Validity of movie recording for quantitative abundance estimation and body size measurement of Macrobrachium shrimps
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- Saito Minoru
- Faculty of Integrated Arts and Sciences, University of Tokushima
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- Hamano Tatsuo
- Institute of Socio Arts and Sciences, University of Tokushima
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- Nakata Kazuyoshi
- Graduate School of Environmental and Life Science, Okayama University
書誌事項
- タイトル別名
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- Validity of movie recording for quantitative abundance estimation and body size measurement of <i>Macrobrachium</i> shrimps
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Collecting Macrobrachium shrimps for abundance estimation is challenging, especially in high gradient, boulder dominated streams. The recent advent of digital cameras could change the situation by enabling previously under-used snorkel counting to yield verifiable data. The validity and efficiency of underwater movie recording for shrimp census were tested and compared with those of underwater shrimp net collection and sweeping in a field experiment (1–4 adult shrimps/m2). Total length estimates from the video footage were compared with caliper measurements. Detection was not affected by species, sex, or shrimp density. Movie recording and shrimp net collection yielded high and constant detection probability of adult shrimps (0.955 and 0.874), in contrast to sweeping (0.097). The movie recording had higher efficiency than the other two methods. For juveniles, only shrimp net collection was valid as an abundance indicator, with a detection probability of 0.338. Accuracy of total length estimates made from the video footage did not differ between species or sex and was highly correlated with the actual measurements by digital caliper. These results confirm that in adult Macrobrachium shrimps, the movie recording is valid for body size and quantitative abundance estimation, but not in juveniles.
収録刊行物
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- Crustacean Research
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Crustacean Research 44 (0), 39-53, 2015
日本甲殻類学会
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詳細情報 詳細情報について
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- CRID
- 1390001204703330560
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- NII論文ID
- 130005108224
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- NII書誌ID
- AA10988150
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- ISSN
- 21895317
- 02873478
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- NDL書誌ID
- 026976837
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可