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Effects of plant defenses and water availability on seasonal foraging preferences of the Nubian Ibex (Capra nubiana)
in Israel Journal of Ecology and EvolutionSearch for other papers by Elsita M. Kiekebusch in
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Search for other papers by Burt P. Kotler in
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The study of herbivore patch use has implications for herbivore habitat quality assessment, foraging behaviors, species interactions, and coexistence in patchy environments. This research focuses on the comparison of the effects of two qualitatively different plant defenses, mechanical (thorns) and chemical (tannins), on ibex foraging preferences during different seasons of the year. The occurrence of both chemical and mechanical plant defenses were experimentally manipulated in artificial resource patches, in addition to water availability. Ibex foraging preferences were quantified using giving-up densities during four separate fieldwork sessions in each of the seasons of the year at cliff sites overlooking the Zin Valley of the Negev Highlands. Both mechanical and chemical plant defenses significantly hindered ibex food intake overall. Mechanical and chemical defenses acted as substitutable defenses, meaning that their combined effects were not greater than additive. There were strong seasonal patterns of the amount of food consumed by ibex, further corroborated by comparison to rainfall levels. Seasonality also interacted with the effectiveness of plant defenses. Thorns were especially ineffective in summer, whereas tannins were most effective in spring. Decreases in seasonal food availability and increased marginal value of energy for ibex may have resulted in thorn ineffectiveness, while seasonal changes in the emergence of young foliage may have resulted in the greater springtime tannin effectiveness. Water was not found to mitigate the detrimental effects of tannins through dilution. The implications for decreased constraints on selective pressures on ibex due to the substitutability of plant defenses are discussed.
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-
Alkon PU, , Harding L, , Jdeidi T, , Masseti M, , Nader I, , de Smet K, , Cuzin F, , Saltz D. 2008. Capra nubiana [Internet]. The IUCN red list of threatened species. Version 2014.3; [updated 2008 Jun 30; cited 2015 Jan 27]. Available from: http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T3796A10084254.en
-
Barahona R, , Lascano CE, , Narvaez N, , Owen E, , Morris P, , Theodorou MK. 2003. In vitro degradability of mature and immature leaves of tropical forage legumes differing in condensed tannin and non-starch polysaccharide content and composition. J Sci Food Agric. 83:1256–1266.
-
Brown JS. 1988. Patch use as an indicator of habitat preference, predation risk, and competition. Behav Ecol Sociobiol. 22:37–47.
-
Charnov EL. 1976. Optimal foraging, the marginal value theorem. Theor Pop Biol. 9: 129–136.
-
Coley PD, , Bryant JP, , Chapin FS. 1985. Resource availability and plant antiherbivore defense. Science. 230:895–899.
-
Cooper SM, , Owen-Smith N. 1985. Condensed tannins deter feeding by browsing ruminants in a South African savanna. Oecologia. 67:142–146.
-
Cooper SM, , Owen-Smith N. 1986. Effects of plant spinescence on large mammalian herbivores. Oecologia. 68:446–455.
-
Dearing DM, , Mangione AM, , Karasov WH. 2002. Ingestion of plant secondary compounds causes diuresis in desert herbivores. Oecologia. 130:576–584.
-
Druce DJ, , Brown JS, , Kerley GI, , Kotler BP, , Mackey RL, , Slotow RO. 2009. Spatial and temporal scaling in habitat utilization by klipspringers (Oreotragus oreotragus) determined using giving-up densities. Aust Ecol. 34:577–587.
-
Du Toit JT, , Bryant JP, , Frisby K. 1990. Regrowth and palatability of Acacia shoots following pruning by African savanna browsers. Ecology. 71:149–154.
-
Furstenburg D, , van Hoven W. 1994. Condensed tannin as anti-defoliate agent against browsing by giraffe (Giraffa camelopardalis) in the Kruger National Park. Comp Biochem Physiol Part A Physiol. 107:425–431.
