Fluid dynamic constraints on resource acquisition in small pelagic organisms

Kiørboe, Thomas

doi:10.1140/epjst/e2015-50261-1

Cited by 18 publications

(16 citation statements)

References 101 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, dissolved nitrogen concentration was shown to influence the production of mannose located at the phytoplankton cell surface ( Martel, 2009 ), which is involved in the biorecognition processes ( Roberts et al., 2011 ; Wootton et al., 2007 ). Recent advances in plankton ecology indicate that prey may be perceived first mechanically, either remotely for motile prey, or with near-field perception for non-motile ones ( Goncalves and Kiørboe, 2015 ; Kiørboe, 2016 ; Tiselius et al., 2013 ). According to this body of literature, it is only after touching the prey, or having the prey very close to the copepod’s setae, that chemical sensing (gustation) could act.…”

Section: Discussionmentioning

confidence: 99%

A matter of time and proportion: the availability of phosphorus-rich phytoplankton influences growth and behavior of copepod nauplii

Meunier

Herstoff

Geisen

et al. 2020

Journal of Plankton Research

View full text Add to dashboard Cite

Although consumers may use selective feeding to cope with suboptimal resource quality, little work has examined the mechanisms that underlie selective feeding, the efficiency of this behavior or its influence on consumer growth rate. Furthermore, a consumer’s exposure to suboptimal resources may also influence the consumer’s behavior and life history, including growth rate. Here, we studied how the availability of P-rich and P-poor phytoplankton influences the growth and behavior of copepod nauplii. We observed that copepod nauplii preferentially feed on P-rich prey. We also found that even relatively short exposure to P-rich phytoplankton yielded higher nauplii growth rates, whereas the presence of P-poor phytoplankton in a mixture impaired growth. Overall, we observed that swimming speed decreased with increasing phytoplankton P-content, which is a behavioral adjustment that may improve utilization of heterogeneously distributed high-quality food in the field. Based on our results, we propose that the optimal prey C: P ratio for copepod nauplii is very narrow, and that deviations from this optimum have severe negative consequences for growth.

show abstract

Section: Discussionmentioning

confidence: 99%

A matter of time and proportion: the availability of phosphorus-rich phytoplankton influences growth and behavior of copepod nauplii

Meunier

Herstoff

Geisen

et al. 2020

Journal of Plankton Research

View full text Add to dashboard Cite

show abstract

“…One plausible explanation for such contradictory responses to nutritional conditions might be related to its omnivorous feeding habit (Williamson ; Šorf and Brandl ), considered apart from fish predation disturbances. Many copepods are omnivorous consumers that not only feed on phytoplankton but also actively select more nutritious preys, that is, detritus, ciliates, flagellates, and rotifers, if they chance to meet them in situ (Kiørboe ; Hu et al ). Lack of correlation between the biomass of calanoids and phytoplankton has been shown in 12 lakes in Canada (Pace ).…”

Section: Discussionmentioning

confidence: 99%

Planktivorous fish predation masks anthropogenic disturbances on decadal trends in zooplankton biomass and body size structure in Lake Biwa, Japan

Liu

Dur

Ban

et al. 2019

Limnology & Oceanography

View full text Add to dashboard Cite

Pelagic zooplankton samples from Lake Biwa, Japan, collected monthly since 1971, were analyzed for biomass and body size structure. Our aim was to clarify the relative effects of food availability and global warming vs. top‐down control by fish predation on long‐term trends. Annual mean biomass and density‐weighted body size were calculated and compared with water temperature, total phosphorus (TP), as a proxy of food amount, and catch per unit effort (CPUE) of Ayu (Plecoglossus altivelis altivelis), as a proxy of planktivorous fish predation pressure. Mean water temperature above 20 m increased by 0.94°C. TP increased until 1974 and then decreased until 1985, becoming stable after that. Ayu CPUE increased until 1987 and then declined. The study period can be divided into two nutritional phases: a high TP phase (1971–1985) and a low‐stable TP phase (1986–2010). Five zooplankton taxa, Eodiaptomus japonicus, Cyclopoida spp., Daphnia spp., Bosmina longirostris, and Diaphanosoma orientalis, were continuously dominant. Annual mean total crustacean biomass varied from 0.3 to 3.6 g dry weight m−2, slightly decreasing until 1993 but increasing thereafter. Generalized linear models showed that annual mean body sizes were affected by temperature and CPUE, whereas annual mean biomass was affected by TP and CPUE. These had no effect during the high TP phase, whereas only CPUE affected both traits during the low‐stable TP phase. We concluded that zooplankton biomass and body size long‐term trends were mostly influenced by fish predation and that eutrophication and global warming impacts might be affected by top‐down control.

show abstract

“…Two types of hydrodynamic effects that are difficult to describe in simple models affect encounter rates. Firstly, low Reynolds number flows at the planktonic microscale lead to repulsive disturbances that hinder direct predator-prey contact [2,22,23], and secondly small-scale turbulent flows in the aquatic environments may facilitate predator-prey encounters, but also sometimes make the prey more difficult to catch [5,11,24]. Repulsive disturbances are of significance, e.g.…”

Section: Discussionmentioning

confidence: 99%

Planktonic encounter rates with non-spherical encounter zones

Andersen

Dölger

2019

J. R. Soc. Interface.

View full text Add to dashboard Cite

We present general formulae for planktonic predator–prey encounter rates with encounter zones of convex shape and randomly moving point-like prey with ballistic motion. When the predator is not moving, we show that the encounter rate is independent of the shape of the encounter zone around it and proportional to the product of the surface area of the encounter zone and the prey speed. By contrast, the shape of the encounter zone plays a role when both the predator and the prey are moving. Slow predator motion results in only a weak increase of the encounter rate relative to the non-motile predator situation, but it may lead to a significant shift in where prey impact the surface of the encounter zone. By analysing disc-like and rod-like encounter zones with lengthwise and sideways motion, respectively, we show that fast predator motion may significantly influence the encounter rate, depending on the shape and the direction of motion of the encounter zone.

show abstract

Fluid dynamic constraints on resource acquisition in small pelagic organisms

Cited by 18 publications

References 101 publications

A matter of time and proportion: the availability of phosphorus-rich phytoplankton influences growth and behavior of copepod nauplii

A matter of time and proportion: the availability of phosphorus-rich phytoplankton influences growth and behavior of copepod nauplii

Planktivorous fish predation masks anthropogenic disturbances on decadal trends in zooplankton biomass and body size structure in Lake Biwa, Japan

Planktonic encounter rates with non-spherical encounter zones

Contact Info

Product

Resources

About