Luigi Boitani

Effectiveness of the global protected area network in representing species diversity

The Fifth World Parks Congress in Durban, South Africa, announced in September 2003 that the global network of protected areas now covers 11.5% of the planets land surface. This surpasses the 10% target proposed a decade earlier, at the Caracas Congress, for 9 out of 14 major terrestrial biomes. Such uniform targets based on percentage of area have become deeply embedded into national and international conservation planning. Although politically expedient, the scientific basis and conservation value of these targets have been questioned. In practice, however, little is known of how to set appropriate targets, or of the extent to which the current global protected area network fulfils its goal of protecting biodiversity. Here, we combine five global data sets on the distribution of species and protected areas to provide the first global gap analysis assessing the effectiveness of protected areas in representing species diversity. We show that the global network is far from complete, and demonstrate the inadequacy of uniform—that is, ‘one size fits all’—conservation targets.

Recovery of large carnivores in Europe’s modern human-dominated landscapes

The conservation of large carnivores is a formidable challenge for biodiversity conservation. Using a data set on the past and current status of brown bears (Ursus arctos), Eurasian lynx (Lynx lynx), gray wolves (Canis lupus), and wolverines (Gulo gulo) in European countries, we show that roughly one-third of mainland Europe hosts at least one large carnivore species, with stable or increasing abundance in most cases in 21st-century records. The reasons for this overall conservation success include protective legislation, supportive public opinion, and a variety of practices making coexistence between large carnivores and people possible. The European situation reveals that large carnivores and people can share the same landscape. Many populations of brown bears, lynx, grey wolves, and wolverines persist successfully outside protected areas in Europe. Success for Europes large carnivores? Despite pessimistic forecasts, Europes large carnivores are making a comeback. Chapron et al. report that sustainable populations of brown bear, Eurasian lynx, gray wolf, and wolverine persist in one-third of mainland Europe. Moreover, many individuals and populations are surviving and increasing outside protected areas set aside for wildlife conservation. Coexistence alongside humans has become possible, argue the authors, because of improved public opinion and protective legislation. Science, this issue p. 1517

Changes in land-use/land-cover patterns in Italy and their implications for biodiversity conservation

Land-use/land-cover change is the most important factor in causing biodiversity loss. The Mediterranean region has been affected by antropic disturbance for thousands of years, and is, nowadays, one of the most significantly altered hotspots in the world. However, in the last years a significant increase in forest cover has been measured. These new patterns are independent from planned conservation strategies and appear to have a substantial impact on landscapes and biodiversity. We used three land-use/land-cover maps (from 1960 to 2000) covering the Italian peninsula to analyze the pattern of land-use/land-cover change. We measured an increase in forests, especially in mountains, an increase in artificial areas, especially in coastal zones, and a decrease in pastures. Intensively cultivated areas showed a limited decrease while extensively cultivated ones showed a marked decrease. In the same period mammal and bird species followed a similar pattern, with forest birds, ungulates and carnivores increasing, and typically Mediterranean species decreasing. We suggest that our results may provide important information, which could be useful for conservation planning in the entire Mediterranean hotspot. We suggest that an increasing conservation effort should be made to protect the Mediterranean-type forests and scrublands, as well as traditional agricultural practices. Moreover, future conservation efforts should consider the broad socio-political and ecological processes that are most likely to occur across the whole hotspot, especially along coastal areas, and the network of protected areas should be functionally integrated in a conservation strategy that includes the human-dominated landscape.

Global gap analysis: Priority regions for expanding the global protected-area network

Abstract Protected areas are the single most important conservation tool. The global protected-area network has grown substantially in recent decades, now occupying 11.5% of Earths land surface, but such growth has not been strategically aimed at maximizing the coverage of global biodiversity. In a previous study, we demonstrated that the global network is far from complete, even for the representation of terrestrial vertebrate species. Here we present a first attempt to provide a global framework for the next step of strategically expanding the network to cover mammals, amphibians, freshwater turtles and tortoises, and globally threatened birds. We identify unprotected areas of the world that have remarkably high conservation value (irreplaceability) and are under serious threat. These areas concentrate overwhelmingly in tropical and subtropical moist forests, particularly on tropical mountains and islands. The expansion of the global protected-area network in these regions is urgently needed to prevent the loss of unique biodiversity.

