Diel-periodicity

Guides

• Brachycentrus

  Grannom Caddisflies, Humpless Casemaker Caddisflies

  Brachycentrus is a genus of caddisflies in the family Brachycentridae, commonly known as grannoms or humpless casemaker caddisflies. The genus contains at least 30 described species distributed across North America and Eurasia. Larvae are aquatic filter-feeders that construct portable cases from silk and environmental materials such as sand, small stones, or plant fragments. The genus is ecologically significant as an important prey item for trout and other freshwater fish.

  Trichopteracaddisflyfilter-feederfreshwaterstreambioindicatortrout-preycase-buildingdiel-periodicityNorth-AmericaEuropeesfenvalerate-toxicitysuspended-sediment-sensitivity

• Brachycentrus americanus

  American Grammon

  Brachycentrus americanus is a species of humpless casemaker caddisfly in the family Brachycentridae. Larvae construct portable cases and are sensitive to synthetic pyrethroid insecticides, exhibiting case-abandonment behavior upon exposure. The species displays diel periodicity in activity patterns, with predominantly nocturnal filtering behavior. It is most active in July and August in western and midwestern North America.

  Trichopteracaddisflyfreshwaterfilter-feederdiel-periodicityecotoxicologycase-buildinginsecticide-sensitivity

• Palmacorixa buenoi

  Palmacorixa buenoi is a species of water boatman (family Corixidae) described by Abbott in 1913. It is an aquatic heteropteran known for producing acoustic signals, with diel periodicity patterns that differ substantially from those observed in related genera. Most aquatic heteropterans show increased acoustic activity in early evening, but P. buenoi exhibits atypical patterns in song type periodicity. The species occurs in North America, particularly in the Nearctic region excluding the Western Cordillera and Beringia.

  Corixidaewater-boatmanaquatic-insectacoustic-behaviordiel-periodicityNearctic