Respuesta :
Answer: it's better to do a small area at a time other than doing large areas where it will be hard to find specific species throughout the huge amount of land
A quadrat is a small, designated portion of the entire area to be sampled that is marked off so that the population within it can be counted by hand or by a similar method, like by taking an aerial photograph.
Quadrat sampling provide an accurate estimate of a population size within a defined area:
Quadrats allow researchers to study plant and animal populations spread out over large areas. They are inexpensive, relatively easy to design and adaptable for studying unevenly distributed populations.
Quadrats work well for observing changes to whole populations over time, including distribution patterns, nesting and overall health.
What is Quadrat Sampling?
Quadrat sampling is a classic tool for the study of ecology, especially biodiversity. It is an important method by which organisms in a certain proportion (sample) of the habitat are counted directly.
It is used to estimate population abundance (number), density, frequency and distributions.
A quadrat is a small, designated portion of the entire area to be sampled that is marked off so that the population within it can be counted by hand or by a similar method, like by taking an aerial photograph.
Quadrat sampling methods are time-tested sampling techniques that are best suited for areas where access to a habitat is relatively easy.
Advantages:
- It sampling is easy to use and is inexpensive.
- It is suitable for studying plants, slow-moving animals and faster-moving animals with a small range.
- It requires the researcher to perform the work in the field and, without care.
- It measures abundance and needed cheap equipment.
Disadvantages:
- There exists biasness in favor of slow moving taxa.
- Collect only taxa that are present in the sampling time and not buried too deeper in sediment.
- It is a low estimate of taxonomic richness and assemblage composition.
- It is also a low detectability of among-site differences in assemblage composition.
- Some animals may experience harm if the scientist collects the population within the quadrat rather than studying it in the field.
Applications:
1. Quadrat sampling is broadly used in plant studies.
2. It is applied in ecology especially in biodiversity.
3. It is used to find the taxonomic richness of slow-moving taxa in a certain area.
4. It is the best measure of finding taxonomic richness in costal area.
5. It can be also used to evaluate the impact of weathering, trampling or erosion in an ecosystem or at a cliff or rock face.
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