scholarly journals Three crayfish species of different origin in a medium-sized river system: a new state of affairs

2021 ◽  
pp. 26
Author(s):  
Grzegorz Radtke ◽  
Rafał Bernaś ◽  
Piotr Dębowski ◽  
Dariusz Ulikowski ◽  
Andrzej Kapusta
Keyword(s):  
Fish Fauna ◽  
River System ◽  
Indigenous Species ◽  
Baltic Basin ◽  
Small Stream ◽  
Signal Crayfish ◽  
System A ◽  
Invasive Crayfish ◽  
Noble Crayfish ◽  
Crayfish Species

In view of contemporary changes in aquatic environments, determining the distribution of both native and emerging invasive crayfish species is increasingly important. In central Europe, the three invasive crayfish species of the signal crayfish Pacifastacus leniusculus (Dana, 1852), the spiny-cheek crayfish Faxonius limosus (Rafinesque, 1817) and the red swamp crayfish Procambarus clarki (Girard, 1852) are of North American origin. The spiny-cheek crayfish was first brought to the southern Baltic basin at the end of nineteenth century, and its expansion ensued rapidly. At the same time, the indigenous species of the noble crayfish Astacus astacus (Linnaeus, 1758) began to disappear. The spread of the signal crayfish started in the second half of twentieth century; however, it has progressed strongly in recent years. Latest studies of fish fauna in the Drwęca River system, a tributary of the lower Vistula River, have simultaneously revealed new information on the occurrence of crayfish. The most widespread was spiny-cheek crayfish found at ten sites throughout the river basin. The second alien species, the signal crayfish, was noted in four locations in the upper part of the river system, but no mixed populations were noted. A particularly valuable result of the study was the discovery of an unknown site of noble crayfish in a small stream.

Relaxed attitude towards spreading of alien crayfish species affects protection of native crayfish species: case studies and lessons learnt from a Fennoscandian viewpoint

2020 ◽  
Vol 25 (1) ◽  
pp. 39-46
Author(s):  
Japo Jussila ◽  
Lennart Edsman
Keyword(s):  
Competitive Advantage ◽  
Pacifastacus Leniusculus ◽  
Astacus Astacus ◽  
Signal Crayfish ◽  
Aphanomyces Astaci ◽  
Noble Crayfish ◽  
Native Crayfish ◽  
Chronic Carrier ◽  
Highly Virulent ◽  
Crayfish Species

Abstract The spreading of the alien signal crayfish (Pacifastacus leniusculus) is posing an ongoing threat to native European crayfish species in Fennoscandia, like the native noble crayfish (Astacus astacus). The signal crayfish is commonly a chronic carrier of the crayfish plague (Aphanomyces astaci), thus, in addition to being more competitive than noble crayfish, it also has a competitive advantage in this disease over the noble crayfish. The challenges rising from the introduction of the alien signal crayfish to Sweden, Finland and finally also Norway, are similar in nature. The licensed and unlicensed spreading of this species also has a similar history in these countries. In this paper we describe some of the patters of the spread of alien signal crayfish and highlight the detrimental nature of an alien crayfish, accompanied by a highly virulent disease, to native Fennoscandian crayfish and also to native Fennoscandian ecosystems. A halt to the further spreading of alien signal crayfish in Fennoscandia is the only means to ensure successful conservation outcomes for the noble crayfish.

scholarly journals Divergent temperature-specific metabolic and feeding rates of native and invasive crayfish

2021 ◽  
Author(s):  
T. J. Ruokonen ◽  
J. Karjalainen
Keyword(s):  
Native Species ◽  
Ecological Impacts ◽  
Metabolic Rates ◽  
Feeding Rates ◽  
Cold Temperatures ◽  
Signal Crayfish ◽  
Climatic Scenarios ◽  
Invasive Crayfish ◽  
Noble Crayfish ◽  
The Impact

AbstractTemperature is one of the most important factors governing the activity of ectothermic species, and it plays an important but less studied role in the manifestation of invasive species impacts. In this study, we investigated temperature-specific feeding and metabolic rates of invasive and native crayfish, and evaluated how temperature regulates their ecological impacts at present and in future according to different climatic scenarios by bioenergetics modelling. We conducted a series of maximum food consumption experiments and measured the metabolic rates of cold-adapted native noble crayfish (Astacus astacus) and invasive signal crayfish (Pacifastacus leniusculus) originally from a warmer environment over a temperature gradient resembling natural temperatures in Finland. The maximum feeding rates and routine metabolic rates (RMR) of native noble crayfish were significantly higher at low temperatures (< 10 °C than the rates of invasive signal crayfish. The RMRs of the species crossed at 18 °C, and the RMRs of signal crayfish were higher at temperatures above 18 °C. These findings indicate that the invader’s thermal niche has remained stable, and the potential impacts per capita are lower at suboptimal cold temperatures than for the native species. Our bioenergetics modelling showed that the direct annual predation impact of noble and signal crayfish seem similar, although the seasonal dynamics of the predation differs considerably between species. Our results highlight that the temperature-specific metabolic and feeding rates of species need to be taken into account in the impact assessment instead of simple generalisations of the direction or magnitude of impacts.

