Equipment for Use in Ecological Studies Using Scuba1

Fager, E. W.; Flechsig, A. O.; Ford, R.; Clutter, Robert I.; Ghelardi, R. J.

doi:10.4319/lo.1966.11.4.0503

Cited by 24 publications

(5 citation statements)

References 3 publications

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“…Over irregular substrates and in areas with submerged reefs and in the rich inshore gulley situations there is no alternative to a plankton net being controlled directly by a SCUBA or snorkel diver. Fager et al (1966) described a multilayered plankton net that was designed to be pushed by SCUBA divers, but this method of propulsion would be laborious and restrictive in operation. A simpler method of sampling coral reef plankton was used by Emery (1968) who used simple hand nets for taking plankton samples from difficult and inaccessible areas.…”

Section: Discussionmentioning

confidence: 99%

“…Many nets are described in the literature and the reviews by Tranter et al (1966) and the UNESCO monograph on zoological sampling methods (Tranter, 1968) give further details. Nets for taking benthic plankton are generally mounted on a sledge frame and either towed behind a boat (Russell, 1928;Wickstead, 1953), towed in shallow water by persons wading and pulling the net behind them (Colman & Segrove, 1955) or pushed by SCUBA divers (Fager et al 1966). However, all these methods still leave the need to sample rocky areas and irregular substrates where conventional methods are not possible.…”

Section: Introductionmentioning

confidence: 99%

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A diver-controlled plankton net

Potts

1976

J. Mar. Biol. Ass.

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Many types of plankton net have evolved for various sampling needs, but in the main they are designed for sampling in mid-water, or over fine particulate substrates where they can operate within a sledge frame. The conventional plankton nets are mostly towed behind a boat and can only be used in areas where there are no obstacles to impede their course. Many nets are described in the literature and the reviews by Tranter et al. (1966) and the UNESCO monograph on zoological sampling methods (Tranter, 1968) give further details. Nets for taking benthic plankton are generally mounted on a sledge frame and either towed behind a boat (Russell, 1928; Wickstead, 1953), towed in shallow water by persons wading and pulling the net behind them (Colman & Segrove, 1955) or pushed by SCUBA divers (Fager et al. 1966). However, all these methods still leave the need to sample rocky areas and irregular substrates where conventional methods are not possible. Such areas are often extremely rich in planktonic organisms which appear to accumulate within the shelter offered by gulleys and depressions in the bottom topography (personal observation). Often species associated with inshore algal belts are poorly represented in conventional offshore plankton samples (Russell, 1973), and it may be that such species spend much of their larval existence close in shore or in association with shallow water reefs. The present paper describes a diver-controlled plankton net which has been designed to sample rocky areas. By having direct diver control this plankton net can be used to sample other areas where conventional methods are not appropriate.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A diver-controlled plankton net

Potts

1976

J. Mar. Biol. Ass.

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“…At each station, Laminaria solidungula, L. saccharina and Aluria esculenra were counted and measured along the transect of known area by divers, with the aid of "fish rakes" (described by Fager et al, 1966). For pur-poses of comparison, the number of phaeophytes counted at each station has been standardized to equal plant counts for a 60 m2 survey area.…”

Section: Methodsmentioning

confidence: 99%

Distribution and Abundance of Kelp in the Alaskan Beaufort Sea near Prudhoe Bay

Busdosh¹,

Beehler²,

Robilliard³

et al. 1985

ARCTIC

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Seventeen stations on five transects near Prudhoe Bay were quantitatively sampled for kelp. The easternmost transect was located along the fringe of the Boulder Patch, an area of cobbles and boulders supporting a dense kelp community. The transects progressed westwards for 26 km. Low densities of Laminario solidwguh and L saccharina were found throughout the area. Approximately one-half of the specimens were attached, usually to a pebble or shell buried in the sand-silt substrate. Kelp was most abundant in depths of 4-7 m. No density gradient from the Boulder Patch was found within the study area. Kelp may exist over additional areas of the Beaufort Sea in sufiCient numbers to affect faunal diversity and biomass. RI?SUM@. Des Bchantillons furent prt?lev&s A dix-sept stations sur cinq lignes de sectionnement p&s de la baie Prudhoe afin d'y &miner la quan-tit6 de varech. La section la plus A l'est &ait situ& le long du "Boulder Patch", un terrain couvert de grosses pierres et de galets et supportant une dense communautt? de varech. Les lignes de sectionnement continuaient vers l'ouest sur une distance de 26 km. Des quantites peu 6leveVees de Luminaria solidungula et de L. sacchanna furent trouv&s partout dans la dgion. Environ la moitit? des swimens 6taient rattach& B quelque chose, d'habitude B des pierres ou des coquilles enterr&s dans le substrat de sable et de vase. Le varech apparaissait en quantitt plus abondante a une profondeur d'entre 4 et 7 m. Aucune diff6rence de densite dans le "Boulder Patch" ne fut perçue dans l'aire d ' h i e . II est possible que le varech existe dans d'autres r6gions de la mer de Beaufort dans des quantites pouvant toucher la diversit6 de la faune et la biomasse.

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“…Mauchline (1980), Eleftherious and Moore (2013), and Jamieson et al (2013) provide more details and examples of such devices. These nets can also be modified to sample vertically in the water column (Fager et al, 1966).…”

Section: Deep Watermentioning

confidence: 99%