Recuperación del pastizal natural en un bosque nativo degradado del Espinal argentino mediante el control químico aéreo de arbustivas

Sabattini, Julián Alberto; Sabattini, Rafael Alberto; Omar, Alicia; Bacigalupo, M.; Cian, Juan C.; Sabattini, Iván A.; Dopazo, V. M.

doi:10.18004/investig.agrar.2019.diciembre.93-107

Cited by 4 publications

(6 citation statements)

References 25 publications

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“…Although grass-cutting ants have been traditionally seen as a pest of livestock production, our results show that the economic impacts of Atta grass-cutting ants are less important than what is commonly assumed. Although Atta is repeatedly cited as a grasscutter (36,44), our work shows that A. vollenweideri also cuts dicotyledonous leaves from shrubs and trees. In addition, results show that ant preferences for a specific functional group change throughout the year, with grass consumption greater in autumn but less representative in spring.…”

Section: Discussionmentioning

confidence: 58%

“…Only the quadrants falling entirely inside the areas were considered, making a total of 15,624 ha, in which nest density was estimated. Aerial localization of Atta nests has been used previously with both aerial photography (33,34) and satellite imagery (35); the first studies of this kind were, in fact, carried out with A. vollenweideri in Paraguay (7,36).…”

Section: Landscape Level Density Of Nestsmentioning

confidence: 99%

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Herbivory by Atta vollenweideri: Reviewing the significance of grass-cutting ants as a pest of livestock

Sabattini

Bollazzi

2023

Front. Insect Sci.

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The grass-cutting ant Atta vollenweideri is well suited for studies examining the negative effect leaf-cutting ants have on livestock production in South American grasslands because they forage on the same plants as cattle. This study investigated the impact of A. vollenweideri on livestock production in Argentinean rangelands. First, we assessed A. vollenweideri herbivory rates and its economic injury level (EIL). Second, using satellite imagery in a region covering 15,000 ha, we estimated the percentage of this area that surpassed the calculated EIL. Results showed that A. vollenweideri consumed approximately 276 kg of dry plant weight/ha/year, foraging mostly on grasses (70%). Additionally, ants cut 25% of herbs and 5% of trees. In summer and autumn, ants consumed more grasses, while in winter and spring, herbs and trees were also significantly cut. Ants consumed 7% of the forage demand needed to raise a calf according to the management regime applied by farmers. Our calculated EIL (5.85 nests/ha) falls in the range of previous studies. Colonies were absent in 93.6% of the surveyed area, while their density was below the EIL in 6.2% of the area. A. vollenweideri populations surpassed the EIL in only 0.2% of the area, which corresponds to 2.6% of the locations holding colonies. These results question the perception that Atta leaf-cutting ants are a pest of livestock production. Although ants consume a small percentage of cattle’s forage demand, evidence that ants and cattle are competing in the few cases in which density surpasses the EIL is arguable. First, grass-cutting ants are capable of consuming herbs and trees in addition to the grasses on which cattle mostly feed. Second, there is no evidence indicating that both are cutting the same plant portions when preferences overlap. Third, evidence suggests that ants are not displaced under high-pressure grazing regimes by cattle. In the countries where A. vollenweideri is present, decision makers have promulgated several acts making its control mandatory. It is time to revisit the pest status of A. vollenweideri and include the use of EIL as a control criterion.

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Section: Discussionmentioning

confidence: 58%

Section: Landscape Level Density Of Nestsmentioning

confidence: 99%

Herbivory by Atta vollenweideri: Reviewing the significance of grass-cutting ants as a pest of livestock

Sabattini

Bollazzi

2023

Front. Insect Sci.

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“…In this region, studies that have not yet been published for the province of Entre Ríos are showing indications of changes in the productivity of natural grasslands in native forests. Recently reports show that change the growth cycle has change in this ecosystem [67,68], and mainly attributed to changes in precipitation regimes. These observations are like yields changes of the main crops, were the frequency of extreme weather events constitutes a growing risk.…”

Section: Results Of Change Point Detection Analysis and Trends Of Rainfall For All Localitiesmentioning

confidence: 99%

Rainfall Trends in Humid Temperate Climate in South America: Possible Effects in Ecosystems of Espinal Ecoregion

