Behavioural responses to chemical cues of predation risk in a three-trophic-level Baltic Sea food chain

Ejdung, Gunilla

doi:10.3354/meps165137

Cited by 20 publications

(16 citation statements)

References 38 publications

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“…Donner et al (1987) reported field observations of increased swimming by Monoporeia affinis as feeding conditions deteriorated in late summer, suggesting that food shortage can also cause emigration from the sediment. M. affinis has been reported to swim away from unfavourable conditions, such as the presence of toxic contaminants (Lindström & Lindström 1980), low oxygen (Johansson 1997) and predator presence (Ejdung 1998, Sparrevik & Leonardsson 1999. Amphipod mortality during the experiment was mostly 9 to 27%, but reached over 40% in some treatments.…”

Section: Tests Of Density-dependence Of Growth Ratesmentioning

confidence: 96%

Intraspecific food competition in the deposit-feeding benthic amphipod Monoporeia affinis-a laboratory study

Elmgren¹,

Ejdung²,

Ankar³

2001

Mar. Ecol. Prog. Ser.

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Section: Tests Of Density-dependence Of Growth Ratesmentioning

confidence: 96%

Intraspecific food competition in the deposit-feeding benthic amphipod Monoporeia affinis-a laboratory study

Elmgren¹,

Ejdung²,

Ankar³

2001

Mar. Ecol. Prog. Ser.

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“…The crush-limited C. maenas can break the globular BS Macoma more easily than the flatter NS Macoma of similar size. Saduria entomon pry the shell valves apart (Ejdung 1998), and eat more of the flat and lightshelled NS Macoma. Crangon crangon swallow small M. balthica whole, pry open the shell or make a hole in the shell to extract the meat.…”

Section: Influence Of Prey Type and Prey Sizementioning

confidence: 99%

“…Ultimately many species have the means to recognise prey and predators, and to find and avoid them (Busdosh et al 1982, Ejdung 1998. Today animals disperse more rapidly to new areas through artificial waterways (Olenin & Leppäkoski 1999), are introduced by humans, or shift their distribution due to global climate change.…”

Section: Introductionmentioning

confidence: 99%

Predation by crustaceans on native and non-native Baltic clams

Ejdung

Flach²,

Byrén³

et al. 2009

Aquat. Biol.

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We studied the effect of crustacean predators on native/non-native Macoma balthica bivalves in aquarium experiments. North Sea M. balthica (NS Macoma) were recently observed in the southern Baltic Sea. They differ genetically and in terms of morphology, behaviour and evolutionary history from Baltic Sea M. balthica (BS Macoma), and this may affect predation pressure and community structure. We hypothesised that predators consume more of the prey they co-exist with. NS Macoma and BS Macoma were exposed to crustacean predators common in the North Sea (Carcinus maenas and Crangon crangon) and in the Baltic Sea (C. crangon and Saduria entomon). Contrary to our hypotheses, the North Sea predators ate more BS Macoma, and S. entomon ate more NS Macoma. The crush-limited C. maenas preyed more on globular BS Macoma, whereas S. entomon, which do not crush but pry open the bivalve shell, ate more NS Macoma, which have a lighter (thus probably thinner) shell than BS Macoma. When NS and BS Macoma were offered together, BS Crangon ate more NS Macoma. We also studied BS Crangon consumption of M. balthica to assess whether sizes offered fall within the size spectrum that C. crangon can eat. Small (20 to 40 mm long), medium (40 to 50 mm) and large (50 to 60 mm) C. crangon especially ate small M. balthica. Differences in shape, size and meat/shell weight ratio between the BS and NS Macoma partly explained the differences in the susceptibility to predation by native and non-native predators.

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“…Similarly, single M. affinis had a higher radioactive uptake at C10.6 and C8.9 than did single P. femorata. Bioturbation (Cederwall 1979, Ejdung 1998) causes mixing of sediment particles in the upper 5 cm of the sediment (Lopez & Elmgren 1989), but is unlikely to have greatly mixed the sediment during our short-term experiments. The much lower uptake by P. femorata than by M. affinis in our experiments probably mainly represents evidence of surface feeding by subadult M. affinis as reported by Byrén et al (2002Byrén et al ( , 2006.…”

Section: Feedingmentioning

confidence: 99%

Uptake of diatoms in Baltic Sea macrozoobenthos during short-term exposure to severe and moderate hypoxia

Ejdung¹,

Byrén²,

Wiklund³

et al. 2008

Aquat. Biol.

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The effect of severe and moderate hypoxia on food uptake of benthic macrofauna was studied in the laboratory. The hypothesis was that low oxygen concentrations negatively affect feeding at oxygen levels that have little effect on the studied animals' survival. The bivalve Macoma balthica, the priapulid Halicryptus spinulosus, the amphipods Monoporeia affinis (subadult & juvenile) and Pontoporeia femorata (subadult) were offered the 14 C-labelled diatom Skeletonema costatum in 0.8 to 10.6 mg O 2 l -1 . Feeding was measured as radioactivity uptake. Subadult amphipods were studied one species at a time (single) or together (mixed). Feeding changed in all amphipods at the lowest oxygen concentrations, but no effect was found for M. balthica and H. spinulosus. At the lowest concentration (0.8 mg O 2 l -1 ) feeding by subadult M. affinis (single) was only 17% of the full oxygen saturation (10.6 mg O 2 l -1 ), and, at 1.6 mg O 2 l -1 , 14% of the feeding at 8.9 mg O 2 l -1 . Juvenile M. affinis consumed more labelled algae at 3 mg O 2 l -1 than at higher oxygen concentrations. M. balthica feeding was not affected. Little radioactivity uptake was registered for H. spinulosus at any oxygen concentration, showing that H. spinulosus is not a surface deposit feeder. The amphipods were the most sensitive to week-long oxygen deficiency. Survival decreased significantly in the lowest oxygen concentrations (0.8; 1.6 mg O 2 l -1 ). Of the subadult M. affinis 15 and 65%, respectively, survived, compared with 0 and 58% for P. femorata. Juvenile M. affinis mortality was high in all oxygen concentrations, whereas most M. balthica and H. spinulosus survived.KEY WORDS: Severe hypoxia · Moderate hypoxia · Macrobenthos · 14 C-uptake · Baltic SeaResale or republication not permitted without written consent of the publisher

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Behavioural responses to chemical cues of predation risk in a three-trophic-level Baltic Sea food chain

Cited by 20 publications

References 38 publications

Intraspecific food competition in the deposit-feeding benthic amphipod Monoporeia affinis-a laboratory study

Intraspecific food competition in the deposit-feeding benthic amphipod Monoporeia affinis-a laboratory study

Predation by crustaceans on native and non-native Baltic clams

Uptake of diatoms in Baltic Sea macrozoobenthos during short-term exposure to severe and moderate hypoxia

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