We studied the diet and vegetation composition of Egyptian tortoise, Testudo kleinmanni, habitat in North Sinai, Egypt. Dietary data was recorded through direct observations and the vegetation composition was recorded through the use of quadrats and line transects in 66 sampling points (33 in tortoise areas and 33 in non-tortoise areas). Our results showed that vegetation of Egyptian tortoise habitat had high species richness, Simpson’s diversity index, and vegetation cover in contrast to areas without Egyptian tortoises. These tortoises ate thirty four species of plants, a majority of these being perennials, with most feeding observations occurring in spring and winter. The consumption of perennials may enable Egyptian tortoises to find and consume food in an arid environment with low, variable and unpredictable rainfall. The plants most consumed were rare in our vegetation survey, suggesting food preferences. Our study suggests that Egyptian tortoises, which rely on vegetation for food and refugia, may suffer if vegetation cover and richness decrease.
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Abdel-Razik, M., Ayyad, M., Heneidy, M. (1988): Preference of grazing mammals for forage species and their nutritive value in a Mediterranean desert ecosystem (Egypt). J. Arid. Environ. 15: 297-305.
Aguiar, M., Sala, O.E. (1999): Patch structure, dynamics and implications for the functioning of arid ecosystems. TREE 14: 273-277.
Attum, O., Eason, P., Baha el Din, S.M., Cobbs, G. (2006): Response of a desert lizard community to habitat degradation: Do ideas about habitat specialists/generalists hold? Bio. Conserv. 133: 52-62.
Attum, O., Baha El Din, M., Baha El Din, S., Habinan, S. (2007a): Egyptian tortoise conservation: a community-based, field research program developed from a study on a semi-captive population. Zoo Biol. 26: 397-406.
Attum, O., Esawy, M., Farag, W., Gad, A., Baha El Din, S., Kingsbury, B. (2007b): Returning them back to the wild: Movement patterns of repatriated Egyptian tortoises. Zool. Middle East 41: 35-40.
Attum, O., Rabea, B., Osman, S., Habinan, S., Baha El Din, S., Kingsbury, B. (2008): Conserving and studying tortoises: A local community visual-tracking or radio-tracking approach? J. Arid Environ. 72: 671-676.
Attum, O., Kramer, A., Baha El Din, S.M. (2013): Thermal utility of desert vegetation for the Egyptian tortoise and its conservation implications. J. Arid Environ. 96: 73-79.
Attum, O., Rabia, B. (2016): Movement patterns of soft-released, translocated Egyptian tortoises. J. Arid Environ. 134: 62-65.
Baha El Din, S., Attum, O., Baha El Din, M. (2003): Status of Testudo kleinmanni and T. werneri in Egypt. Chelonian Conserv. Bio. 4: 648-655.
Barrows, C.W. (2011): Sensitivity to climate change for two reptiles at the Mojave-Sonoran Desert interface. J. Arid Environ. 75: 629-635.
Batanouny, K.H. (1999): The Mediterranean Coastal Dunes in Egypt: An Endangered Landscape. Estuar. Coast. Shelf Sci. 49: 3-9.
Bayley, J.R., Highfield, A.C. (1996): Observations on ecological changes threatening a population of Testudo graeca graeca in the Souss Valley, Southern Morocco. Chelonian Conserv. Bi. 2: 36-42.
Beatley, J.C. (1974): Phenological events and their environmental triggers in Mojave Desert ecosystems. Ecology 55: 856-863.
Belgacem, A., Tarhouni, M., Louhaichi, M. (2013): Effect of protection on plant community dynamics in the Mediterranean arid zone of southern Tunisia: A case study from Bou Hedma National Park. Land Degrad. Dev. 24: 57-62.
Cunningham, P. (2009): Observations of the seasonal dietary preference of male Gazella subgutturosa marica Thomas, 1897 (Cetartiodactyla: Bovidae) along foraging trails of central Saudi Arabia. J. Threat. T. 1: 445-449.
Del Vecchio, S., Burke, R.L., Rugiero, L., Capula, M., Luiselli, L. (2011): Seasonal changes in the diet of Testudo hermani hermanni in Central Italy. Herpetologica 67: 236-249.
