Are epiphytic lichens in young forests limited by local dispersal?

Dettki, Holger; Klintberg, Peter; Esseen, Per‐Anders

doi:10.1080/11956860.2000.11682601

Cited by 133 publications

(117 citation statements)

References 19 publications

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“…Based on this knowledge, previous studies have evaluated the underlying process of epiphytic distribution, focussing on dispersal and establishment. Species dispersal can be limited by distance (Dettki et al 2000;Zoller et al 2000;Walser 2004), depending on the reproduction mode (Hedenás et al 2003;Lobel et al 2009), while establishment can be dependent on habitat quality Heinken et al 2007;Láttman et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Fine spatial pattern of an epiphytic lichen species is affected by habitat conditions in two forest types in the Iberian Mediterranean region

et al. 2011

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Section: Introductionmentioning

confidence: 99%

Fine spatial pattern of an epiphytic lichen species is affected by habitat conditions in two forest types in the Iberian Mediterranean region

et al. 2011

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“…Mounting indirect evidence from studies on epiphytic (i.e., tree-inhabiting) cryptogams of temperate regions suggests that dispersal limitation, as opposed to microsite variability, best explains local distribution patterns in both anthropogenically disturbed (Dettki et al 2002;Lindén et al 2003;Snäll et al 2003) and old-growth (Sillet et al 2000) forest habitats. Likewise, our results, which uniquely include direct measurements of epiphyll colonization rates, corroborate the results of such studies conducted in temperate areas.…”

Section: Colonizationmentioning

confidence: 99%

Metapopulation Extinction Thresholds in Rain Forest Remnants

Zartman¹,

Shaw²

2006

The American Naturalist

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Although habitat fragmentation is a major threat to global biodiversity, the demographic mechanisms underlying species loss from tropical forest remnants remain largely unexplored. In particular, no studies at the landscape scale have quantified fragmentation's impacts on colonization, extinction, and local population growth simultaneously. In central Amazonia, we conducted a multiyear demographic census of 292 populations of two leaf-inhabiting (i.e., epiphyllous) bryophyte species transplanted from continuous forest into a network of 10 study sites ranging from 1, 10, and 100 to 110,000 ha in size. All populations experienced significantly positive local growth ( ) and a nearly constant per-generational l 1 1 extinction probability (15%). However, experimental leaf patches in reserves of ≥100 ha experienced nearly double (48%) the colonization probability observed in small reserves (27%), suggesting that the proximate cause of epiphyll species loss in small fragments (≤10 ha) is reduced colonization. Nonetheless, populations of small fragments exhibit rates of colonization above patch extinction, positive local growth, and low temporal variation, which are features that should theoretically reduce the probability of extinction. This result suggests that for habitat-tracking metapopulations subject to frequent and stochastic turnover events, including epiphylls, colonization/extinction ratios must be maintained well above unity to ensure metapopulation persistence.

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“…Furthermore, accumulating evidence from establishment experiments (Sillet et al, 2000;Gunnarsson and Soderstrom, in review), as well as patch-occupancy distributions (Gu et al, 2001;Dettki et al, 2002;Johansson and Ehrlen, 2003;Zartman and Nascimento, 2006) for both bryophytes and lichens repeatedly point to dispersal limitation to explain species absences from fragmented habitats. For example, Zartman and Nascimento (2006) used abundance-occupancy patterns in fragmented and continuous forests to conclude that reduced dispersal capacity, as opposed to the impacts of altered forest edge micro-climates, is the causal demographic mechanism accounting for the abrupt declines in bryophyte diversity in small (<10-ha) tropical forest fragments.…”

mentioning

confidence: 99%