scholarly journals Agonism and shelter competition between invasive and indigenous crayfish species

2004 ◽  
Vol 82 (12) ◽  
pp. 1923-1932 ◽  
Author(s):  
Francesca Gherardi ◽  
William H Daniels
Keyword(s):  
Procambarus Clarkii ◽  
Reproductive Potential ◽  
Limited Resource ◽  
Indigenous Species ◽  
Laboratory Studies ◽  
Freshwater Biodiversity ◽  
Future Studies ◽  
Invasive Crayfish ◽  
Procambarus Acutus ◽  
Crayfish Species

Several crayfish species behave as biological invaders. Their establishment in an area has frequently been accompanied by the reduction or elimination of indigenous species. A laboratory study was designed to investigate whether the invasive crayfish Procambarus clarkii (Girard, 1852) is dominant over the indigenous (to Delaware) crayfish Procambarus acutus acutus (Girard, 1852) in either the absence or the presence of a shelter as a limited resource. As expected, we found that P. clarkii is more aggressive than the similarly sized P. a. acutus, thus confirming previous studies that demonstrated an inherent dominance of the invasive over the indigenous crayfish. We then hypothesized that species showing a lower preference for an offered shelter (P. clarkii) should be less motivated to defend it. To the contrary, in a competitive context P. clarkii excluded P. a. acutus from the shelter but did not use the resource. Caution must be used in extrapolating these laboratory studies to the field, and future studies should analyze multiple factors, including the autoecology of the two species and their reproductive potential and recruitment patterns. However, our results might help in highlighting the risks for freshwater biodiversity created by the uncontrolled translocations of P. clarkii and other similar invasive species.

scholarly journals On the occurrence of three non-native cichlid species including the first record of a feral population of Pelmatolapia ( Tilapia ) mariae (Boulenger, 1899) in Europe

2017 ◽  
Vol 4 (6) ◽  
pp. 170160 ◽  
Author(s):  
Juliane A. Y. Lukas ◽  
Jonas Jourdan ◽  
Gregor Kalinkat ◽  
Sebastian Emde ◽  
Friedrich Wilhelm Miesen ◽  
...  
Keyword(s):  
Native Species ◽  
Water Discharge ◽  
Fish Fauna ◽  
River System ◽  
First Record ◽  
Fish Parasites ◽  
Native Fish ◽  
Small Stream ◽  
Cichlid Species ◽  
Convict Cichlids

Thermally influenced freshwater systems provide suitable conditions for non-native species of tropical and subtropical origin to survive and form proliferating populations beyond their native ranges. In Germany, non-native convict cichlids ( Amatitlania nigrofasciata ) and tilapia ( Oreochromis sp.) have established populations in the Gillbach, a small stream that receives warm water discharge from a local power plant. Here, we report on the discovery of spotted tilapia ( Pelmatolapia mariae ) in the Gillbach, the first record of a reproducing population of this species in Europe. It has been hypothesized that Oreochromis sp. in the Gillbach are descendants of aquaculture escapees and our mtDNA analysis found both O. mossambicus and O. niloticus maternal lineages, which are commonly used for hybrids in aquaculture. Convict cichlids and spotted tilapia were most probably introduced into the Gillbach by aquarium hobbyists. Despite their high invasiveness worldwide, we argue that all three cichlid species are unlikely to spread and persist permanently beyond the thermally influenced range of the Gillbach river system. However, convict cichlids from the Gillbach are known to host both native and non-native fish parasites and thus, non-native cichlids may constitute threats to the native fish fauna. We therefore strongly recommend continuous monitoring of the Gillbach and similar systems.

Crayfish predation on amphibian eggs and larvae

1997 ◽  
Vol 18 (3) ◽  
pp. 217-228 ◽  
Author(s):  
Per Nyström ◽  
Eva Axelsson ◽  
Johan Sidenmark ◽  
Christer Brönmark
Keyword(s):  
Bufo Bufo ◽  
Amphibian Species ◽  
Signal Crayfish ◽  
Hyla Arborea ◽  
Noble Crayfish ◽  
The Impact ◽  
Toad Bufo ◽  
Toad Bufo Bufo ◽  
Eggs And Larvae ◽  
Crayfish Species

AbstractWe experimentally evaluated the impact of the introduced signal crayfish (Pacifastacus leniusculus) and the native noble crayfish (Astacus astacus) on eggs and larvae of seven species of amphibians, likely to co-occur with crayfish in southern Sweden. In aquarium experiments eggs and tadpoles of all amphibian species were consumed by both crayfish species. The consumption of amphibian eggs by signal crayfish increased with temperature. The noble crayfish consumed more tadpoles than the signal crayfish, but the latter caused more sub-lethal damage to tadpoles. Tadpoles of the common toad (Bufo bufo) were sometimes killed but left uneaten by both crayfish species. In pool experiments, signal crayfish consumed more tadpoles of Hyla arborea in a less complex habitat and significantly reduced survival of Hyla tadpoles and the biomass of aquatic macrophytes.

