Limits...
Modelling the effects of sanitary policies on European vulture conservation.

Margalida A, Colomer MÀ - Sci Rep (2012)

Bottom Line: Biodiversity losses are increasing as a consequence of negative anthropogenic effects on ecosystem dynamics.A novel computational model (P-systems) was used to model these effects, forecasting a rapid decline in the Eurasian griffon vulture (Gyps fulvus).By contrast, vulture species with greater plasticity in their dietary range appeared less sensitive to declining food availability.

View Article: PubMed Central - PubMed

Affiliation: Division of Conservation Biology, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland. antoni.margalida@iee.unibe.ch

ABSTRACT
Biodiversity losses are increasing as a consequence of negative anthropogenic effects on ecosystem dynamics. However, the magnitude and complexity of these effects may still be greatly underestimated. Most Old World vultures have experienced rapid population declines in recent years. In Europe, their immediate conservation depends on changes in health regulations affecting the availability of food provided by domestic carcasses. Information is lacking on the effects of a hypothetical food shortage on the population dynamics of vultures, and is necessary to assess the potential impacts of policy decisions on future changes in biodiversity and ecosystem services. A novel computational model (P-systems) was used to model these effects, forecasting a rapid decline in the Eurasian griffon vulture (Gyps fulvus). By contrast, vulture species with greater plasticity in their dietary range appeared less sensitive to declining food availability. This study extends our understanding of vulture ecosystem services, which have social and economic implications.

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Spatial and temporal estimate of the difference between the biomass estimated by the model and the energetic requirements for the current avian scavenger population standardized by surface unit (expressed in calories per km2) in the ecosystem, for each of 10 municipalities in Catalonia, Northern Spain, according to the four scenarios of food availability considered (100%, 50%, 25% and 0% of food provided by domestic ungulates).
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f1: Spatial and temporal estimate of the difference between the biomass estimated by the model and the energetic requirements for the current avian scavenger population standardized by surface unit (expressed in calories per km2) in the ecosystem, for each of 10 municipalities in Catalonia, Northern Spain, according to the four scenarios of food availability considered (100%, 50%, 25% and 0% of food provided by domestic ungulates).

Mentions: Meat was predicted to be the major factor limiting the survival of avian scavengers during winter and summer (Figure 1). In the breeding season (winter), the available food was predicted to be insufficient to cover energetic requirements in two areas with half the domestic carcasses available (PJ and AU), which increased to three (also AR) with a quarter of the domestic carrion available (current situation) and six (also PJ, N and S) without domestic carcasses available (with insufficient bone biomass in N). In the summer scenario, food availability was predicted to be higher due to transhumance. However, the food available was also predicted to be insufficient in one area (PJ) with half the domestic carcasses, increasing to three areas (also AR and AU) with a quarter of the domestic carrion available to vultures and five (also N and S) without domestic carcasses. From a population perspective, these three areas (AR, PJ and AU) were the most important for the avian scavenger guild because the areas with a quarter of the domestic carcasses available contain 59% of the bearded vulture population, 56% of Egyptian vultures, 71% of griffon vultures, and 100% of cinereous vultures in the study area.


Modelling the effects of sanitary policies on European vulture conservation.

Margalida A, Colomer MÀ - Sci Rep (2012)

Spatial and temporal estimate of the difference between the biomass estimated by the model and the energetic requirements for the current avian scavenger population standardized by surface unit (expressed in calories per km2) in the ecosystem, for each of 10 municipalities in Catalonia, Northern Spain, according to the four scenarios of food availability considered (100%, 50%, 25% and 0% of food provided by domestic ungulates).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3475340&req=5

f1: Spatial and temporal estimate of the difference between the biomass estimated by the model and the energetic requirements for the current avian scavenger population standardized by surface unit (expressed in calories per km2) in the ecosystem, for each of 10 municipalities in Catalonia, Northern Spain, according to the four scenarios of food availability considered (100%, 50%, 25% and 0% of food provided by domestic ungulates).
Mentions: Meat was predicted to be the major factor limiting the survival of avian scavengers during winter and summer (Figure 1). In the breeding season (winter), the available food was predicted to be insufficient to cover energetic requirements in two areas with half the domestic carcasses available (PJ and AU), which increased to three (also AR) with a quarter of the domestic carrion available (current situation) and six (also PJ, N and S) without domestic carcasses available (with insufficient bone biomass in N). In the summer scenario, food availability was predicted to be higher due to transhumance. However, the food available was also predicted to be insufficient in one area (PJ) with half the domestic carcasses, increasing to three areas (also AR and AU) with a quarter of the domestic carrion available to vultures and five (also N and S) without domestic carcasses. From a population perspective, these three areas (AR, PJ and AU) were the most important for the avian scavenger guild because the areas with a quarter of the domestic carcasses available contain 59% of the bearded vulture population, 56% of Egyptian vultures, 71% of griffon vultures, and 100% of cinereous vultures in the study area.

Bottom Line: Biodiversity losses are increasing as a consequence of negative anthropogenic effects on ecosystem dynamics.A novel computational model (P-systems) was used to model these effects, forecasting a rapid decline in the Eurasian griffon vulture (Gyps fulvus).By contrast, vulture species with greater plasticity in their dietary range appeared less sensitive to declining food availability.

View Article: PubMed Central - PubMed

Affiliation: Division of Conservation Biology, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland. antoni.margalida@iee.unibe.ch

ABSTRACT
Biodiversity losses are increasing as a consequence of negative anthropogenic effects on ecosystem dynamics. However, the magnitude and complexity of these effects may still be greatly underestimated. Most Old World vultures have experienced rapid population declines in recent years. In Europe, their immediate conservation depends on changes in health regulations affecting the availability of food provided by domestic carcasses. Information is lacking on the effects of a hypothetical food shortage on the population dynamics of vultures, and is necessary to assess the potential impacts of policy decisions on future changes in biodiversity and ecosystem services. A novel computational model (P-systems) was used to model these effects, forecasting a rapid decline in the Eurasian griffon vulture (Gyps fulvus). By contrast, vulture species with greater plasticity in their dietary range appeared less sensitive to declining food availability. This study extends our understanding of vulture ecosystem services, which have social and economic implications.

Show MeSH