In situ observations of the association between juvenile fishes and scyphomedusae in the Bering Sea

Brodeur, Richard D.

doi:10.3354/meps163011

Cited by 81 publications

(46 citation statements)

References 20 publications

(32 reference statements)

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“…Studies like Mills et al (1996), Brodeur (1998) and Purcell et al (2000) serve as excellent examples of how propelled submersibles and ROVs are much better suited than our system for studying individual behavior and group interactions. Towed systems like ours are arguably better suited for the study of broad-scale distribution patterns of jellyfish than ROVs and submersibles that require careful maneuvering by the tending ship in order to traverse long horizontal distances.…”

Section: Comparison With Netsmentioning

confidence: 99%

“…ROVs provide the added benefit of increased time for study of gelatinous animals, but are typically limited to shallower depths than research submersibles (but see Steinberg et al 1994). Brodeur (1998) used an ROV to observe the association between fish and jellyfish in the Bering Sea, and Purcell et al (2000) recently used an ROV to study jellyfish aggregations and individual behavior in Prince William Sound, Alaska.…”

Section: Comparison With Netsmentioning

confidence: 99%

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In situ quantification and analysis of large jellyfish using a novel video profiler

Graham¹,

Martín²,

Martin³

2003

Mar. Ecol. Prog. Ser.

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Ecological studies involving large jellyfish have been limited by the inability of oceanographers to measure the abundance and distribution patterns of these highly aggregated animals at local scales. Conventional plankton nets are undesirable in these applications because they cannot sample volumes large enough to accurately determine jellyfish concentration, nor do they have adequate spatial resolution to account for the ubiquitous patchiness of most large jellies. Nets are also notorious for damaging the watery bodies of jellyfish. To overcome these problems, we have developed a video system for use in the in situ study of large jellyfish. The design of our JellyCam is easily replicated since it incorporates commercially available components within a frame designed to hold hydrographic instrumentation available at most marine laboratories. We present data sets from 2 occasions as a demonstration of the utility of the JellyCam. On one occasion, a vertical profile of medusae of Pelagia noctiluca revealed intense layering of these jellyfish at the pronounced halocline/pycnocline. Most jellyfish in this layer were swimming toward the surface, and it was hypothesized that retarded forward-swimming velocity at the halocline, due to salt retention in jellyfish, caused this accumulation. A separate 800 m long horizontal transect of Phyllorhiza punctata medusae revealed distinct concentrated bands of jellyfish associated with increased chlorophyll concentration. Concomitant hydrographic data from the JellyCam showed that accumulation of both jellyfish and chlorophyll was associated with a hydrographic front. These data sets demonstrate that this system is capable of the desired 2 m 3 resolution, which is adequate for the observation and quantification of jellyfish distributions around small-scale physical discontinuities (e.g. fronts and pycnoclines). A series of side-by-side comparisons with a conventional plankton trawl resulted in comparable measurements of large jellyfish (Aurelia aurita) concentrations. Though in situ videography by itself is a powerful tool for investigating jellyfish, its use in conjunction with conventional nets or other technologies, such as acoustics and self-propelled vehicles (e.g. remotely operated vehicles and submersibles), will provide the most comprehensive view of jellyfish distribution in 3 dimensions.

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Section: Comparison With Netsmentioning

confidence: 99%

Section: Comparison With Netsmentioning

confidence: 99%

In situ quantification and analysis of large jellyfish using a novel video profiler

Graham¹,

Martín²,

Martin³

2003

Mar. Ecol. Prog. Ser.

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“…The distribution of juvenile walleye pollock is usually associated with the thermocline at around 40 m in the Bearing Sea (Brodeur 1998, Schabetsberger et al 2000, Kokubun et al 2008. High densities of euphausiids occur epipelagically on the stratified side of the frontal region in the vicinity of St. George Island (Hunt et al 1996a, Schabetsberger et al 2000.…”

Section: Prey Distribution and Dive Depthmentioning

confidence: 99%

Foraging behavior of incubating and chick-rearing thick-billed murres Uria lomvia

Ito¹,

Takahashi²,

Kokubun³

et al. 2010

Aquat. Biol.

