Parasitism and migration in southern palaearctic populations of the painted lady butterfly, vanessa cardui (lepidoptera: Nymphalidae).

Stefanescu C, Askew RR, Corbera J, Shaw MR (2012). Parasitism and migration in southern palaearctic populations of the painted lady butterfly, vanessa cardui (lepidoptera: Nymphalidae). European Journal of Entomology 109: 85-94.

Habitat associations of species show consistent but weak responses to climate

Suggitt A.J., Stefanescu C., Páramo F., Oliver T., Anderson B.J., Hill J.K., Roy D.B., Brereton T., Thomas C.D. (2012) Habitat associations of species show consistent but weak responses to climate. Biology Letters. 8: 590-593.
Enllaç
Doi: 10.1098/rsbl.2012.0112

Resum:

Different vegetation types can generate variation in microclimates at local scales, potentially buffering species from adverse climates. To determine if species could respond to such microclimates under climatic warming, we evaluated whether ectothermic species (butterflies) can exploit favourable microclimates and alter their use of different habitats in response to year-to-year variation in climate. In both relatively cold (Britain) and warm (Catalonia) regions of their geographical ranges,most species shifted into cooler, closed habitats (e.g. woodland) in hot years, and into warmer, open habitats (e.g. grassland) in cooler years. Additionally, three-quarters of species occurred in closed habitats more frequently in the warm region than in the cool region. Thus, species shift their local distributions and alter their habitat associations to exploit favourable microclimates, although the magnitude of the shift (approx. 1.3% of individuals from open to shade, per degree Celsius) is unlikely to buffer species from impacts of regional climate warming. This journal is © 2012 The Royal Society.

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Moroccan source areas for the Painted Lady butterfly, Vanessa cardui (Nymphalidae: Nymphalinae), migrating into Europe in spring.

Stefanescu C, Alarcón M, Izquierdo R, Páramo F, Àvila A (2011) Moroccan source areas for the Painted Lady butterfly, Vanessa cardui (Nymphalidae: Nymphalinae), migrating into Europe in spring. Journal of the Lepidopterists Society 65: 15-26.

El deute d’extinció: una amenaça latent en una Catalunya canviant?.

Pino J, Guardiola M, Rodà F, Stefanescu C (2011) El deute d’extinció: una amenaça latent en una Catalunya canviant?. L'Atzavara 20: 17-27.

Llebot E. (ed). Impactes, vulnerabilitat i retroalimentacions climàtiques als ecosistemes terrestres catalans. Segon informe sobre el canvi climàtic a Catalunya.

Peñuelas J, Filella I, Estiarte M, Ogaya R, Llusià J, Sardans J, Jump A, Curiel J, Carnicer J, Rutishauser T, Rico L, Keenan T, Garbulsky M, Coll M, Diaz de Quijano M, Seco R, Rivas-Ubach A, Silva J, Boada M, Stefanescu C, Lloret F, Terradas J (2011) Llebot E. (ed). Impactes, vulnerabilitat i retroalimentacions climàtiques als ecosistemes terrestres catalans. Segon informe sobre el canvi climàtic a Catalunya. Institut d'Estudis Catalans i Generalitat de Catalunya. Barcelona, pp. 373-407.

Determinants of species richness in generalist and specialist Mediterranean butterflies: The negative synergistic forces of climate and habitat change

Stefanescu C., Carnicer J., Peñuelas J. (2011) Determinants of species richness in generalist and specialist Mediterranean butterflies: The negative synergistic forces of climate and habitat change. Ecography. 34: 353-363.
Enllaç
Doi: 10.1111/j.1600-0587.2010.06264.x

Resum:

Although it is well established that butterfly richness is affected by climate and human factors (e.g. habitat disturbance and degradation) at different spatial scales, the drivers behind these changes vary greatly according to the geographical region and the ecology of the species concerned. It is essential that this variation be understood if trends in diversity are to be predicted with any degree of confidence under a scenario of global change. Here we examine patterns of butterfly species richness among groups differing in degree of habitat specialization, diet breadth and mobility in the north-west Mediterranean Basin, a European hotspot for this taxon. We analyze a large number of butterfly communities and take into consideration the main potential drivers, that include climatic, geographic and resource variables, landscape structure and human environmental impact at different spatial scales. Our study shows that both climatic and anthropogenic factors play an important role in determining butterfly species richness in the north-west Mediterranean Basin, but that their relative impact differs between specialist and generalist groups. At lower altitudes, water availability, a product of the interplay between temperature and rainfall, and negative effects of temperature appear as the most determinant factors. Maximum diversity was observed at mid-altitudes, which reveals the importance from a conservation point of view of Mediterranean mountain ranges. The results suggest serious population declines in specialist species restricted to mountain areas as a result of climate warming in combination with habitat loss caused by the abandonment of grazing and mowing. They also suggest negative trends for generalist species due to an increase in aridity in combination with an increase in intensification of human land use in lowland areas. Such synergies are expected to lead to rapid declines in Mediterranean butterfly populations in the coming years, thereby posing a severe threat for the conservation of European biodiversity. © 2011 The Authors. Ecography © 2011 Ecography.

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La migració de les papallones: el cas de Vanessa cardui.

Àvila A, Stefanescu C (2010) La migració de les papallones: el cas de Vanessa cardui. Omnis Cellula 25:7.

L’ús de models font-receptor per determinar àrees font de components biològics (pol·len i papallones).

Alarcón M, Àvila A, Belmonte J, Stefanescu C, Izquierdo R (2010) L’ús de models font-receptor per determinar àrees font de components biològics (pol·len i papallones). Tethys 7: 3-10. doi:10.3369/tethys.2010.7.01. ISSN-1697-1523. eISSN-1139-3394.

Impactes, vulnerabilitat i retroalimentacions climàtiques als ecosistemes terrestres catalans. A: Llebot E. (ed). Segon informe sobre el canvi climàtic a Catalunya.

Peñuelas J, Filella I, Estiarte M, Ogaya R, Llusià J, Sardans J, Jump A, Curiel J, Carnicer J, Rutishauser T, Rico L, Keenan T, Garbulsky M, Coll M, Díaz de Quijano M, Seco R, Rivas-Ubach A, Silva J, Boada M, Stefanescu C, Lloret F, Terradas J (2010) Impactes, vulnerabilitat i retroalimentacions climàtiques als ecosistemes terrestres catalans. A: Llebot E. (ed). Segon informe sobre el canvi climàtic a Catalunya. Institut d'Estudis Catalans i Generalitat de Catalunya. pp. 373-407.

Habitat fragmentation causes immediate and time-delayed biodiversity loss at different trophic levels

Krauss J., Bommarco R., Guardiola M., Heikkinen R.K., Helm A., Kuussaari M., Lindborg R., Öckinger E., Pärtel M., Pino J., Pöyry J., Raatikainen K.M., Sang A., Stefanescu C., Teder T., Zobel M., Steffan-Dewenter I. (2010) Habitat fragmentation causes immediate and time-delayed biodiversity loss at different trophic levels. Ecology Letters. 13: 597-605.
Enllaç
Doi: 10.1111/j.1461-0248.2010.01457.x

Resum:

Intensification or abandonment of agricultural land use has led to a severe decline of semi-natural habitats across Europe. This can cause immediate loss of species but also time-delayed extinctions, known as the extinction debt. In a pan-European study of 147 fragmented grassland remnants, we found differences in the extinction debt of species from different trophic levels. Present-day species richness of long-lived vascular plant specialists was better explained by past than current landscape patterns, indicating an extinction debt. In contrast, short-lived butterfly specialists showed no evidence for an extinction debt at a time scale of c. 40 years. Our results indicate that management strategies maintaining the status quo of fragmented habitats are insufficient, as time-delayed extinctions and associated co-extinctions will lead to further biodiversity loss in the future. © 2010 Blackwell Publishing Ltd/CNRS.

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