New development in the MOCNESS, an apparatus for sampling zooplankton and micronekton

Wiebe, Peter H.; Morton, A. W.; Bradley, A. M.; Backus, Richard H.; Craddock, James E.; Barber, Valerie; Cowles, Timothy J.; Flierl, Glenn R.

doi:10.1007/bf00397811

Cited by 433 publications

(201 citation statements)

References 14 publications

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“…75 m during a cruise of the RV 'Soyo-Maru' (National Research Institute of Fisheries Science, Japanese Fisheries Agency) from 1 to 6 June 1997, and a cruise of the RV 'Wakataka-Maru' (Tohoku National Fisheries Research Institute, Japanese Fisheries Agency) from 7 to 9 June 1998. During a cruise of the RV 'Wakataka-Maru' from 1 to 13 September 1998, vertically stratified samplings were made at 7 stations with a multiple-opening/closing net and an environmental sensing system, MOC-NESS (0.9 × 1.3 m mouth opening; 0.33 mm mesh net; Wiebe et al 1985), to sample 0-25, 25-50, 50-150, and 150-250 m depth strata during the daytime (7 tows) and at night (5 tows). During a cruise of the RV 'Hakuho-Maru' from 27 September to 23 October 1998, a 10 foot IKMT fitted with a 0.5 mm mesh net was obliquely towed to sample depths within the upper 250 m. Plankton samples were fixed in 10% buffered formalin seawater at sea.…”

Section: Methodsmentioning

confidence: 99%

Larval feeding habits of Diaphus theta, Protomyctophum thompsoni, and Tarletonbeania taylori (Pisces: Myctophidae) in the transition region of the western North Pacific

Sassa¹,

Kawaguchi²

2005

Mar. Ecol. Prog. Ser.

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We examined the larval feeding habits of the 3 dominant myctophids, Diaphus theta, Protomyctophum thompsoni, and Tarletonbeania taylori, in the transition region of the western North Pacific. Feeding incidence for D. theta and T. taylori larvae was higher during the day than at night (mean: 70.7 to 84.4% vs. 2.2 to 4.1%), indicating that they are daytime visual feeders. Larvae of P. thompsoni were also visual feeders, with a daytime feeding incidence of 83.0%. The proportion of nighttime feeding in P. thompsoni gradually increased with development, which suggests faster larval adaptation of this non-migrant species to the poor light conditions in the mesopelagic zone. D. theta larvae ≤7.9 mm in body length (BL) fed mainly on copepod nauplii, which were replaced by calanoid copepodites and Oithona spp. in larvae ≥8.0 mm BL. The most important prey for smaller P. thompsoni and T. taylori larvae ≤7.9 mm BL were nauplii and Oithona spp., which were replaced by calanoid copepodites and ostracods in P. thompsoni and copepod eggs in T. taylori with increased development. Competition for prey among the larvae of these 3 myctophids was mostly avoided because of diet and habitat-depth segregation. Interspecific comparisons of feeding habits among the 3 species, in addition to larvae of 3 other myctophids found in the study area, suggested that their feeding strategies were associated with mouth size, i.e. larvae with larger mouths tended to take larger prey rather than a large number of smaller prey. This interspecific difference in feeding strategy is reflected in the diverse morphological characters of myctophid fish larvae.

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Section: Methodsmentioning

confidence: 99%

Larval feeding habits of Diaphus theta, Protomyctophum thompsoni, and Tarletonbeania taylori (Pisces: Myctophidae) in the transition region of the western North Pacific

Sassa¹,

Kawaguchi²

2005

Mar. Ecol. Prog. Ser.

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“…Two tows of 3 samples each (sample length about 1 h) were made over the seamount; each tow was a continuous transect from about 1100 m depth on the flanks to 600 m near one of the Table 1 and Genin (1987) for details]. The other seamounts were sampled in 1989 with a 9-net and in 1990-1991 with a 20-net (333 pm mesh, 1 m2) MOCNESS (Wiebe et al 1985). Tows were taken over and in the deep water areas on 2 sides of the seamounts (average time of tows 160 min, SD 48 min, n = 34).…”

Section: Methodsmentioning

confidence: 99%

Copepod carcasses in the ocean. I. Over seamounts

Haury¹,

C²,

Gal³

et al. 1995

Mar. Ecol. Prog. Ser.

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Hlgher abundances of copepods with external damage or in various states of internal decay have been found in shallow waters over banks, ridges and seamounts than in the surrounding waters. The increase occurred in 3 of 5 sets of multiple opening-closing net tows taken at Fieberling Guyot, Northeast Bank and Sixtymile Bank, west of San Diego, California, USA. Large numbers of copepod carcasses were also found above the summit of Jasper Seamount. The carcasses are attributed to higher levels of predation over shallow topographic features due to resident organisms that ascend above the summits at night to feed. At Fieberling Guyot (summit depth of about 500 m), this migration was at least 400 m above the summit. Carcasses identical to those collected in the net tows were produced in the laboratory by euphausiids feeding on copepods.

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“…The sampling gear on the Discovery cruise was a 1 m 2 MOCNESS (Wiebe et al 1985) with nine black nets of 333 mm mesh size. On the Meteor cruise, a 1 m 2 Double-MOCNESS with 2 )10 nets was employed.…”

Section: á1mentioning

confidence: 99%

The near-bottom plankton community at the Porcupine Abyssal Plain, NE-Atlantic: Structure and vertical distribution

Christiansen¹,

Bühring²,

Pfannkuche³

et al. 2010

Marine Biology Research

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The study presents results on the composition and vertical distribution of the near-bottom plankton community at an abyssal site in the NE Atlantic. Plankton samples were collected at 1, 15, 50 and 100 m above bottom (mab). Whereas the composition within the upper three layers was very similar, a major shift occurred in the immediate vicinity of the seafloor. Between 100 and 15 mab, the plankton was dominated by Copepoda, making up more than 75% of the total abundance and biomass (without gelatinous organisms). At 1 mab, Copepoda were still abundant, but their share decreased to ca. 50%, while Polychaeta, Malacostraca and Chaetognatha became important groups. Within the Copepoda, the predominance of the genus Metridia (Calanoida) in the upper layers was replaced by the genus Benthomisophria (Misophrioida) at 1 mab. Despite enrichment in organic particles towards the bottom, the total abundance and biomass of plankton did not show marked differences between the four layers investigated. Several hypotheses are discussed which may explain why the presumably higher food concentrations near the deep-sea floor do not lead to increased standing stocks of the plankton community.

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New development in the MOCNESS, an apparatus for sampling zooplankton and micronekton

Cited by 433 publications

References 14 publications

Larval feeding habits of Diaphus theta, Protomyctophum thompsoni, and Tarletonbeania taylori (Pisces: Myctophidae) in the transition region of the western North Pacific

Larval feeding habits of Diaphus theta, Protomyctophum thompsoni, and Tarletonbeania taylori (Pisces: Myctophidae) in the transition region of the western North Pacific

Copepod carcasses in the ocean. I. Over seamounts

The near-bottom plankton community at the Porcupine Abyssal Plain, NE-Atlantic: Structure and vertical distribution

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