Trophodynamics of two interacting species of estuarine mysids, Praunus flexuosus and Neomysis integer, and their predation on the calanoid copepod Eurytemora affinis

Winkler, Gesche; Greve, Wulf

doi:10.1016/j.jembe.2004.02.017

Cited by 25 publications

(15 citation statements)

References 47 publications

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“…In contrast, Neomysis americana may be characterised primarily as a filter feeder preying opportunistically on the most available prey, veligers, rotifers and nauplii, confirming observations of filter feeding on nauplii by mysids (Cooper & Goldman 1980, Aaser et al 1995, and in accordance with models of optimal foraging behaviour described for other mysid species such as Mysis relicta (Grossnickle 1982), Praunus flexuosus (Viitasalo & Rautio 1998, Winkler & Greve 2004 and Mesopodopsis slabberi (Webb et al 1987). No comparable predation rates on rotifers and veligers are available, but high predation pressure on rotifers by Neomysis intermedia was found in a shallow eutrophic lake in Japan (Hanazato 1990).…”

Section: Contrasting Foraging Strategies Of Mysis Stenolepis and Neomsupporting

confidence: 83%

“…Wooldridge & Webb 1988, Aaser et al 1995, Jerling & Wooldridge 1995, Mohammadian et al 1997, Viitasalo & Rautio 1998, Winkler & Greve 2004. As the prey density decreased over the experimental period, we calculated average prey density (PD, ind.…”

Section: Methodsmentioning

confidence: 99%

“…This approach has its limitations: stomach content analysis shows ingested food and the relative proportion of each item ingested, but underestimates easily digested items, such as soft-bodied rotifers, and no estimates of ingestion rates are possible. Ingestion rates can, however, be assessed by feeding experiments designed to define functional responses to predator size, prey size and prey density (Webb et al 1987, Wooldridge & Webb 1988, Winkler & Greve 2004, but these studies typically involve 1 or 2 prey (Fulton 1982, Gorokhova & Hansson 1997, Viitasalo & Rautio 1998, Viherluoto & Viitasalo 2001a, which severely limits interpretation within a complex food web. Interactions among different prey types as a function of their abundance, size and escape behaviour may play an important role in determining the predation rate on each individual species in their natural environment.…”

Section: Introductionmentioning

confidence: 99%

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Trophic dynamics of two sympatric mysid species in an estuarine transition zone

Winkler¹,

Martineau²,

Dodson³

et al. 2007

Mar. Ecol. Prog. Ser.

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The feeding ecology of 2 sympatric mysid species within the food web of the St. Lawrence Middle Estuary was studied to determine their trophic position and potential mechanisms of coexistence. These abundant predators were clearly distinguished by differences in foraging behaviour. In feeding experiments involving multi-prey assemblages, predation and ingestion rates of Mysis stenolepis were greater than for Neomysis americana, except for small prey. M. stenolepis showed highest predation rates on and preference for Eurytemora affinis nauplii and copepodites, and did not feed on the most abundant prey, the veliger stage of the zebra mussel Dreissena polymorpha. In contrast, N. americana showed highest predation rates on and preference for small prey species such as rotifers, nauplii and veligers. When densities of preferred prey declined in the second half of the experiment, both mysid species showed a shift in predation towards the less preferred prey. M. stenolepis switched to filter feeding, with higher predation rates on veligers, whereas N. americana increased predation on small E. affinis copepodites. Stable isotope analysis and feeding experiments suggested 3 trophic levels in the food web, with a high degree of omnivory. The δ 13 C values for the 2 mysid species were similar and supported by the same carbon source, mostly of autochthonous origin. However, their δ 15 N differed significantly by 2.2 ‰, indicating that the composition of their diet differed in terms of ingested and assimilated food items. These results suggest that co-existence of the sympatric mysid populations is achieved by reduced competition due to foodniche partitioning. Flexibility in their foraging behaviour allowed mysids to exploit multiple prey groups that undergo temporal and spatial fluctuations in the highly dynamic estuarine transition zone of the St. Lawrence Middle Estuary.

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Section: Contrasting Foraging Strategies Of Mysis Stenolepis and Neomsupporting

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Trophic dynamics of two sympatric mysid species in an estuarine transition zone

Winkler¹,

Martineau²,

Dodson³

et al. 2007

Mar. Ecol. Prog. Ser.

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“…food. N. integer and P. flexuosus are shown to compete for the same food resource Eurytemora affinis copepods (Winkler & Greve, 2004). When food resources are scarce or specimens numerous co-occurrence causes a need to differentiate in the food utilisation to decrease competition (Fulton, 1982;Fenton, 1996;Kiljunen et al, 2006).…”

Section: Diets Of Different Speciesmentioning

confidence: 99%

Feeding differences among common littoral mysids, Neomysis integer, Praunus flexuosus and P. inermis

Lehtiniemi¹,

Nordström²

2008

Hydrobiologia

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The energy flow in aquatic food webs and their structures are largely determined by food utilisation of predators. Mysid shrimps are important predators in various aquatic ecosystems. We studied the stomach contents of three common littoral mysids from the Baltic Sea. The aim was to study whether the diets differ between species and size classes inhabiting shallow coastal areas. The effects of season (spring, summer, autumn) and habitat were also explored. Results showed that all species were highly omnivorous, utilising various phyto-and zooplankton prey, algal filaments and dead organic material through the growing season. No ontogenetic diet shifts were observed although different size classes preferred slightly different prey. The amount of detritus increased in the diets during growth. In addition, large mysids ate more macro-and less microzooplankton compared with the small ones. There were also speciesspecific differences in the food utilisation. Neomysis integer ate more benthic material, Praunus flexuosus more macrozooplankton and P. inermis more phytoplankton compared with the others. These differences reflect microhabitat differences and probably also size differences of the studied species. Seasonal variation was also observed in the diets. Food utilisation followed the changes in the food availability, e.g. phytoplankton spring bloom and zooplankton peak abundances in late summer. Results confirm the omnivorous nature of mysids showing the importance of a diversity of prey as energy sources during growth.

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“…In terrestrial, freshwater and temperate marine ecosystems, predator size has been shown to play an important role in regulating prey communities (Radloff & Du Toit 2004, Winkler & Greve 2004, Langlois et al 2006, Magnusson & Williams 2009, Perez et al 2009). Consequently, the removal of differentsized predators would be expected to differently affect community structure and composition.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Body Size on the Ecology of Coastal Fish Predators in The Bahamas

Hammerschlag-Peyer¹

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Trophodynamics of two interacting species of estuarine mysids, Praunus flexuosus and Neomysis integer, and their predation on the calanoid copepod Eurytemora affinis

Cited by 25 publications

References 47 publications

Trophic dynamics of two sympatric mysid species in an estuarine transition zone

Trophic dynamics of two sympatric mysid species in an estuarine transition zone

Feeding differences among common littoral mysids, Neomysis integer, Praunus flexuosus and P. inermis

The Influence of Body Size on the Ecology of Coastal Fish Predators in The Bahamas

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