-
Glander KE. 1982. The impact of plant secondary compounds on primate feeding behavior. Am J Phys Anthropol. 25:1–18.
-
Gross JE, , Alkon PU, , Demment MW. 1995. Grouping patterns and spatial segregation by Nubian ibex. J Arid Environ. 30:423–439.
-
Hakham E, , Ritte U. 1993. Foraging pressure of the Nubian Ibex Capra ibex nubiana and its effect on the indigenous vegetation of the En Gedi Nature Reserve, Israel. Biol Conserv. 63:9–21.
-
Hochman V. 2004. Measuring foraging behaviour of Nubian Ibex under perceived risk of predation [dissertation]. Midreshet Ben-Gurion: Ben-Gurion University of the Negev.
-
Hochman V, , Kotler BP. 2006a. Effects of food quality, diet preference and water on patch use by Nubian ibex. Oikos. 112:547–554.
-
Hochman V, , Kotler BP. 2006b. Patch use, apprehension, and vigilance behavior of Nubian Ibex under perceived risk of predation. Behav Ecol. 18:368–374.
-
Kotler BP, , Brown JS. 1990. Rates of seed harvest by two species of gerbilline rodents. J Mammal. 71:591–596.
-
Kotler BP, , Dickman CR, , Brown JS. 1998. The effects of water on patch use by two Simpson Desert granivores (Corvus coronoides and Pseudomys hermannsburgensis). Aust J Ecol. 23:574–578.
-
Kotler BP, , Gross JE, , Mitchell WA. 1994. Applying patch use to assess aspects of foraging behavior in Nubian ibex. J Wildl Manag. 58:299–307.
-
León A, , Tumpson D. 1975. Competition between two species for two complementary or substitutable resources. J Theor Biol. 50:185–201
-
Levy N, , Bernadsky G. 1991. Creche behavior of Nubian ibex Capra ibex nubiana in the Negev desert highlands, Israel. Isr J Zool. 37:125–137.
-
MacArthur RH, , Pianka ER. 1966. On optimal use of a patchy environment. Am Nat. 100:603–609.
-
Makkar HP, , Dawra RK, , Singh B. 1991. Tannin levels in leaves of some oak species at different stages of maturity. J Sci Food Agric. 54:513–519.
-
Molokwu M, , Nilsson J, , Ottosson U, , Oslon O. 2010. Effects of season, water and predation risk on patch use by birds on the African savannah. Oecologia. 164:637–645.
-
Pennings SC, , Nadeau MT, , Paul VJ. 1993. Selectivity and growth of the generalist herbivore Dolabella auricularia feeding upon complementary resources. Ecology. 74:879–890.
-
Rapport D. 1980. Optimal foraging for complementary resources. Am Nat. 116:324–346.
-
Robbins CT, , Mole S, , Hagerman AE, , Hanley TA.1987. Role of tannins in defending plants against ruminants: reduction in dry matter digestion? Ecology. 68:1606–1615.
-
Rohner C, , Ward D. 1997. Chemical and mechanical defense against herbivory in two sympatric species of desert Acacia. J Veg Sci. 8:717–726.
-
Rubanza CD, , Shem MN, , Otsyina R, , Bakengesa SS, , Ichinohe T, , Fujihara T. 2005. Polyphenolics and tannins effect on in vitro digestibility of selected Acacia species leaves. Anim Feed Sci Tech. 119:129–142.
-
Schmidt KA. 2000. Interactions between food chemistry and predation risk in fox squirrels. Ecology. 81:2077–2085.
-
Schmidt KA, , Brown JS, , Morgan RA. 1998. Plant defenses as complementary resources: a test with squirrels. Oikos. 81:130–142.
-
Schoener TW. 1971. Theory of feeding strategies. Annu Rev Ecol Syst. 2:369–404.
-
Schulze ED, , Hall AE, , Lange OL, , Evenari M, , Kappen L, , Buschbom U. 1980. Long-term effects of drought on wild and cultivated plants in the Negev desert. Oecologia. 45:11–18
-
Shrader A, , Bell C, , Bertolli L, , Ward D. 2012. Forest or the trees: at what scale do elephants make foraging decisions? Acta Oecol. 42:3–10.
