Seasonal changes in distribution and abundance of euphausiids in the coastal area of north-eastern Japan

Taki, Kenji

doi:10.1111/j.1444-2906.2007.01364.x

Cited by 6 publications

(5 citation statements)

References 24 publications

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“…Mean abundance over the entire study period (August 2002-August 2004) of E. pacifica, T. inspinata and T. longipes at Site H were of the same order of magnitude to those of respective species reported from off northeastern Japan (Taki 2006(Taki , 2007. Among the three euphausiids studied by Taki, biomass data were available only for E. pacifica, with a reported value of less than half that found in our study (Table 3).…”

Section: Abundance and Biomassmentioning

confidence: 66%

“…Among the three euphausiids studied by Taki, biomass data were available only for E. pacifica, with a reported value of less than half that found in our study (Table 3). Compared with our data derived from Bongo nets (70 cm diameter, 350 mm mesh) towed obliquely from 1000 m, Taki's (2006Taki's ( , 2007 data were from a combination of Norpac nets (45 cm diameter, 335 mm mesh) towed vertically from 150 m and conical nets (130 cm diameter, 450 mm mesh) towed obliquely from Ͻ300 m. This methodological difference may be a reason why our sampling was more efficient to collect larger E. pacifica specimens than Taki's. Iguchi & Ikeda (1999) used Norpac nets (45 cm diameter, 330 mm mesh) to estimate abundance and biomass of E. pacifica in Toyama Bay, but such methodological effects on the results were not evident ( Table 3).…”

Section: Abundance and Biomassmentioning

confidence: 98%

“…Mauchline & Fisher 1969). While the three euphausiids are all subarctic euphausiids, E. pacifica occur over a wide temperature range (Ͻ2-16°C), as compared to T. inspinata from 0-12°C and T. longipes from 0.3-5.1°C at 100 m depth (Taki 2007). From these species-specific temperature preferences, an extremely low abundance of T. longipes during December 2003-August 2004 (Fig.…”

Section: Abundance and Biomassmentioning

confidence: 99%

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Abundance, biomass and life cycle patterns of euphausiids (Euphausia pacifica, Thysanoessa inspinata and T. longipes) in the Oyashio region, western subarctic Pacific

Kim

Yamaguchi

Ikeda

2009

Plankton Benthos Res

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A series of oblique hauls with Bongo nets (0–1000 m) was made during the period of August 2002 through August 2004 in the Oyashio region, western subarctic Pacific, to investigate abundance, biomass and life cycle patterns of the three predominant euphausiids (Euphausia pacifica, Thysanoessa inspinata and T. longipes). While the three euphausiids occurred throughout the entire study period, E. pacifica was the most abundant (1,120 indiv.m^−2, or 832 mg C m^−2), followed by T. inspinata (163 indiv.m^−2, or 144 mg C m^−2) and T. longipes (73 indiv.m^−2, or 75 mg C m^−2). Judging from the occurrence of females with spermatophores and furcilia larvae, the spawning was considered to take place twice a year (April–May and August) for E. pacifica, year-round (peak season: March–May) for T. inspinata and in spring (March–May) for T. longipes. The population structure in terms of size (=total length) frequency distributions of the three euphausiids was characterized by the frequent co-occurrence of 2–3 cohorts in the same samples. The maximum size of males and females found were 21 mm and 24 mm, respectively, for E. pacifica, 18 mm and 23 mm, respectively, for T. inspinata, 27 mm and 31 mm, respectively, for T. longipes. Tracing the sequence of cohorts, the life spans of E. pacifica, T. inspinata and T. longipes were estimated to be 17–26 months, 17–19 months and 29–31 months, respectively. These results are compared with reports of the same species in other habitats in the light of regional variations

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Section: Abundance and Biomassmentioning

confidence: 66%

Section: Abundance and Biomassmentioning

confidence: 98%

Section: Abundance and Biomassmentioning

confidence: 99%

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Abundance, biomass and life cycle patterns of euphausiids (Euphausia pacifica, Thysanoessa inspinata and T. longipes) in the Oyashio region, western subarctic Pacific

Kim

Yamaguchi

Ikeda

2009

Plankton Benthos Res

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“…A preferred water temperature of E. pacifica ranged between 5 and 16 • C, and their abundances were centered in the CC region (Taki, 2007;Lara-Lopez et al, 2012;Tao et al, 2015).…”

Section: Euphausiid Community Structure In Relation To Hydrographymentioning

confidence: 99%

Feeding Ecology of Three Euphausiid Species in the North Pacific Ocean Inferred From 18S V9 Metabarcoding and Stable Isotope Analysis