Animal ecology meets GPS-based radiotelemetry: a perfect storm of opportunities and challenges

Global positioning system (GPS) telemetry technology allows us to monitor and to map the details of animal movement, securing vast quantities of such data even for highly cryptic organisms. We envision an exciting synergy between animal ecology and GPS-based radiotelemetry, as for other examples of new technologies stimulating rapid conceptual advances, where research opportunities have been paralleled by technical and analytical challenges. Animal positions provide the elemental unit of movement paths and show where individuals interact with the ecosystems around them. We discuss how knowing where animals go can help scientists in their search for a mechanistic understanding of key concepts of animal ecology, including resource use, home range and dispersal, and population dynamics. It is probable that in the not-so-distant future, intense sampling of movements coupled with detailed information on habitat features at a variety of scales will allow us to represent an animals cognitive map of its environment, and the intimate relationship between behaviour and fitness. An extended use of these data over long periods of time and over large spatial scales can provide robust inferences for complex, multi-factorial phenomena, such as meta-analyses of the effects of climate change on animal behaviour and distribution.

Noninvasive molecular tracking of colonizing wolf (Canis lupus) packs in the western Italian Alps.

We used noninvasive methods to obtain genetic and demographic data on the wolf packs (Canis lupus), which are now recolonizing the Alps, a century after their eradication. DNA samples, extracted from presumed wolf scats collected in the western Italian Alps (Piemonte), were genotyped to determine species and sex by sequencing parts of the mitochondrial DNA (mtDNA) control‐region and ZFX/ZFY genes. Individual genotypes were identified by multilocus microsatellite analyses using a multiple tubes polymerase chain reaction (PCR). The performance of the laboratory protocols was affected by the age of samples. The quality of excremental DNA extracts was higher in samples freshly collected on snow in winter than in samples that were older or collected during summer. Preliminary mtDNA screening of all samples allowed species identification and was a good predictor of further PCR performances. Wolf, and not prey, DNA targets were preferentially amplified. Allelic dropout occurred more frequently than false alleles, but the probability of false homozygote determinations was always < 0.001. A panel of six to nine microsatellites would allow identification of individual wolf genotypes, also whether related, with a probability of identity of < 0.015. Genealogical relationships among individuals could be determined reliably if the number of candidate parents was 6–8, and most of them had been sampled and correctly genotyped. Genetic data indicate that colonizing Alpine wolves originate exclusively from the Italian source population and retain a high proportion of its genetic diversity. Spatial and temporal locations of individual genotypes, and kinship analyses, suggest that two distinct packs of closely related wolves, plus some unrelated individuals, ranged in the study areas. This is in agreement with field observations.

Value of the IUCN Red List

1 Royama, T. (1992) Analytical Population Dynamics, Chapman & Hall2 Johst, K. and Wissel, C. (1997) Extinction risk in a temporallycorrelated environment. Theor. Popul. Biol. 52, 91–1003 McCarthy, M. and Lindenmayer, D.B. (2000) Spatially correlatedextinction in a metapopulation model of Leadbeater’s Possum. Biodiv.Conserv. 9, 47–634 Engen, S. et al. (2002) Migration and spatiotemporal variation inpopulation dynamics in a heterogeneous environment. Ecology 83,570–5795 Engen, S. et al. (2002) The spatial scale of population fluctuation andquasi-extinction risk. Am. Nat. 160, 439–4516 Gonzalez, A. and Holt, R.D. (2002) The inflationary effects ofenvironmental fluctuations in source–sink systems. Proc. Natl.Acad. Sci. U. S. A. 99, 14872–148777 Pulliam, H.R. (1988) Sources, sinks, and population regulation. Am.Nat. 132, 652–6618 Dias, P.C. (1996) Sources and sinks in population biology. Trends Ecol.Evol. 11, 326–3309 Faaborg, J. et al. (1998) Understanding fragmented midwestern land-scapes: the future. In Avian Conservation: Research and Management(Marzluff, J.M. and Sallabanks, R., eds) pp. 193–207, Island Press10 Murphy, M.T. (2001) Source-sink dynamics of a declining EasternKingbird population and the value of sink habitats. Conserv. Biol. 15,737–74811 Holt, R.D. et al. Impacts of environmental variability in openpopulations and communities: inflation in sink environments. Theor.Popul. Biol. (in press)12 Pulliam, H.R. and Danielson, B.J. (1991) Sources, sinks and habitatselection: a landscape perspective on population dynamics. Am. Nat.137, S50–S6613 Baillie, S.R. et al. (2000) Consequences of large-scale processes for theconservation of bird populations. J. Appl. Ecol. 37, 88–10214 Gundersen, G. et al. (2001) Source-sink dynamics: how sinks affectdemography of sources. Ecol. Lett. 4, 14–2115 Harrison, S. et al. (1988) Distribution of the bay checkerspot butterfly,Euphydryas editha bayensis: evidence for a metapopulations model.Am. Nat. 132, 360–38216 Stacey, P.B. and Taper, M. (1992) Environmental variation and thepersistence of small populations. Ecol. Appl. 2, 18–2917 Wootton, J.T. and Bell, D.A. (1992) A metapopulation model of theperegrine falcon in California: viability and management strategies.Ecol. Appl. 2, 307–32118 Harrison, S. (1991) Local extinction in a metapopulation context: anempirical evaluation. In Metapopulation dynamics: Empirical andTheoreticalInvestigations(Gilpin,M.E.andHanski,I.,eds)pp.73–88,Academic Press19 Thomas, C.D. and Kunin, W.E. (1999) The spatial structure ofpopulations. J. Anim. Ecol. 68, 647–65720 Paradis, E. et al. (1999) Dispersal and spatial scale affect synchrony inspatial population dynamics. Ecol. Lett. 2, 114–12021 Stacey, P.B. et al. (1997) Migration within metapopulations: theimpacts upon local population dynamics. In Metapopulation Biology:Ecology, Genetics, and Evolution (Hanski, I. and Gilpin, M.E., eds)pp. 267–291, Academic Press22 Schiegg, K. et al. (2002) The consequences of disrupted dispersal infragmented red-cockaded woodpecker populations. J. Anim. Ecol. 71,710–72123 Matthysen, E. et al. (2001) Local recruitment of great and blue tits(Parus major, P. caeruleus) in relation to study plot size and degree ofisolation. Ecography 24, 33–4224 Hudson, P.J. and Cattadori, I.M. (1999) The Moran effect: a cause ofpopulation synchrony. Trends Ecol. Evol. 14, 1–225 Earn, D.J.D. et al. (1998) Persistence, chaos and synchrony in ecologyand epidemiology. Proc. R. Soc. Lond. Ser. B 265, 7–10