Drake, K.K., Bowen, L., Nussear, K.E., Esque, T.C., Berger, A.J., Custer, N.A., Waters, S.C., Johnson, J.D., Miles, A.K., Lewison, R.L. (2016): Negative impacts of invasive plants on conservation of sensitive desert wildlife. Ecosphere 7 (10): e01531. DOI:10.1002/ecs2.1531.
El-Bana, M., Nijs, I., Kockelbergh, F. (2002): Microenvironmental and vegetational heterogeneity induced by phytogenic nebkhas in an arid coastal ecosystem. Plant and Soil 247: 283-293.
El-Bana, M., Nijs, I., Khedr, A.A. (2003): The importance of phytogenic mounds (Nebkhas) for restoration of arid degraded rangelands in Northern Sinai. Restor. Ecol. 11: 317-324.
El-Bana, M., Li, Z.Q., Nijs, I. (2007): Role of host identity in effects of phytogenic mounds on plant assemblages and species richness on coastal arid dunes. J. Veg. Sci. 18: 635-644.
El Mouden, E.H., Slimani, T., Ben Kaddour, K., Lagarde, F., Ouhammou, A., et al. (2006): Testudo graeca graeca feeding ecology in an arid and overgrazed zone in Morocco. J. Arid Environ. 64: 422-435.
Fleischner, T.L. (1994): Ecological costs of livestock grazing in western North America. Conserv. Biol. 8: 629-644.
Flower, S.S. (1933): Notes on the recent reptiles and Amphibians of Egypt, with a list of the species recorded from that Kingdom. P. Zool. Soc. Lon. 735-851.
Garner, W., Steinberger, Y. (1989): A proposed mechanism for the formation of ‘fertile islands’ in the desert ecosystem. J. Arid Environ. 16: 257-262.
Geffen, E., Mendelssohn, H. (1989): Activity patterns and thermoregulatory behavior of the Egyptian tortoise Testudo kleinmanni in Israel. J. Herpetol. 23: 404-409.
Gibson, C.W.D., Hamilton, J. (1983): Feeding ecology and seasonal movements of giant tortoises on Aldabra Atoll. Oecologia 56: 84-92.
Hailey, A., Loveridge, J.P. (1997): Metabolic depression during dormancy in the African tortoise, Kinixys spekii. Can. J. Zool. 75: 1328-1335.
Hazard, L.C., Shemanski, D.R., Nagy, K.A. (2009): Nutritional quality of natural foods of juvenile desert tortoises (Gopherus agassizii): energy, nitrogen, and fiber digestibility. J. Herpetol. 43: 38-48. DOI:10.1670/07-160R1.1.
Hazard, L.C., Shemanski, D.R., Nagy, K.A. (2010): Nutritional quality of natural foods of juvenile and adult desert tortoises (Gopherus agassizii): calcium, phosphorus, and magnesium digestibility. J. Herpetol. 44: 135-147. DOI:10.1670/08-134.
IUCN (2020) The IUCN Red List of Threatened Species.
Jacobson, E.R., Gaskin, J.M., Brown, M.B., Harris, R.K., Gardiner, C.H., et al. (1991): Chronic upper respiratory tract disease of free-ranging desert tortoises (Xerobates agassizii). J. Wildl. Dis. 27: 296-316.
Jennings, W.B., Berry, K.H. (2015): Desert tortoises (Gopherus agassizii) are selective herbivores that track the flowering phenology of their preferred food plants. Plos One 10 (1): e0116716. DOI:10.1371/journal.pone.0116716.
Jennings, W.B. (2001): Comparative flowering phenology of plants in the western Mojave Desert. Madroño 48: 162-171.
Joshua, Q.I., Hofmeyr, M.D., Henen, B.T. (2010): Seasonal and site variation in angulate tortoise diet and activity. J. Herpetol. 44: 124-134.
Kefi, S., Rietkerk, M., Alados, C.L., Pueyo, Y., Papanastasis, V.P., ElAich, A., De Ruiter, P.C. (2007): Spatial vegetation patterns and imminent desertification in Mediterranean arid ecosystems. Nature 449: 213-217.
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. 39: 172-182.
Loehr, V.J.T., Hofmeyr, M.D., Henen, B.T. (2009): Small and sensitive to drought: consequences of aridification to the conservation of Homopus signatus signatus. Afr. J. Herpetol. 58: 116-125.
