Feeding of Paddlefish, Polyodon spathula

Rosen, Rudolph A.; Hales, Donald C.

doi:10.2307/1444235

Cited by 94 publications

(68 citation statements)

References 36 publications

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“…Summer declines in Daphnia abundance in Lake Mendota (Luecke et al 1990) and Lake Erie (Wu & Culver 1994) were attributed to food limitation in early summer; however, despite the return of quality food resources in late summer, Daphnia abundance remained low due to fish predation. The consumption of crustacean zooplankton by fishes in riverine systems has been well documented (Rosen & Hales 1981 in Pool 4 of the Mississippi River, 22 (26%) have been reported to consume zooplankton as one of their primary diet items as adults (Simon 1999). Van Dijk and Van Zanten (1995) reported a similar food web in the Lower River Rhine where 30% of the fish community was zooplanktivorous.…”

Section: Zooplankton Community Patternsmentioning

confidence: 99%

Crustacean zooplankton dynamics in a natural riverine lake, Upper Mississippi River

Burdis

Hirsch

2017

Journal of Freshwater Ecology

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Zooplankton communities in riverine systems are typically thought to be driven by abiotic forces. However, recent studies have shown that biological controls are capable of structuring these communities in large rivers and may become more influential as a river system becomes more lentic during low discharge. This study uses a long-term data set to examine several environmental variables as potential drivers of zooplankton community structure in a natural riverine lake. We hypothesized that water residence time would be the most important variable influencing zooplankton community structure. To test this, we used non-metric multidimensional scaling and correlation analysis to examine spatial and temporal patterns in zooplankton community structure. Analysis revealed that water residence time was the single most important environmental variable driving zooplankton abundance and community structure. The relationship between water residence time and taxa groups varied indicating that other taxa specific drivers had some influence on zooplankton community structure as well. Continued insight into the mechanisms driving zooplankton community structure will provide a basis for understanding zooplankton dynamics in large river ecosystems.

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Section: Zooplankton Community Patternsmentioning

confidence: 99%

Crustacean zooplankton dynamics in a natural riverine lake, Upper Mississippi River

Burdis

Hirsch

2017

Journal of Freshwater Ecology

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“…The first type was prey swarm noise. A paddlefish such as the 35-to 50-cm fish that we studied, feeds by filtering: it swims forward, with its capacious mouth open, and filters from the water numerous 1-to 10-mm plankton, including the zooplankton Daphnia, a usual prey (Rosen and Hales 1981). The spatial distribution of Daphnia tends to be nonuniform, in patches.…”

Section: Natural Noises From Zooplankton Prey Elicit Afferent Burstsmentioning

confidence: 99%

Noise-Induced Transition to Bursting in Responses of Paddlefish Electroreceptor Afferents

Neiman¹,

Yakusheva²,

Russell³

2007

Journal of Neurophysiology

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Neiman AB, Yakusheva TA, Russell DF. Noise-induced transition to bursting in responses of paddlefish electroreceptor afferents. J Neurophysiol 98: [2795][2796][2797][2798][2799][2800][2801][2802][2803][2804][2805][2806] 2007. First published September 12, 2007; doi:10.1152/jn.01289.2006. The response properties of ampullary electroreceptors of paddlefish, Polyodon spathula, were studied in vivo, as single-unit afferent responses to external electrical stimulation with varied intensities of several types of noise waveforms, all Gaussian and zero-mean. They included broadband white noise, Ornstein-Uhlenbeck noise, low-or high-frequency band-limited noise, or natural noise recorded from swarms of Daphnia zooplankton prey, or from individual prey. Normally the afferents fire spontaneously in a tonic manner, which is actually quasiperiodic due to embedded oscillators. 1) Weak noise stimuli increased the variability of afferent firing, but it remained tonic. 2) In contrast, stimulation with less-weak broadband noise led to a qualitative change of the firing patterns, to parabolic bursting, even though the mean firing rate was scarcely affected.3) The transition to afferent bursting was marked by the development of two well-separated timescales: the fast frequency of spiking inside bursts at Յ250 spikes/s and the slow frequency of burst occurrences at about 9 (range 5-13) bursts/s. These two timescales were manifested as two regimes in afferent power spectra, bimodal interspike interval histograms, return maps, and autocorrelation functions of afferent spike trains. 4) The stochastic approximately 9-Hz bursts were not simply driven by similar-frequency components of noise stimuli because bursts could be dissociated from stimulus waveforms using high-pass filtered noise, or a 0.1-Hz sine-wave stimulus. 5) Arrhenius plots showed that the threshold noise intensity required to elicit bursting depended on the frequency content of a noise stimulus, being lowest, about 1.2 V/cm, for stimuli matching the 1-to 20-Hz best response band of these cathodally excited ampullary electroreceptors. This is only slightly higher than previous behavioral estimates of the electrosensory threshold as 0.5 V/cm. 6) Comparable threshold values for bursting came from an alternate analytical approach, based on correlation times of spike trains. 7) Simultaneous recordings from pairs of afferents showed that their bursting frequencies (bursts/s) always converged as the amplitude of a noise stimulus was raised. Thus the slow timescale of bursting is similar for different electroreceptors, even though their mean spiking rates can differ. In conclusion, the ampullary electroreceptors of paddlefish have two distinct modes of operation: their spontaneous tonic firing is modulated by the weakest stimuli, but they switch to bursting output for less-weak stimuli. We propose that afferent bursting may mediate close-range tracking of planktonic prey.

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“…In juvenile paddle"sh (typically(1 year of age and 120 mm in length), the gill rakers are as yet undeveloped, and consequently this form of "lter feeding is not available to them (Michaletz et al, 1982). They must rely on selecting individual Daphnia from the water column (Rosen & Hales, 1981).…”

Section: Daphnia Swarmsmentioning

confidence: 99%

“…Others have also observed that young paddle"sh tend to swim right through swarms of Daphnia without feeding unless an individual passes very close to the rostrum (Michaletz et al, 1982). Juvenile paddle"sh appear to actively seek and consume individual prey, especially of the genus Daphnia (Rosen & Hales, 1981;Michaletz et al, 1982). Other planktivorous "sh are also known to avoid feeding in dense patches of swimming prey, probably because of the confusion e!ect (see, for example, Milinski, 1986).…”

Section: Daphnia Swarmsmentioning

confidence: 99%

Behavioral Stochastic Resonance: How the Noise from a Daphnia Swarm Enhances Individual Prey Capture by Juvenile Paddlefish

Freund

Schimansky‐Geier

Beisner

et al. 2002

Journal of Theoretical Biology

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Feeding of Paddlefish, Polyodon spathula

Cited by 94 publications

References 36 publications

Crustacean zooplankton dynamics in a natural riverine lake, Upper Mississippi River

Crustacean zooplankton dynamics in a natural riverine lake, Upper Mississippi River

Noise-Induced Transition to Bursting in Responses of Paddlefish Electroreceptor Afferents

Behavioral Stochastic Resonance: How the Noise from a Daphnia Swarm Enhances Individual Prey Capture by Juvenile Paddlefish

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