et al. 2021

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Euphausiids are abundant micronekton and important links between higher and lower trophic levels in marine ecosystems; however, their detailed diets cannot be fully understood by conventional microscopy, especially in subtropical areas. Here, we report the euphausiid community structure in the California Current (CC) area and the eastern/western North Pacific subtropical gyre (ESG and WSG) and detail the feeding ecology of the dominant species (Euphausia pacifica, E. brevis, and E. hemigibba) in each region using a combined approach of gut content analysis via 18S V9 metabarcoding and stable carbon and nitrogen isotope analysis. A pronounced omnivorous feeding of all studied euphausiid species was supported by both methods: phytoplanktonic taxonomic groups (Dinophyta, Stramenopiles, and Archaeplastida), Copepoda, and Hydrozoa were detected in the gut contents; all the three euphausiid species displayed an intermediate trophic position between the net plankton (0.2–1.0 mm) and the myctophid fish (15.2–85.5 mm). However, Hydrozoa found in euphausiid gut contents likely derived from a potential cod-end feeding, based on isotope analysis. E. pacifica in the CC province ingested more autotrophic prey, including pelagophyte and green algae, due to a greater abundance of Stramenopiles and Archaeplastida in shallow layers of CC water. On the other hand, non-autotrophic prey such as mixotrophic Kareniaceae dinoflagellates, Pontellidae and Clausocalanidae copepods, and Sphaerozoidae rhizarian contributed more to the diets of E. brevis and E. hemigibba because of a lower chlorophyll a concentration or potentially a scarcity of autotrophic prey availability in ESG and WSG. The feeding patterns of dominant euphausiid species conducting filter feeding were thus largely determined by phytoplankton prey availability in the environments. Dietary difference across three species was also indicated by stable isotope analysis, with a lower mean trophic level of E. pacifica (2.32) than E. brevis (2.48) and E. hemigibba (2.57). These results verify direct trophic interactions between euphausiids and primary production and suggest that the omnivorous feeding habit is a favorable character for dominant Euphausia species.

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“…Across the North Pacific, the distribution and abundance of the 3 euphausiids Euphausia pacifica, Thysanoessa spinifera and T. inspinata have been shown to respond in a complex manner to oceanographic variation (Tanasichuk 1998a,b, Marinovic et al 2002, Mackas et al 2004, Dorman et al 2005, Taki 2007, Pinchuk et al 2008, in some cases with detectable effects on the diets of euphausiid predators (Ainley et al. 1996, Brodeur et al 2007.…”

Section: Annual Variationmentioning

confidence: 99%

Euphausiids in the diet of a North Pacific seabird: annual and seasonal variation and the role of ocean climate

Hipfner¹

2009

Mar. Ecol. Prog. Ser.

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Across the California Current System (CCS), euphausiid crustaceans are important prey for many vertebrate predators, including the seabird Cassin's auklet Ptychoramphus aleuticus. However, the effects of ocean climate on euphausiid biology, and their consequences for predators, remain poorly understood. Over a 13 yr period (1996 to 2008), Euphausia pacifica, Thysanoessa spinifera and T. inspinata cumulatively averaged about 35% of the annual biomass in the nestling diets of auklets at Triangle Island, but there was marked inter-annual variation. Whereas ocean climate had little influence on the amounts of E. pacifica or T. inspinata delivered, diets included more T. spinifera if spring sea-surface temperatures in the previous year had been lower. Cold conditions might facilitate the production of a strong annual cohort, thus increasing adult biomass in the following year. Within seasons, the amount of E. pacifica in diets declined with date, and the decline was consistent across both warm-and cold-water years. In contrast, diets were especially rich in both Thysanoessa spp. late in the provisioning period in warm-water years, when the harvest of Neocalanus cristatus declined dramatically due to a temporal mismatch between the auklet predator and this copepod prey. Both the annual nestling survival rate and the mean fledging masses of Cassin's auklets were tightly correlated to the amount of N. cristatus in their diets, and for fledging mass there was a further small, additive effect of increased amounts of T. inspinata. Results of the present study add new insight into effects of ocean climate on euphausiid biology in the northern CCS, and their potential consequences for population processes of an important euphausiid predator. KEY WORDS: Auklet · Diet · Euphausiids · Ocean climate · Prey-switching Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 390: [277][278][279][280][281][282][283][284][285][286][287][288][289] 2009 Tanasichuk 2002, Brinton & Townsend 2003, Croll et al. 2005, Suntsov & Brodeur 2008. Research has shown that the population biology of both of these euphausiids is influenced by ocean climate (Tanasichuk 1998a,b, Marinovic et al. 2002, Brinton & Townsend 2003, Dorman et al. 2005), but in a complex manner that remains poorly understood (Abraham & Sydeman 2004). In this marine system, studies on the breeding ecology of Cassin's auklet Ptychoramphus aleuticus, a regionally abundant zooplanktivorous seabird, have provided considerable insight (Ainley et al. 1996, Sydeman et al. 2001, Adams et al. 2004.At breeding colonies in the southern and central CCS, Euphausia pacifica and Thysanoessa spinifera are the primary prey fed to Cassin's auklet Ptychoramphus aleuticus nestlings. Over the course of the birds' spring and summer breeding season, the amount of adult E. pacifica in nestling diets tends to decrease, while the amount of juvenile and adult T. spinifera tends to increase (Adams et al. 2004, Abraham & Sydeman 2006. This dietary switch...

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Seasonal changes in distribution and abundance of euphausiids in the coastal area of north-eastern Japan

Cited by 6 publications

References 24 publications

Abundance, biomass and life cycle patterns of euphausiids (Euphausia pacifica, Thysanoessa inspinata and T. longipes) in the Oyashio region, western subarctic Pacific

Abundance, biomass and life cycle patterns of euphausiids (Euphausia pacifica, Thysanoessa inspinata and T. longipes) in the Oyashio region, western subarctic Pacific

Feeding Ecology of Three Euphausiid Species in the North Pacific Ocean Inferred From 18S V9 Metabarcoding and Stable Isotope Analysis

Euphausiids in the diet of a North Pacific seabird: annual and seasonal variation and the role of ocean climate

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