MacDonald, L.A., Mushinsky, H.R. (1988): Foraging ecology of the gopher tortoise, Gopherus polyphemus, in a sandhill habitat. Herpetologica 44: 345-353.
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 Conserv. Biol. 3: 435-440.
Meienberger, C., Wallis, I.R., Nagy, K.A. (1993): Food intake rate and body mass influence transit time and digestibility in the Desert Tortoise (Xerobates agassizii). Physiol. Zool. 66: 847-862.
Milchunas, D.G., Lauenroth, W.K. (1993): Quantitative effects of grazing on vegetation and soils over a global range of environments. Ecol. Monogr. 63: 327-366.
Moskovits, D.K., Bjorndal, K.A. (1990): Diets and food preferences of the tortoises Geochelone carbonaria and G. denticulata in northwestern Brazil. Herpetologica 46: 207-218.
Nagy, K.A. (1988): Seasonal patterns of water and energy balance in desert vertebrates. J Arid Environ 14: 201-210.
Nagy, K.A., Medica, P.A. (1986): Physiological ecology of desert tortoises in southern Nevada. Herpetologica 42: 73-92.
Noy-Meir, I. (1973): Desert ecosystems: environment and producers. Annu. Rev. Ecol. Syst. 4: 25-52.
Oftedal, O.T. (2002): Nutritional ecology of the desert tortoise in the Mohave and Sonoran deserts. The Sonoran Desert Tortoise: Natural History, Biology, and Conservation. Tucson: The University of Arizona Press and Arizona-Sonora Desert Museum. 194-241.
Oftedal, O.T., Hillard, S., Morafka, D.J. (2002): Selective spring foraging by juvenile desert tortoises (Gopherus agassizii) in the Mojave Desert: evidence of an adaptive nutritional strategy. Chelonian Conserv. Biol. 4: 341-352.
Peterson, C.C. (1996): Anhomeostasis: seasonal water and solute relations in two populations of the desert tortoise (Gopherus agassizii) during chronic drought. Physiol. Zool. 69: 1324-1358.
Rhodin, A.G., Stanford, C.B., Van Dijk, P.P., Eisemberg, C., Luiselli, L., Mittermeier, R.A., …, Walde, A. (2018): Global conservation status of turtles and tortoises (order Testudines). Chelonian Conserv. Biol. 17: 135-161.
Saltz, D., Ward, D. (1994): Foraging at different spatial scales: Dorcas gazelles foraging for lilies in the Negev Desert. Ecology 75: 48-58.
Sharaf El-Din, A., El-Kady, H.F. (2001): Nutritive value of the range plants in the Mediterranean desert of Egypt. Arab Gulf J. Sci. Rese. 19: 19-27.
Sinervo, B., Mendez-de-la-Cruz, F., Miles, D.B., Heulin, B., et al. (2010): Erosion of lizard diversity by climate change and altered thermal niches. Science 328: 894-899.
Verón, S.R., Paruelo, J.M., Oesterheld, M. (2006): Assessing desertification. J. Arid. Environ. 66: 751-763.
White, T.R.C. (1978): The importance of a relative shortage of food in animal ecology. Oecologia 33: 71-86.
All Time | Past 365 days | Past 30 Days | |
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We studied the diet and vegetation composition of Egyptian tortoise, Testudo kleinmanni, habitat in North Sinai, Egypt. Dietary data was recorded through direct observations and the vegetation composition was recorded through the use of quadrats and line transects in 66 sampling points (33 in tortoise areas and 33 in non-tortoise areas). Our results showed that vegetation of Egyptian tortoise habitat had high species richness, Simpson’s diversity index, and vegetation cover in contrast to areas without Egyptian tortoises. These tortoises ate thirty four species of plants, a majority of these being perennials, with most feeding observations occurring in spring and winter. The consumption of perennials may enable Egyptian tortoises to find and consume food in an arid environment with low, variable and unpredictable rainfall. The plants most consumed were rare in our vegetation survey, suggesting food preferences. Our study suggests that Egyptian tortoises, which rely on vegetation for food and refugia, may suffer if vegetation cover and richness decrease.
All Time | Past 365 days | Past 30 Days | |
---|---|---|---|
Abstract Views | 1293 | 495 | 108 |
Full Text Views | 48 | 12 | 1 |
PDF Views & Downloads | 96 | 23 | 0 |