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Nectar accessibility determines fitness, flower choice and abundance of hoverflies that provide natural pest control

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Nectar accessibility determines fitness, flower choice and abundance of hoverflies that provide natural pest control. / van Rijn, Paul C. J.; Wackers, Felix Leopold.

In: Journal of Applied Ecology, Vol. 53, 13.05.2016, p. 925-933.

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@article{59e59df6a958474f99590dd857edaf00,
title = "Nectar accessibility determines fitness, flower choice and abundance of hoverflies that provide natural pest control",
abstract = "SummaryIn modern agricultural landscapes, many organisms providing ecosystem services such as pollination and natural pest control are likely constrained by shortage of nectar and/or pollen required for adult nutrition. More and more flower-rich field margin strips and other habitats are created to eliminate these constraints. For most target organisms, however, it is not well known which (types of) flowers are effective in providing suitable pollen and nectar.We studied the suitability of a wide range of flowers as a food source for zoophagous hoverflies (hoverflies with predatory larvae) at five different levels: nectar accessibility (based on flower morphology), realized adult fitness, flower choice (both based on cage experiments), flower visitation and hoverfly abundance in mixed vegetation (both based on field observations).Realized survival of Episyrphus balteatus is related to effective flower depth by a sigmoid function. The critical flower depth is 1·6 mm, which is less than the proboscis size of the hoverfly. For Asteraceae, the critical floret depth is even less than 1·0 mm, which – in contrast to common knowledge – rules out most species within this family.Both flower choice in the laboratory and flower visitation rates in the field are well correlated with nectar accessibility and realized adult survival.In mixed floral vegetation, the number of zoophagous hoverflies is highly correlated with the abundance of only those flowers that have accessible nectar for these hoverflies.Synthesis and applications. This comparative study demonstrates that nectar (and not pollen) accessibility is the main driver determining flower resource suitability, flower choice and abundance of zoophagous hoverflies in arable field margins. The study identifies the limited range of plant species that can effectively support these beneficial insects. Preserving the right flowers in and around agricultural fields could enhance local populations and the pest control and pollination services they provide.",
keywords = "agro-environment schemes, conservation biological control, corolla depth, Diptera: Syrphidae, ecosystem services, extrafloral nectar, field margins, flower morphology, functional biodiversity, pollination",
author = "{van Rijn}, {Paul C. J.} and Wackers, {Felix Leopold}",
year = "2016",
month = may
day = "13",
doi = "10.1111/1365-2664.12605",
language = "English",
volume = "53",
pages = "925--933",
journal = "Journal of Applied Ecology",
issn = "0021-8901",
publisher = "Blackwell Publishing Ltd",

}

RIS

TY - JOUR

T1 - Nectar accessibility determines fitness, flower choice and abundance of hoverflies that provide natural pest control

AU - van Rijn, Paul C. J.

AU - Wackers, Felix Leopold

PY - 2016/5/13

Y1 - 2016/5/13

N2 - SummaryIn modern agricultural landscapes, many organisms providing ecosystem services such as pollination and natural pest control are likely constrained by shortage of nectar and/or pollen required for adult nutrition. More and more flower-rich field margin strips and other habitats are created to eliminate these constraints. For most target organisms, however, it is not well known which (types of) flowers are effective in providing suitable pollen and nectar.We studied the suitability of a wide range of flowers as a food source for zoophagous hoverflies (hoverflies with predatory larvae) at five different levels: nectar accessibility (based on flower morphology), realized adult fitness, flower choice (both based on cage experiments), flower visitation and hoverfly abundance in mixed vegetation (both based on field observations).Realized survival of Episyrphus balteatus is related to effective flower depth by a sigmoid function. The critical flower depth is 1·6 mm, which is less than the proboscis size of the hoverfly. For Asteraceae, the critical floret depth is even less than 1·0 mm, which – in contrast to common knowledge – rules out most species within this family.Both flower choice in the laboratory and flower visitation rates in the field are well correlated with nectar accessibility and realized adult survival.In mixed floral vegetation, the number of zoophagous hoverflies is highly correlated with the abundance of only those flowers that have accessible nectar for these hoverflies.Synthesis and applications. This comparative study demonstrates that nectar (and not pollen) accessibility is the main driver determining flower resource suitability, flower choice and abundance of zoophagous hoverflies in arable field margins. The study identifies the limited range of plant species that can effectively support these beneficial insects. Preserving the right flowers in and around agricultural fields could enhance local populations and the pest control and pollination services they provide.

AB - SummaryIn modern agricultural landscapes, many organisms providing ecosystem services such as pollination and natural pest control are likely constrained by shortage of nectar and/or pollen required for adult nutrition. More and more flower-rich field margin strips and other habitats are created to eliminate these constraints. For most target organisms, however, it is not well known which (types of) flowers are effective in providing suitable pollen and nectar.We studied the suitability of a wide range of flowers as a food source for zoophagous hoverflies (hoverflies with predatory larvae) at five different levels: nectar accessibility (based on flower morphology), realized adult fitness, flower choice (both based on cage experiments), flower visitation and hoverfly abundance in mixed vegetation (both based on field observations).Realized survival of Episyrphus balteatus is related to effective flower depth by a sigmoid function. The critical flower depth is 1·6 mm, which is less than the proboscis size of the hoverfly. For Asteraceae, the critical floret depth is even less than 1·0 mm, which – in contrast to common knowledge – rules out most species within this family.Both flower choice in the laboratory and flower visitation rates in the field are well correlated with nectar accessibility and realized adult survival.In mixed floral vegetation, the number of zoophagous hoverflies is highly correlated with the abundance of only those flowers that have accessible nectar for these hoverflies.Synthesis and applications. This comparative study demonstrates that nectar (and not pollen) accessibility is the main driver determining flower resource suitability, flower choice and abundance of zoophagous hoverflies in arable field margins. The study identifies the limited range of plant species that can effectively support these beneficial insects. Preserving the right flowers in and around agricultural fields could enhance local populations and the pest control and pollination services they provide.

KW - agro-environment schemes

KW - conservation biological control

KW - corolla depth

KW - Diptera: Syrphidae

KW - ecosystem services

KW - extrafloral nectar

KW - field margins

KW - flower morphology

KW - functional biodiversity

KW - pollination

U2 - 10.1111/1365-2664.12605

DO - 10.1111/1365-2664.12605

M3 - Journal article

VL - 53

SP - 925

EP - 933

JO - Journal of Applied Ecology

JF - Journal of Applied Ecology

SN - 0021-8901

ER -