scholarly journals The Braveheart amphipod: a review of responses of invasive Dikerogammarus villosus to predation signals

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5311 ◽  
Author(s):  
Łukasz Jermacz ◽  
Jarosław Kobak
Keyword(s):  
Recognition System ◽  
Invasion Success ◽  
Predator Species ◽  
Dikerogammarus Villosus ◽  
Indirect Predator Effects ◽  
High Flexibility ◽  
Invasive Amphipod ◽  
Predator Effects ◽  
Predator Signals ◽  
Behavioural Adaptations

Predator pressure is a fundamental force driving changes at all levels of the community structure. It may protect native ecosystems from alien species. Therefore, resistance to diverse predators resulting from a universal anti-predator strategy seems crucial for invasion success. We present a comprehensive review of the responses of an invasive amphipod Dikerogammarus villosus to sympatric and allopatric predator signals. We summarize diverse aspects of the gammarid anti-predator strategy, including predator identification, morphological and behavioural adaptations, effectiveness of shelter use and resistance to indirect predator effects. The response of D. villosus is independent of predator species (including totally allopatric taxa), which assures the high flexibility of its predator recognition system. It has a harder exoskeleton and better capability of utilizing shelters compared to other gammarids, resulting in relatively high resistance to predators. Therefore, it can use predator kairomones as indirect food signals (sharing the diet with the predator) and follow the predator scent. This resistance may allow D. villosus to reduce the costs of its physiological responses to predators and sustain growth in their presence. This might facilitate invasion success by increasing its competitive advantage.

scholarly journals The Braveheart amphipod: A review of responses of invasive Dikerogammarus villosus to predation signals

2018 ◽  
Author(s):  
Łukasz Jermacz ◽  
Jarosław Kobak
Keyword(s):  
Recognition System ◽  
Invasion Success ◽  
Predator Species ◽  
Dikerogammarus Villosus ◽  
Behavioral Adaptations ◽  
Indirect Predator Effects ◽  
High Flexibility ◽  
Invasive Amphipod ◽  
Predator Effects ◽  
Predator Signals

Predator pressure is a fundamental force driving changes at all levels of the community structure. It may protect native ecosystems from alien species. Therefore, resistance to diverse predators resulting from a universal anti-predator strategy seems crucial for invasion success. We present a comprehensive review of the responses of an invasive amphipod Dikerogammarus villosus to sympatric and allopatric predator signals. We summarize diverse aspects of the gammarid anti-predator strategy, including predator identification, morphological and behavioral adaptations, effectiveness of shelter use and resistance to indirect predator effects. The response of D. villosus is independent of predator species (including totally allopatric taxa), which assures the high flexibility of its predator recognition system. It has harder exoskeleton and better capability of utilizing shelters compared to other gammarids, resulting in relatively high resistance to predators. Therefore, it can use predator kairomones as indirect food signals (sharing the diet with the predator) and follow the predator scent. This resistance may allow D. villosus to reduce the costs of its physiological responses to predators and sustain growth in their presence. This might facilitate the invasion success by increasing its competitive advantage.

scholarly journals The Braveheart amphipod: A review of responses of invasive Dikerogammarus villosus to predation signals

2018 ◽  
Author(s):  
Łukasz Jermacz ◽  
Jarosław Kobak
Keyword(s):  
Recognition System ◽  
Invasion Success ◽  
Predator Species ◽  
Dikerogammarus Villosus ◽  
Behavioral Adaptations ◽  
Indirect Predator Effects ◽  
High Flexibility ◽  
Invasive Amphipod ◽  
Predator Effects ◽  
Predator Signals

Predator pressure is a fundamental force driving changes at all levels of the community structure. It may protect native ecosystems from alien species. Therefore, resistance to diverse predators resulting from a universal anti-predator strategy seems crucial for invasion success. We present a comprehensive review of the responses of an invasive amphipod Dikerogammarus villosus to sympatric and allopatric predator signals. We summarize diverse aspects of the gammarid anti-predator strategy, including predator identification, morphological and behavioral adaptations, effectiveness of shelter use and resistance to indirect predator effects. The response of D. villosus is independent of predator species (including totally allopatric taxa), which assures the high flexibility of its predator recognition system. It has harder exoskeleton and better capability of utilizing shelters compared to other gammarids, resulting in relatively high resistance to predators. Therefore, it can use predator kairomones as indirect food signals (sharing the diet with the predator) and follow the predator scent. This resistance may allow D. villosus to reduce the costs of its physiological responses to predators and sustain growth in their presence. This might facilitate the invasion success by increasing its competitive advantage.