The role of habitat quality in fragmented landscapes: a conceptual overview and prospectus for future research.

There is increasing empirical evidence that the quality of habitat patches (determined by either habitat degradation or natural heterogeneity in the quality of habitat) plays an important role in determining species distribution patterns and in regulating spatial dynamics in fragmented landscapes. However, to date, most of the debate has focused on whether or not to include habitat variables in fragmentation studies, and we still lack general conclusions as well as standard and robust research approaches. In this paper we show how a weak conceptualization of “patch quality” and the inappropriate choice of target surrogate variables (e.g., density is often used as an indicator of patch quality) have mainly produced case-specific results, rather than general conclusions. We then identify weaknesses in the inclusion of habitat quality measurements within fragmentation studies. In particular, we focus on: (1) the lack of appropriate experimental design, outlining how few studies have actually included a gradient of habitat quality in their sample; (2) the lack of fundamental information provided (e.g., lack of standard outputs), which in turn hampers the possibility of carrying out meta-analyses. We finally synthesize available knowledge from empirical studies and highlight the different conceptual frameworks needed for patch occupancy versus patch use studies.

It's time to work together and stop duplicating conservation efforts ...

We strongly support initiatives to produce clear, efficient and practical goals for conservation to guide biodiversity planners and decision-makers in governments, agencies, conventions and non-governmental organizations (NGOs). However, as things stand there is only limited consensus on global conservation priorities at international level. We believe that the time is now right for scientists and practitioners to work together to develop a commonly adopted blueprint for action.

A comparison of scat-analysis methods to assess the diet of the wolf Canis lupus

Six scat-analysis methods were compared and tested for differential assessment of a wolf Canis lupus diet in the Northern Apennine Mountains, Italy. A sample of 217 wolf scats was analysed using standardised laboratory techniques, and the recovered undigested remains were quantified according to the following diet measurements: frequency of occurrence, dry weight (estimated and measured), relative volume, and biomass ingested (two methods). With the exception of one of the biomass methods, there was no significant disagreement between the procedures examined. However, some discrepancies between rankings from different methods indicated the sources of bias that should be accounted for to avoid misleading conclusions. Frequency data can be corrected to reduce some of the associated forms of bias, whereas rankings by weight and volume appear affected by the structure of undigested remains. Although to different extents, all the methods which rank food items according to direct measures of the undigested remains, i.e. by frequency, weight, and volume, suffer from the surface to volume ratio bias of varying prey sizes. Linear-regression biomass models correct for the surface/volume bias, but there are some drawbacks when applying them, and they are limited to mammalian prey. Applicability of the biomass models should be evaluated on the basis of diet composition and prey sizes, and results carefully interpreted in concert with other field-collected information. Interpretation of scat-analysis data in order to assess the diet of wolves, as well as of other carnivores, would be greatly enhanced by comparing results obtained with two or more methods.