Dietary shift and feeding intensity of Stenobrachius leucopsarus in the Bering Sea

Tanimata, Naoki; Yamamura, Orio; Sakurai, Yasunori; Azumaya, Tomonori

doi:10.1007/s10872-008-0014-4

Cited by 10 publications

(11 citation statements)

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“…Although no previous study has reported seasonal variations in the abundances of these forage fishes, their autumnal increases evidently led to increased consumption by chum salmon. On the other hand, the density of S. leucopsarus in the study area remained fairly stable between summer and autumn (Tanimata et al 2008). This implies that factors other than a seasonal biomass change in S. leucopsarus promoted consumption by chum salmon in early autumn.…”

Section: Discussionmentioning

confidence: 81%

Temporal variation in chum salmon, Oncorhynchus keta, diets in the central Bering Sea in summer and early autumn

et al. 2012

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Seasonal, ontogenetic, and diel variations in the diets of chum salmon, Oncorhynchus keta, were examined by analyzing the stomach contents of 1398 fish (300-755 mm fork length) collected in the Bering Sea during summer and early autumn of 2002. Whereas mesozooplankton, including euphausiids, hyperiids, and gastropods, constituted the greatest portion of the stomach contents during the summer, forage fishes (Stenobrachius leucopsarus and Atka mackerel, Pleurogrammus monopterygius) were the most important items during early autumn. Although no apparent diel trend was found in feeding intensity, distinct diel differences in prey composition were observed. Chum salmon caught in the morning contained Stenobrachius leucopsarus, whereas those caught in the afternoon had mainly fed on euphausiids. Thus, chum salmon diets change temporally because of changes in prey availability that result from differences in the annual life cycles and diurnal vertical migrations of prey species.

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Section: Discussionmentioning

confidence: 81%

Temporal variation in chum salmon, Oncorhynchus keta, diets in the central Bering Sea in summer and early autumn

et al. 2012

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Section: Thetamentioning

confidence: 99%

“…In sharp contrast, inactive Stenobrachius leucopsarus completely avoided eating salps during all months investigated. The most recent study of S. leucopsarus in the western part of the North Pacific also did not list salps as part of the diet of this species (Tanimata et al 2008).Salp feeding by the active myctophids Tarletonbeania crenularis and Diaphus theta is rather new information, since gelatinous zooplankton were not previously reported as a significant food component in these species (Tyler & Pearcy 1975). Similarly, the diet of D. theta off the Kuril Islands in Russia contained only a minor proportion of salps (Kosenok et al 2006).…”

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confidence: 96%

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Trophic ecology of three dominant myctophid species in the northern California Current region

Suntsov

Brodeur²

2008

Mar. Ecol. Prog. Ser.

