Ecological Research

, Volume 22, Issue 4, pp 535–541 | Cite as

Rodent acorn selection in a Mediterranean oak landscape

Original Article


Quercus suber, Quercus ilex and Quercus coccifera (Cork, Holm and Kermes oaks, respectively) are common evergreen oak species that coexist in the landscapes of the western part of the Mediterranean basin. Rodents are the main acorn predators and thus one of the main factors for understanding recruitment patterns in oaks. In this paper we analyse to what extent mice prefer acorns from one oak species over another in three oak species studied using acorn removal experiments and video tape recordings. Twenty labelled acorns from each of the three Quercus species (60 acorns) were placed in 40 cm×40 cm quadrats on each plot. Because selection might vary as a result of the vegetation context, we performed the trials in the five main vegetation types within the study area (four replicates in each vegetation type) in order to control for habitat influences on rodent acorn preferences (a total of 20 plots). The removal of 1,200 acorns occurred within 68 days. Mice removed 98.7% of the acorns. Q. ilex acorns were preferred over Q. suber and Q. coccifera in all vegetation types except in pine forest, where no acorn preferences were detected. Acorn removal rates differed with vegetation type, correlating positively with shrub cover. The distance at which acorns were displaced by rodents (mean =4.6 m±5.1 SD) did not differ between acorn species, but varied among vegetation types. Bigger acorns of Q. coccifera were selected only after Q. ilex and Q. suber acorns were depleted, while no size selection was detected for the latter two species. Thus, we conclude that rodents show preference for some oak acorns and that landscape context contributes significantly to rodent activities and decisions.


Apodemus sylvaticus Quercus coccifera Quercus ilex Quercus suber Removal rates Retrieval distances Size selection 


