Description
Return predators/prey and (predators/predatorEffort)/(prey/preyEffort).
Ecological observation summaries depend on sampling effort, eligible time, classified counts and missingness policies. Flower-minutes, area-days and observed proportions have different denominators. Observation support is distinct from true abundance, detection probability or a causal biological-control effect.
Return predators/prey and (predators/predatorEffort)/(prey/preyEffort).
When to use this tool
Use Predator Prey Sample Count Ratio when checking the stated observation support, exposure, sample or seasonal-gap convention.
How to use the tool and how it works
- Enter predators, prey, predatorEffort, preyEffort. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read rawRatio, effortAdjustedRatio. Use the output convention below.
Require whole predators>=0, whole prey>=1 and positive efforts. Return predators/prey and (predators/predatorEffort)/(prey/preyEffort).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| predators | Predators | Required. Safe integer; minimum 0. |
| prey | Prey | Required. Safe integer; minimum 1. |
| predatorEffort | Predator Effort | Required. Finite number; strictly above 0. |
| preyEffort | Prey Effort | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| rawRatio | Raw Ratio | Required. Finite number. |
| effortAdjustedRatio | Predator count per predator effort divided by prey count per prey effort. | Required. Finite number. |
{
"input": {
"predators": 20,
"prey": 100,
"predatorEffort": 2,
"preyEffort": 4
},
"output": {
"rawRatio": 0.2,
"effortAdjustedRatio": 0.4
}
}Limitations and assumptions
- Effort units must be comparable; corrected observed counts do not determine true abundance or a biological control effect.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use verified representative field records and suitable sampling/detection analysis for ecological inference, uncertainty and management.
References
Similar or alternative tools
- Mixed Crop Plant Density Relative Term
Return observedPlants/area and that density divided by the sole-crop reference.
- Biological Control Observed Parasitism Share
Select denominator examined or examined-unresolved, require it positive, and return parasitized/denominator.