Detection of nobel crayfish Astacus astacus v1

2020 ◽  
Author(s):  
Omneya Ahmed ◽  
Alexander Eiler
Keyword(s):  
Freshwater Ecosystems ◽  
Pacifastacus Leniusculus ◽  
Indigenous Species ◽  
Astacus Astacus ◽  
Signal Crayfish ◽  
Noble Crayfish ◽  
Non Indigenous Species

Crayfish play important role in freshwater ecosystems. Noble crayfish "Astacus astacus" is threatened by non-indigenous species such as signal crayfish "Pacifastacus leniusculus".

Detection of signal crayfish Pacifastacus leniusculus v1

2020 ◽  
Author(s):  
Omneya Ahmed ◽  
Alexander Eiler ◽  
Mats Töpel
Keyword(s):  
Freshwater Ecosystems ◽  
Pacifastacus Leniusculus ◽  
Indigenous Species ◽  
Astacus Astacus ◽  
Signal Crayfish ◽  
Specific Assay ◽  
Noble Crayfish ◽  
Species Specific ◽  
Non Indigenous Species

A species-specific assay was developed and tested by Agersnap et al. (2017) Crayfish play important role in freshwater ecosystems. Noble crayfish "Astacus astacus" is threatened to extinct by non-indigenous species such as signal crayfish "Pacifastacus leniusculus".

scholarly journals Phenology of overland dispersal in the invasive crayfish Faxonius immunis (Hagen) at the Upper Rhine River area

2018 ◽  
pp. 30 ◽  
Author(s):  
Alexander Herrmann ◽  
Adam Schnabler ◽  
Andreas Martens
Keyword(s):  
Invasive Alien Species ◽  
Procambarus Clarkii ◽  
Regional Scale ◽  
River System ◽  
Rhine River ◽  
Aquatic Biodiversity ◽  
Invasive Crayfish ◽  
Citizen Science Project ◽  
Upper Rhine ◽  
Crayfish Species

The non-indigenous crayfish Faxonius immunis (Hagen) is the dominant crayfish species at the Upper Rhine River system since his detection in 1993. As an invasive alien species, it is one of the biggest threats to aquatic biodiversity in the area. By dispersing over land, the species has a high potential to colonize small ponds created for threatened amphibians and dragonflies. Shortly after invasion, the fast growing population of F. immunis is changing the habitat drastically. In June 2016, our team started a local information campaign including citizen science project where the local people south of Karlsruhe, Baden-Wuerttemberg, Germany, could contact us when they spot a crayfish migrating over land to assess the activity of overland dispersal on a regional scale. Until January 2018, we got a total of 98 responses. Thirty-nine include suitable information including 33 records of overland dispersal of F. immunis. The species was recorded on land throughout the year, except February and July. Additionally, single observations of overland dispersal of other invasive crayfish species, naming Procambarus clarkii (Girard), Pacifastacus leniusculus (Dana), Procambarus virginalis (Lyko) and Faxonius limosus (Rafinesque), were recorded.

scholarly journals Checklist and key for the identification of fish fauna of the Uberaba River, Upper Paraná River system, Brazil

ZooKeys ◽  
2019 ◽  
Vol 875 ◽  
pp. 129-155
Author(s):  
Douglas de Castro Ribeiro ◽  
Jumma Miranda Araújo Chagas ◽  
Mariana Ribeiro Thereza ◽  
Francisco Langeani
Keyword(s):  
Native Species ◽  
Fish Fauna ◽  
River System ◽  
Water Source ◽  
Paraná River ◽  
The Public ◽  
Parana River ◽  
System A ◽  
Minas Gerais State ◽  
Upper Paraná River

The Uberaba River is an important right-bank tributary to the Grande River, in the Upper Paraná River system, Brazil, and the main water source for the public supply of the Uberaba city, Minas Gerais state. An inventory, an identification key, and photographs of the fish species of the Uberaba River are provided, based on samples made between 2012 and 2014 at 14 sampling sites in the river system. A total of 73 species was recorded from six orders, 20 families, and 49 genera. Characiformes and Siluriformes are the most speciose orders and Characidae and Loricariidae are the most commonly recorded families. Most species are autochthonous, nine are considered allochthonous, and two species are exotic. The Uberaba River has a diverse and heterogeneous ichthyofauna, typical of rheophilic environments, with endemic species and few non-native species.

Evaluation of catchment hydrology and soil loss in non-perennial river system: a case study of Subarnarekha Basin, India

2021 ◽  
Author(s):  
Rituparna Acharyya ◽  
Niloy Pramanick ◽  
Subham Mukherjee ◽  
Subhajit Ghosh ◽  
Abhra Chanda ◽  
...  
Keyword(s):  
Soil Loss ◽  
River System ◽  
Catchment Hydrology ◽  
System A
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