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The varying demands associated with egg incubation and chick-rearing are known to have a corresponding effect on the foraging behavior of seabirds. We deployed data loggers on incubating and chick-rearing thick-billed murres Uria lomvia to examine differences in their diving behavior and characteristics of habitats used for foraging. To compare diets of incubating and chickrearing birds we collected their stomach contents using a water offloading technique. We found that incubating birds performed longer foraging trips than chick-rearing birds (incubating: 19.0 ± 7.2 h; chick-rearing: 9.9 ± 5.6 h). Incubating birds foraged in the offshore stratified water masses (sea surface temperature [SST] > 9°C) and frequently dived to the depth of the thermocline (20 to 50 m). Chick-rearing birds spent more time foraging in the inshore, well-mixed water masses (SST < 8°C), and at depths > 60 m. Small juvenile walleye pollock Theragra chalcogramma, squid and euphausiids were the dominant prey of incubating and chick-rearing birds. Distributions of these small prey were commonly associated with the thermocline, while larger fish, which parents brought back to feed their chicks, were distributed below the thermocline. Results suggest that incubating murres mainly foraged at shallow depths near the thermocline with higher concentrations of small prey, while chick-rearing murres feed their chicks large prey caught on deep dives while feeding themselves on small prey caught on shallow dives.

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“…Young-of-the-year walleye pollock Theragra chalcogramma in Alaskan waters swim among the tentacles of Cyanea capillata and Chrysaora melanaster (van Hyning & Cooney 1974, Brodeur 1998. Brodeur (1998) used an ROV and observed up to 5 walleye pollock with C. capillata and up to 30 with C. melanaster at depths of 30 to 40 m during the day.…”

Section: Introductionmentioning

confidence: 99%

Aggregations of the jellyfish Aurelia labiata:abundance, distribution, association with age-0 walleye pollock, and behaviors promoting aggregation in Prince William Sound, Alaska, USA

Purcell¹,

Brown²,

Stokesbury³

et al. 2000

Mar. Ecol. Prog. Ser.

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Aurelia labiata medusae occurred in aggregations with hundreds to millions of jellyfish. The aggregations were widely distributed in inlets of Prince William Sound (PWS), Alaska. Aerial surveys of PWS in May to August in 1995August in , 1996August in , and 1997 showed marked interannual variation in the numbers of aggregations observed, from a minimum of 38 in 1997 to a maximum of 557 in 1996 Acoustic surveys showed that the aggregations extended from near-surface (0 to 5 m) to 15 m depth. Schools of young-of the-year walleye pollock Theragra chalcogramma were associated with A. labiata, both within and below the aggregations. All seine catches that contained juvenile pollock also contained jellyfish. Medusa swimming was analyzed from underwater videotapes in order to elucidate how aggregations might be formed and maintained. Medusae did not swim in circles in the aggregat i o n~. Medusae all swam vertically in the same direction, either up or down, in crowded parts of the aggregations, suggesting that they had become concentrated in flow features, like convergences, in the water column. Reduced swimming, due pnmarily to frequent collisions among medusae in the aggregation~, also may have caused the medusae to become concentrated. The potential advantages of aggregation include increased fertilization success, retention near shore where planula settlement sites and zooplankton prey may be more abundant, retention in convergences where zooplankton are concentrated, and reduced predation.

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In situ observations of the association between juvenile fishes and scyphomedusae in the Bering Sea

Cited by 81 publications

References 20 publications

In situ quantification and analysis of large jellyfish using a novel video profiler

In situ quantification and analysis of large jellyfish using a novel video profiler

Foraging behavior of incubating and chick-rearing thick-billed murres Uria lomvia

Aggregations of the jellyfish Aurelia labiata:abundance, distribution, association with age-0 walleye pollock, and behaviors promoting aggregation in Prince William Sound, Alaska, USA

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