DOI: 10.1002/eap.2033
论文题名: Regional context and dispersal mode drive the impact of landscape structure on seed dispersal
作者: San-José M. ; Arroyo-Rodríguez V. ; Meave J.A.
刊名: Ecological Applications
ISSN: 10510761
出版年: 2020
卷: 30, 期: 2 语种: 英语
英文关键词: dispersal limitation
; dispersal syndrome
; landscape scale
; natural regeneration
; seed rain
; seed source limitation
Scopus关键词: anthropogenic effect
; biodiversity
; disturbance
; forest edge
; land use change
; landscape structure
; rainforest
; seed dispersal
; Los Tuxtlas
; Mexico [North America]
; Veracruz
; Animalia
; article
; forest fragmentation
; habitat
; human
; mortality rate
; quantitative analysis
; rain forest
; regeneration
; seed dispersal
英文摘要: Land-use change modifies the spatial structure of tropical landscapes, shaping global biodiversity patterns. Yet, it remains unknown how key ecological processes, such as seed dispersal, can be affected by changes in landscape patterns, and whether such effects differ among regions with different climate and disturbance intensity. We assessed the effect of five landscape metrics (forest cover, matrix openness, forest edge density, forest fragmentation, and interpatch distance) on the seed rain recorded in two Mexican fragmented regions (20 forest sites per region): the more deforested, defaunated, and windy Los Tuxtlas rainforest (LTX), and the better-preserved Lacandona rainforest (LAC). We quantified the proportions of dispersed tree species and their seeds, separately evaluating wind- and animal-dispersed species. Our findings support the hypothesis that forest loss is more important than fragmentation per se, negatively impacting the seed rain in both regions. As expected, landscape patterns were comparatively more important for wind-dispersed seeds in LTX, probably because of stronger wind events in this region. Specifically, proportions of wind-dispersed seeds and species decreased with increasing edge density, suggesting that forest edges prevent dispersal of wind-dispersed species, which may occur if edges create physical barriers that limit wind flow. This pattern can also be caused by source limitation in landscapes with more forest edges, as tree mortality rates usually increase at forest edges. The wind-dispersed seed rain was also positively related to matrix openness, especially in LTX, where wind flow can be favored by the dominance of treeless anthropogenic matrices. Surprisingly, the proportion of animal-dispersed seeds in LTX was positively related to matrix openness and patch isolation, suggesting that seed dispersers in more deforested regions may be forced to concentrate in isolated patches and use the available habitat more intensively. Yet, as expected, patch isolation limited wind-dispersed seeds in LAC. Therefore, dispersal (and potentially regeneration) of wind-dispersed trees is favored in regions exposed to stronger wind events, especially in landscapes dominated by regularly shaped patches surrounded by open areas. Conversely, animal-dispersed seeds are primarily favored by increasing forest cover. Preventing forest loss is therefore critical to promote animal seed dispersal and forest recovery in human-modified rainforests. © 2019 by the Ecological Society of America Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159016
Appears in Collections: 气候变化与战略
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作者单位: Instituto de Investigaciones en Ecosistemas y Sustentabilidad, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro 8701, Ex-Hacienda de San José de la Huerta, Morelia, Michoacán 58190, Mexico; Departamento de Ecología y Recursos Naturales, Facultad de Ciencias, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, Coyoacán, Mexico City, 04510, Mexico
Recommended Citation:
San-José M.,Arroyo-Rodríguez V.,Meave J.A.. Regional context and dispersal mode drive the impact of landscape structure on seed dispersal[J]. Ecological Applications,2020-01-01,30(2)