An evaluation of sampling methodology for assessing settlement of temperate fish in seagrass meadows

RDF 

 
This item is provided by the institution :
Hellenic Centre for Marine Research (HCMR)
Repository :
Mediterranean Marine Science  | ΕΚΤ eJournals
see item page
in the web site of the repository *
share



Semantic enrichment/homogenization by EKT
An evaluation of sampling methodology for assessing settlement of temperate fish in seagrass meadows (EN)

ÁLVAREZ, I.
DUNAND, A.
COLINAS, N.
CATALAN, I. A.
ALOS, J.
NASH, R. D.M.

Regional Marine and rural protection Council (Balearic Islands) (EN)
Ministry of Economy and Competitiveness (MINECO), Spain (EN)

All demersal fish with planktonic larvae settle at some point early in life, generally around the transformation from larvae to juveniles or soon after. Sampling pre-settlement or very young, settled fish is challenging due to spatial concretions within the habitat and the pulsed, rapid nature of the settlement process. There is a lack of robust methods that enable this sampling, but information on the settlement, that represents a mortality bottleneck, is crucial for the follow-up of populations for fisheries and conservation purposes. An empirical evaluation of sampling methods has not been conducted in temperate habitats. Here, we compare six different sampling methods to collect pre- and post-settlement stages of fish to determine the best combination of techniques to utilise in Posidonia oceanica, an endemic Mediterranean seagrass that provides a key nursery habitat for coastal fish. We considered three types of pelagic nets (bongo net, neuston net and ring net), two types of light-traps (Quatrefoil and Ecocean CARE®) to sample pre-settled stages and a low-impact epibenthic trawl for recent settlers. Our results show a significantly different size-spectrum for each method, with a continuous range of sizes from 2 mm to 200 mm. The smallest sizes were collected by the bongo net, followed by the ring net, the neuston net, the Quatrefoil, the Ecocean and finally the epibenthic trawl. Our results suggest that an appropriate strategy for collecting and estimating the abundance of key littoral fish species around settlement size is the combination of the Ecocean light trap and the epibenthic trawl. (EN)

info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

Mediterranean (EN)
seagrass (EN)
sampling (EN)
Posidonia oceanica (EN)
Fish settlement (EN)
beam trawl (EN)
light traps (EN)

Ελληνικό Κέντρο Θαλασσίων Ερευνών (ΕΛΚΕΘΕ) (EL)
Hellenic Centre for Marine Research (HCMR) (EN)

Mediterranean Marine Science

2014-03-17


Hellenic Centre for Marine Research (EN)

Mediterranean Sea; Balearic Islands; (EN)
frozen; formaline; plankton; neuston; benthic; pelagic; fish; (EN)
2012 (EN)

1791-6763
1108-393X
Mediterranean Marine Science; Vol 15, No 2 (2014); 338-349 (EL)
Mediterranean Marine Science; Vol 15, No 2 (2014); 338-349 (EN)



*Institutions are responsible for keeping their URLs functional (digital file, item page in repository site)