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The feeding ecology of 3 dominant sympatric myctophid species (Tarletonbeania crenularis, Diaphus theta, and Stenobrachius leucopsarus) in the northern California Current System was investigated based on samples collected in June, August, and September of 2006. All 3 species fed predominantly on Euphausia pacifica, the most abundant euphausiid off the central Oregon coast. In contrast, the same 3 lanternfishes showed marked variation in utilization of other principal food categories, and stronger resource partitioning was evident in smaller individuals. The proportion of euphausiids in the diet of T. crenularis and S. leucopsarus gradually increased with increasing size. D. theta at intermediate sizes (31 to 60 mm) preyed heavily upon salps and hyperiid amphipods, whereas the largest specimens consumed mostly euphausiids. S. leucopsarus showed little changes in composition of principal food categories between months, while T. crenularis and D. theta consumed more hyperiid amphipods in June, euphausiids in August, and salps in September. No feeding on salps was recorded in S. leucopsarus for the entire study period. All 3 species showed variation in feeding intensity, stomach fullness, state of digestion, and number of prey species and prey items per stomach. A divergence in feeding strategies of these co-occurring lanternfishes appears to reflect their structural morphology and generally conforms to an ecological subdivision of this midwater family into 'active' and 'inactive' species. Active myctophids (T. crenularis and D. theta) consumed significantly larger amounts of protein-rich prey such as euphausiids, hyperiid amphipods, and salps, while inactive S. leucopsarus showed higher preference for slower-moving, lipid-rich Neocalanus copepods. KEY WORDS:Myctophidae · Mesopelagic · Tarletonbeania crenularis · Diaphus theta · Stenobrachius leucopsarus · Feeding ecology · Ecomorphology · California Current Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 373: [81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96] 2008 Yamamura 2005). Myctophids represent an important trophic link between phytophagous zooplankton such as copepods and euphausiids and higher trophic level organisms such as salmon, tuna, seabirds, and marine mammals (see review in Brodeur & Yamamura 2005). They dominate the fish biomass in oceanic waters of the Northeast Pacific (Pearcy 1977, Gjøsaeter & Kawaguchi 1980, Beamish et al. 1999, and their transport onto continental shelves represents an important flux of energy into these systems, as represented in food web models of the California Current (Field et al. 2006).Three lanternfish species (Tarletonbeania crenularis, Stenobrachius leucopsarus, and Diaphus theta) form the bulk of micronekton fishes found in the NCC. These 3 species were reported to account for twothirds of all fishes collected in Isaac-Kidd midwater trawl tows in the upper 200 m off Oregon, USA (Pearcy 1964(Pearcy , 1977. Due to their high biomass and widespre...

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“…In fishes, niche breadths are commonly defined in terms of range of prey organisms found in the guts (Cohen & Lough, ) and are affected by several factors including food diversity (Layman et al ., ), competition (Svanback & Bolnick, ), seasonal changes in resource availability (Tanimata et al ., ) and environmental conditions (Laidre & Heide‐Jørgensen, ). As proposed by the ‘niche variation hypothesis’ (Van Valen, ), population niche breadths are constrained when exposed to strong interspecific competition and broadened when released from such competition and subjected only to intraspecific competition.…”

Section: Introductionmentioning

confidence: 99%

Diet and niche breadth variation in the marbled parrotfish,Leptoscarus vaigiensis, among coral reef sites in Kenya

et al. 2015

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Studies on feeding ecology of fishes are important for understanding ecosystem structure and function. This study tested the hypothesis of diet and niche breath variation in the marbled parrotfish (Leptoscarus vaigiensis) among coral reefs of different protection levels in Kenya. Fish samples were obtained from protected (Malindi and Watamu marine parks), moderately fished (Malindi and Watamu marine reserves) and highly fished (Vipingo and Kanamai) reefs. Total lengths of fish samples were measured and their stomach contents quantified using the point method. Seasonal dietary composition, niche breaths and feeding intensities were compared between the sites using multivariate statistics. Results showed the parrotfish is a predominantly reef macroalgal grazer. Fish from protected sites fed on diverse dietary items compared to those from reserves and highly fished sites. Fish niche breadths differed between sites and seasons. Higher niche breadths occurred in protected sites during the north‐east monsoon, while higher values occurred at fished sites during the south‐east monsoon season. This study, the first of its kind in Kenya and most of the western Indian Ocean, describes feeding in the marbled parrotfish and spatial variation in niche breadth as influenced by fishing pressure, environmental variability and biological interactions.

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Dietary shift and feeding intensity of Stenobrachius leucopsarus in the Bering Sea

Cited by 10 publications

References 30 publications

Temporal variation in chum salmon, Oncorhynchus keta, diets in the central Bering Sea in summer and early autumn

Temporal variation in chum salmon, Oncorhynchus keta, diets in the central Bering Sea in summer and early autumn

Trophic ecology of three dominant myctophid species in the northern California Current region

Diet and niche breadth variation in the marbled parrotfish,Leptoscarus vaigiensis, among coral reef sites in Kenya

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