A comparison of video and point intercept transect methods for monitoring subtropical coral communities

Lam, Kam-Yiu; Shin, Paul K.S.; Bradbeer, Robin; Randall, D. J.; Ku, K.K.K.; Hodgson, Paula; Cheung, S.G.

doi:10.1016/j.jembe.2005.12.009

Cited by 76 publications

(76 citation statements)

References 14 publications

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“…The video method also requires much less time in the field than UVC methodology and is therefore useful for sampling a large area or a number of sites. It requires, however, much more laboratory time spent in image analysis (Lam et al 2006). The most relevant potentiality of the ROV, in agreement with Bortone (1992) and Lam et al (2006), reside in its capability to reach depths not accessible to scuba divers and to operate in unfavorable diving conditions such as limited visibility, adverse weather, and unpredictable, rapid water currents dangerous for divers.…”

Section: Discussionmentioning

confidence: 69%

“…It requires, however, much more laboratory time spent in image analysis (Lam et al 2006). The most relevant potentiality of the ROV, in agreement with Bortone (1992) and Lam et al (2006), reside in its capability to reach depths not accessible to scuba divers and to operate in unfavorable diving conditions such as limited visibility, adverse weather, and unpredictable, rapid water currents dangerous for divers. In this study, these features improved the dataset adding seven new species to the platforms' fish community.…”

Section: Discussionmentioning

confidence: 69%

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Assessing the suitability of a remotely operated vehicle (ROV) to study the fish community associated with offshore gas platforms in the Ionian Sea: a comparative analysis with underwater visual censuses (UVCs)

et al. 2012

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The effectiveness of a remotely operated vehicle (ROV) to describe the fish communities of three gas platforms located offshore Crotone (Italy, Ionian Sea) was investigated by comparing its observations with underwater visual censuses (UVCs). The study was carried out at two depth layers (0-6 and 12-18 m). Moreover, the ROV was used to survey three deeper depth layers up to 76 m. Overall, the ROV surveys failed to give a truthful representation of the fish communities underestimating the number of species and their abundances as compared to UVCs. The main discrepancies in data regarded cryptobenthic and nekto-benthic species, whereas the ROV proved to be a suitable method to census low-mobile and abundant planktivorous species. The differences between the fish assemblage described by the ROV, with respect to the one depicted by UVC, should be considered in the light of the technical limits of the recording camera, whose resolution and field of vision is clearly lower than the diver's eye. In addition, video images did not allow for the acquisition of a correct estimate of the distance between the individuals and the platform structures. This led, almost certainly, to an under-or over-estimation of fish abundance as regards to the censused volume. In spite of this, as a result of its capacity to reach depths inaccessible to scuba divers and then to add complementary information, the ROV could be used jointly with UVCs, in studies having as their objective the description of the fish communities associated with offshore platforms.

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Section: Discussionmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 69%

Assessing the suitability of a remotely operated vehicle (ROV) to study the fish community associated with offshore gas platforms in the Ionian Sea: a comparative analysis with underwater visual censuses (UVCs)

et al. 2012

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“…The angle of view of a diver is ca. 80° (Lam et al 2006), and a diver is able to turn his or her head to census fish outside his or her field of view. This is not possible with the fixed angle of view of DOV.…”

Section: Suitability Of Dov For Studying Reserve Effectmentioning

confidence: 99%

Video transects as a complement to underwater visual census to study reserve effect on fish assemblages

Prigent‐Tessier¹,

Pastor²,

Francour³

et al. 2013

Aquat. Biol.

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The present study focuses on the use of diver-operated video (DOV) as a tool to evaluate the impact of a marine reserve on a fish assemblage, in comparison to underwater visual census (UVC). Samplings were conducted in the vicinity of the marine protected area (MPA) Cerbère-Banyuls (northwestern Mediterranean Sea). Four sites, with different levels of protection, were sampled 4 times, at depths of 5 and 10 m, to study abundance, species richness, structure of fish assemblages and fish aggregation. Results obtained by DOV and UVC provided evidence of significant effects of protection on abundance, species richness and fish assemblages. However, detection of weaker reserve effects using DOV may be limited. Furthermore, certain species are difficult to identify by video (e.g. Symphodus spp.), but DOV may be useful when studying a target and/or easily identifiable species. Contrary to UVC, DOV data can be archived and used for further study. Results concerning fish aggregation within fish assemblages showed specific patterns. Sites outside the MPA were mainly characterized by the absence of fish or few fish aggregations, and sites inside were characterized by high fish density (i.e. dispersed or patched aggregations). Thus, the fish aggregation parameter measured using DOV is an interesting metric to quantify reserve effect. Consequently, although this technique is time-consuming to produce results, DOV presents great potential for estimating MPA effectiveness while allowing simultaneous work on several sites to limit temporal bias.

