Intraguild predation and competitive displacement between Nesidiocoris tenuis and Dicyphus maroccanus, 2 biological control agents in tomato pests
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Other documents of the author: Salas Gervassio, Nadia G.; Perez-Hedo, Meritxell; Luna, María G.; Urbaneja, Alberto
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http://dx.doi.org/10.1111/1744-7917.12361 |
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Title
Intraguild predation and competitive displacement between Nesidiocoris tenuis and Dicyphus maroccanus, 2 biological control agents in tomato pestsDate
2016-07Publisher
Institute of Zoology, Chinese Academy of SciencesBibliographic citation
SALAS GERVASSIO, Nadia G.; PÉREZ HEDO, Meritxell; LUNA, María G.; URBANEJA, Alberto. ntraguild predation and competitive displacement between Nesidiocoris tenuis and Dicyphus maroccanus, 2 biological control agents in tomato pests. Insect Science (2016) online, pp. 1–9Type
info:eu-repo/semantics/articlePublisher version
http://onlinelibrary.wiley.com/doi/10.1111/1744-7917.12361/abstract;jsessionid=D ...Subject
Abstract
Dicyphus maroccanus Wagner and Nesidiocoris tenuis Reuter (Hemiptera:
Miridae) are 2 biological control agents in tomatoes. Through the crop seasons, a natural
shift in the occurrence of both mirids in favor of N. ... [+]
Dicyphus maroccanus Wagner and Nesidiocoris tenuis Reuter (Hemiptera:
Miridae) are 2 biological control agents in tomatoes. Through the crop seasons, a natural
shift in the occurrence of both mirids in favor of N. tenuis has been observed at the end of
the cropping cycle in eastern Spain. To better optimize their conservation, the reasons for
the observed change, such as intraguild interactions (IGP) or the influence of environmental
conditions, are worth elucidating. To do this, we first studied the IGP of adult females on
heterospecific nymphs in the laboratory. We next studied exploitative competition between
adults and nymphs of each species when feeding on Ephestia kueniella Zeller (Lepidoptera:
Pyralidae) eggs in the laboratory. Finally, to analyze the competitive displacement between
both mirids, we conducted a semifield experiment in which both predators were released
together. All experiments were conducted at 2 temperature regimes (20 and 25°C). Adult-
to-nymph intraguild interactions occurred only at 25 ºC at ver y low levels, showing that N.
tenuis attacked and consumed a greater proportion of heterospecific nymphs. Nesidiocoris
tenuis was a better competitor than D. maroccanus when feeding on the shared prey in the
presence of its heterospecific nymph at 25 ºC. In semifield conditions, N. tenuis showed a
competitive advantage over D. maroccanus at both temperatures. We conclude that there
is not direct interference between both species, however, N. tenuis has a greater ability to
outcompete, since it is best adapted to higher temperatures and it is able to remove food
sources for D. maroccanus. [-]
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