Variation in dispersability among mainland and island populations of three wind dispersed plant species

Fresnillo, Belén; Ehlers, Bodil K.

doi:10.1007/s00606-007-0615-1

Cited by 49 publications

(43 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although experimental support for this prediction is equivocal (contrast, e.g. Cody &Overton 1996 andFresnillo &Ehlers 2008;Talavera, Arista & Ortiz 2012), oceanic islands are therefore traditionally perceived to be evolutionary dead ends (Bellemain & Ricklefs 2008). These predictions are similar to theoretical metapopulation studies suggesting that dispersal ability significantly decreases along a successional gradient owing to genetic differences between young and old populations (Olivieri, Michalakis & Gouyon 1995).…”

Section: Introductionsupporting

confidence: 74%

Baker's law and the island syndromes in bryophytes

et al. 2013

View full text Add to dashboard Cite

Summary1. The evolution of island syndromes has long served as a model to understand the mechanisms accounting for phenotypic differentiation. Combining literature data with actual observations, we determine whether typical syndromes such as the loss of dispersal power and the bias towards selfcompatibility (Baker's law) apply to vagile organisms, using bryophytes as a model. 2. The life-history traits (LHTs) observed in oceanic island floras were statistically different from those observed on continents, evidencing the evolution of island syndromes. In contrast, LHTs of continental and continental island floras were similar, pointing to differences in migration intensity between continents, continental islands and oceanic islands. 3. The proportion of bisexual species was significantly higher on oceanic islands than on continents. A significant proportion of species that are unisexual or bisexual on continents shifted towards exclusive bisexuality on oceanic islands, suggesting that Baker's law applies to bryophytes. The underlying mechanisms, however, probably differ from in situ selection for selfing. 4. The proportion of species producing specialized asexual diaspores, which are assumed to play a role in short-distance dispersal (SDD), was higher on oceanic islands than on continents. The proportion of species producing spores, which are involved in long-distance dispersal (LDD), exhibited the reverse trend, suggesting a shift in the prevalent reproductive strategy to favour SDD on oceanic islands. Approximately 50% of the species, however, maintained the ability to produce sporophytes on oceanic islands, and the relative frequency of fertile shoots within collections of four model species was even higher on islands than on continents. 5. Synthesis. Bryophytes exhibit typical island syndromes, indicating that migration rates between oceanic islands and continents are not sufficient to prevent the effects of genetic drift and contradicting the view that the sea does not impede migration in the group. Significant shifts in life-history traits (LHTs) towards increased production of specialized asexual diaspores and decreased sporophyte production on oceanic islands indeed point to a global loss of long-distance dispersal (LDD) ability. The maintenance of traits characteristic for LDD in a large number of species has, however, substantial consequences for our understanding of island plant evolution, and in particular, for our vision of islands as evolutionary dead ends.

show abstract

Section: Introductionsupporting

confidence: 74%

Baker's law and the island syndromes in bryophytes

et al. 2013

View full text Add to dashboard Cite

show abstract

“…4e and 5). This fact can be explained as well by the reduction of dispersal ability in coastal or island plant populations (Cody and Overton, 1996;Fresnillo and Ehlers, 2008;Harper et al, 1970). Also, some insular species of Asteraceae from the Pacific Islands are distinguished by reduction of dispersial mechanisms (Carlquist, 1966).…”

Section: Discussionmentioning

confidence: 97%

“…Generally, species living on islands have reduced dispersal ability compared to species from the mainland (Cody and Overton, 1996;Fresnillo and Ehlers, 2008;Harper et al, 1970). Reduction in dispersal potential increases with the age of island's populations (Cody and Overton, 1996).…”

Section: Discussionmentioning

confidence: 99%

Morphological variability of achenes of some European populations of Lactuca serriola L.

Novotná

Doležalová

Lebeda

et al. 2011

Flora - Morphology, Distribution, Functional Ecology of Plants

View full text Add to dashboard Cite

“…As the dispersal ability is related with the falling rate, we conducted an experiment to measure the time that it has taken for seeds to travel along a plastic tube (Fresnillo & Ehlers 2008). The tube is 178 cm long and 50 cm wide, for it is extremely necessary to prevent horizontal air currents and provide a 'free air-current' work space (Fresnillo & Ehlers 2008).…”

Section: Drop Time Of Seedsmentioning

confidence: 99%

“…The tube is 178 cm long and 50 cm wide, for it is extremely necessary to prevent horizontal air currents and provide a 'free air-current' work space (Fresnillo & Ehlers 2008). The tube is longer than the one previously used to reduce the error caused by the human reaction time and it is wide enough to avoid the interference with wall during the falling process.…”

Section: Drop Time Of Seedsmentioning

confidence: 99%