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Invader-invader interactions in relation to environmental heterogeneity leads to zonation of two invasive amphipods, Dikerogammarus villosus (Sowinsky) and Gammarus tigrinus Sexton: amphipod pilot species project (AMPIS) report 6

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  • As Biological Invasions Continue
  • Interactions Occur Not Only Between Invaders And Natives
  • But Increasingly New Invaders Come Into Contact With Previous Invaders
  • Whilst This Can Lead To Species Replacements
  • Co-Existence May Occur
  • But We Lack Knowledge Of Processes Driving Such Patterns
  • Since Environmental Heterogeneity Can Determine Species Richness And Co-Existence
  • The Present Study Examines Habitat Use And Its Mediation Of The Predatory Interaction Between Invasi
  • The Ponto-Caspian Dikerogammarus Villosus And The N
  • American Gammarus Tigrinus
  • In The Dutch Lake Ijsselmeer
  • We Found Broad Segregation Of D
  • Villosus And G
  • Tigrinus By Habitat Type
  • The Former Predominating In The Boulder Zone And The Latter In The Soft Sediment
  • However
  • The Two Species Co-Exist In The Boulder Zone
  • Both On The Short And Longer Terms
  • We Used An Experimental Simulation Of Habitat Heterogeneity And Show That Both Species Utilize Crevi
  • Different Sized Holes In A Plastic Grid
  • Non-Randomly
  • These Amphipods Appear To Optimise The Use Of Holes With Respect To Their 'C-Shape' Body Size
  • When Placed Together
  • D
  • Villosus Adults Preyed On G
  • Tigrinus Adults And Juveniles
  • While G
  • Tigrinus Adults Preyed On D
  • Villosus Juveniles
  • Juveniles Were Also Predators And Both Species Were Cannibalistic
  • However
  • The Impact On G
  • Tigrinus Of The Superior Intraguild Predator
  • D
  • Villosus
  • Was Significantly Reduced Where Experimental Grids Were Present As Compared To Absent
  • This Mitigation Of Intraguild Predation Between The Two Species In Complex Habitats May Explain The
  • Ecology
  • Medicine


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