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Related Concept Videos

Distribution and Dispersion00:54

Distribution and Dispersion

Ecology is the study of how organisms interact with their environment and with one another. An important aspect of ecology is understanding where species are found and how individuals are distributed within those areas. The geographic range of a species refers to the total area where its members are located, while dispersion describes the pattern of spacing of individuals within that range.Geographic Range and Dispersion PatternsWithin a species’ geographic range, individuals may be distributed...

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Spotted Lanternfly (Hemiptera: Fulgoridae) Nymphal Dispersion Patterns and Their Influence on Field Experiments.

D D Calvin1, J Keller2, J Rost3

  • 1Office of the Dean, The Pennsylvania State University, University Park, PA 16802, USA.

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Spotted lanternfly nymphs exhibit aggregated dispersion patterns across habitats. In situ counts are a cost-effective alternative to sticky traps for monitoring this invasive pest.

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Area of Science:

  • Entomology
  • Invasive Species Ecology
  • Pest Management

Background:

  • The spotted lanternfly (Lycorma delicatula) is a significant invasive pest in the Mid-Atlantic, USA.
  • Understanding its dispersion is crucial for effective management and surveillance strategies.

Purpose of the Study:

  • To quantify spotted lanternfly nymph dispersion patterns by instar in different habitats.
  • To compare the efficiency of sticky traps versus in situ visual counts for population density estimation.
  • To assess the effectiveness of experimental designs in detecting management impacts.

Main Methods:

  • Dispersion patterns were analyzed by nymphal instar in rural and urban/suburban settings.
  • Sticky traps and in situ visual counts were compared for population density estimation accuracy and resource requirements.
  • Completely random and randomized complete block designs were evaluated for statistical power.

Main Results:

  • All spotted lanternfly instars generally displayed aggregated dispersion patterns.
  • Sticky traps and in situ counts showed similar sample size and time requirements, with in situ counts offering advantages in cost and immediate application.
  • Randomized complete block designs provided higher statistical power for detecting treatment impacts compared to completely random designs.

Conclusions:

  • In situ visual counts present a viable, potentially more cost-effective method for monitoring spotted lanternfly populations than sticky traps, especially considering early instars' detectability challenges.
  • Randomized complete block designs are recommended for studies evaluating management practices to enhance the detection of treatment effects.
  • Evaluating treatments with less than 60% reduction requires careful consideration of the substantial sample sizes needed.