The occurrence of branchiobdellidans on stone crayfish (<i>Austropotamobius torrentium</i>) in the Czech Republic

Vlach, Pavel; Šrámková, Lucie; Fialová, Kateřina; Nováková, K

doi:10.1051/kmae/2017028

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…While records of these four Branchiobdella species in the study area were not unexpected due to their wide distribution in Central Europe (Voigt, 1885;Pierantoni, 1912;Karaman, 1970;Nesemann, 1994;Neubert and Nesemann, 1999;Nesemann and Hutter, 2002;Füreder et al, 2009;Vlach et al, 2017), we report here for the first time the occurrence of the polychaete worm H. chappuisi on freshwater crayfish in the Central European Alps. In contrast to sporadic findings of this polychaete in east and southeast Europe (Boshko, 1983;Subchev and Stanimirova, 1986;Subchev et al, 2007) this polychaete is apparently a common part of the stone crayfish epibiont communities in Central Europe.…”

Section: Diversity and Characteristics Of Epibiont Communitiesmentioning

confidence: 48%

Annelid symbiont assemblage and European stone crayfish − a deterministic relationship with implications for conservation management

Berger¹,

Füreder²

2017

Knowl. Manag. Aquat. Ecosyst.

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-The protected European stone crayfish, Austropotamobius torrentium, is a host to epibionts inhabiting its exoskeleton. Despite evidence of the close association of these epibionts to the crayfish and the beneficial services provided for the crayfish, the main factors influencing their occurrence, distribution and abundance are still poorly understood. In order to investigate the stone crayfish epibiont community, the ecological requirements of individual species, and aspects of the host-epibiont relationship we collected data at several crayfish populations in Austria, Switzerland and Germany. At each location, we recorded the epibiont position on the crayfish host along with a number of biotic and abiotic parameters. Apart from recording the Branchiobdella species B. parasita, B. hexadonta, B. pentadonta and B. balcanica, we detected for the first time the polychaete Hystricosoma chappuisi in the European Alps. Species-specific biogeographical and habitat factors such as river catchment borders, crayfish length, water temperature and nutrients concentration were identified to be important for the occurrence and abundance of epibionts. Branchiobdella species were strongly linked to certain host body areas, providing evidence for the existence of different functional traits within the annelid assemblage. With this study we demonstrate that the crayfish-epibionts relationship includes structural and functional complexities that can be important for defining management units in future conservation policies. Due to benefits for the mutualistic relationship, restocking and reintroduction actions are likely to be more successful, if ecological requirements of both the host and the epibiont species are considered.Keywords: Austropotamobius torrentium / Branchiobdella / Hystricosoma chappuisi / biogeography / aquatic microcosm Résumé -L'assemblage des annélides symbiotes et l'écrevisse des torrents européenne À une relation déterministe avec des implications pour la gestion de la conservation. L'écrevisse des torrents européenne Austropotamobius torrentium, espèce protégée, est l'hôte d'épibiontes fixés sur son exosquelette. Malgré les preuves de l'association étroite de ces épibiontes aux écrevisses et les services bénéfiques fournis aux écrevisses, les principaux facteurs influençant leur occurrence, leur distribution et leur abondance sont encore mal compris. Afin d'étudier la communauté d'épibiontes de l'écrevisse des torrents, les exigences écologiques des différentes espèces et certains aspects de la relation hôte-épibionte, nous avons recueilli des données sur plusieurs populations d'écrevisses en Autriche, en Suisse et en Allemagne. A chaque endroit, nous avons enregistré la position de l'épibionte sur l'écrevisse ainsi qu'un certain nombre de paramètres biotiques et abiotiques. En plus de l'enregistrement des espèces de Branchiobdelles B. parasita, B. hexadonta, B. pentadonta et B. balcanica, nous avons détecté pour la première fois le polychète Hystricosoma chappuisi dans les Alpes européennes. Des f...

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Section: Diversity and Characteristics Of Epibiont Communitiesmentioning

confidence: 48%

Annelid symbiont assemblage and European stone crayfish − a deterministic relationship with implications for conservation management

Berger¹,

Füreder²

2017

Knowl. Manag. Aquat. Ecosyst.

