Ontogenetic and Temporal Shifts in the Diet of the Amphipod Gammarus fasciatus, in the Ohio River

Summers, Rebecca; Thorp, James H.

doi:10.2307/2426852

Cited by 25 publications

(15 citation statements)

References 16 publications

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“…larvae outside of their tubes (Hershey 1987). Tubeless chironomids in this study represented other free living, soft-bodied and ubiquitous freshwater macro-invertebrates, such as simulid larvae and/or oligochetes, which are also readily consumed by amphipods (Summers et al 1997;Boets et al 2010). In this sense, functional responses towards tubeless Chironomus sp.…”

Section: Discussionmentioning

confidence: 97%

Predicting the predatory impacts of the “demon shrimp” Dikerogammarus haemobaphes, on native and previously introduced species

et al. 2014

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Biological invasions continue to exert pressure on ecosystems worldwide and we thus require methods that can help understand and predict the impacts of invasive species, on both native species and previously established invaders. Comparing laboratory derived functional responses among invasive and native predators has emerged as one such method, providing a robust proxy for field impacts. We used this method to examine the likely impacts of the Ponto-Caspian amphipod Dikerogammarus haemobaphes, known as the ''demon shrimp'', a little investigated invader in European freshwaters that has recently established in the British Isles. We compared the functional responses on two prey species of D. haemobaphes with two other amphipod species: Dikerogammarus villosus, a congeneric invasive with well-documented impacts on macro-invertebrate communities and a native amphipod, Gammarus pulex. Prey species were native Chironomus sp. and the invasive Chelicorophium curvispinum, a tubebuilding amphipod also originating from the PontoCaspian region. D. villosus showed higher Type II functional responses towards both prey species than did D. haemobaphes and G. pulex, with the latter two predators exhibiting similar impacts on the native prey. However, D. haemobaphes had higher functional responses towards the invasive C. curvispinum than did G. pulex, both when prey individuals were tubeless and resident in their protective mud tubes. Thus, we demonstrate that functionally equivalent invasive congeners can show significantly different impacts on prey, regardless of shared evolutionary history. We also show that some predatory invaders can have impacts on native prey equivalent to native predator impacts, but that they can also exert significant impacts on previously introduced prey. We discuss the importance of invasion history and prey identity when attempting to understand and predict the impacts of new invaders.

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Section: Discussionmentioning

confidence: 97%

Predicting the predatory impacts of the “demon shrimp” Dikerogammarus haemobaphes, on native and previously introduced species

et al. 2014

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“…Nonetheless, other causative mechanisms -e.g. ontogenetic trophic shifts, as described for Gammarus fasciatus (Summers et al 1997) -cannot be excluded.…”

Section: Discussionmentioning

confidence: 98%

Cascading effects of predatory fish exclusion on the detritus-based food web of a lake littoral zone (Lake Vico, central Italy)

2002

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An exclosure experiment was carried out in the reed-dominated littoral zone of a volcanic lake (Lake Vico, central Italy) to test whether the impact of predatory fish on benthic invertebrates cascades on fungal colonisation and breakdown of leaf detritus. The abundance, biomass, and Shannon diversity index of the invertebrate assemblage colonising Phragmites australis leaf packs placed inside: (1) full-exclosure cages, (2) cages allowing access only to small-sized fish predators, and (3) cageless controls, were monitored over a 45-day period together with the mass loss and associated fungal biomass of leaf packs. The species composition of the fungal assemblage was further assessed at the end of the manipulation. In general, invertebrate predators did not show any significant response to fish exclusion, either on a trophic guild or on a single taxon level. In contrast, the exclusion of large predatory fish induced a diverse spectrum of changes in the abundance and population size-structure of dominant detritivore taxa, ultimately increasing the biomass and Shannon diversity index of the whole detritivorous guild. These changes corresponded with significant variations in leaf detritus decay rates as well as in the biomass and assemblage structure of associated fungal colonisers. Our experimental findings provide evidence that in Lake Vico effects of fish predators on invertebrate detritivores influence the fungal conditioning and breakdown of the detrital substrate. We conclude that in lacustrine littoral zones predator-driven constraints may structure lower trophic levels of detritus-based food webs and affect the decomposition of leaf detritus originated from the riparian vegetation.

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“…Biomass of invertebrates per unit of epiphyton biomass was significantly higher on submerged plants and metaphyton than on emergent plants. Metaphyton can be a food resource for at least some invertebrates (Summers et al, 1997). Both submerged vegetation and floating algal mats can collect drifting invertebrates and offer potential refuge from fish predation (Jeppesen et al, 1998), thus representing a substratum suitable for sustaining high invertebrate biomass, independently of epiphyton colonization.…”

Section: Taxonmentioning

confidence: 99%

Invertebrate communities and epiphytic biomass associated with metaphyton and emergent and submerged macrophytes in a large river

et al. 2007

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The contribution of metaphyton and submerged and emergent macrophytes as support to phytophilous organisms was compared from the standpoint of epiphytic chlorophyll and of invertebrate biomass, taxonomic composition and size distribution. This study was carried out in a fluvial lake of the St. Lawrence River (Lac Saint-Pierre, QuØbec) at 5 sites with chemically and physically distinct water masses. Invertebrate and epiphyton biomass were consistently higher in complex filamentous mats (overall mean: 61 AE 5 [SE] mg and 124 AE 18 mg Chl a /g vegetation dry mass, respectively) and submerged plants (overall mean: 48 AE 7 mg and 195 AE 56 mg Chl a /g vegetation d.m.) than in the simple emergent stems (overall mean: 4 AE 1 mg and 45 AE 15 mg Chl a /g vegetation d.m.). Taxonomic composition of the invertebrate communities varied largely among types of vegetation and sites. Sampling site (and hence water physical and chemical characteristics) explained a larger fraction of the variation in invertebrate composition (28 %) than vegetation type (9 %). Overall, metaphyton hosted an invertebrate fauna more abundant and more diverse, with larger organisms and more semi-aquatic taxa, than that of nearby vascular macrophytes. However, at the scale of this river segment (~300 km 2 ), metaphyton contributed < 1 % to total phytophilous invertebrate biomass compared to 96 % and 4 % for submerged and emergent plants, respectively. In the river trophic network, vascular plants thus appear to support the bulk of the food supply, which is periodically enriched and diversified by the appearance of metaphyton blooms.

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Ontogenetic and Temporal Shifts in the Diet of the Amphipod Gammarus fasciatus, in the Ohio River

Cited by 25 publications

References 16 publications

Predicting the predatory impacts of the “demon shrimp” Dikerogammarus haemobaphes, on native and previously introduced species

Predicting the predatory impacts of the “demon shrimp” Dikerogammarus haemobaphes, on native and previously introduced species

Cascading effects of predatory fish exclusion on the detritus-based food web of a lake littoral zone (Lake Vico, central Italy)

Invertebrate communities and epiphytic biomass associated with metaphyton and emergent and submerged macrophytes in a large river

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