Diver-operated suction sampling in Norwegian cobble grounds: technique and associated fauna
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Marine cobble habitats in shallow waters are rich in faunal assemblages and known settling grounds for valuable fishery resources such as lobsters and crabs. Sampling these grounds is challenging as traditional techniques do not efficiently collect fast-moving benthic invertebrates. Typically, fast moving crustaceans are not sampled according to actual densities. This study used airlift suction sampling, pioneered in North America, to quantify benthic faunal assemblages in cobble grounds across 68 sampling locations in south-western Norway. In total, 72 species of benthic invertebrates (5276 individual specimens) were identified, with an overall sampling efficiency of 76.4%. Polychaeta and decapod crustaceans dominated the samples, with species diversity (Shannon Index, ) highest in Location 3. Cluster and Ordination analyses were further used to relate assemblages to a number of selected variables. Overall, the study highlights that suction sampling provides a low-cost and efficient method for quantifying mobile benthic fauna in structurally complex marine habitats (i.e., cobble).
Les habitats marins à galets en eau peu profonde sont riches en assemblages fauniques et sont des fonds de recrutement connus pour les ressources halieutiques de valeur comme les homards et les crabes. L’échantillonnage des ces fonds est un défi car les techniques traditionnelles ne récoltent pas efficacement les invertébrés benthiques se déplaçant rapidement. Typiquement, vu les densités actuelles, les Crustacés à déplacement rapide ne sont pas échantillonnés. Cette étude utilise un échantillonnage par aspiration, pionnier en Amérique du Nord, pour quantifier les assemblages benthiques sur les fonds de galets au niveau de 68 points d’échantillonnage dans le sud-ouest de la Norvège. Au total, 72 espèces d’invertébrés benthiques ont été identifiées (5276 spécimens individuels) avec une efficacité d’échantillonnage totale de 76,4%. Les Polychètes et les Crustacés Décapodes dominent dans les échantillons, avec une diversité spécifique (Index de Shannon, ) la plus élevée pour Location 3. Des analyses typologiques et de classification étaient utilisées par la suite pour relier les assemblages à un nombre sélectionné de variables. Au total, l’étude souligne que l’échantillonnage par aspiration fournit une méthode efficace et peu coûteuse pour quantifier la faune mobile benthique dans les habitats marins structurellement complexes (i.e., galets).
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Diver-operated suction sampling in Norwegian cobble grounds: technique and associated fauna
In: CrustaceanaSearch for other papers by Halldis Ringvold in
Current site
Google Scholar
PubMed
Search for other papers by John-Arvid Grytnes in
Current site
Google Scholar
PubMed
Search for other papers by Gro I. van der Meeren in
Current site
Google Scholar
PubMed
Marine cobble habitats in shallow waters are rich in faunal assemblages and known settling grounds for valuable fishery resources such as lobsters and crabs. Sampling these grounds is challenging as traditional techniques do not efficiently collect fast-moving benthic invertebrates. Typically, fast moving crustaceans are not sampled according to actual densities. This study used airlift suction sampling, pioneered in North America, to quantify benthic faunal assemblages in cobble grounds across 68 sampling locations in south-western Norway. In total, 72 species of benthic invertebrates (5276 individual specimens) were identified, with an overall sampling efficiency of 76.4%. Polychaeta and decapod crustaceans dominated the samples, with species diversity (Shannon Index, ) highest in Location 3. Cluster and Ordination analyses were further used to relate assemblages to a number of selected variables. Overall, the study highlights that suction sampling provides a low-cost and efficient method for quantifying mobile benthic fauna in structurally complex marine habitats (i.e., cobble).
| All Time | Past Year | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 310 | 40 | 3 |
| Full Text Views | 149 | 12 | 3 |
| PDF Views & Downloads | 47 | 9 | 0 |