Snail Ecotype Predation Experiments in Spanish Intertidal Zone

Field tethering and laboratory predation experiments investigate size-selective predation by shore crabs (Pachygrapsus marmoratus) on two ecotypes of the marine snail Littorina saxatilis. The data support analysis of survival rates for different snail size-classes and ecotypes across upper and lower shore locations. Results quantify selection pressures favoring large size, thick shells, and late maturity in the crab ecotype.

Use Cases

• Analyze survival rates of different snail size-classes (e.g., large vs. small crab ecotype) from tethering experiments to quantify size refuge effects.
• Model predator-driven selection by correlating crab claw height measurements with predation outcomes on specific ecotypes (wave vs. crab).
• Parameterize evolutionary models using data on size-assortative mating and differential survival to explore magic trait speciation.
• Compare laboratory and field predation results for the same snail size-class across the two ecotypes to assess environmental consistency of selection.

Strengths

• Data originates from complementary field and controlled laboratory experiments, providing both ecological context and mechanistic insight.
• Explicitly quantifies selection targets, including size, shell thickness, and maturity timing, for a model speciation system.
• Results are linked to a specific predator species (Pachygrapsus marmoratus) and geographic location (Spanish intertidal shores).

Limitations

• The specific data format, row count, column structure, and sample size are not provided in the input.
• Geographic scope is limited to a specific study area in Spain, which may not represent global patterns for these species.
• Temporal coverage of the experiments is not specified, limiting analysis of seasonal or long-term trends.

Provenance

Source

Dryad digital repository.

Collection Method

Field tethering experiments and laboratory predation trials.

Freshness

Last updated in June 2020.

Geography

Intertidal shores of Spain.