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“…Pengamatan terhadap persen penutupan karang dilakukan dengan metode Point Intercept Transect (PIT) yang bertujuan mengetahui persen penutupan kondisi terumbu karang (Weinberg, 1981;Riegl, 1999;Hill et al, 2004;Lam et al, 2005) Metode Underwater Visual Census (UVC) digunakan untuk melakukan pengamatan terhadap jenis ikan karang dan menghitung kelimpahan ikan karang dalam suatu wilayah Madduppa et al, 2013;Halfrod, 1994;Samoilys et al, 2000;Kolinski et al, 2002;Hill et al, 2004). Transek pengamatan yang dilakukan untuk kelimpahan ikan adalah 2 x (5 m x 25 m) dengan patokan transek yang telah dibentangkan sebelumnya untuk pengamatan persen penutupan terumbu karang.…”

Section: Metode Pengambilan Dataunclassified

Suitability of Coral Reef Ecosystem Condition Based on Local Ecology Knowledge With Survey Method in East Coast of Weh Island

Siregar¹,

Adrianto²,

Madduppa

2017

J. Ilmu dan Teknologi Kelautan Tropis

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Local ecological knowledge (LEK) refers to the knowledge of people in a local ABSTRAKPengetahuan ekologi lokal (PEL) merupakan pengetahuan yang dimiliki suatu kelompok masyarakat yang dapat digunakan dalam menilai kondisi lingkungan dan menggambarkan interaksi yang terjadi dalam suatu ekosistem. Tujuan dari penelitian ini adalah untuk mengkaji kondisi ekologi ekosistem terumbu karang berdasarkan PEL masyarakat di Kawasan Konservasi Perairan Daerah Pesisir Timur Pulau Weh (KKPD) PTPW Sabang. Penilaian kondisi ekosistem terumbu karang berdasarkan pengetahuan ekologi lokal dibuktikan dari kesesuaian wilayah antara peta kondisi terumbu karang berdasarkan PEL dan peta pengamatan kondisi terumbu karang selama penelitian. Berdasarkan PEL, wilayah PTPW Sabang dengan kondisi terumbu karang kategori buruk berada di peraian utara Kelurahan Kota Atas, kategori sedang terdapat di sepanjang perairan kelurahan Ie Meule dan Ujung Kareng serta wilayah Anoi Itam kecuali Benteng. Hasil pengamatan pada 13 stasiun pengamatan diketahui bahwa wilayah perairan disekitar Sumur Tiga, Ujung Kareung serta Benteng memiliki kondisi yang baik yaitu penutupan berkisar dari 51-65%. Sedangkan wilayah perairan sekitar Ujung Seuke, Anoi Itam serta Reuteuk memiliki kategori sedang yaitu persen penutupan berkisar dari 44-49%. Persepsi responden terhadap kondisi terumbu karang selama 10 tahun terakhir diperoleh sebanyak 55% responden di Ie Meule dan 74,29% responden di Anoi Itam menyatakan terjadi peningkatan terhadap penutupan terumbu karang.

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A comparison of video and point intercept transect methods for monitoring subtropical coral communities

Cited by 76 publications

References 14 publications

Assessing the suitability of a remotely operated vehicle (ROV) to study the fish community associated with offshore gas platforms in the Ionian Sea: a comparative analysis with underwater visual censuses (UVCs)

Assessing the suitability of a remotely operated vehicle (ROV) to study the fish community associated with offshore gas platforms in the Ionian Sea: a comparative analysis with underwater visual censuses (UVCs)

Video transects as a complement to underwater visual census to study reserve effect on fish assemblages

Suitability of Coral Reef Ecosystem Condition Based on Local Ecology Knowledge With Survey Method in East Coast of Weh Island

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