scholarly journals Effects of Sublethal Cadmium Exposure on Antipredator Behavioural and Antitoxic Responses in the Invasive Amphipod Dikerogammarus villosus

PLoS ONE ◽  
2012 ◽  
Vol 7 (8) ◽  
pp. e42435 ◽  
Author(s):  
Pascal Sornom ◽  
Eric Gismondi ◽  
Céline Vellinger ◽  
Simon Devin ◽  
Jean-François Férard ◽  
...  
Keyword(s):  
Cadmium Exposure ◽  
Dikerogammarus Villosus ◽  
Invasive Amphipod

Invasion success of Fibrillanosema crangonycis, n.sp., n.g.: a novel vertically transmitted microsporidian parasite from the invasive amphipod host Crangonyx pseudogracilis

2004 ◽  
Vol 34 (2) ◽  
pp. 235-244 ◽  
Author(s):  
Johanna G.M ◽  
Slothouber Galbreath ◽  
Judith E Smith ◽  
Rebecca S Terry ◽  
James J Becnel ◽  
...  
Keyword(s):  
Invasion Success ◽  
Microsporidian Parasite ◽  
Crangonyx Pseudogracilis ◽  
Invasive Amphipod

scholarly journals Warming indirectly increases invasion success in food webs

2020 ◽  
Author(s):  
Arnaud Sentis ◽  
José M. Montoya ◽  
Miguel Lurgi
Keyword(s):  
Food Web ◽  
Food Webs ◽  
Synergistic Effects ◽  
Invasion Success ◽  
Ecological Communities ◽  
Food Web Structure ◽  
Predator Species ◽  
Web Structure ◽  
Biodiversity Change ◽  
Key Drivers

Climate warming and biological invasions are key drivers of biodiversity change. Their combined effects on ecological communities remain largely unexplored. We investigated the direct and indirect influences of warming on invasion success, and their synergistic effects on community structure and dynamics. Using size-structured food web models, we found that warming increased invasion success. The direct physiological effects of warming on invasions were minimal in comparison to indirect effects mediated by changes on food web structure and stability. Warmed communities with less connectivity, shortened food chains and reduced temporal variability were more susceptible to invasions. The directionality and magnitude of invasions effects on food webs varied across warming regimes. Warmer communities became smaller, more connected, and with more predator species when invaded than their colder counterparts. They were also less stable and their species more abundant. Considering food web structure is crucial to predict invasion success and its impacts under warming.

scholarly journals Pilferer, murderer of innocents or prey? The potential impact of killer shrimp (Dikerogammarus villosus) on crayfish

2020 ◽  
Vol 83 (1) ◽  
Author(s):  
Sara Roje ◽  
Kateřina Švagrová ◽  
Lukáš Veselý ◽  
Arnaud Sentis ◽  
Antonín Kouba ◽  
...  
Keyword(s):  
Native Species ◽  
Developmental Stages ◽  
Aquatic Organisms ◽  
Freshwater Ecosystems ◽  
Signal Crayfish ◽  
Dikerogammarus Villosus ◽  
Native Communities ◽  
Marbled Crayfish ◽  
Invasive Amphipod ◽  
The Impact

Abstract Freshwater ecosystems worldwide are facing the establishment of non-native species, which, in certain cases, exhibit invasive characteristics. The impacts of invaders on native communities are often detrimental, yet, the number and spread of non-native invasive species is increasing. This is resulting in novel and often unexpected combinations of non-native and native species in natural communities. While the impact of invaders on native species is increasingly well-documented, the interactions of non-native invaders with other non-native invaders are less studied. We assessed the potential of an invasive amphipod, the killer shrimp Dikerogammarus villosus (Sowinsky, 1894), to cope with other established invaders in European waters: North American crayfish of the Astacidae family—represented by signal crayfish Pacifastacus leniusculus (Dana, 1852), and the Cambaridae family—represented by marbled crayfish Procambarus virginalis Lyko, 2017. The main goal of this study was to investigate if killer shrimp, besides their role as prey of crayfish, can significantly influence their stocks by predating upon their eggs, hatchlings and free-moving early juveniles. Our results confirmed that killer shrimp can predate on crayfish eggs and hatchlings even directly from females abdomens where they are incubated and protected. As marbled crayfish have smaller and thinner egg shells as well as smaller juveniles than signal crayfish, they were more predated upon by killer shrimp than were signal crayfish. These results confirmed that the invasive killer shrimp can feed on different developmental stages of larger freshwater crustaceans and possibly other aquatic organisms.

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