-
Shrader AM, , Kotler BP, , Brown JS, , Kerley GI. 2008. Providing water for goats in arid landscapes: effects on feeding effort with regard to time period, herd size and secondary compounds. Oikos. 117:466–472.
-
Stuart C, , Stuart T. 2000. Field guide to the larger mammals of Africa. 2nd ed. Cape Town: Stuik.
-
Tadesse SA. 2008. Determinants of habitat selection and patch use behavior in Nubian Ibex (Capra nubiana) of Israel [dissertation]. Midreshet Ben-Gurion: Ben-Gurion University of the Negev.
-
Ward D, , Spiegel M, , Saltz D. 1997. Gazelle herbivory and interpopulation differences in calcium oxalate content of leaves of a desert lily. J Chem Ecol. 23:333–346.
-
Wilson S, , Kerley GI. 2003. The effect of plant spinescence on the foraging efficiency of bushbuck and boergoats: browsers of similar body size. J Arid Environ. 55:150–158.
-
Zangvil A, , Offer Z, , Burde G, , Berkofsky L, , Gutman L, , Adar M, , Klepach D. 2012. Rain archive [Internet]. The Desert Meteorology Group, Department of Solar Energy and Environmental Physics. Midreshet Ben-Gurion: Blaustein Institute for Desert Research, Ben Gurion University of the Negev; [cited June 2012]. Available from: http://www.bgu.ac.il/BIDR/research/phys/meteorology/
| Insgesamt | Letzte 365 Tage | In den letzten 30 Tagen | |
|---|---|---|---|
| Aufrufe von Kurzbeschreibungen | 588 | 128 | 28 |
| Gesamttextansichten | 42 | 3 | 0 |
| PDF-Downloads | 62 | 7 | 0 |
Effects of plant defenses and water availability on seasonal foraging preferences of the Nubian Ibex (Capra nubiana)
in Israel Journal of Ecology and EvolutionSearch for other papers by Elsita M. Kiekebusch in
Current site
Google Scholar
PubMed
Search for other papers by Burt P. Kotler in
Current site
Google Scholar
PubMed
The study of herbivore patch use has implications for herbivore habitat quality assessment, foraging behaviors, species interactions, and coexistence in patchy environments. This research focuses on the comparison of the effects of two qualitatively different plant defenses, mechanical (thorns) and chemical (tannins), on ibex foraging preferences during different seasons of the year. The occurrence of both chemical and mechanical plant defenses were experimentally manipulated in artificial resource patches, in addition to water availability. Ibex foraging preferences were quantified using giving-up densities during four separate fieldwork sessions in each of the seasons of the year at cliff sites overlooking the Zin Valley of the Negev Highlands. Both mechanical and chemical plant defenses significantly hindered ibex food intake overall. Mechanical and chemical defenses acted as substitutable defenses, meaning that their combined effects were not greater than additive. There were strong seasonal patterns of the amount of food consumed by ibex, further corroborated by comparison to rainfall levels. Seasonality also interacted with the effectiveness of plant defenses. Thorns were especially ineffective in summer, whereas tannins were most effective in spring. Decreases in seasonal food availability and increased marginal value of energy for ibex may have resulted in thorn ineffectiveness, while seasonal changes in the emergence of young foliage may have resulted in the greater springtime tannin effectiveness. Water was not found to mitigate the detrimental effects of tannins through dilution. The implications for decreased constraints on selective pressures on ibex due to the substitutability of plant defenses are discussed.
| Insgesamt | Letzte 365 Tage | In den letzten 30 Tagen | |
|---|---|---|---|
| Aufrufe von Kurzbeschreibungen | 588 | 128 | 28 |
| Gesamttextansichten | 42 | 3 | 0 |
| PDF-Downloads | 62 | 7 | 0 |
