Effect of vertical mixing on the vertical distribution of copepods in coastal waters

Lagadeuc, Yvan; Bouté, M.; Dodson, Julian J.

doi:10.1093/plankt/19.9.1183

Cited by 62 publications

(53 citation statements)

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“…Evidence is inconclusive because of the dispersive effect of turbulence (Haury et al 1990), which could explain the deepening of the average depth of their distribution. It is also in disagreement with the observations by Lagadeuc et al (1997), who reported that Oithona similis exhibited the same vertical distribution in stratified and unstratified water columns.…”

Section: Acknowledgmentscontrasting

confidence: 99%

“…For instance, foraging theory would predict that an optimal predator would attempt to be located at those turbulence intensities where the most benefit can be obtained, selecting best depth strata. The vertical distribution of Oithona in the studies of Incze et al (2001) and Visser et al (2001) appears to conform to this behavior (but see Lagadeuc et al 1997), as our results indicate.…”

Section: Discussionsupporting

confidence: 73%

“…Presently, direct empirical evidence has been demonstrated for only two similarly sized, related genera of copepods-Acartia (e.g., Saiz et al 1992;Saiz and Kiørboe 1995) and Centropages (Caparroy et al 1998)-which responded similarly to turbulence. On the contrary, Lagadeuc et al (1997) reported that the vertical distribution of several copepod species was affected differently by mixing, suggesting species-specific responses to turbulence.…”

Section: Acknowledgmentsmentioning

confidence: 98%

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Effects of small‐scale turbulence on copepods: The case of Oithona davisae

Saiz

Calbet

Broglio

2003

Limnology & Oceanography

121

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We report the effects of small-scale turbulence on the feeding rates of the marine copepod Oithona davisae. Laboratory experiments were conducted under a range of turbulence dissipation rates between 10 Ϫ4 and 10 1 cm 2 s Ϫ3 . Net enhancements of feeding were observed only at the lowest, whereas negative net effects appeared only at the highest, turbulence intensities. These results contrast with expectations from an encounter-based model for this copepod species that predicted positive feeding enhancements at all turbulence intensities. This disagreement suggests the presence of detrimental effects at moderate and high turbulence intensities, very likely driven by either a lower mechanosensor perception capability or lower capture success. In comparison to other ambush copepods, O. davisae appears much more sensitive to the presence of turbulence, which might be the result of its strict ambush behavior, whereas copepods like Acartia tonsa or Centropages typicus, which can switch into different feeding modes, appear to benefit more from turbulence. The response of O. davisae feeding to turbulence in our experiments agrees with recent field observations on changes in the vertical distribution of Oithona as a function of wind-driven turbulence events. Hence, O. davisae seems to choose those depths where small-scale turbulence favors feeding.

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Section: Acknowledgmentscontrasting

confidence: 99%

Section: Discussionsupporting

confidence: 73%

Section: Acknowledgmentsmentioning

confidence: 98%

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Effects of small‐scale turbulence on copepods: The case of Oithona davisae

Saiz

Calbet

Broglio

2003

Limnology & Oceanography

121

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“…Unfortunately, of the many reports of copepod vertical distributions, only few consider naupliar stages, and even fewer separate nauplii into species or stages (e.g. Lagadeuc et al 1997, Durbin et al 2000, Incze et al 2001). This contrasts with the fact that nauplii make up the numerical bulk of copepods.…”

Section: Introductionmentioning

confidence: 99%

Ontogenetic vertical distribution patterns in small copepods: field observations and model predictions

Titelman

Fiksen²

2004

Mar. Ecol. Prog. Ser.

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We investigated fine-scale (5m, 4h) species-and stage-specific (N1 to C6) distributions of common copepods at an anchor station in a Swedish fjord during two 24 h periods in October 1997. Generally, both calanoid and cyclopoid nauplii were found near the surface, while copepodids stayed deeper in the water column. No diurnal migration was observed. To analyze the observed distributions, we combined mechanistic models of predation risk from fish and copepods, formulations of temperature-dependent growth and a habitat optimization model, maximizing expected lifetime reproductive output. Motility pattern has implications for encounter rates with copepod predators, and therefore affected optimal vertical positioning in the model. By applying species-and stagespecific motility, and accounting for the ambient copepod predator field, we computed depth profiles of the mortality risk for the observed field situation. Predicted diel and ontogenetic vertical distribution patterns for various levels of fish concentrations were compared with observed distributions, and much of the patterns in the field were explained by the model. While the risk of fish predation governs the deeper habitat selection of the larger copepodids, the risk of copepod predation is probably more important for nauplii and small copepods. In addition, the vertically homogeneous growth profile and dense layers of copepod predators may wipe out potential benefits of diurnal migration.

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“…Since turbulence may cause both fish larvae (Olla & Davis 1990, Kendall et al 1994 (Table 3, Model C). In model predictions, interacting covariates span their entire range, while all other covariates (not shown) retain their mean value; prey gut: predicted NPG 1996) and the developmental stages of copepods (Lagadeuc et al 1997, Incze et al 2001 to dwell deeper in the water column, one effect of turbulence may be the concentration of both predators and prey in deeper waters. This has been hypothesized by Franks (2001) in a modeling study that concluded that turbulenceavoidance behavior can lead to significant increases in predator-prey concentrations below the mixed layer.…”

Section: Discussionmentioning

confidence: 99%

Environmental factors influencing larval walleye pollock Theragra chalcogramma feeding in Alaskan waters

Porter

Ciannelli²,

Hillgruber³

et al. 2005

Mar. Ecol. Prog. Ser.

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This study examines potential interactions among the environmental variables likely to affect larval walleye pollock Theragra chalcogramma feeding in the sea. Walleye pollock larvae were sampled from Shelikof Strait, Gulf of Alaska, and from the eastern Bering Sea, with corresponding environmental data. Variables used in our study were time spent feeding, seawater temperature, light, prey density, wind speed and standard length of the larvae. We applied an additivity test to detect the presence of potential interactions among these variables and adopted an expansion of generalized additive models (GAMs) that allowed the inclusion of interaction terms in a non-parametric regression analysis. After testing all possible 2-way interactions among these variables, we found 4 significant terms: (1) time feeding-standard length, (2) temperature-light, (3) light -wind speed and (4) prey density-standard length. The most influential interaction term was the light -wind speed interaction, which caused a decrease of the model-generalized cross-validation (GCV, whereby lower values indicate more parsimonious models) from 0.0402 (for a model with all variables but no interaction term) to 0.0290 (for a model with all variables and this interaction), and an increase of the model explained variance by 7% (R 2 = 0.89 versus 0.82). This result indicates that the effect of wind speed (turbulence) on larval walleye pollock feeding is dependent upon the amount of light available. This may be due to vertical movements in the water column by both walleye pollock larvae and their prey in response to turbulence. KEY WORDS: Larval fish feeding · Walleye pollock larvae · Generalized additive models Resale or republication not permitted without written consent of the publisher

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Effect of vertical mixing on the vertical distribution of copepods in coastal waters

Cited by 62 publications

References 0 publications

Effects of small‐scale turbulence on copepods: The case of Oithona davisae

Effects of small‐scale turbulence on copepods: The case of Oithona davisae

Ontogenetic vertical distribution patterns in small copepods: field observations and model predictions

Environmental factors influencing larval walleye pollock Theragra chalcogramma feeding in Alaskan waters

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