Comparing Cognition: Comment on Roth and Dicke.

Reader SM, Sol D, Lefebvre L (2005) Comparing Cognition: Comment on Roth and Dicke. Trends in Cognitive Sciences 9: 411

Big brains, enhanced cognition and response of birds to novel environments.

Sol D, Duncan RP, Blackburn TM, Cassey P, Lefebvre L (2005) Big brains, enhanced cognition and response of birds to novel environments. Proceedings of the National Academy of Science (USA) 1021: 5460-5465

Las especies introducidas en España. A: R. Martí, J.C. del Moral (eds). Atlas de las aves reproductoras de España.

Sol D, Santos DM, Clavell J (2005) Las especies introducidas en España. A: R. Martí, J.C. del Moral (eds). Atlas de las aves reproductoras de España. Dirección General de la Naturaleza-Sociedad Española de Ornitología, Madrid, p. 628.

How predictable is the abundance of double gametocyte infections?

Jovani R., Sol D. (2005) How predictable is the abundance of double gametocyte infections?. Parasitology Research. 97: 84-86.
Enllaç
Doi: 10.1007/s00436-005-1405-8

Resum:

It has been proposed that erythrocytes, infected by one male and one female gametocyte, enhance malaria transmission by lowering encounter time between male and female gametes once inside the mosquito vector. This may have important implications if they occur in human Plasmodium infections. Double gametocyte infections (DGIs) have been found in Plasmodium cultures, but it is thought that they are an artefact due to the artificially high crowding of cultures. Here, we studied gametocyte density and DGI occurrence in Haemoproteus columbae infecting feral pigeons (Columba livia), to determine if crowding is the key factor producing DGIs. We demonstrate that DGIs are not a spurious phenomenon or an artefact of crowding, but occur in any gametocyte density in a proportion a bit higher than that expected by a Poisson distribution. © Springer-Verlag 2005.

Llegeix més

Establishment success across convergent Mediterranean ecosystems: An analysis of bird introductions

Kark S., Sol D. (2005) Establishment success across convergent Mediterranean ecosystems: An analysis of bird introductions. Conservation Biology. 19: 1519-1527.
Enllaç
Doi: 10.1111/j.1523-1739.2005.004365.x

Resum:

Concern over the impact of invaders on biodiversity and on the functioning of ecosystems has generated a rising tide of comparative analyses aiming to unveil the factors that shape the success of introduced species across different regions. One limitation of these studies is that they often compare geographically rather than ecologically defined regions. We propose an approach that can help address this limitation: comparison of invasions across convergent ecosystems that share similar climates. We compared avian invasions in five convergent mediterranean climate systems around the globe. Based on a database of 180 introductions representing 121 avian species, we found that the proportion of bird species successfully established was high in all mediterranean systems (more than 40% for all five regions). Species differed in their likelihood to become established, although success was not higher for those originating from mediterranean systems than for those from nonmediterranean regions. Controlling for this taxonomic effect with generalized linear mixed models, species introduced into mediterranean islands did not show higher establishment success than those introduced to the mainland. Susceptibility to avian invaders, however, differed substantially among the different mediterranean regions. The probability that a species will become established was highest in the Mediterranean Basin and lowest in mediterranean Australia and the South African Cape. Our results suggest that many of the birds recently introduced into mediterranean systems, and especially into the Mediterranean Basin, have a high potential to establish self-sustaining populations. This finding has important implications for conservation in these biologically diverse hotspots. ©2005 Society for Conservation Biology.