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“…Branchiobdellidans vary widely in their abundances and diversity on native hosts. It is not unusual to find several species on a single host, and total branchiobdellidan abundances on a single host can be in the 100s (Skelton et al 2013, Vlach et al 2017, though these patterns vary depending on host, particular species of branchiobdellidan, and environmental conditions (Skelton et al 2013).…”

Section: Study Systemmentioning

confidence: 99%

Impacts of Invasion on a Freshwater Cleaning Symbiosis

Bell,

McElmurray,

Creed

et al. 2023

Preprint

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Invasions are a driving force behind the loss of biodiversity, but the effect of invasion on native symbiont communities has received scant attention. While invasive hosts may present an opportunity to native symbionts through providing a novel host environment, invasive hosts could also be noncompetent host, resulting in negative impacts on native symbionts. Two invasive crayfish hosts in the genus Faxonius have been introduced in three watersheds in western Virginia, USA. Previous studies suggest that the invasive host F. cristavarius is a less competent host for native branchiobdellidan symbionts when compared to native hosts in the genus Cambarus. We carried out an extensive survey in these watersheds to determine impacts of varying degrees of invasion on symbiont abundance and diversity. We also conducted an experiment to investigate how increases in the relative abundance of invasive hosts contributes to observed patterns of symbiont abundance and diversity in the field. In our survey, as the proportion of invasive hosts at a site increased branchiobdellidan abundance and diversity declined significantly. In the experiment, the worms dispersed onto both native and invasive hosts. As the percentage of invasive hosts increased, the survival of symbionts declined. Both symbiont survival and opportunities for successful dispersal were reduced as invasive hosts displaced native hosts. Given that many native hosts accrue significant fitness benefits from their relationships with native symbionts, losses of beneficial symbionts may produce a feedback loop that decreases invasion resistance of native species, exacerbates the effects of invasions, and presents a major conservation issue.

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Impacts of invasion on a freshwater cleaning symbiosis

Bell,

McElmurray,

Creed

et al. 2024

Oecologia

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Organismal invasions have repeatedly been cited as a driving force behind the loss of biodiversity. Unlike many other impacts of invasion, the effect of invasion on native symbiont communities has received less attention. The introduction of invasive hosts presents a potential opportunity to native symbionts; invasive hosts could benefit native symbionts through providing a novel host environment that improves symbiont fitness relative to their fitness on native hosts. Alternatively, invasive hosts could noncompetent hosts for native symbionts, resulting in negative impacts on native symbiont abundance and diversity. Crayfish in the northern hemisphere host diverse assemblages of obligate annelid symbionts (P: Anellida, O: Branchiobdellida). Two invasive crayfish hosts in the genus Faxonius have been introduced and are interacting with the native crayfish hosts and their symbionts in three watersheds in western Virginia, USA. Previous studies suggest that the invasive host F. cristavarius is a less competent host for symbionts compared to native hosts in the genus Cambarus. We carried out an extensive survey in these watersheds to determine impacts of varying degrees of invasion on branchiobdellidan abundance and diversity. We also conducted a complementary host replacement experiment to investigate how increases in the relative abundance of invasive hosts contributes to observed patterns of symbiont abundance and diversity in the field. In our survey, as the proportion of invasive hosts at a site increased, branchiobdellidan abundance and diversity declined significantly. In the experiment, the worms dispersed onto both native and invasive hosts. As the percentage of noncompetent F. cristavarius hosts increased, the survival of branchiobdellidans declined. Both symbiont survival and opportunities for successful dispersal are reduced as this noncompetent invasive host progressively displaces native hosts, which imperils the integrity of native host-symbiont systems. Given that many native hosts accrue significant fitness benefits from their relationships with native symbionts, including hosts in our study system, losses of beneficial symbionts may produce a positive feedback loop that decreases invasion resistance of native species, exacerbates the effects of invasions, and presents a major conservation issue in invaded systems.

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The occurrence of branchiobdellidans on stone crayfish (Austropotamobius torrentium) in the Czech Republic

Cited by 3 publications

References 22 publications

Annelid symbiont assemblage and European stone crayfish − a deterministic relationship with implications for conservation management

Annelid symbiont assemblage and European stone crayfish − a deterministic relationship with implications for conservation management

Impacts of Invasion on a Freshwater Cleaning Symbiosis

Impacts of invasion on a freshwater cleaning symbiosis

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