A model of co-occurrence: segregation and aggregation patterns in the mycoflora of the crayfish Procambarus clarkii in Lake Trasimeno (central Italy)

The deliberate or accidental introduction of invasive alien species (IAS) causes negative ecological and economic impacts altering ecosystem processes, imperiling native species and causing damage to human endeavors. A monthly monitoring program was performed in Lake Trasimeno (Central Italy) from July 2018 to July 2019 in order to provide an upgrade of the population ecology of Procambarus clarkii and to assess the genetic diversity by analyzing the relationships among mitochondrial DNA diversity. Our results confirmed that P. clarkii is well acclimatized in the lake, revealing a stable population structure favored by the resources and conditions typical of this ecosystem, which seem to be optimal for the maintenance of the species. Four distinct mitochondrial haplotypes were detected, but one of them was clearly overrepresented (76%), suggesting that a single predominant introduction event may have occurred in this area, likely followed by secondary events. The identification of the typical genetic variants provides a better understanding of the evolutionary scenarios of P. clarkii in this biotope and it can be helpful in management plans concerning the expanding populations of this invasive alien species.

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The Red Alien vs. the Blue Destructor: The Eradication of Cherax destructor by Procambarus clarkii in Latium (Central Italy)

Diversity ◽

10.3390/d10040126 ◽

2018 ◽

Vol 10 (4) ◽

pp. 126 ◽

Cited By ~ 1

Author(s):

Giuseppe Mazza ◽

Massimiliano Scalici ◽

Alberto Inghilesi ◽

Laura Aquiloni ◽

Tobia Pretto ◽

...

Keyword(s):

Positive Result ◽

Procambarus Clarkii ◽

Central Italy ◽

Ecosystem Restoration ◽

Restoration Project ◽

Cherax Destructor ◽

Baited Traps ◽

Natural Reserve ◽

Eastern Australia ◽

First Time

Cherax destructor is a crayfish endemic to south-eastern Australia and one of the last alien crayfish to be introduced in Italy. In the Laghi di Ninfa Natural Reserve (Latium region, Central Italy), the species was probably introduced in 1999, but only reported for the first time in 2008. Nearby this area, the most widespread alien crayfish is the red swamp crayfish Procambarus clarkii. In the Natural Reserve, between 2008 and 2013 and during spring and summer, crayfish sampling was carried out with baited traps to assess the distribution of C. destructor and its possible relationship with P. clarkii. Cherax destructor was first recorded in 2008; few P. clarkii were detected in the cultivation ponds where C. destructor was present in 2012 and 2013. Moreover, crayfish plague analyses evidenced a positive result in two out of the 12 sampled P. clarkii. Cherax destructor is now completely absent from the Natural Reserve, while P. clarkii has spread in the area and was probably responsible for this eradication since C. destructor is vulnerable to crayfish plague which was also detected in the area. An ecosystem restoration project in the area favoured the spread of. P. clarkii; the implications of this intervention are discussed.

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Population structure and dynamics of Procambarus clarkii (Girard, 1852) in a Mediterranean brackish wetland (Central Italy)

Biological Invasions ◽

10.1007/s10530-009-9557-6 ◽

2009 ◽

Vol 12 (5) ◽

pp. 1415-1425 ◽

Cited By ~ 35

Author(s):

Massimiliano Scalici ◽

Stefania Chiesa ◽

Stefano Scuderi ◽

Deborah Celauro ◽

Giancarlo Gibertini

Keyword(s):

Population Structure ◽

Procambarus Clarkii ◽

Central Italy ◽

Structure And Dynamics ◽

Population Structure And Dynamics

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The Lateral Giant Fiber to Motor Giant Fiber Synapse in Crayfish

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100094103 ◽

1972 ◽

Vol 30 ◽

pp. 170-171

Author(s):

Charles A. Stirling

Keyword(s):

Synaptic Vesicles ◽

Procambarus Clarkii ◽

Synaptic Contact ◽

Giant Fiber ◽

Synaptic Junctions

The lateral giant (LG) to motor giant (MoG) synapses in crayfish (Procambarus clarkii) abdominal ganglia are the classic electrotonic synapses. They have previously been described as having synaptic vesicles and as having them on both the pre- and postsynaptic sides of symmetrical synaptic junctions. This positioning of vesicles would make these very atypical synapses, but in the present work on the crayfish Astacus pallipes the motor giant has never been found to contain any type of vesicle at its synapses with the lateral giant fiber.The lateral to motor giant fiber synapses all occur on short branches off the main giant fibers. Closely associated with these giant fiber synapses are two small presynaptic nerves which make synaptic contact with both of the giant fibers and with their small branches.

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