Llegeix més

Comparing cognition across species [3] (multiple letters)

Reader S.M., Sol D., Lefebvre L., Roth G., Dicke U. (2005) Comparing cognition across species [3] (multiple letters). Trends in Cognitive Sciences. 9: 411-412.
Enllaç
Doi: 10.1016/j.tics.2005.07.007

Resum:

[No abstract available]

Llegeix més

Brain size, innovative propensity and migratory behaviour in temperate Palaearctic birds

Sol D., Lefebvre L., Rodríguez-Teijeiro J.D. (2005) Brain size, innovative propensity and migratory behaviour in temperate Palaearctic birds. Proceedings of the Royal Society B: Biological Sciences. 272: 1433-1441.
Enllaç
Doi: 10.1098/rspb.2005.3099

Resum:

The evolution of migration in birds remains an outstanding, unresolved question in evolutionary ecology. A particularly intriguing question is why individuals in some species have been selected to migrate, whereas in other species they have been selected to be sedentary. In this paper, we suggest that this diverging selection might partially result from differences among species in the behavioural flexibility of their responses to seasonal changes in the environment. This hypothesis is supported in a comparative analysis of Palaearctic passerines. First, resident species tend to rely more on innovative feeding behaviours in winter, when food is harder to find, than in other seasons. Second, species with larger brains, relative to their body size, and a higher propensity for innovative behaviours tend to be resident, while less flexible species tend to be migratory. Residence also appears to be less likely in species that occur in more northerly regions, exploit temporally available food sources, inhabit non-buffered habitats and have smaller bodies. Yet, the role of behavioural flexibility as a response to seasonal environments is largely independent of these other factors. Therefore, species with greater foraging flexibility seem to be able to cope with seasonal environments better, while less flexible species are forced to become migratory. © 2005 The Royal Society.

Llegeix més

Behavioral drive or behavioral inhibition in evolution: Subspecific diversification in holarctic passerines

Sol D., Stirling D.G., Lefebvre L. (2005) Behavioral drive or behavioral inhibition in evolution: Subspecific diversification in holarctic passerines. Evolution. 59: 2669-2677.
Enllaç
Doi: 10.1554/05-196.1

Resum:

Behavioral changes have long been hypothesized to be an important driver of evolutionary diversification in animals, as they expose individuals to new environmental pressures and thus favor evolutionary divergence. There have been few empirical tests of this hypothesis, however, and the mechanisms linking behavioral changes and diversification processes remain controversial. We show here that Holarctic passerines with large brain size relative to body size, a character correlated with a high propensity for behavioral changes, generally have experienced more extensive subspecific diversification. This effect appears to be largely independent of other well-known mechanisms thought to promote diversification. As suggested by path analysis, relative brain size seems to affect diversification directly rather than indirectly through its presumed effect on range expansion, which is consistent with the original formulation of the behavioral drive hypothesis. Thus, the results support the long-held, intuitive hypothesis that behavioral changes facilitate evolutionary diversification. © 2005 The Society for the Study of Evolution. All rights reserved.

Llegeix més

Global patterns of introduction effort and establishment success in birds

Cassey P., Blackburn T.M., Sol D., Duncan R.P., Lockwood J.L. (2004) Global patterns of introduction effort and establishment success in birds. Proceedings of the Royal Society B: Biological Sciences. 271: 0-0.
Enllaç
Doi: 10.1098/rsbl.2004.0199

Resum:

Theory suggests that introduction effort (propagule size or number) should be a key determinant of establishment success for exotic species. Unfortunately, however, propagule pressure is not recorded for most introductions. Studies must therefore either use proxies whose efficacy must be largely assumed, or ignore effort altogether. The results of such studies will be flawed if effort is not distributed at random with respect to other characteristics that are predicted to influence success. We use global data for more than 600 introduction events for birds to show that introduction effort is both the strongest correlate of introduction success, and correlated with a large number of variables previously thought to influence success. Apart from effort, only habitat generalism relates to establishment success in birds. ©2004 The Royal Society.

Llegeix més

Survey of the naturalised plants and vertebrates in peninsular Spain.

Vilà M, García-Berthou E, Sol D, Pino J (2001) Survey of the naturalised plants and vertebrates in peninsular Spain. Ecologia Mediterranea 27:55-67.

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