Random processes and phylogenetic loss caused by plant invasions

Lapiedra O., Sol D., Traveset A., Vila M. (2015) Random processes and phylogenetic loss caused by plant invasions. Global Ecology and Biogeography. : 0-0.
Enllaç
Doi: 10.1111/geb.12310

Resum:

Aim: Although biological invasions represent a major cause of biodiversity loss, the actual mechanisms driving species extinctions remain insufficiently understood. Here we investigate the role of three processes as drivers of phylogenetic loss in invaded local plant communities, namely the 'biotic resistance', 'environmental filtering' and 'functional equivalence' hypotheses. Location: Balearic Islands (western Mediterranean). Methods: We quantified the phylogenetic diversity and structure of 109 pairs of invaded and non-invaded local plant communities from two Mediterranean islands. Each pair contained one control plot and one plot invaded either by the deciduous tree Ailanthus altissima, the succulent subshrubs Carpobrotus spp. or the pseudoannual geophyte Oxalis pes-caprae. We combined generalized linear models, analyses of phylogenetic community structure and generalized linear mixed models using a Markov chain Monte Carlo technique (MCMCglmm) to contrast the 'biotic resistance', 'environmental filtering' and 'functional equivalence' hypotheses. Results: While the phylogenetic structure of the non-invaded communities was not more clustered or overdispersed than expected by chance, minimum phylogenetic distance to the invasive species increased in invaded assemblages, in which the magnitude of phylogenetic diversity loss ranged from 6 to 37% depending on the invader's identity. Invader or island identity did not explain the probabilities of native species becoming locally extinct. Rather, the likelihood of extinction was mainly explained by species abundance, with scarcer species exhibiting a higher chance of becoming locally extinct. Species identity explained a small fraction of the variation in extinction risk (12%), independently of each species' evolutionary history. Main conclusions: The most relevant driver of local extinction is a stochastic process where less abundant species tend to disappear more frequently irrespective of their evolutionary history. This has strong implications for conservation because it suggests that in the study region the invaders are unlikely to drive regional and global extinctions except in cases where the native species is already rare. © 2015 John Wiley & Sons Ltd.

Llegeix més

Singing in the city: High song frequencies are no guarantee for urban success in birds

Moiron M., Gonzalez-Lagos C., Slabbekoorn H., Sol D. (2015) Singing in the city: High song frequencies are no guarantee for urban success in birds. Behavioral Ecology. 26: 843-850.
Enllaç
Doi: 10.1093/beheco/arv026

Resum:

Urbanization involves dramatic environmental alterations, which can limit survival and reproduction of organisms and contribute to loss of biodiversity. One such alteration is anthropogenic noise, which biases natural ambient noise spectra toward low frequencies where it may interfere with acoustic communication among birds. Because vocalizing at higher frequencies could prevent masking by noise, it has been hypothesized that species with higher song frequencies should be less affected by urbanization. Indeed, evidence is accumulating that urban birds often vocalize at higher frequency than nonurban birds. However, the extent to which singing frequency affects their success in cities is less clear. We tested this hypothesis with a comprehensive phylogenetic Bayesian analysis comparing song frequency of songbirds from 5 continents with 4 measures of success in urbanized environments. Tolerance to urbanization was not associated with dominant or minimum song frequencies, regardless of the metric used to quantify urban success and the intensity of the urban alterations. Although song frequency was related to habitat preferences and body size of the species, none of these factors explained the lack of association with urban success. Singing high may be beneficial for signal perception under noisy conditions, but these high frequencies are apparently no guarantee for the success of bird species in urbanized environments. © The Author 2014. Published by Oxford University Press on behalf of the International Society for Behavioral Ecology.

Llegeix més

Integrating behavior into life-history theory: A comment on Wong and Candolin

Sol D., Maspons J. (2015) Integrating behavior into life-history theory: A comment on Wong and Candolin. Behavioral Ecology. 26: 677-678.
Enllaç
Doi: 10.1093/beheco/arv025

Resum:

[No abstract available]

Llegeix més

The Evolution of Innovativeness: Exaptation or Specialized Adaptation?

Sol, D. (2015) The Evolution of Innovativeness: Exaptation or Specialized Adaptation?. Animal Creativity and Innovation. : 163-182.
Enllaç
Doi: 10.1016/B978-0-12-800648-1.00006-1

Resum: