Environmental factors influencing the distribution and abundance of the introduced signal crayfish in the north of Iberian Peninsula

2017 ◽  
Vol 68 (5) ◽  
pp. 900 ◽  
Author(s):  
I. Vedia ◽  
D. Galicia ◽  
E. Baquero ◽  
J. Oscoz ◽  
R. Miranda
Keyword(s):  
Aquatic Ecosystems ◽  
Procambarus Clarkii ◽  
Lower Proportion ◽  
Native Fish ◽  
Limiting Factor ◽  
Northern Spain ◽  
Signal Crayfish ◽  
The North ◽  
Organic Debris ◽  
Invasive Crayfish

The identification of habitat requirements of invasive species is essential to evaluate their spread and to assess the vulnerability of recipient ecosystems. We studied the distribution and abundance of the invasive signal crayfish (Pacifastacus leniusculus) in 43 sites in northern Spain and analysed the relationships with several abiotic and biotic parameters of the aquatic ecosystems. Our results indicated that the abundance of signal crayfish was positively associated with vegetation cover and negatively associated with boulders. Also, its abundance was positively correlated with water temperature, organic matter, cations (e.g. sodium), anions (e.g. sulfates) and abundance of some native fish species (Parachondrostoma miegii and Luciobarbus graellsii). We concluded that the habitat of signal crayfish is among salmonid stretches (headwaters) with cold waters and low proportion of organic debris, and among cyprinid stretches (low waters) with warmer waters which it inhabits with another invasive crayfish, the red swamp crayfish (Procambarus clarkii). Our analysis indicated that the presence of signal crayfish is limited in the uppermost stretches by lower water temperatures and a lower proportion of organic debris. The existence of a natural environmental limiting factor in upstream reaches facilitates the conservation of aquatic ecosystems and native fauna.

scholarly journals First report of freshwater atyid shrimp, Caridina formosae (Decapoda: Caridea) as a host of ectosymbiotic branchiobdellidan, Holtodrilus truncatus (Annelida, Citellata)

2020 ◽  
pp. 33
Author(s):  
Rafał Maciaszek ◽  
Aleksandra Jabłońska ◽  
Sebastian Prati ◽  
Wiesław Świderek
Keyword(s):  
Natural Water ◽  
Aquatic Ecosystems ◽  
Selective Breeding ◽  
Preventive Measures ◽  
Procambarus Clarkii ◽  
Aquarium Trade ◽  
First Report ◽  
Invasive Crayfish ◽  
Natural Water Bodies ◽  
Ornamental Trade

In recent years, ornamental shrimps gained increasing popularity in the aquarium trade. Unfortunately, they are potential vectors of epibionts, which may be unintentionally introduced to aquaria with imported shrimps. This contribution presents the first report of the occurrence of Holtodrilus truncatus on aquarium freshwater shrimp Caridina formosae. A total of 120 shrimp imported from Taiwan as aquarium pets were examined for the presence of epibionts. Holtodrilus truncatus occurred in 23.3% of shrimps. A total of 29.6% of crustaceans showed signs of damages as a result of H. truncatus activity. The shrimp is not common in the ornamental trade and is not subject to selective breeding. Therefore C. formosae populations available on the market, if not wild-caught, are most likely very similar to those occurring in Taiwanese natural water bodies, where H. truncatus occurs in Neocaridina shrimp. Neocaridina spp. are a known host for this epibiont, and transmission between species might occur in nature as well as in the aquarium trade were densities of animals are often high. The ability of H. truncatus to infect also highly invasive crayfish Procambarus clarkii, might also pose concern for regions where this crustacean is widespread. The actual lack of preventive measures for shrimp epibionts as well as confirmed releases of ornamental crustaceans into new aquatic ecosystems may result in further spread of H. truncatus, a potential new threat to native crustaceans and other epibionts.

scholarly journals Cage traps and baits for capturing the North American invasive crayfish Procambarus clarkii.

2015 ◽  
Vol 18 (2) ◽  
pp. 115-125
Author(s):  
Rika SHIRAISHI ◽  
Haruna USHIMI ◽  
Kazuyoshi NAKATA
Keyword(s):  
North American ◽  
Procambarus Clarkii ◽  
The North ◽  
Invasive Crayfish

scholarly journals Artificial burrow sizes for capturing the North American invasive crayfish Procambarus clarkii.

2015 ◽  
Vol 18 (2) ◽  
pp. 79-86
Author(s):  
Haruna USHIMI ◽  
Yuta MIYATAKE ◽  
Naoaki TSUTSUI ◽  
Tatsuya SAKAMOTO ◽  
Kazuyoshi NAKATA
Keyword(s):  
North American ◽  
Procambarus Clarkii ◽  
The North ◽  
Invasive Crayfish

scholarly journals Airborne Fungi in Show Caves from Southern Spain

2021 ◽  
Vol 11 (11) ◽  
pp. 5027
Author(s):  
Irene Dominguez-Moñino ◽  
Valme Jurado ◽  
Miguel Angel Rogerio-Candelera ◽  
Bernardo Hermosin ◽  
Cesareo Saiz-Jimenez
Keyword(s):  
Entomopathogenic Fungi ◽  
Airborne Fungi ◽  
Southern Spain ◽  
Ecological Indicator ◽  
Outdoor Air ◽  
Northern Spain ◽  
Pochonia Chlamydosporia ◽  
The North ◽  
Show Caves ◽  
Characteristic Features

