Landscape-scale interactions of spatial and temporal cropland heterogeneity drive biological control of cereal aphids

Aliette Bosem Baillod, Teja Tscharntke, Yann Clough, Péter Batáry

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Agricultural landscapes are characterised by dynamic crop mosaics changing in composition and configuration over space and time. Although semi-natural habitat has been often shown to contribute to pest biological control, the effects of increasing landscape heterogeneity with cropland have been disregarded. Here, we examine how cereal aphids, their enemies and biological control are affected by the composition and configuration of the crop mosaic and its inter-annual change due to crop rotation. We studied the abundance of cereal aphids, natural enemies and aphid parasitism over 2 years on 51 winter wheat fields. Arthropods were monitored at three distances (0, 10, 30 m) from field borders. Fields were embedded in landscapes of 1-km diameter selected along orthogonal gradients of compositional crop heterogeneity (crop diversity), configurational heterogeneity (field border and grassy field boundary length) and inter-annual change in cover of aphid host habitats (cereal, maize and grassland). We aimed to disentangle spatial and temporal heterogeneity effects through these independent landscape gradients. Aphid densities were lower in landscapes with smaller field size (more field borders) coupled with high amounts of grassy field boundaries. Aphid densities decreased also in landscapes with higher crop diversity when the cover of aphid host habitat had decreased from the year before. Aphid natural enemy densities decreased with smaller field size and high amounts of grassy field boundaries. Aphid parasitism decreased with the inter-annual expansion in aphid host habitat, but only in landscapes with small field sizes. Synthesis and applications. Our study shows for the first time that cereal aphid numbers can be reduced by optimising the composition, configuration and temporal heterogeneity of the crop mosaic. We highlight the value of maintaining small field sizes in agricultural landscapes and high densities of grassy boundaries for reducing aphid abundance. Landscape-wide crop diversification can reduce aphid densities as well.

Original languageEnglish
Pages (from-to)1804-1813
Number of pages10
JournalJournal of Applied Ecology
Volume54
Issue number6
DOIs
Publication statusPublished - Dec 1 2017

Fingerprint

aphid
biological control
cereal
crop
field margin
habitat
natural enemy
parasitism
agricultural land
crop rotation
arthropod
wheat
grassland
maize

Keywords

  • aphid parasitism
  • crop rotation
  • edge effect
  • field margin
  • field size
  • landscape composition
  • landscape configuration
  • predator–prey ratio
  • spatial heterogeneity
  • temporal heterogeneity

ASJC Scopus subject areas

  • Ecology

Cite this

Landscape-scale interactions of spatial and temporal cropland heterogeneity drive biological control of cereal aphids. / Bosem Baillod, Aliette; Tscharntke, Teja; Clough, Yann; Batáry, Péter.

In: Journal of Applied Ecology, Vol. 54, No. 6, 01.12.2017, p. 1804-1813.

Research output: Contribution to journalArticle

@article{1317efb83d494d9f9faddab4fb66e09a,
title = "Landscape-scale interactions of spatial and temporal cropland heterogeneity drive biological control of cereal aphids",
abstract = "Agricultural landscapes are characterised by dynamic crop mosaics changing in composition and configuration over space and time. Although semi-natural habitat has been often shown to contribute to pest biological control, the effects of increasing landscape heterogeneity with cropland have been disregarded. Here, we examine how cereal aphids, their enemies and biological control are affected by the composition and configuration of the crop mosaic and its inter-annual change due to crop rotation. We studied the abundance of cereal aphids, natural enemies and aphid parasitism over 2 years on 51 winter wheat fields. Arthropods were monitored at three distances (0, 10, 30 m) from field borders. Fields were embedded in landscapes of 1-km diameter selected along orthogonal gradients of compositional crop heterogeneity (crop diversity), configurational heterogeneity (field border and grassy field boundary length) and inter-annual change in cover of aphid host habitats (cereal, maize and grassland). We aimed to disentangle spatial and temporal heterogeneity effects through these independent landscape gradients. Aphid densities were lower in landscapes with smaller field size (more field borders) coupled with high amounts of grassy field boundaries. Aphid densities decreased also in landscapes with higher crop diversity when the cover of aphid host habitat had decreased from the year before. Aphid natural enemy densities decreased with smaller field size and high amounts of grassy field boundaries. Aphid parasitism decreased with the inter-annual expansion in aphid host habitat, but only in landscapes with small field sizes. Synthesis and applications. Our study shows for the first time that cereal aphid numbers can be reduced by optimising the composition, configuration and temporal heterogeneity of the crop mosaic. We highlight the value of maintaining small field sizes in agricultural landscapes and high densities of grassy boundaries for reducing aphid abundance. Landscape-wide crop diversification can reduce aphid densities as well.",
keywords = "aphid parasitism, crop rotation, edge effect, field margin, field size, landscape composition, landscape configuration, predator–prey ratio, spatial heterogeneity, temporal heterogeneity",
author = "{Bosem Baillod}, Aliette and Teja Tscharntke and Yann Clough and P{\'e}ter Bat{\'a}ry",
year = "2017",
month = "12",
day = "1",
doi = "10.1111/1365-2664.12910",
language = "English",
volume = "54",
pages = "1804--1813",
journal = "Journal of Applied Ecology",
issn = "0021-8901",
publisher = "Wiley-Blackwell",
number = "6",

