Winter establishment of the alien annual Schismus barbatus is not affected by insect herbivory in Northern-Central Monte Desert

Pucheta, Eduardo; García-Muro, V.J.; Quevedo-Robledo, L.; Rolhauser, Andrés G.

doi:10.1016/j.jaridenv.2011.11.018

Cited by 2 publications

(2 citation statements)

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“…Processes that shape the spatial distribution of seedlings and determine seedling recruitment include competition, seed predation, and herbivory (Zimmerman et al 2000, Cabin et al 2002. In Andean highlands, ants and small and medium rodents are important seed consumers (Yensen & Tarifa 2002) and they can reduce the pool of seeds dispersed in the ground, particularly under large trees (Ribas-Fern andez et al 2009, Pucheta et al 2012. First, the density and distribution of seedlings of P. tomentella were heterogeneous and in some instances high densities of seedlings were found under large trees, which could suggest localized seed dispersal and that seedlings will engage in competition with nearest neighbors for resources (Torres et al 2008).…”

Section: Discussionmentioning

confidence: 99%

“…Second, seed predators could potentially decrease seed abundance (Roth et al 2009). In Andean highlands, ants and small and medium rodents are important seed consumers (Yensen & Tarifa 2002) and they can reduce the pool of seeds dispersed in the ground, particularly under large trees (Ribas-Fern andez et al 2009, Pucheta et al 2012. Finally, generalist native (e.g., ants, beetles, and rodents) and exotic herbivores (e.g., European hare, sheep, and goats) could be major agents of seedling mortality (Flores et al 2004).…”

Section: Discussionmentioning

confidence: 99%

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Small‐scale Farming and Grazing Reduce Regeneration of Polylepis tomentella (Rosaceae) in the Semiarid Andes of Bolivia

2013

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In the Andean highlands, Polylepis woodlands are a rare and unique ecosystem of the treeline. Although human activities have caused the loss of extensive forested areas and decreased woodland regeneration, few systematic and quantitative assessments have been carried out in Polylepis forests. This study compares differences in habitat characteristics, population structure, and reproductive output in populations of Polylepis tomentella subject to different levels of human disturbance in the south-central Andes of Bolivia. We selected P. tomentella because the species still covers large extensions in the form of fragmented forest patches. Results show that human activities affected all the studied populations. Moderately disturbed populations exhibited a lower percentage of farmed area (0.6%) and browsed plants (4%) than strongly disturbed populations (5% and 12%, respectively). All populations exhibited similar proportion of plants with logging scars. Potassium content and canopy closure were 1.5 and 2.5 higher, respectively, in strongly disturbed populations. The density of saplings and seedlings were 75 percent and 80 percent lower in strongly disturbed populations than in moderately disturbed population, even though reproductive individuals produced twice more flowers and fruits. Our results suggest that fruit production does not limit regeneration of P. tomentella and post-dispersal mechanisms may decrease seed germination and increase seedling mortality. Overall, strongly disturbed populations will be less likely to regenerate, leading to population decline. Conservation programs should facilitate forest recovery by promoting seedling establishment, reducing overharvesting and over-browsing, and protecting remaining adult plants.Abstract in Spanish is available in the online version of this article.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Small‐scale Farming and Grazing Reduce Regeneration of Polylepis tomentella (Rosaceae) in the Semiarid Andes of Bolivia

2013

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Host influence on life history traits of Ceratitis capitata Wiedemann in an arid region of Argentina

Rodriguez,

Jofré Barud,

Gómez

et al. 2024

Bull. Entomol. Res.

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The fruit fly Ceratitis capitata is a successful generalist due to the trade-off between different variables in its life history traits. The present study aimed to assess some life history traits of C. capitata recovered from peach, plum and fig, three key host species, under the climatic conditions of an irrigation oasis in the arid province of San Juan, Argentina. Pupal abundance, sex ratio and morphometric parameters such as pupal and adult weight, pupal volume, wingspan and head-caudal length were influenced by the host in which the larvae were reared. Sexual maturity, measured as the peak of calling (pheromone emission), was homogeneous on the sixth and seventh days after emergence, but males recovered from fig showed early calling activity on the third day after emergence. The plasticity of C. capitata to adapt its life history traits to specific nutrient variations within the larval environment allows it to colonise and establish populations where key hosts, as those studied here, are available. The knowledge of the interactions between host fruit trees and C. capitata populations provides helpful information for planning the management of local orchards and urban fruit plantations within irrigation oases, taking into consideration the concept of key hosts as peach and fig.

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Winter establishment of the alien annual Schismus barbatus is not affected by insect herbivory in Northern-Central Monte Desert

Cited by 2 publications

References 15 publications

Small‐scale Farming and Grazing Reduce Regeneration of Polylepis tomentella (Rosaceae) in the Semiarid Andes of Bolivia

Small‐scale Farming and Grazing Reduce Regeneration of Polylepis tomentella (Rosaceae) in the Semiarid Andes of Bolivia

Host influence on life history traits of Ceratitis capitata Wiedemann in an arid region of Argentina

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