Pelagic chaetognaths in Sagami Bay and Suruga Bay, Central Japan

Marumo, Ryuzo; Nagasawa, Sachiko

doi:10.1007/bf02108846

Cited by 10 publications

(15 citation statements)

References 11 publications

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“…The boundaries between these groups that were identified, i.e. 150 m and 400 m, coincide well with the 200 m and 500 m boundaries proposed by Marumo & Nagasawa (1973). The distribution of these groups corresponds with the vertical hydrographic structure in Sagami Bay.…”

Section: Discussionsupporting

confidence: 83%

“…In the present study, high species diversity was found during summer and autumn, and was attributed to the occurrence of species regarded as tropical species (Marumo & Nagasawa 1973), and which are included in Group 7. This pattern is similar to the previous results of Nagasawa and Marumo (1977), and is consistent with the seasonal change of copepod diversity in the epipelagic layer of Sagami Bay (Shimode et al 2006).…”

Section: Discussionsupporting

confidence: 49%

“…The 27 species have already been reported by Tokioka (1939), Marumo & Nagasawa (1973), Nagasawa & Marumo (1977), and Miyamoto & Nishida (2011). This number represents approximately 30% of the global species richness of pelagic chaetognaths and is higher than that reported from other well-investigated regions such as the Sargasso Sea Alvariño 1967, Rottman 1978, Indian Ocean (23 species: Nair et al 2002), Antarctic Ocean (six species: Johnson et al 2004), and off Chile (22 species : Fagetti 1972).…”

Section: Discussionmentioning

confidence: 65%

“…Nagasawa & Marumo (1975, Terazaki & Marumo (1979), Terazaki (1992), and Kotori (1987) investigated the vertical distributions of epipelagic chaetognaths. Although studies on meso-and bathypelagic layers (>400 m) are much fewer, chaetognath abundances and distribution have been reported by Kitou (1966aKitou ( , b, 1967a, Marumo & Nagasawa (1973), Johnson & Terazaki (2003), and Ozawa et al (2007). While a large body of knowledge has accumulated on the distribution of chaetognaths, little is known of the seasonal variation in vertical distribution throughout the water column from epipelagic to bathypelagic depths.…”

Section: Introductionmentioning

confidence: 99%

“…Extensive research has been conducted on the spatiotemporal variation of zooplankton in Sagami Bay, including studies of euphausiids (Hirota et al 1982), copepods (Shimode et al 2006, Kuriyama & Nishida 2006, amphipods (Nomura et al 2003), and chaetognaths (Marumo & Nagasawa 1973, Nagasawa & Marumo 1977, with recent observations on the gelatinous fauna being conducted using underwater vehicles and video cameras (Hunt & Lindsay 1999, Lindsay & Hunt 2005. However, previous studies often suffered from limitations of sampling coverage, with respect to season, depth, and/or equipment.…”

Section: Introductionmentioning

confidence: 99%

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Vertical distribution and seasonal variation of pelagic chaetognaths in Sagami Bay, central Japan

Miyamoto

Nishida

Kuroda

et al. 2012

Plankton Benthos Res

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Abstract:The vertical distribution and seasonal variation of pelagic chaetognaths was investigated in Sagami Bay, based on stratified zooplankton samples from the upper 1,400 m. The chaetognaths were most abundant in the 100-150 m layer in January and May 2005, whereas they were concentrated in the upper 50 m in the other months. Among the 28 species identified, Zonosagitta nagae had the highest mean standing stock, followed by Flaccisagitta enflata and Eukrohnia hamata. Cluster analysis based on species composition and density separated chaetognath communities into four groups (Groups A-D). While the distribution of Group C was unclear due to their rare occurrence, the other groups were more closely associated with depth than with season. The epipelagic group (Group A) was further divided into four sub-groups, which were related to seasonal hydrographic variation. The mesopelagic group (Group B) was mainly composed of samples from the 150-400 m layer, although Group A, in which the epipelagic species Z. nagae dominated, was distributed in this layer from May to July. Below 400 m, all samples were included in the bathypelagic group (Group D). In this group, Eukrohnia hamata was dominant with larger standing stocks than in other tropical-temperate waters, suggesting that intrusions of subarctic water drive the large standing stock of this species. Combined, these observations suggest that the seasonal and vertical patterns of the chaetognath community in Sagami Bay are influenced by hydrographic changes in the epipelagic layer and the submerged subarctic water in the mesopelagic layer.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionsupporting

confidence: 49%