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Journal of Chemical Ecology

, Volume 20, Issue 1, pp 153–170 | Cite as

Pheromonal secretions from glands on the 5th abdominal sternite of hydropsychid and rhyacophilid caddisflies (Trichoptera)

  • Christer Löfstedt
  • Bill S. Hansson
  • Erik Petersson
  • Peter Valeur
  • Andrew Richards
Article

Abstract

Extracts of different body parts of adult Trichoptera were tested for electrophysiological activity. Extracts of the IVth and Vth abdominal sternites of femaleHydropsyche angustipennis, Rhyacophila nubila, andR. fasciata, containing a paired exocrine gland, elicited significant electroan-tennographic responses when tested on conspecific male antennae. The paired gland occurs also in males of all the species, and inH. angustipennis, extracts from males were more active than female extracts when tested on male antennae. Female and male extracts from all species were analyzed by gas chromatography with simultaneous flame ionization and electroantennographic detection (EAD). EAD-active peaks in female extracts, stimulating male antennae, were identified inH. angustipennis as nonan-2-one; and inR. nubila andR. fasciata as heptan-2-one, heptan-2-ol, nonan-2-one, and nonan-2-ol. EAD-active components from maleH. angustipennis stimulating male antennae were octan-2-one, nonan-2-one (major peak), (Z)-6-nonen-2-one, decan-2-one, and a methylbranched decan-2-one. Female extracts and synthetic mixtures of compounds identified from femaleH. angustipennis andR. fasciata were tested for attractivity in the field. High catches with control traps obscured the results, but a synthetic mixture of the four identified compounds was significantly attractive and not different from female extracts for attracting maleR. fasciata. InH. angustipennis, a synthetic six-component male blend, in which nonan-2-one was the major component, attracted significant numbers of male and femaleH. angustipennis. Extracts of maleR. nubila andR. fasciata contained acetophenone and hexanoic and octanoic acids but did not have any electrophysiological or behavioral activity on either male or female antennae of conspecifics. The occurrence of a female sex pheromone inRhyacophila and an aggregation pheromone inHydropsyche corresponds to earlier described differences in mating behaviors in the Rhyacophilidae and Hydropsychidae.

Key Words

Trichoptera Rhyacophilidae sex pheromone aggregation pheromone Rhyacophila nubila Rhyacophila fasciata Hydropsyche angustipennis electroantennogram heptan-2-one octan-2-one nonan-2-one decan-2-one (Z)-6-nonen-2-one heptan-2-ol nonan-2-ol GC-EAD swarming 

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Copyright information

© Plenum Publishing Corporation 1994

Authors and Affiliations

  • Christer Löfstedt
    • 1
  • Bill S. Hansson
    • 1
  • Erik Petersson
    • 2
  • Peter Valeur
    • 1
  • Andrew Richards
    • 1
  1. 1.Department of EcologyLund UniversityLundSweden
  2. 2.Department of ZoologyUppsala UniversityUppsalaSweden

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