Consulta: subjectFacets:"Underwater visual census"
Registros recuperados: 4
Data/hora: 04/06/2024 09:47:22

Comparing environmental DNA metabarcoding and underwater visual census to monitor tropical reef fishes
Provedor de dados: 5
Autores: Polanco Fernández, Andrea; Marques, Virginie; Fopp, Fabian; Juhel, Jean‐baptiste; Borrero‐pérez, Giomar Helena; Cheutin, Marie‐charlotte; Dejean, Tony; González Corredor, Juan David; Acosta‐chaparro, Andrés; Hocdé, Régis; Eme, David; Maire, Eva; Spescha, Manuel; Valentini, Alice; Manel, Stéphanie; Mouillot, David; Albouy, Camille; Pellissier, Loïc.
Environmental DNA (eDNA) analysis is a revolutionary method to monitor marine biodiversity from animal DNA traces. Examining the capacity of eDNA to provide accurate biodiversity measures in species‐rich ecosystems such as coral reefs is a prerequisite for their application in long‐term monitoring. Here, we surveyed two Colombian tropical marine reefs, the island of Providencia and Gayraca Bay near Santa Marta, using eDNA and underwater visual census (UVC) methods. We collected a large quantity of surface water (30 L per filter) above the reefs and applied a metabarcoding protocol using three different primer sets targeting the 12S mitochondrial DNA, which are specific to the vertebrates Actinopterygii and Elasmobranchii. By assigning eDNA sequences to...
Tipo: Text
Palavras-chave: Biodiversity; Biomonitoring; Caribbean Sea; Environmental DNA; Reef fishes; Underwater visual census.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00653/76543/77643.pdf

Functional differences between fish communities on artificial and natural reefs: a case study along the French Catalan coast
Provedor de dados: 5
Autores: Koeck, Barbara; Tessier, Anne; Brind'Amour, Anik; Pastor, Jeremy; Bijaoui, Benjamin; Dalias, Nicolas; Astruch, Patrick; Saragoni, Gilles; Lenfant, Philippe.
In the context of growing anthropogenic disturbances that deeply alter marine coastal ecosystems, various management tools are used to protect biodiversity, such as fishing gear limitations, fishing quotas, protected areas or the creation of artificial reefs (ARs). In contrast to the other management tools, ARs require a modification of natural habitats. We used underwater visual censuses to investigate the effect of habitat modification on the structure of fish communities by comparing a natural reef (NR) to ARs with different habitat complexity. Different fish assemblage descriptors were used to assess species- and functional- and community-level aspects of the assemblages. ARs were rapidly colonized by adult fishes and presented community compositions...
Tipo: Text
Palavras-chave: Ecological niche; Fish community; Fisheries management; Functional diversity; Gulf of Lion; Habitat complexity; Mediterranean Sea; Underwater visual census.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00189/30029/28514.pdf

Comparative evaluation of fish assemblages census on an artificial reef
Provedor de dados: 104
Autores: Brotto,Daniel S.; Krohling,Werther; Zalmon,Ilana R.
One of the main issues regarding artificial reef fish evaluation is the performance of an efficient visual census sampling. An experimental artificial reef made of four different types of concrete modules was implanted on the north coast of Rio de Janeiro (21º29'S, 41º00W). Two interval-sampling periods using a visual census method were performed in the summer of 2003 (N = 6) and 2004 (N = 6), weekly and daily, respectively. The longer interval-sampling period showed twice of species with eight exclusive ones. Total fish abundance was higher during the shorter interval-sampling period, due to the presence of large shoals of Chloroscombrus chrysurus (Linnaeus, 1766) and Haemulon aurolineatum (Cuvier, 1829) especially at the complex modules. Fish abundance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Experimental reef complex; Rio de Janeiro; Sampling period; Underwater visual census.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000400037

Abundance of the invasive lionfish Pterois volitans in the coastal coral reefs from Colombian Caribbean
Provedor de dados: 50
Autores: Chasqui,Luis; Rincón-Díaz,Natalia; Vanegas,María Juliana.
ABSTRACT The abundance of the invasive lionfish Pterois volitans was assessed through visual censuses conducted in 2015 and 2016 at 54 sites in six localities with coral reefs across the Colombian Caribbean coast. The invader was observed across locations and in most of the dives, with sighting frequency of 88 %, abundance values from 0 to 9.7 ± 2.1 ind/250 m2 (388 ind/ha), and 0.8 ± 1.3 ind/250 m2 (32 ind/ha) as total mean. The average density was similar to values reported in other works that counted lionfish in a broad spatial scale on the invaded area and the highest value approximated the maximum density estimated in Colombia and other locations around the Caribbean.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Southern Caribbean; Invasive alien species; Underwater visual census; Lionfish density.
Ano: 2020
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612020000100157