Ph.D. thesis, University of Stellenbosch, South Africa.
15. GOLDBLATT, P. & MANNING, J. 2000. Cape plants: a conspectus of the Cape Flora of South Africa. Strelitzia 9. National Botanical Institute of South Africa, Pretoria, and Missouri Botanical Garden, Saint Louis, Missouri.
16. GREENBERG, A.R., MEHLING, A., LEE, M. & BOCK, J.H. 1989. Tensile behavior of grass. Journal of Materials Science 24: 2549-2554.
17. HAILEY, A. 1997. Digestive efficiency and gut morphology of omnivorous and herbivorous African tortoises. Canadian Journal of Zoology 75: 787-794.
18. HENEN, B. T. 2002. Energy balance, water balance, diet and reproduction of female desert tortoises. Chelonian Conservation and Biology 4: 319-329.
19. JENNINGS, W.B. 2002. Diet selection by the desert tortoise in relation to the flowering phenology of ephemeral plants. Chelonian Conservation and Biology 4: 353-358.
20. KABIGUMILA, J. 2001. Sighting frequency and food habits of the leopard tortoise, Geochelone pardalis, in northern Tanzania. African Journal of Ecology 39: 276-285.
21. KNEEBONE, W.R. 1960. Tensile strength variations in leaves of weeping lovegrass (Eragrostis curvula (Schrad.) Nees.) and certain other grasses. Agronomy Journal 52: 539-542.
22. LEMELL, P., BEISSER, C.J. & WEISGRAM, J. 2000. Morphology and function of the feeding apparatus of Pelusios castaneus (Chelonia; Pleurodira). Journal of Morphology 244: 127-135.
23. LOEHR, V.J.T. 2002. Diet of the Namaqualand speckled padloper, Homopus signatus signatus, in early spring. African Journal of Herpetology 51: 47-55.
24. MARTENS, P.O. & BOOYSEN, P. DE V. 1968. A tensil meter for the measurement of the tensile strength of grass leaf blades. Proceedings of the Grassland Society of South Africa 3: 51-56.
25. MASON, M.C., KERLEY, G.I.H., WEATHERBY, C.A. & BRANCH, W.R. 1999. Leopard tortoises (Geochelone pardalis) in Valley Bushveld, Eastern Cape, South Africa: Specialist or generalist herbivores? Chelonian Conservation and Biology 3: 435-440.
26. McDOWELL, C. & MOLL, E. 1992. The influence of agriculture on the decline of west coast renosterveld, south-western Cape, South Africa. Journal of Environmental Management 35: 173-192.
27. MILTON, S.J. 1992. Plants eaten and dispersed by adult leopard tortoises Geochelone pardalis (Reptilia: Chelonii) in the southern Karoo. South African Journal of Zoology 27: 45-49.
28. NAGY, K.A., HENEN, B.T. & VYAS, D.B. 1998. Nutritional quality of native and introduced food plants of wild desert tortoises. Journal of Herpetology 32: 260-267.
29. NIKLAS, K.J. 1992. Plant Biomechanics: An Engineering Approach to Plant Form and Function. The University of Chicago Press, Chicago, Il.
30. OFTEDAL, O.T, HILLARD, S. & D.J. MORAFKA 2002. Selective spring foraging by juvenile desert tortoises (Gopherus agassizii) in the Mojave Desert: evidence of an adaptive nutritional strategy. Chelonian Conservation and Biology 4: 341-353.
31. O'REAGAIN, P.J. 1993. Plant structure and the acceptability of different grasses to sheep. Journal of Range Management 46: 232-236.
32. PARKER, D. 1982. The Western Cape lowland fynbos: what is there left to conserve? Veld & Flora 68: 98-101.
33. RALL, M, & FAIRALL, N. 1993. Diets and food preferences of two South African tortoises Geochelone pardalis and Psammobates oculifer. South African Journal of Wildlife Research 23: 63-70.
34. RAU, R. 1969. Über die geometrische Landschildkröte (Testudo geometrica). Salamandra 5: 36-45.
35. RAU, R., 1976. Weitere angaben über die geometrische Landschildkröte, Testudo geometrica. II. Salamandra 12 165-175.
36. SUN, D. & LIDDLE, M.J. 1993. Trampling resistance, stem flexibility and leaf strength in nine Australian grasses and herbs. Biological Conservation 65: 35-41.
37. THERON, E.P. & BOOYSEN, P. DE V. 1966. Palatability in grasses. Proceedings of the Grassland. Society of South Africa 1: 111-120.
38. VAN OUDTSHOORN, F. 1999. Guide to Grasses of Southern Africa. Briza Press, Pretoria.
39. VINCENT, J.F.V. 1982. The mechanical design of grass. Journal of Materials Science 17: 856-860.
40. VINCENT, J.F.V. 1983. The influence of water content on the stiffness and fracture properties of grass leaves. Grass and Forage Science 38: 107-114.
41. VINCENT, J.F.V. 1990. Fracture properties of plants. Advances in Botanical Research 17: 235-287.
42. VINCENT, J.F.V. 1991. Strength and fracture of grasses. Journal of Materials Science 26: 1947-1950.
43. VLOK, J.H.J. 1988. Alpha diversity of lowland fynbos herbs at various levels of infestation by alien annuals. South African Journal of Botany 54: 623-627.