  1. Afzalrafii Z, Dodd RS, Pelleau Y (1992) Mediterranean evergreen oak diversity—morphological and chemical variation of acorns. Can J Bot 70:1459–1466Google Scholar
  2. Alcantara JM (2000) Factors shaping the seedfall pattern of a bird-dispersed plant. Ecology 81:1937–1950Google Scholar
  3. Bonet A, Pausas JG (2006) Old field dynamics on the dry side of the Mediterranean basin: patterns and processes in semiarid SE Spain. In: Cramer VA, Hobbs RJ (eds) Old fields: dynamics and restoration of abandoned farmland. Island Press (in press)Google Scholar
  4. Borchert M (1989) Interaction of factors affecting seedling recruitment of blue oak (Quercus douglasii) in California. Ecology 70:389–404CrossRefGoogle Scholar
  5. Briggs JM, Smith KG (1989) Influence of habitat on acorn selection by Peromyscus leucopus. J Mammal 70:35–43CrossRefGoogle Scholar
  6. Cañellas I, San Miguel A (2003) La coscoja (Quercus coccifera L.): ecología, características y usos. Monografías. INIA, MadridGoogle Scholar
  7. Cantos E, Espin JC, Lopez-Bote C, De la Hoz L, Ordonez JA, Tomas-Barberan FA (2003) Phenolic compounds and fatty acids from acorns (Quercus spp.), the main dietary constituent of free-ranged Iberian pigs. J Agric Food Chem 51:6248–6255PubMedCrossRefGoogle Scholar
  8. Díaz M, Torre I, Peris A, Tena L (2005) Foraging behaviour of wood mice as related to presence and activity of genets. J Mammal 86:165–172CrossRefGoogle Scholar
  9. Falkenberg JC, Clarke JA (1998) Microhabitat use of deer mice: effects of interspecific interaction risk. J Mammal 79:558–565CrossRefGoogle Scholar
  10. Ferreira-Dias S, Valente DG, Abreu JMF (2003) Pattern recognition of acorns from different Quercus species based on oil content and fatty acid profile. Grasas y Aceites 54:384–391Google Scholar
  11. Gomez JM (2004a) Bigger is not always better: conflicting selective pressures on seed size in Quercus ilex. Evolution 58:71–80Google Scholar
  12. Gomez JM (2004b) Importance of microhabitat and acorn burial on Quercus ilex early recruitment: non-additive effects on multiple demographic processes. Plant Ecol 172:287–297CrossRefGoogle Scholar
  13. Gomez JM, Garcia D, Zamora R (2003) Impact of vertebrate acorn- and seedling-predators on a Mediterranean Quercus pyrenaica forest. For Ecol Manage 180:125–134CrossRefGoogle Scholar
  14. Hoshizaki K, Hulme PE (2002) Mast seeding and predator-mediated indirect interactions in a forest community: evidence from post-dispersal fate of rodent-generated caches. In: Seed dispersal and frugivory. CAB International, UK, pp 227–239Google Scholar
  15. Hulme PE (1994) Post dispersal seed predation in grassland: its magnitude and sources of variation. J Ecol 82:645–652CrossRefGoogle Scholar
  16. Hulme PE (1997) Post-dispersal seed predation and the establishment of vertebrate dispersed plants in Mediterranean scrublands. Oecologia 111:91–98CrossRefGoogle Scholar
  17. Ivan JS, Swihart RK (2000) Selection of mast by granivorous rodents of the central hardwood forest region. J Mammal 81:549–562CrossRefGoogle Scholar
  18. Janzen DH (1971) Seed predation by animals. Annu Rev Ecol Syst 2:465–492CrossRefGoogle Scholar
  19. Jensen TS (1985) Seed–seed predator interactions of European beech (Fagus silvatica) and forest rodents, Clethrionomys glareolus and Apodemus flavicollis. Oikos 44:149–156CrossRefGoogle Scholar
  20. Kollmann J (1995) Regeneration window for fleshy-fruited plants during scrub development on abandoned grassland. Ecoscience 2:213–222Google Scholar
  21. Liebhold A, Sork V, Peltonen M, Koenig W, Bjornstad ON, Westfall R, Elkinton J, Knops JMH (2004) Within-population spatial synchrony in mast seeding of North American oaks. Oikos 104:156–164CrossRefGoogle Scholar
  22. Manson RH, Stiles EW (1998) Links between microhabitat preferences and seed predation by small mammals in old fields. Oikos 82:37–50CrossRefGoogle Scholar
  23. McShea WJ (2000) The influence of acorn crops on annual variation in rodent and bird populations. Ecology 81:228–238CrossRefGoogle Scholar
  24. Mohler CL (1990) Co-occurrence of oak subgenera: implications for niche differentiation. Bull Torrey Bot Club 117:247–255CrossRefGoogle Scholar
  25. Muenchow G (1986) Ecological use of time failure analysis. Ecology 67:246–250CrossRefGoogle Scholar
  26. Nieto R, Rivera M, Garcia MA, Aguilera JF (2002) Amino acid availability and energy value of acorn in the Iberian pig. Livest Prod Sci 77:227–239CrossRefGoogle Scholar
  27. Ostfeld RS, Jones CG, Wolff JO (1996) Of mice and mast. Bioscience 46:323–330CrossRefGoogle Scholar
  28. Ostfeld RS, Manson RH, Canham CD (1997) Effects of rodents on survival of tree seeds and seedlings invading old fields. Ecology 78:1531–1542Google Scholar
  29. Pausas JG (2004) Changes in fire and climate in the eastern Iberian Peninsula (Mediterranean basin). Clim Change 63:337–350CrossRefGoogle Scholar
  30. Pausas JG, Blade C, Valdecantos A, Seva JP, Fuentes D, Alloza JA, Vilagrosa A, Bautista S, Cortina J, Vallejo R (2004) Pines and oaks in the restoration of Mediterranean landscapes of Spain: new perspectives for an old practice—a review. Plant Ecol 171:209–220CrossRefGoogle Scholar
  31. Pons J, Pausas JG (2006) Oak regeneration in heterogeneous landscapes: the case of fragmented Quercus suber forests in the eastern Iberian Peninsula. For Ecol Manage 231:196–204CrossRefGoogle Scholar
  32. Pulido FJ, Díaz M (2005) Regeneration of a Mediterranean oak: a whole-cycle approach. Ecoscience 12:92–102CrossRefGoogle Scholar
  33. Pyke DA (1986) Statistical analysis of survival and removal rates experiments. Ecology 67:240–245CrossRefGoogle Scholar
  34. Scarlett TL, Smith G (1991) Acorn preference of urban Blue Jays (Cyanocitta cristata) during fall and spring in north-eastern Arkansas. Condor 93:438–442CrossRefGoogle Scholar
  35. Shaw MW (1968) Factors affecting the natural regeneration of Sessile oak (Q. petraea) in North Wales: acorn losses and germination under field conditions. J Ecol 56:647–659CrossRefGoogle Scholar
  36. Shimada T (2001a) Hoarding behaviors of two wood mouse species: different preference for acorns of two Fagaceae species. Ecol Res 16:127–133CrossRefGoogle Scholar
  37. Shimada T (2001b) Nutrient compositions of acorns and horse chestnuts in relation to seed-hoarding. Ecol Res 16:803–808CrossRefGoogle Scholar
  38. Sone K, Kohno A (1996) Application of radiotelemetry to the survey of acorn dispersal by Apodemus mice. Ecol Res 11:187–192CrossRefGoogle Scholar
  39. Stapanian MA, Smith CC (1978) A model for seed scatterhoarding: coevolution of fox squirrels and black walnuts. Ecology 59:884–896CrossRefGoogle Scholar
  40. Talebbendiab SA, Benmahdi M, Mashev NP, Vassilev GN (1990) Contribution to the investigation of the chemical composition of the acorn of various Quercus species in Algeria—investigating the acorn of Quercus ilex. Dokl Bolg Akad Nauk 43:83–86Google Scholar
  41. Talebbendiab SA, Benmahdi M, Mashev N, Vassilev GN (1991) A tribute to the study of the chemical composition of the acorn of different species of Quercus spread in Algeria. Dokl Bolg Akad Nauk 44:85–88Google Scholar
  42. Torre I, Díaz M (2004) Small mammal abundance in Mediterranean post-fire habitats: a role for predators? Acta Oecol 25:137–142CrossRefGoogle Scholar
  43. Vander Wall SB (2002) Masting in animal-dispersed pines facilitates seed dispersal. Ecology 83:3508–3516Google Scholar
  44. Willson MF, Whelan CJ (1990) Variation in postdispersal survival of vertebrate dispersed seed: effects of density, habitat, location, season and species. Oikos 57:191–198CrossRefGoogle Scholar
  45. Xiao ZS, Zhang ZB, Wang YS (2004) Dispersal and germination of big and small nuts of Quercus serrata in a subtropical broad-leaved evergreen forest. For Ecol Manage 195:141–150CrossRefGoogle Scholar

Copyright information

© The Ecological Society of Japan 2006

Authors and Affiliations

  1. 1.CEAM Fundación Centro de Estudios Ambientales del MediterráneoValenciaSpain
  2. 2.Departament d’EcologiaUniversitat d’AlacantAlacantSpain

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