Transect: Difference between revisions
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{{short description|Path along which the observer counts and records occurrences of the subjects of the survey}} |
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{{For|the urban planning approach|Transect (urban)}} |
{{For|the urban planning approach|Transect (urban)}} |
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[[File:Ed Williams measuring a transect (9664326339).jpg|thumb|A transect running across a stream.]] |
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A '''transect''' is a path along which one counts and records occurrences of the objects of study (e.g. plants).{{cn|date=November 2019}} |
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A '''transect''' is a path along which one counts and records occurrences of the species of study (e.g. plants).<ref>{{Cite journal |author=Angelo Mark P. Walag |author2=Mae Oljae P. Canencia |title = Physico-chemical Parameters and Macrobenthic Invertebrates of the Intertidal Zone of Gusa, Cagayan de Oro City, Philippines |journal=Advances in Environmental Sciences - International Journal of the Bioflux Society |year=2016 |volume=8 |issue=1 |pages=71–82 |url = https://www.academia.edu/17269986/Physico-chemical_Parameters_and_Macrobenthic_Invertebrates_of_the_Intertidal_Zone_of_Gusa_Cagayan_de_Oro_City_Philippines |accessdate = 2015-12-08}}{{registration required}}</ref>{{failed verification|date=April 2016}}<!-- article uses the word "transect" many times but never defines it --> |
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It requires an observer to move along a fixed path and to count occurrences along the path and, at the same time (in some procedures), obtain the distance of the object from the path. This results in an estimate of the area covered and an estimate of the way in which detectability increases from probability 0 (far from the path) towards 1 (near the path). Using the raw count and this probability function, one can arrive at an estimate of the actual density of objects. |
It requires an observer to move along a fixed path and to count occurrences along the path and, at the same time (in some procedures), obtain the distance of the object from the path. This results in an estimate of the area covered and an estimate of the way in which detectability increases from probability 0 (far from the path) towards 1 (near the path). Using the raw count and this probability function, one can arrive at an estimate of the actual density of objects.[[File:Transects of fire boundary above Backhouse Tarn.jpg|thumb|Transects being used to measure the changes around the boundary of a grassland fire near Backhouse Tarn, Tasmania.]] |
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| ⚫ | The estimation of the abundance of populations (such as terrestrial mammal species) can be achieved using a number of different types of transect methods, such as strip transects, [[Line-intercept sampling|line transects]], [[belt transect]]s, [[point transect]]s<ref>Buckland, S. T.; Anderson, D. R.; Burnham, K. P.; Laake, J. L. 1993. [http://www.colostate.edu/Dept/coopunit/download.html ''Distance Sampling: Estimating Abundance of Biological Populations'']. London: Chapman and Hall. {{ISBN|0-412-42660-9}}</ref>{{page needed|date=April 2016}}, [[Gradsect|gradsects]] and curved line transects.<ref>Line Lex Hiby, M. B. Krishna 2001. "Transect Sampling from a Curving Path". ''Biometrics''. 57(3):727–731 [http://www.creem.st-and.ac.uk/tiago/webpages/pdfs/Hiby&Krishna2001.pdf] {{Webarchive|url=https://web.archive.org/web/20070930121723/http://www.creem.st-and.ac.uk/tiago/webpages/pdfs/Hiby%26Krishna2001.pdf|date=2007-09-30}}</ref> |
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[[File:Transects of fire boundary above Backhouse Tarn.jpg|thumb|Transects being used to measure the changes around the boundary of a grassland fire near Backhouse Tarn, Tasmania.]] |
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| ⚫ | The estimation of the abundance of populations (such as terrestrial mammal species) can be achieved using a number of different types of transect methods, such as |
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== See also == |
== See also == |
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* {{annotated link|Census}} |
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* {{annotated link|Mark and recapture}} – Method for estimating a species population size |
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* {{annotated link|Distance sampling}} |
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* {{annotated link|MegaTransect}} |
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== References == |
== References == |
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[[Category:Ecological techniques]] |
[[Category:Ecological techniques]] |
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[[Category:Environmental statistics]] |
[[Category:Environmental statistics]] |
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[[Category:Environmental Sampling Equipment]] |
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Latest revision as of 02:15, 3 January 2024
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A transect is a path along which one counts and records occurrences of the objects of study (e.g. plants).[citation needed]
It requires an observer to move along a fixed path and to count occurrences along the path and, at the same time (in some procedures), obtain the distance of the object from the path. This results in an estimate of the area covered and an estimate of the way in which detectability increases from probability 0 (far from the path) towards 1 (near the path). Using the raw count and this probability function, one can arrive at an estimate of the actual density of objects.
The estimation of the abundance of populations (such as terrestrial mammal species) can be achieved using a number of different types of transect methods, such as strip transects, line transects, belt transects, point transects[1][page needed], gradsects and curved line transects.[2]
See also
[edit]- Census – Acquiring and recording information about the members of a given population
- Mark and recapture – Animal population estimation method – Method for estimating a species population size
- Distance sampling – Methods for estimating the density and/or abundance of populations
- MegaTransect – 1999 ecological survey of Africa
References
[edit]- ^ Buckland, S. T.; Anderson, D. R.; Burnham, K. P.; Laake, J. L. 1993. Distance Sampling: Estimating Abundance of Biological Populations. London: Chapman and Hall. ISBN 0-412-42660-9
- ^ Line Lex Hiby, M. B. Krishna 2001. "Transect Sampling from a Curving Path". Biometrics. 57(3):727–731 [1] Archived 2007-09-30 at the Wayback Machine
External links
[edit]
The dictionary definition of transect at Wiktionary
