THE FEEDING ECOLOGY OFHYDRAAND POSSIBLE IMPLICATIONS IN THE STRUCTURING OF POND ZOOPLANKTON COMMUNITIES

Schwartz, Steven S.; Hann, Brenda J.

doi:10.2307/1541196

Cited by 35 publications

(26 citation statements)

References 23 publications

(23 reference statements)

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“…They can be prey themselves for flatworms (Slobodkin and Bossert, 2001). Hydra are ecologically important and play an important role in structuring the planktonic make-up of ponds (Schwartz et al, 1983) and are therefore a valuable indicator species in ecotoxicology.…”

Section: Widespread Prevalence In Freshwater Ecosystemsmentioning

confidence: 99%

Hydra, a model system for environmental studies

Quinn¹,

Gagné²,

Blaise³

2012

Int. J. Dev. Biol.

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Hydra have been extensively used for studying the teratogenic and toxic potential of numerous toxins throughout the years and are more recently growing in popularity to assess the impacts of environmental pollutants. Hydra are an appropriate bioindicator species for use in environmental assessment owing to their easily measurable physical (morphology), biochemical (xenobiotic biotransformation; oxidative stress), behavioural (feeding) and reproductive (sexual and asexual) endpoints. Hydra also possess an unparalleled ability to regenerate, allowing the assessment of teratogenic compounds and the impact of contaminants on stem cells. Importantly, Hydra are ubiquitous throughout freshwater environments and relatively easy to culture making them appropriate for use in small scale bioassay systems. Hydra have been used to assess the environmental impacts of numerous environmental pollutants including metals, organic toxicants (including pharmaceuticals and endocrine disrupting compounds), nanomaterials and industrial and municipal effluents. They have been found to be among the most sensitive animals tested for metals and certain effluents, comparing favourably with more standardised toxicity tests. Despite their lack of use in formalised monitoring programmes, Hydra have been extensively used and are regarded as a model organism in aquatic toxicology.

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Section: Widespread Prevalence In Freshwater Ecosystemsmentioning

confidence: 99%

Hydra, a model system for environmental studies

Quinn¹,

Gagné²,

Blaise³

2012

Int. J. Dev. Biol.

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“…According to Peters et al (2007), microcrustaceans are also among the first colonizers, due to their swimming abilities, often declining in abundance after spring. In this case, it could also be a consequence of a non-selective predator, increased abundance of H. oligactis (Schwartz et al, 1983) towards the end of the research period, i.e. in the summer.…”

Section: Discussionmentioning

confidence: 99%

“…Brown hydra Hydra oligactis (Pallas, 1776), various insect larvae and fish represent main predators in such communities (Armitage et al, 1995;Casatti et al, 2003). Brown hydra is an important predator in the lake communities (Kovačević et al, 2007) and is not selective regarding the size or other characteristics of its prey (Schwartz et al, 1983). The presence or absence of hydra in a water body could have a significant impact on the composition and abundance of invertebrate communities (Schwartz et al, 1983;Walsh, 1995, Cortez andAbrams, 2016), where H. oligactis can be a more successful predator than other Hydra species (Kaliszewicz, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Brown hydra is an important predator in the lake communities (Kovačević et al, 2007) and is not selective regarding the size or other characteristics of its prey (Schwartz et al, 1983). The presence or absence of hydra in a water body could have a significant impact on the composition and abundance of invertebrate communities (Schwartz et al, 1983;Walsh, 1995, Cortez andAbrams, 2016), where H. oligactis can be a more successful predator than other Hydra species (Kaliszewicz, 2013). This species has often been neglected in ecological research regarding trophic interactions, but has usually been a model organism for toxicology, regeneration and genetic studies (Quinn et al, 2012;Kovačević et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Phytophilous Fauna of a Small and Artificial Urban Lake

Krajina¹,

Bogut

Čerba

et al. 2017

Croatian Journal of Fisheries

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Phytophilous community on Myriophyllum spicatum was studied in a small artificial urban lake in the city of Osijek (eastern Croatia), during the spring and summer season in 2010. In the eutrophic conditions, macrophyte stands were well developed and in the formed periphyton representatives of the following invertebrate taxa were found: Hydrozoa, Nematoda, Gastropoda, Cladocera, Copepoda, Insecta larvae - including families Chironomidae and Coleoptera. They displayed differences in temporal abundance patterns. Two separate phases in macrophyte colonization with differences in invertebrate composition and abundance were recorded. Insect larvae, particularly Chironomidae, were most abundant in the first phase, through the spring period, and Hydra oligactis (brown hydra) was most abundant in the second phase, i.e. summer period. Concurrently, microcrustacean abundance declined towards the end of the summer. Results of the analyses indicated that water temperature and perihyton biomass were the variables exerting the main influence on the invertebrate assemblage, while interestingly, macrophyte size and biomass were negatively correlated with most of the fauna abundance. On the other hand, brown hydra was negatively correlated with all other invertebrate taxa, except gastropods. Larger surface of submersed macrophytes is the main parameter supporting the increase of invertebrate abundance due to providing protection from predators and growth for periphyton, an important food source for these phytophilous organisms. Macrophyte length was positively correlated with Hydra abundance, while Chironomids were more influenced by periphyton biomass. These organisms can indicate water quality conditions and a potential increase in primary and secondary production.

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“…Such mechanisms could involve, in the case of Hydra, reducing activation of nematocysts, some kind of immunity to the toxin or resistance to nematocyst penetration through the carapace thickness (Schwartz et al, 1983). The latter could be tested in prey species with strongly built carapaces such as Simocephalus and chydorids and with smoother ones like Daphnia, Diaphanosoma, and Moina (Dodson and Frey, 2001;Dumont and Negrea, 2002).…”

Section: Introductionmentioning

confidence: 99%

Effects of predation by Hydra (Cnidaria) on cladocerans (Crustacea: Cladocera)

2016

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Planktonic cladocerans have evolved different strategies to avoid predation from vertebrates; these include changes in morphology, behavior, physiology, and/or life-history traits. However, littoral cladocerans are better adapted to avoid invertebrate predation particularly from insect larvae by evolving morphological and physiological adaptations. Nevertheless, this has not been proven for some littoral predators such as Hydra. In this study, we provide quantitative data on how Hydra affects its zooplankton prey. We studied the predation behavior on Alona glabra, Ceridodaphnia dubia, Daphnia pulex, Daphnia cf. mendotae, Diaphanosoma birgei, Macrothrix triserialis, Moina macrocopa, Pleuroxus aduncus, Scapholeberis kingi, Simocephalus vetulus, Elaphoidella grandidieri, Brachionus rubens and Euchlanis dilatata. We also tested the indirect effect of allelochemicals from Hydra on the demography of Daphnia cf. mendotae. Littoral cladocerans are specially adapted to resist nematocyst injection and discharge of toxic substances from Hydra. A significant decrease in the population growth rate from 0.21 to 0.125 d-1 was observed at densities of 2 ind. ml-1. The role of carapace thickness as an adaptive strategy of littoral cladocerans against Hydra predation is discussed.

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THE FEEDING ECOLOGY OFHYDRAAND POSSIBLE IMPLICATIONS IN THE STRUCTURING OF POND ZOOPLANKTON COMMUNITIES

Cited by 35 publications

References 23 publications

Hydra, a model system for environmental studies

Hydra, a model system for environmental studies

Phytophilous Fauna of a Small and Artificial Urban Lake

Effects of predation by Hydra (Cnidaria) on cladocerans (Crustacea: Cladocera)

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