Plant Exclusion of a Herbivore; Crayfish Population Decline caused by an Invading Waterweed

@article{Hessen2004PlantEO,
  title={Plant Exclusion of a Herbivore; Crayfish Population Decline caused by an Invading Waterweed},
  author={Dag Olav Hessen and Jostein Skurdal and Jan E. Braathen},
  journal={Biological Invasions},
  year={2004},
  volume={6},
  pages={133-140}
}
The population of the crayfish Astacus astacus was recorded in Lake Steinsfjorden (southeast Norway) over the period 1979–1996 by studies of total catch effort (baited traps) and catch per unit effort over the season. Over the years 1979–1987, total population of exploitable crayfish (>9.5 cm) was 194,000 (±62,000 SD), and the catches were evenly distributed over the shallow areas. After 1987 there was a sudden decrease in population size, reaching a level of 92,000 (±22,000 SD) for the 10… CONTINUE READING

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