Composition of tropical agricultural landscape alters the structure of host-parasitoid food webs

Syahidah, Tazkiyatul; Rizali, Akhmad; Prasetyo, Lilik Budi; Pudjianto,; Buchori, Damayanti

doi:10.1016/j.heliyon.2021.e07625

Cited by 3 publications

(2 citation statements)

References 29 publications

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“…The differences in geographical regions suggest that habitat conditions, both at the field scale and landscape scale, may contribute to shaping the host-parasitoid interaction in oil palm plantations. Therefore, findings from other agroecosystems in different geographical regions, which suggest that agricultural landscape composition can affect host-parasitoid food webs [ 48 , 49 ], may also apply here. This suggests that managing oil palm plantations at a landscape scale can reduce the long-term effect of the monoculture system on biological control services.…”

Section: Discussionmentioning

confidence: 86%

“…It means that each region has its environmental characteristics that shape the communities of pests and parasitoids in oil palm plantations. For instance, landscape characteristics also affect the structure of plant-insect food webs [ 48 , 49 ] as a consequence of the spill-over of natural enemies between the agroecosystem and natural ecosystem in the surrounding agroecosystem [ 50 ]. In Central Kalimantan, some remaining forests still exist surrounding plots of oil palm fields, while in Jambi, the plots of oil palm fields were located nearby other oil palm plantations or rubber plantations.…”

Section: Discussionmentioning

confidence: 99%

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Long-term changes as oil palm plantation age simplify the structure of host-parasitoid food webs

Rizali,

Karindah,

Ainy

et al. 2023

PLoS ONE

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Understanding host-parasitoid food webs, as well as the factors affecting species interactions, is important for developing pest management strategies in an agroecosystem. This research aimed to study how the long-term change in oil palm plantations, specifically the tree age, affect the structure of host-parasitoid food webs. The field research was conducted on an oil palm plantation located in Central Kalimantan and Jambi Province, Indonesia. In Central Kalimantan, we conducted observations of lepidopteran larvae and parasitoid wasps at different tree ages, ranging from 3 to 18 years old. For tree ages from 3 to 10 years, observations of host-parasitoid food webs were conducted by collecting the lepidopteran larvae using a hand-collection method in each oil palm tree within a hundred trees and they were later reared in the laboratory for observing the emerging parasitoids. The fogging method was applied for trees aged 12 to 18 years because the tree height was too high, and hand-collection was difficult to perform. To compare host-parasitoid food webs between different regions, we also conducted a hand-collection method in Jambi, but only for trees aged 3 years old. The food-web structure that was analyzed included the species number of lepidopteran larvae and parasitoid wasps, linkage density, and interaction diversity. We found 32 species of lepidopteran pests and 16 species of associated parasitoids in Central Kalimantan and 12 species of lepidopteran pests, and 11 species of parasitoids in Jambi. Based on the GLM analysis, tree age had a negative relationship with the species number of lepidopteran larvae and parasitoids as well as linkage density and interaction diversity. Different geographical regions showed different host-parasitoid food web structures, especially the species number of lepidopteran larvae and interaction diversity, which were higher in Central Kalimantan than in Jambi. However, some parasitoids can be found across different tree ages. For example, Fornicia sp (Hymenoptera: Braconidae) was recorded in all ages of oil palm sampled. Results of the GLM analysis showed that the abundance of Fornicia sp and its host (lepidopteran larvae abundance) were not affected by the tree age of the oil palm. In conclusion, the long-term change in oil palm plantations simplifies the structure of host-parasitoid food webs. This highlights the importance of long-term studies across geographical regions for a better understanding of the consequences that wide monoculture oil palm plantations have on biological control services.

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Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Long-term changes as oil palm plantation age simplify the structure of host-parasitoid food webs

Rizali,

Karindah,

Ainy

et al. 2023

PLoS ONE

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A multi-scale approach to study palm-weevils in a tropical agroecosystem

Vásquez-Ordóñez,

Torres-López,

Monmany-Garzia

2024

Landsc Ecol

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Context The recent phytosanitary crisis caused by the stem borer weevils Dynamis borassi and Rhynchophorus palmarum in peach palms (Bactris gasipaes) seriously affects the economy of rural families in Colombia. To understand the possible ecological mechanisms favoring the pest, the weevil-palm system needs to be studied from a multi-scale perspective. Objectives We evaluated the combined effects of agricultural management, landscape, topography, soil, and climate variables on infestation levels of peach palm caused by the weevils D. borassi and R. palmarum in the Colombian southwest to understand underlying ecological drivers of the current phytosanitary crisis. Methods The palm infestation levels (response variable) and local agronomic practices were recorded in 32 sites across Colombia's Pacific, Andes, and Amazon natural regions. For each peach palm crop, landscape variables were estimated from classified Sentinel-2 images, soil variables were extracted from the Soil Grids 250 m database, and climate variables were extracted from the CHIRPS and CHIRTS databases. Explanatory variables were analyzed using Generalized Linear Models and Partial Least Squares-Generalized Linear Models. Results Landscape variables, specifically the number and shape of non-forest patches, had a greater influence on peach palm infestation levels than other environmental variables, possibly related to the decrease in the density of Oenocarpus batatua, the natural palm host for D. borassi, leading it to switch to the peach palm. Conclusions A multi-scale approach of the weevil-palm interaction enabled us to identify an ecological mechanism that has not been proposed before. Our recommendation for families depending on peach palm is to design palm management with a landscape perspective that considers the conservation of alternative hosts for the weevils in agroforestal plots.

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A multi-scale approach to study palm-weevils in a tropical agroecosystem

Vásquez-Ordóñez

Torres-López

Monmany-Garzia

2023

Preprint

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Context The recent phytosanitary crisis caused by the stem borer weevils Dynamis borassi and Rhynchophorus palmarum in peach palms (Bactris gasipaes) seriously affected the economy of local families in Colombia. To understand the possible ecological mechanisms favoring the pest, the weevil-palm system needs to be studied from a multi-scale perspective. Objectives We evaluated the combined effects of agricultural management, landscape, topography, soil, and climate variables on infestation levels of peach palm caused by the weevils D. borassi and R. palmarumin the Colombian southwest to understand underlying ecological drivers of the current phytosanitary crisis. Methods The palm infestation levels (response variable) and local agronomic practices were recorded in 32 sites across Colombia's Pacific, Andes, and Amazon natural regions. For each peach palm crop, landscape variables were estimated from classified Sentinel-2 images, soil variables were extracted from the Soil Grids 250 m database, and climate variables were extracted from the CHIRPS and CHIRTS databases. Explanatory variables were analyzed using Generalized Linear Models and Partial Least Squares-Generalized Linear Models. Results Landscape variables, specifically the number and shape of non-forest patches, had a greater influence on peach palm infestation levels than other environmental variables, possibly related to the decrease in the density of Oenocarpus batatua, the natural palm host for D. borassi, leading it to switch to the peach palm. Conclusions A multi-scale approach of the weevil-palm interaction enabled us to identify an ecological mechanism that has not been proposed before. Our recommendation for families depending on the palm is to design palm management with a landscape perspective that considers the conservation of alternative hosts for the weevils in agroforestal plots.

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Composition of tropical agricultural landscape alters the structure of host-parasitoid food webs

Cited by 3 publications

References 29 publications

Long-term changes as oil palm plantation age simplify the structure of host-parasitoid food webs

Long-term changes as oil palm plantation age simplify the structure of host-parasitoid food webs

A multi-scale approach to study palm-weevils in a tropical agroecosystem

A multi-scale approach to study palm-weevils in a tropical agroecosystem

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