Do Reverse Janzen-Connell Effects Reduce Species Diversity?

Zahra, Shafia; Novotný, Vojtěch; Fayle, Tom M.

doi:10.1016/j.tree.2021.02.002

Cited by 11 publications

(9 citation statements)

References 14 publications

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“…Plants in these plots accumulate mutualists, because of their positive PSF (see Figure I in Box 1). Such positive mutualist effects can also negatively influence species diversity in species-rich communities because greater mutualist accumulation can promote the dominance of a few selective plants [76]. We still poorly understand how mutualist accumulation in high and low diverse plant communities affects respective temporal (a)synchrony in plant specific biomasses.…”

Section: Trends In Ecology and Evolutionmentioning

confidence: 99%

Plant–Soil Feedbacks and Temporal Dynamics of Plant Diversity–Productivity Relationships

Thakur

Putten

Wilschut

et al. 2021

Trends in Ecology & Evolution

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Section: Trends In Ecology and Evolutionmentioning

confidence: 99%

Plant–Soil Feedbacks and Temporal Dynamics of Plant Diversity–Productivity Relationships

Thakur

Putten

Wilschut

et al. 2021

Trends in Ecology & Evolution

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“…This has significant implications for incorporating biotic interactions into models of species' range shifts, as plant × plant competition has been hypothesized to be a substantial biotic hindrance to plant range expansion (Corlett and Westcott 2013;Lockwood et al 2013). However, given the results of these experiments, it is conceivable that the presence of native congeners in taxa that form specialized, below-ground mutualisms might ultimately provide more benefit for newly colonizing species than negative effects from interspecific competition, a dynamic that could actually favor co-existence and positive association of related species with shared mutualists (Zahra et al 2021). Exploring this tension between the indirect benefits of shared mutualists and direct plant × plant competition would require further research pairing heterospecific individuals in shared mesocosms or experimental field plots, something that was not done in the present study.…”

Section: Insights Into Community Composition and Colonizationmentioning

confidence: 99%

Of mutualism and migration: will interactions with novel ericoid mycorrhizal communities help or hinder northward Rhododendron range shifts?

et al. 2022

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Rapid climate change imperils many small-ranged endemic species as the climate envelopes of their native ranges shift poleward. In addition to abiotic changes, biotic interactions are expected to play a critical role in plant species’ responses. Below-ground interactions are of particular interest given increasing evidence of microbial effects on plant performance and the prevalence of mycorrhizal mutualisms. We used greenhouse mesocosm experiments to investigate how natural northward migration/assisted colonization of Rhododendron catawbiense, a small-ranged endemic eastern U.S. shrub, might be influenced by novel below-ground biotic interactions from soils north of its native range, particularly with ericoid mycorrhizal fungi (ERM). We compared germination, leaf size, survival, and ERM colonization rates of endemic R. catawbiense and widespread R. maximum when sown on different soil inoculum treatments: a sterilized control; a non-ERM biotic control; ERM communities from northern R. maximum populations; and ERM communities collected from the native range of R. catawbiense. Germination rates for both species when inoculated with congeners' novel soils were significantly higher than when inoculated with conspecific soils, or non-mycorrhizal controls. Mortality rates were unaffected by treatment, suggesting that the unexpected reciprocal effect of each species’ increased establishment in association with heterospecific ERM could have lasting demographic effects. Our results suggest that seedling establishment of R. catawbiense in northern regions outside its native range could be facilitated by the presence of extant congeners like R. maximum and their associated soil microbiota. These findings have direct relevance to the potential for successful poleward migration or future assisted colonization efforts.

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“…Así mismo, la riqueza de especies de pinos también es relativamente alta, representa 3.3% global (n = 120) y 8.2% para México (n = 49) (Gernandt y Pérez-de la Rosa, 2014; Price et al, 1998). Considerando la hipótesis de Janzen-Connell (Zahra et al, 2021), con relación a que las especies dominantes tienen el potencial de generar un bosque monoespecífico, pero debido a sus enemigos naturales pueden controlar su dominancia y permitir la coexistencia de otras especies de árboles, quizá la presencia de Dendroctonus y su diversidad expliquen parte de la alta riqueza de especies de pinos, fungiendo como agentes sanadores naturales del bosque (Burley, 2002;Christeansen y Bakke, 1988). Sin embargo, no se debe olvidar el impacto del cambio climático Tabla 1…”

Section: Discussionunclassified

La presencia de Dendroctonus es diferente entre especies de pinos y sus diámetros en la región del Parque Nacional Cofre de Perote, México

et al. 2022

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México tiene la mayor diversidad global de especies de pinos y poco se sabe sobre la interacción Pinus-Dendroctonus. Nuestras preguntas fueron: 1) ¿Qué especies de Dendroctonus se pueden recolectar en trampas con atrayentes generalistas en un bosque mixto de pinos? 2) ¿Es diferente la presencia de Dendroctonus entre especies de pinos y sus clases de tamaño diamétrico? 3) ¿Cuáles son los valores de importancia ecológica relativos (VIE) de las especies de pinos? A través de un muestreo con punto cuadrante, se registraron 4 especies de pinos (Pinus montezumae, P. patula, P. pseudostrobus y P. strobus) y con el uso de trampas, 4 de Dendroctonus (D. adjunctus, D. aproximatus, D. mexicanus y D. valens). Hubo diferencias significativas en el número de Dendroctonus entre categorías diamétricas y especies de pinos. La presencia de Dendroctonus fue mayor en diámetros más grandes, con excepción de P. strobus. Pinus montezumae tuvo la mayor cantidad de individuos con presencia de Dendroctonus, pero a nivel de población, P. patula tuvo la mayor proporción de individuos con Dendroctonus (29.4%). El VIE más alto fue para P. montezumae. Sugerimos, mantener monitoreo de Dendroctonus en P. montezumae y P. patula, debido a su valor económico en la región de estudio.

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Do Reverse Janzen-Connell Effects Reduce Species Diversity?

Cited by 11 publications

References 14 publications

Plant–Soil Feedbacks and Temporal Dynamics of Plant Diversity–Productivity Relationships

Plant–Soil Feedbacks and Temporal Dynamics of Plant Diversity–Productivity Relationships

Of mutualism and migration: will interactions with novel ericoid mycorrhizal communities help or hinder northward Rhododendron range shifts?

La presencia de Dendroctonus es diferente entre especies de pinos y sus diámetros en la región del Parque Nacional Cofre de Perote, México

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