Intraguild interference of spiders and ladybirds in a cotton field: Evidence from their active time and aphid control efficiency

다국어 초록 (Multilingual Abstract)

In field crop systems, biocontrol efficiency supported by various predators is not always enhanced with occurring simultaneously but can be reduced by predator interference, i.e., competition between predator individuals over access to their prey. Such interference may be related to the active time of each predator. In this study, predator exclusion experiments were used to selectively exclude either one or both predators and to examine the impact of the two predator groups on the suppression of cotton aphid (Aphis gossypii Glover) populations in a cotton field. Main predator species included Propylaea japonica (Thunberg) and Harmonia axyridis Pallas in the ladybird group, and Lycosa spp. and Erigone spp in the spider group. A greater number of spiders was observed in the morning and evening, while ladybird densities did not vary during the day. Removing all predators led to an increase in aphid numbers compared to the other treatments where predators were present. Removing either spiders or ladybirds had similar impacts on aphid control. It is likely that spiders provide an equal level of aphid mortality as ladybirds. When both spiders and ladybirds were present, aphid abundance did not differ from those treatments where only one predator group was present. The presence of both predators did not lead to more aphid suppression, indicating that interference between these predators may have occurred in the cotton field. Although these two predators partly diverged in their activity rhythms, interference may still have occurred and could be common in cotton fields.

참고문헌 (Reference)

1 World Spider Catalog, "World Spider Catalog. Version 18.5"

2 Costamagna AC, "The role of natural enemy guilds in Aphis glycines suppression" 45 : 368-379, 2008

3 Freier B, "The potential of predators in natural control of aphids in wheat : Results of a ten-year field study in two German landscapes" 52 : 775-788, 2007

4 Wade MR, "Temporal variation in arthropod sampling effectiveness : the case for using the beat sheet method in cotton" 120 : 139-153, 2006

5 R Core Team, "R:A Language and Environment for Statistical Computing computer program, version By R Core Team"

6 Costamagna AC, "Quantifying predation on soybean aphid through direct field observations" 42 : 16-24, 2007

7 Snyder WE, "Predator biodiversity strengthens herbivore suppression" 9 : 789-796, 2006

8 Shrestha RB, "Potential cotton aphid, Aphis gossypii, population suppression by arthropod predators in upland cotton" 20 : 778-788, 2013

9 Barton BT, "Opposite effects of daytime and nighttime warming on top-down control of plant diversity" 99 : 13-20, 2018

10 Gardiner MM, "Landscape diversity enhances biological control of an introduced crop pest in the north-central USA" 19 : 143-154, 2009

11 Harwood JD, "Invertebrate biodiversity affects predator fitness and hence potential to control pests in crops" 51 : 499-506, 2009

12 Lang A, "Intraguild interference and biocontrol effects of generalist predators in a winter wheat field" 134 : 144-153, 2003

13 Bastola A, "Intercrop movement of convergent lady beetle, Hippodamia convergens(Coleoptera : Coccinellidae), between adjacent cotton and alfalfa" 23 : 145-156, 2016

14 Han P, "Identification of Top-Down Forces Regulating Cotton Aphid Population Growth in Transgenic Bt Cotton in Central China" 9 : e102980-, 2014

15 Snyder WE, "Give predators a complement : Conserving natural enemy biodiversity to improve biocontrol" 135 : 73-82, 2019

16 Arshad M, "Field evaluation of water plant extracts on sucking insect pests and their associated predators in transgenic Bt cotton" 29 : 39-, 2019

17 Hagler JR, "Evidence of intraguild predation on a key member of the cotton predator complex" 4 : 8-13, 2015

18 Birkhofer K, "Cursorial spiders retard initial aphid population growth at low densities in winter wheat" 98 : 249-255, 2008

19 Nyffeler M, "Composition, abundance and pest control potential of spider communities in agroecosystems : a comparison of European and US studies" 95 : 579-612, 2003

20 Rancourt B, "Circadian activity of Lygus lineolaris(Hemiptera : Miridae)and effectiveness of sampling techniques in strawberry fields" 93 : 1160-1166, 2000

21 Zhang L, "Chromosome-level genome assembly of the predator Propylea japonica to understand its tolerance to insecticides and high temperatures" 20 : 292-307, 2020

22 Luo S, "Biological control of cotton pests in China" 68 : 6-14, 2014

23 Michalko R, "An updated perspective on spiders as generalist predators in biological control" 189 : 21-36, 2019

24 Evans EW, "Aggregation of polyphagous predators in response to multiple prey : ladybirds(Coleoptera : Coccinellidae)foraging in alfalfa" 49 : 29-36, 2007

25 Ives AR, "A synthesis of subdisciplines : predator–prey interactions, and biodiversity and ecosystem functioning" 8 : 102-116, 2005