Sabattini¹,

Sabattini²

2022

The Nature, Causes, Effects and Mitigation of Climate Change on the Environment

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In central Argentina, the annual rainfall regime shows increasing since the 2nd half of the 20th century. The aim of this work was to evaluate the long-term changes in the intensity of rainfall in the central-north region of Entre Ríos between 1945 and 2019, based only on daily precipitation records aggregated at yearly, monthly and seasonal levels. We used monthly rainfall data for the period 1945–2019 from 6 localities in Province of Entre Rios, Argentina. The change detection analysis has been conceded using Pettitt’s test, von Neumann ratio test, Buishand’s range test and standard normal homogeneity (SNH) test, while non-parametric tests including linear regression, Mann-Kendall and Spearman rho tests have been applied for trend analysis. Like the regional results, this study observed a sustained increase in monthly rainfall to the breaking point in the 1970s, but then the annual rate of increase was even higher. The average annual rainfall in the region prior to that date was 946 mm, while after the same 1150 mm, equivalent to 21.5% higher than the 1945–1977 average and 8.5% higher according to the historical average 1945–2019.

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“…Cabe destacar que la supervivencia de tala se vio afectada por la aplicación cercana de glifosato y 2, 4 D. El glifosato (N-fosfonometilglicina) es un herbicida sistémico de amplio espectro utilizado para la eliminación de hierbas, arbustos y existen antecedentes de daño a especies arbóreas (Benbrook, 2016;da Silva Ramos et al, 2020). Por otro lado, el 2, 4-D (ácido 2, 4-diclorofenoxiacético) es una auxina sintética que es utilizada como herbicida de plantas dicotiledóneas tanto herbáceas como leñosas (Song, 2014;Sabattini et al, 2019). La tolerancia de las especies a la aplicación del glifosato parece estar relacionada con una absorción diferencial a través de las hojas, por lo cual el tala podría presentar mayor susceptibilidad que el algarrobo al poseer mayor área foliar (Zeballos et al, 2014).…”

Section: Discussionunclassified

Reforestar en áreas agrícola-ganaderas: un estudio de caso evaluando el desempeño de dos especies nativas del Espinal

Cappri

Torres

Estrabou

2020

Bol. Soc. Argent. Bot.

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Introducción y objetivos: La restauración de bosques es un tema de interés creciente, especialmente en zonas agrícola-ganaderas donde los parches remanentes de bosque nativo son escasos. Evaluamos el desempeño de plantines de dos especies arbóreas nativas del Espinal. Nos propusimos (1) comparar la supervivencia y el crecimiento de plantines de Prosopis alba (algarrobo blanco) y Celtis ehrenbergiana (tala) plantados en un sitio al borde del bosque y en un sitio abierto, (2) comparar la incidencia de herbívoros entre especies y sitios, (3) describir otros factores ambientales que pudieran afectar el desempeño de los plantines en el contexto agrícola-ganadero. M&M: Plantamos 200 plantines por especie, distribuidos en los dos sitios y evaluamos mensualmente la supervivencia, altura e incidencia de herbívoros. Resultados: A los 11 meses, la supervivencia de algarrobo y tala fue de 32% y 17%, respectivamente (P<0,0001). El algarrobo tuvo mayor supervivencia en el borde del bosque mientras el tala tuvo mayor supervivencia en el sitio abierto (interacción sitio x especie, P<0,0001). La altura final fue menor que al momento de la plantación, sin diferencias entre especies ni sitios (P>0,05). Los herbívoros vertebrados afectaron al 28% de los plantines de ambas especies, mientras que los invertebrados afectaron en promedio un 5% de los plantines. Durante el experimento la plantación fue afectada por la deriva de herbicidas. Conclusiones: Recomendamos la plantación de algarrobo para extender parches de bosque remanentes y de tala para la creación de nuevos parches en sitios abiertos o incrementar conexión entre parches aislados, con exclusión ganadera y en sitios que estén protegidos de la deriva de herbicidas.

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Recuperación del pastizal natural en un bosque nativo degradado del Espinal argentino mediante el control químico aéreo de arbustivas

Cited by 4 publications

References 25 publications

Herbivory by Atta vollenweideri: Reviewing the significance of grass-cutting ants as a pest of livestock

Herbivory by Atta vollenweideri: Reviewing the significance of grass-cutting ants as a pest of livestock

Rainfall Trends in Humid Temperate Climate in South America: Possible Effects in Ecosystems of Espinal Ecoregion

Reforestar en áreas agrícola-ganaderas: un estudio de caso evaluando el desempeño de dos especies nativas del Espinal

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