Vegetation structure and prey abundance requirements of the Iberian lynx: implications for the design of reserves and corridors

Summary 1. Habitat alteration and fragmentation are two of the greatest threats to biodiversity. The conservation of most species in highly encroached areas requires reserves that are connected by suitable habitat corridors to increase the effectiveness of the area under protection. However, the quality required for such corridors is still debated. This study investigated the habitat characteristics (vegetation structure and prey abundance) of sites used by resident and dispersing Iberian lynx in south-western Spain. 2. Vegetation structure and an index of rabbit abundance (the staple prey of lynx) were measured at sites used by radio-collared lynx in 1996 and 1997. Data from 128 plots used by resident lynx and 310 plots used by dispersing individuals were compared with data from 162 randomly located plots in sites considered to be unused by lynx. 3. Resident sites had a lower percentage of tree cover, shorter tree height, higher percentage of tall shrub cover, higher percentage of overall understorey and higher number of rabbit pellets than both dispersal and unused sites. The height of the short shrub layer was taller and the rabbit abundance index was higher in dispersing sites than in unused sites. 4. Gender did not affect habitat selection by lynx. During dispersal, lynx frequently (50% of cases) used vegetation patches narrower than 300 m. In these cases, sites used by lynx had higher understorey cover and taller shrub height than adjacent unused sites. The percentage of short shrub cover used by lynx increased with the length of time taken to disperse; this was the only variable that changed over time. 5. Range size of resident individuals declined significantly with the index of rabbit abundance but increased with the percentage of short shrub cover. Both variables were good predictors of range size. 6. The study shows that corridors connecting reserves do not have to be prime habitats; they can even support moderate habitat degradation due to human activity. This result has implications both for the conservation of existing corridors, and for the restoration of the many corridors between reserves that have been lost.

[1]  F. Palomares,et al.  Co-existence between Iberian lynx and Egyptian mongooses: estimating interaction strength by structural equation modelling and testing by an observational study. , 1998, The Journal of animal ecology.

[2]  Robert E. Kenward,et al.  RANGES V: an analysis system for biological location data , 1996 .

[3]  E. Revilla,et al.  Spatial ecology of Iberian lynx and abundance of European rabbits in southwestern Spain , 2001 .

[4]  R. Cowling,et al.  Towards a profile of an endemic mountain fynbos flora: Implications for conservation , 1995 .

[5]  P. Ferreras,et al.  Spatial organization and land tenure system of the endangered Iberian lynx (Lynx pardinus) , 1997 .

[6]  P. Gaona,et al.  DYNAMICS AND VIABILITY OF A METAPOPULATION OF THE ENDANGERED IBERIAN LYNX (LYNX PARDINUS) , 1998 .

[7]  P. Krausman,et al.  Clarification of a technique for analysis of utilization-availability data , 1984 .

[8]  R. Villafuerte,et al.  Traditional management of scrubland for the conservation of rabbits Oryctolagus cuniculus and their predators in Doñana National Park, Spain , 1995 .

[9]  F. Palomares,et al.  Spatial Relationships Between Iberian Lynx and Other Carnivores in an Area of South-Western Spain , 1996 .

[10]  Paul C. Paquet,et al.  Conservation Biology and Carnivore Conservation in the Rocky Mountains , 1996 .

[11]  F. Palomares,et al.  Positive Effects on Game Species of Top Predators by Controlling Smaller Predator Populations: An Example with Lynx, Mongooses, and Rabbits , 1995 .

[12]  R. L. Harrison.  Toward a Theory of Inter-Refuge Corridor Design , 1992 .

[13]  C. Krebs,et al.  Behavioural responses of lynx to declining snowshoe hare abundance , 1985 .

[14]  Miguel Delibes,et al.  Iberian Lynx in a Fragmented Landscape: Predispersal, Dispersal, and Postdispersal Habitats , 2000 .

[15]  F. Palomares,et al.  The status and distribution of the Iberian lynx Felis pardina (Temminck) in Coto Doñana Area, SW Spain , 1991 .

[16]  J. F. Beltrán.  Temporal abundance pattern of the wild rabbit in Doñana, SW Spain , 1991 .

[17]  J. A. Litvaitis,et al.  Bobcat Habitat Use and Home Range Size in Relation to Prey Density , 1986 .

[18]  Michiel F. De Vires.  Large Herbivores and the Design of Large‐Scale Nature Reserves in Western Europe , 1995 .

[19]  Paul Beier,et al.  Determining Minimum Habitat Areas and Habitat Corridors for Cougars , 1993 .

[20]  Fabian M Jaksic,et al.  Predation Upon the European Rabbit (Oryctolagus cuniculus) in Mediterranean Habitats of Chile and Spain: A Comparative Analysis , 1981 .

[21]  James A. Cox,et al.  Movement Corridors: Conservation Bargains or Poor Investments? , 1992 .

[22]  R. Hobbs,et al.  Management of vegetation corridors: maintenance, rehabilitation and establishment , 1991 .

[23]  F. Palomares,et al.  Predation upon European rabbits and their use of open and closed patches in Mediterranean habitats , 1997 .

[24]  P. M. Rogers.  Ecology of the European Wild Rabbit Oryctolagus cuniculus (L.) in Mediterranean Habitats. II. Distribution in the Landscape of the Camargue, S. France , 1981 .

[25]  C. Arthur,et al.  The rabbit in continental Europe , 1994 .

[26]  P. Beja,et al.  The use of sighting data to analyse Iberian lynx habitat and distribution , 1999 .

[27]  P. Ferreras,et al.  Rates and causes of mortality in a fragmented population of Iberian lynx Felis pardina Temminck, 1824 , 1992 .

[28]  P. J. White,et al.  Factors regulating kit fox populations , 1997 .

[29]  R. Peterson,et al.  Wolves, Moose, and Tree Rings on Isle Royale , 1994, Science.

[30]  A. U.S.,et al.  Movement Corridors : Conservation Bargains or Poor Investments ? , 2022 .

[31]  M. Delibes.  Feeding ecology of the Spanish lynx in the Coto Dońana , 1980 .

[32]  F. Palomares.  Comparison of 3 methods to estimate rabbit abundance in a Mediterranean environment , 2001 .

[33]  M. Sandell.  The Mating Tactics and Spacing Patterns of Solitary Carnivores , 1989 .

[34]  M. Delibes,et al.  Current range and status of the Iberian lynx Felis pardina Temminck, 1824 in Spain , 1992 .

[35]  P. M. Rogers,et al.  Ecology of the European Wild Rabbit, Oryctolagus cuniculus (L.), in Mediterranean Habitats. I. Distribution in the Landscape of the Coto Donana, S. Spain , 1979 .