Description
Calculate a supplied species count share within an assemblage.
Biodiversity records distinguish surveyed sites, nondetection, counts, sampling units, voucher references and source-qualified taxonomic states. A coordinate-precision label changes metadata rather than protecting a location. Relative abundance and mean count per represented unit depend on their supplied denominators and survey scope.
Calculate a supplied species count share within an assemblage.
When to use this tool
Use Species Relative Abundance Share when you already have speciesCount, assemblageCount and need to calculate a supplied species count share within an assemblage.
How to use the tool and how it works
- Enter speciesCount, assemblageCount. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read relativeAbundance. Use the output convention below.
Require a positive safe assemblage count and a safe species count in [0,assemblageCount]; divide species by assemblage.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| speciesCount | Species Count | Required. Safe integer; minimum 0. |
| assemblageCount | Assemblage Count | Required. Safe integer; minimum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| relativeAbundance | Relative Abundance | Required. Finite number. |
{
"input": {
"speciesCount": 15,
"assemblageCount": 60
},
"output": {
"relativeAbundance": 0.25
}
}Limitations and assumptions
- Counts must describe the same sampling scope and abundance basis. No detection correction, diversity metric or unobserved abundance is inferred.
- 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
Review specimens, original observations, sampling design and controlled taxonomic sources. Use complete detection, population and spatial methods when a local count fraction, source label or precision bin cannot answer the ecological or disclosure question.
References
Similar or alternative tools
- Biodiversity Sampling Unit Count Term
Calculate supplied observed count per represented sampling unit.
- Plot Detection Opportunity
Calculate a supplied completed-visit opportunity fraction.