Acoustic Analysis of Diel Vertical Migration Behavior of <i>Mysis relicta</i> and Kokanee (<i>Oncorhynchus nerka</i>) within Okanagan Lake, British Columbia

Levy, David A.

doi:10.1139/f91-010

Cited by 53 publications

(40 citation statements)

References 13 publications

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“…Acoustic echograms of mysids in Okanagan Lake from a 150 m deep station showed that a large portion of the population remained at between 100 and 120 m during the day (Levy 1991), which would reduce potential feeding time on sediment detrital organic matter. Although mysids in both lakes were restricted to > 50 m depth after sunrise (Whall 2000), it is not known what proportions of the population were located at the sediment -water interface.…”

Section: Food Sources Of Mysis Diluvianamentioning

confidence: 99%

Differences in the trophic role of Mysis diluviana in two intermontane lakes

Whall¹,

Lasenby²

2009

Aquat. Biol.

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The trophic role of the freshwater shrimp Mysis diluviana was compared between 2 neighbouring lakes in British Columbia to investigate its possible role in the collapse of the Okanagan Lake kokanee salmon Oncorhynchus nerka population. Stable isotopes of nitrogen (δ 15 N) and carbon (δ 13 C) were used to compare the trophic relationships of mysids within the pelagic food web and between lakes. Mid-summer δ 15 N signatures suggested that adult mysids in Okanagan Lake were acting more as primary consumers, and Kalamalka Lake mysids were acting as secondary consumers. M. diluviana's predatory capacity was also assessed through in situ clearance rate feeding experiments and examination of gut contents. M. diluviana <1 yr old in Okanagan Lake were capable of clearing a greater volume of prey, but there was no difference between lakes for M. diluviana >1 yr old. Gut contents confirmed M. diluviana in both lakes were consuming copepod and cladoceran prey. All 3 techniques demonstrated ontogenetic diet shifts, with larger mysids obtaining more energy from zooplankton prey. Although mysids in feeding experiments actively consumed the same zooplankton prey as kokanee, δ 15 N and δ 13 C ratios suggest that mysids in Okanagan Lake were not feeding at the same trophic level as kokanee, which indicates that there may have been less competition for food sources than previously thought. These differences in results suggest that predatory capacity, as indicated by in situ feeding experiments or gut content analysis, should not be used in isolation to establish trophic roles for omnivorous animals.

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Section: Food Sources Of Mysis Diluvianamentioning

confidence: 99%

Differences in the trophic role of Mysis diluviana in two intermontane lakes

Whall¹,

Lasenby²

2009

Aquat. Biol.

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“…5B), is thought to be caused by dense aggregations of small zooplankton and/or phytoplankton cells containing gas vacuoles. Although individual planktonic organisms such as Mysis and Chaoborus can be detected by high-frequency echosounders (Northcote 1964;Unger & Brandt 1989;Levy 1991), this is because they are relatively large organisms with either hard exoskeletons or gas-filled hydrostatic organs that reflect sound. However, these species are not present in New Zealand lakes, and the zooplankters or phytoplankton cells that are present are too small to be individually detected, even by high-frequency echosounding.…”

Section: Identification Of Echoesmentioning

confidence: 99%

Identification of fish responsible for five layers of echoes recorded by high‐frequency (200 kHz) echosounding in Lake Rotoiti, North Island, New Zealand

Rowe

1993

New Zealand Journal of Marine and Freshwater Research

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Layers of echoes, segregated by depth, were recorded by high-frequency (200 kHz) echosounding in several lakes near Rotorua, New Zealand. The fish species responsible for the echo layers in Lake Rotoiti are identified. Schools of 1 + -year-old smelt (Retropinna retropinna) produced a band of spike-like echoes between 2 and 10 m depth. Below this layer, larval bullies (Gobiomorphus cotidianus) produced a second, scattering-type layer. A third layer of echoes, below the scattering layer, was produced by 2 + -year-old smelt. Smaller fish were responsible for a deeper, fourth layer of echoes, apparent only in Lake Rotoiti, but the actual species or life history stage was not identified. Echoes within 5 m of the lake bottom at depths over 40 m comprised a fifth layer and were caused mainly by adult koaro (Galaxias brevipinnis). Echoes from trout (Oncorhynchus mykiss), from schools of smelt in Layers 1 and 3, and from adult koaro were of a similar amplitude. As acoustic surveys of trout density will depend on identification of trout from the size of their echoes, such surveys should be carried out at times when smelt are not schooling and when adult koaro are scarce.

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“…Diel vertical migration (DVM), a common and important migration pattern in many animal taxa (Bollens 1996;Wetzel 2001), has been observed in numerous zooplankton species in lakes and reservoirs (Levy 1991;Loose & Dawidowicz 1994;Ghan et al 1998;De Robertis & Jaffe 2000). DVM is commonly undertaken to increase energy gain from feeding while decreasing the probability of death from predation (Gabriel & Thomas 1988;Bollens 1996;Ghan et al 1998).…”

Section: Introductionmentioning

confidence: 99%

“…Zooplankton may migrate to deeper, less productive waters during the day, avoiding visual predators, and ascend to food-rich surface waters to feed at night. The distance of zooplankton DVM can range from a few meters to more than 100 m (Levy 1991;Stewart & Sutherland 1993).…”

Section: Introductionmentioning

confidence: 99%

Distribution, abundance, and vertical migrations ofLeptodora kindtiiin a mainstem Missouri River reservoir, Montana, USA

Bowersox

Scarnecchia

Miller

2013

Journal of Freshwater Ecology

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Leptodora kindtii, a large, mobile, predaceous cladoceran zooplankter has been shown to make diel vertical migrations in some localities. L. kindtii were sampled in summer in the headwaters of Fort Peck Reservoir, Montana, USA, to assess and compare their day/night abundance in three habitat types (riverine, transitional, and reservoir), to determine if L. kindtii mean size and abundance differed vertically and horizontally, and to determine if their distribution differed under different turbidities and water temperatures. L. kindtii were sampled in six periods from 22 July to 10 September 2002 using a bongo net towed at set depths. Abundance displayed a patchy, highly variable distribution among periods and habitat types and among samples within periods and habitat types. Greatest abundances were found within the reservoir habitat type. Diurnal phase was not significantly related to L. kindtii abundance at depth. Highest daytime abundances were found at 1.25 m or deeper for five of six sample periods. Highest nighttime abundances were found at 1.25 m or deeper in three of the six sample periods. Significant interaction was found between diurnal phase and depth in five of six periods. In general, higher L. kindtii abundance was observed in association with higher water temperatures and lower turbidities.

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Acoustic Analysis of Diel Vertical Migration Behavior of Mysis relicta and Kokanee (Oncorhynchus nerka) within Okanagan Lake, British Columbia

Cited by 53 publications

References 13 publications

Differences in the trophic role of Mysis diluviana in two intermontane lakes

Differences in the trophic role of Mysis diluviana in two intermontane lakes

Identification of fish responsible for five layers of echoes recorded by high‐frequency (200 kHz) echosounding in Lake Rotoiti, North Island, New Zealand

Distribution, abundance, and vertical migrations ofLeptodora kindtiiin a mainstem Missouri River reservoir, Montana, USA

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