}

TY - JOUR

T1 - Landscape-scale interactions of spatial and temporal cropland heterogeneity drive biological control of cereal aphids

AU - Bosem Baillod, Aliette

AU - Tscharntke, Teja

AU - Clough, Yann

AU - Batáry, Péter

PY - 2017/12/1

Y1 - 2017/12/1

N2 - Agricultural landscapes are characterised by dynamic crop mosaics changing in composition and configuration over space and time. Although semi-natural habitat has been often shown to contribute to pest biological control, the effects of increasing landscape heterogeneity with cropland have been disregarded. Here, we examine how cereal aphids, their enemies and biological control are affected by the composition and configuration of the crop mosaic and its inter-annual change due to crop rotation. We studied the abundance of cereal aphids, natural enemies and aphid parasitism over 2 years on 51 winter wheat fields. Arthropods were monitored at three distances (0, 10, 30 m) from field borders. Fields were embedded in landscapes of 1-km diameter selected along orthogonal gradients of compositional crop heterogeneity (crop diversity), configurational heterogeneity (field border and grassy field boundary length) and inter-annual change in cover of aphid host habitats (cereal, maize and grassland). We aimed to disentangle spatial and temporal heterogeneity effects through these independent landscape gradients. Aphid densities were lower in landscapes with smaller field size (more field borders) coupled with high amounts of grassy field boundaries. Aphid densities decreased also in landscapes with higher crop diversity when the cover of aphid host habitat had decreased from the year before. Aphid natural enemy densities decreased with smaller field size and high amounts of grassy field boundaries. Aphid parasitism decreased with the inter-annual expansion in aphid host habitat, but only in landscapes with small field sizes. Synthesis and applications. Our study shows for the first time that cereal aphid numbers can be reduced by optimising the composition, configuration and temporal heterogeneity of the crop mosaic. We highlight the value of maintaining small field sizes in agricultural landscapes and high densities of grassy boundaries for reducing aphid abundance. Landscape-wide crop diversification can reduce aphid densities as well.

AB - Agricultural landscapes are characterised by dynamic crop mosaics changing in composition and configuration over space and time. Although semi-natural habitat has been often shown to contribute to pest biological control, the effects of increasing landscape heterogeneity with cropland have been disregarded. Here, we examine how cereal aphids, their enemies and biological control are affected by the composition and configuration of the crop mosaic and its inter-annual change due to crop rotation. We studied the abundance of cereal aphids, natural enemies and aphid parasitism over 2 years on 51 winter wheat fields. Arthropods were monitored at three distances (0, 10, 30 m) from field borders. Fields were embedded in landscapes of 1-km diameter selected along orthogonal gradients of compositional crop heterogeneity (crop diversity), configurational heterogeneity (field border and grassy field boundary length) and inter-annual change in cover of aphid host habitats (cereal, maize and grassland). We aimed to disentangle spatial and temporal heterogeneity effects through these independent landscape gradients. Aphid densities were lower in landscapes with smaller field size (more field borders) coupled with high amounts of grassy field boundaries. Aphid densities decreased also in landscapes with higher crop diversity when the cover of aphid host habitat had decreased from the year before. Aphid natural enemy densities decreased with smaller field size and high amounts of grassy field boundaries. Aphid parasitism decreased with the inter-annual expansion in aphid host habitat, but only in landscapes with small field sizes. Synthesis and applications. Our study shows for the first time that cereal aphid numbers can be reduced by optimising the composition, configuration and temporal heterogeneity of the crop mosaic. We highlight the value of maintaining small field sizes in agricultural landscapes and high densities of grassy boundaries for reducing aphid abundance. Landscape-wide crop diversification can reduce aphid densities as well.

KW - aphid parasitism

KW - crop rotation

KW - edge effect

KW - field margin

KW - field size

KW - landscape composition

KW - landscape configuration

KW - predator–prey ratio

KW - spatial heterogeneity

KW - temporal heterogeneity

UR - http://www.scopus.com/inward/record.url?scp=85018740493&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85018740493&partnerID=8YFLogxK

U2 - 10.1111/1365-2664.12910

DO - 10.1111/1365-2664.12910

M3 - Article

VL - 54

SP - 1804

EP - 1813

JO - Journal of Applied Ecology

JF - Journal of Applied Ecology

SN - 0021-8901

IS - 6

ER -