The aerobiology of caves in Southern Spain possesses special characteristics, different from caves located in Northern Spain. Previous studies demonstrated the influence of outdoor air on caves in the north and the existence of two different patterns, depending on the season. In summer there is an abundance of Ascomycota, whereas in winter Basidiomycota predominates, which are related to the periods of stagnation and ventilation, respectively. In caves in Southern Spain the presence of airborne Basidiomycota is scarce and Ascomycota represents the main group of fungi widely distributed across the caves in all seasons. The most characteristic features were the abundant presence of entomopathogenic fungi (Beauveria bassiana, Parengyodontium album, Pochonia chlamydosporia, Leptobacillium symbioticum, Leptobacillium leptobactrum) and Cladosporium cladosporioides in Cueva del Tesoro, Cueva de Ardales and Gruta de las Maravillas. However, the presence of yeasts of the genera Cutaneotrichosporon, Trichosporon, Cryptococcus, Naganishia, Cystobasidium, Microstroma and Phragmotaenium was exclusive to Gruta de las Maravillas. Fungal hazard in the three show caves were determined using an ecological indicator based on the concentration of spores in cave air.

scholarly journals Can heat waves change the trophic role of the world’s most invasive crayfish? Diet shifts in Procambarus clarkii

PLoS ONE ◽  
2017 ◽  
Vol 12 (9) ◽  
pp. e0183108 ◽  
Author(s):  
Bruno M. Carreira ◽  
Pedro Segurado ◽  
Anssi Laurila ◽  
Rui Rebelo
Keyword(s):  
Procambarus Clarkii ◽  
Heat Waves ◽  
Invasive Crayfish ◽  
Diet Shifts ◽  
Trophic Role

scholarly journals Size-mediated, density-dependent cannibalism in the signal crayfish Pacifastacus leniusculus (Dana, 1852) (Decapoda, Astacidea), an invasive crayfish in Britain

Crustaceana ◽  
2017 ◽  
Vol 90 (4) ◽  
pp. 417-435 ◽  
Author(s):  
R. J. Houghton ◽  
C. Wood ◽  
X. Lambin
Keyword(s):  
Relative Size ◽  
Pacifastacus Leniusculus ◽  
Gut Contents ◽  
Size Distributions ◽  
Signal Crayfish ◽  
Density Dependent ◽  
Invasive Crayfish ◽  
The Relationship ◽  
Best Fit

The role of cannibalism in crayfish populations is not well understood, despite being a potentially key density-dependent process underpinning population dynamics. We studied the incidence of cannibalism in an introduced signal crayfish Pacifastacus leniusculus population in a Scottish lowland river in September 2014. Animals were sampled using six different sampling techniques simultaneously, revealing variable densities and size distributions across the site. Cannibalism prevalence was estimated by analysing the gut contents of crayfish >20 mm CL for the presence of crayfish fragments, which was found to be 20% of dissected individuals. When seeking evidence of relationships between the sizes of cannibals and ‘prey’, the density of conspecifics <56% the size of a dissected individual yielded the best fit. The relationship between cannibalism probability and crayfish size and density was equally well described by three different metrics of crayfish density. Cannibalism increased with crayfish size and density but did not vary according to sex. These results suggest that large P. leniusculus frequently cannibalize smaller (prey) conspecifics, and that the probability of cannibalism is dependent upon the relative size of cannibal-to-prey and the density of the smaller crayfish. We suggest that removing large individuals, as targeted by many traditional removal techniques, may lead to reduced cannibalism and therefore a compensatory increase in juvenile survival.

scholarly journals The Maximum Length Record of the Blackspot Seabream (Pagellus bogaraveo Brünnich, 1768) for the Entire Aegean Sea and Turkish Territorial Waters

2020 ◽  
Vol 8 (10) ◽  
pp. 2125-2130
Author(s):  
Şenol Paruğ ◽  
Özgür Cengiz
Keyword(s):  
Stock Assessment ◽  
Biological Activities ◽  
Aegean Sea ◽  
Maximum Length ◽  
Northern Spain ◽  
Domestic Markets ◽  
Total Length ◽  
North East ◽  
The North ◽  
Pagellus Bogaraveo

The maximum length, weight, and age information of organisms in an ecosystem, moreover, the first records of migrated exotic species are essential in terms of the basis for the studies on population dynamics, stock assessment, and biological activities. Therefore, the recording of such data may be necessary for scientific databases and new related studies. The Blackspot seabream (Red seabream - Pagellus bogaraveo), which belongs to the Sparidae family, is an important seafood which is marketed fresh and frozen around the Mediterranean and the Aegean seas. Nowadays, this species has high prices depending on market demands in domestic markets as a result of overfishing and is also cultured in northern Spain. It is classified as “Near Threatened Species” in the red list due to its decreasing population trend by the IUCN. A single specimen of the Blackspot seabream with 30.7 cm in total length and 390.00 g in total weight, which was angled in the Saros Bay with a handline by a fisherman on February 08, 2019, was obtained from a fishmonger in Çanakkale. Even though there are bigger individuals in the North-east Atlantic probably depending on polar and/or deep-sea gigantism, the mentioned measurement is the proven maximum total length of this species for the Aegean Sea up to the time.

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