Species Abundance
Species Abundance - Related Videos
10:34
Quantification of the Abundance and Charging Levels of Transfer RNAs in Escherichia coli
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Cited by 13 •
2017
Here we present a method for directly measuring transfer RNA charging levels from purified Escherichia coli RNA as well as a way to compare relative levels of transfer RNA, or any other short RNA, across different samples based on the addition of spike-in cells expressing a reference gene.
10:14
Species Distribution and Biogeography - Student Protocol
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2019
Simulating Colonization and Extinction on Islands ExpandForm groups of three. One member of the group will simulate colonization by throwing balls into the groups of cups representing the islands. Another will simulate extinction by rolling dice to randomly remove balls from the cups. The third group member will record the data. Take time to familiarize yourself with the four island stations. NOTE: There are two large islands with 12 cups and two small islands with 6 cups. Two of the stations...
04:04
Species Distribution and Biogeography - Concepts
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2019
Species Distribution Biogeography is the study of species distribution across geographic space and the processes that shape these distributions. This discipline is based on the assumption that each species within a location must have immigrated from another geographic area or evolved from a local species. Within each habitat, a variety of biotic and abiotic factors act on individual species to shape birth, death, immigration, and emigration rates. To avoid local extinction, the combined birth...
12:47
Chromatin Immunoprecipitation (ChIP) Protocol for Low-abundance Embryonic Samples
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Cited by 5 •
2017
Here, we describe a chromatin immunoprecipitation (ChIP) and ChIP-seq library preparation protocol to generate global epigenomic profiles from low-abundance chicken embryonic samples.
01:17
Understanding Species and Reproductive Barriers
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2026
A species is a group of organisms that interbreed and produce fertile offspring. Typically, individuals of the same species appear similar and share common characteristics due to their highly similar genomes. However, not all organisms that look alike are members of the same species. Various mechanisms keep most species discrete. While some mechanisms prevent reproductive behavior and fertilization (pre-zygotic isolation), others prevent the production of fertile offspring after mating has...
FAQs
Resource availability, predation, competition, and environmental conditions can all shift species abundance. Because these influences may differ among habitats, seasons, or experimental treatments, researchers interpret abundance as a changing community pattern rather than a fixed characteristic. Comparing standardized measurements across those contexts helps identify ecological differences and change.
Counts and relative proportions answer different comparison needs. Counts show how many individuals were recorded, whereas relative proportions show each species’ share of the community. Examining both can reveal whether a species is dominant or rare and can support comparisons of community structure across habitats, seasons, or treatments.
Competition and predation matter because they are among the ecological forces associated with shifts in abundance. Resource availability and environmental conditions can also alter those values, producing different patterns between communities or through time. Tracking these variables alongside abundance helps researchers relate observed changes to broader ecological conditions without treating one measurement as isolated.
A basic workflow begins by defining the community and selecting a standardized sampling approach. Researchers may use quadrats, transects, or capture-mark-recapture, then record species-specific counts or proportions. Repeating comparable measurements across habitats, seasons, or treatments creates data that can be compared to describe community patterns and detect ecological change.
Quadrats and transects are standardized sampling approaches, and capture-mark-recapture is another method for estimating abundance. Rather than treating the methods as interchangeable measurements without context, researchers should keep the community definition and sampling approach consistent when comparing habitats, seasons, or treatments. This consistency strengthens interpretation of differences in recorded values.
In biology and conservation, abundance data support population monitoring, biodiversity assessment, and evidence-based ecosystem management. They can reveal dominant and rare species, indicate habitat quality, and provide a way to track ecological change. These outcomes make the measurements useful both for describing present community structure and for evaluating patterns across time or locations.