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| DOI | 10.1111/1365-2745.14259 |
| Foliar disease incidence in a tropical seedling community is density dependent and varies along a regional precipitation gradient | |
| 发表日期 | 2024 |
| ISSN | 0022-0477 |
| EISSN | 1365-2745 |
| 起始页码 | 112 |
| 结束页码 | 3 |
| 卷号 | 112期号:3 |
| 英文摘要 | Many studies identify fungal and oomycete phytopathogens as natural enemies capable of influencing plant species composition and promoting diversity in plant communities. However, little is known about how plant-pathogen interactions vary along regional abiotic gradients or with tree species characteristics, which limits our understanding of the causes of variation in tree species richness.We surveyed 10,756 seedlings from 272 tree species for disease symptoms along a mean annual precipitation gradient in the tropical wet forests of Central Panama for 3 months in the early wet season (June-August) and 2 months in the following dry season (March-April). Over 99% of observed disease symptoms were caused by necrotrophic foliar pathogens, while less than 1% of symptoms were attributed to soilborne pathogens. Foliar disease incidence was inversely related to mean annual precipitation, a pattern which may be due to greater disease susceptibility among dry forest species.Foliar disease incidence increased with conspecific seedling density but did not respond to the proximity of conspecific adults. Although foliar disease incidence decreased as mean annual precipitation increased, the strength of conspecific density- or distance-dependence was independent of the precipitation gradient.Seedlings of common tree species and species dispersed by non-flying mammals had a higher risk of foliar pathogen incidence. Increased disease in common species may help reduce their dominance.Synthesis. The increases in foliar pathogen incidence with conspecific seedling density, species abundance, and dispersal mechanism indicate that foliar disease incidence is non-random and may contribute to the regulation of tropical plant communities and species coexistence. Furthermore, the relationships between foliar disease incidence, dispersal mechanism and precipitation suggest plant-pathogen interactions could shift as a response to climate change and disruption of the disperser community. Muchos estudios han identificaban a los fitopatogenos fungicos y oomicetos como enemigos naturales con capaz de influir la composicion de especies de plantas y promover la diversidad en las comunidades vegetales. Sin embargo, se sabe poco sobre como varian las interacciones planta-patogeno a lo largo de gradientes abioticos regionales o con las caracteristicas de las especies de arboles, lo que limita nuestra comprension de las causas de la variacion en la riqueza de especias de arboles.Encuestemos 10,756 plantulas pertenecientes a 272 especies de arboles, observando sintomas de enfermedades a lo largo de un gradiente de precipitacion media anual en los bosques humedos tropicales de Panama Central. Cumplimos el estudio durante tres meses en la temporada de lluvias (junio-agosto) y dos meses en la siguiente temporada seca (marzo-abril). Mas del 99% de los sintomas observados fueron causados por fitopatogenos necrotrofos foliares, mientras que menos de 1% de los sintomas se atribuyeron a fitopatogenos del suelo. La incidencia de enfermedades foliares mostro una relacion inversa con la precipitacion media anual, un patron que podria deberse a una mayor susceptibilidad a enfermedades entre las especies de bosques secos.La incidencia de enfermedades foliares aumento con la densidad de plantulas conspecificos, pero no respondio a la proximidad de adultos conspecificos. Aunque la incidencia de enfermedad foliar disminuyo a medida que aumentaba la precipitacion media anual, el efecto de la dependencia de la densidad o la proximidad conspecifico fue independiente de la gradiente de precipitacion.Las plantulas de especies comunes y especies dispersadas por mamiferos no voladores tenian un riesgo mas alto de incidencia de patogenos foliares. Un aumento de enfermedades en especies comunes puede ayudar a reducir su dominancia.Sintesis. Los aumentos en la incidencia de patogenos foliares con la densidad de plantulas conspecificos, la abundancia de especies, y el mecanismo de dispersion indican que la incidencia de enfermedades foliares no es aleatoria y puede contribuir a la regulacion de comunidades vegetales tropicales y a la coexistencia de especies. Ademas, las relaciones entre la incidencia de enfermedades foliares, el mecanismo de dispersion, y precipitacion sugieran que las interacciones planta-patogenos podrian cambiar como respuesta al cambio climatico y a la alteracion de la comunidad dispersores. Foliar pathogen incidence across a mean annual precipitation gradient in Panama is non-random and may contribute to the regulation of tropical plant communities and species coexistence. Seedlings were more likely to be symptomatic of disease as conspecific seedling density increased, if they were a species that is locally abundant as adults, and if they were dispersed by non-flying mammals.image |
| 英文关键词 | foliar pathogens; Janzen-Connell hypothesis; Panama; plant-pathogen interactions; precipitation gradient; seedling disease; tropical tree diversity |
| 语种 | 英语 |
| WOS研究方向 | Plant Sciences ; Environmental Sciences & Ecology |
| WOS类目 | Plant Sciences ; Ecology |
| WOS记录号 | WOS:001144638800001 |
| 来源期刊 | JOURNAL OF ECOLOGY
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/306871 |
| 作者单位 | University of Connecticut; University of Arizona; Yale University; Smithsonian Institution; Smithsonian Tropical Research Institute |
| 推荐引用方式 GB/T 7714 | . Foliar disease incidence in a tropical seedling community is density dependent and varies along a regional precipitation gradient[J],2024,112(3). |
| APA | (2024).Foliar disease incidence in a tropical seedling community is density dependent and varies along a regional precipitation gradient.JOURNAL OF ECOLOGY,112(3). |
| MLA | "Foliar disease incidence in a tropical seedling community is density dependent and varies along a regional precipitation gradient".JOURNAL OF ECOLOGY 112.3(2024). |
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