Spatial distribution and substrate preferences of the non-indigenous amphipod Gammarus roeselii Gervais, 1835

2020 ◽  
Vol 71 (7) ◽  
pp. 723
Author(s):  
Daniele Paganelli ◽  
Alessandra Pandolfi ◽  
Renato Sconfietti ◽  
Agnese Marchini
Keyword(s):  
Spatial Distribution ◽  
River Basin ◽  
Laboratory Experiments ◽  
Northern Italy ◽  
Indigenous Species ◽  
Swimming Ability ◽  
Substrate Preferences ◽  
Inorganic Substrates ◽  
Almost All ◽  
Non Indigenous Species

Gammarus roeselii is one of the successful non-indigenous species recently established in the Ticino River basin (Northern Italy). G. roeselii is not usually considered to be a real threat to native gammarids because no evidence has been reported so far on its effects on biodiversity and habitats. In this study, we assessed the spatial distribution of G. roeselii in the secondary hydrographic system of the southern part of the sub-lacustrine Ticino River basin and examined substrate preferences on the basis of laboratory experiments. We found that G. roeselii is well established in this area, occurring in almost all the seminatural streams, reaching high densities. Furthermore, we found that this species has a preference for two distinct types of substrate: empty shells of the bivalve Corbicula fluminea, which provide a suitable shelter for the introduced amphipod, and aquatic plants, which provide food resources. Conversely, preference for inorganic substrates, such as stones, was lower. In addition, the results indicate that G. roeselii easily inhabits the water column. The high adaptability of G. roeselii, combined with its capacity to exploit different niches and its swimming ability, are ecological characteristics that can favour its colonisation of new areas.

scholarly journals Seasonal and bathymetric effects on macrofouling invertebrates’ primary succession in a mediterraenan non-indigenous species hotspot area

2018 ◽  
Vol 19 (3) ◽  
pp. 572 ◽  
Author(s):  
MARCO LEZZI ◽  
ADRIANA GIANGRANDE
Keyword(s):  
Community Development ◽  
Species Interactions ◽  
Primary Succession ◽  
Mytilus Galloprovincialis ◽  
Abundant Species ◽  
Artificial Substrates ◽  
Indigenous Species ◽  
Central Mediterranean ◽  
Almost All ◽  
Non Indigenous Species

The present study investigates macrofouling development in the Mar Grande of Taranto (Central Mediterranean Sea), a wide confined area that has attracted considerable attention in recent years due to the establishment of numerous non-indigenous species (NIS). Different starting times of a yearly primary succession on artificial substrates were tracked so as to investigate the matching of the development pattern with contingency and/or convergence models, identifying NIS’s structural role in the community endpoint. Our results show that during the experiment all assemblages tended to converge towards multiple contingent communities according to starting times and depths. The differences are due to propagule availability which influence further species interactions. Thus the endpoint patterns are defined by a contingent community development determined by the seasonal species pool, their phenologies, pre- and post-settlement events, and species interactions. The most important structuring species was Mytilus galloprovincialis, which was present in almost all the endpoint assemblages, in particular when it recruits at early stages of the community development. Another abundant species at the endpoint was the alien Branchiomma boholense; which was a persistent structural component contributing to an alternative state in which Mytilus galloprovincialis loses its structural importance and where B. boholense becomes dominant, leading to an increase in fouling biodiversity of the endpoint assemblage.

scholarly journals First record of eyeless specimens of Gammarus roeselii Gervais 1835 (Amphioda, Gammaridae) in a small stream of the sub-lacustrine Ticino River basin (Lombardy, Northern Italy)

2017 ◽  
Vol 4 (1) ◽  
pp. 105
Author(s):  
Daniele Paganelli ◽  
Alessandra Pandolfi ◽  
Renato Sconfietti
Keyword(s):  
Genetic Variability ◽  
Exotic Species ◽  
River Basin ◽  
Short Communication ◽  
First Record ◽  
Northern Italy ◽  
Po River ◽  
Small Stream ◽  
River Floodplain ◽  
Almost All

In this short communication, we report the unusual presence of blind specimens of the non-native <em>Gammarus</em> <em>roeselii</em> Gervais 1835 (Amphioda, Gammaridae) in the sub-lacustrine Ticino River basin (Po River floodplain, Northern Italy). Considering that <em>G</em>. <em>roeselii</em> is present in almost all small semi-natural tributaries of the Ticino River, it is important to carry out further research on this well-established exotic species to verify its genetic variability.

scholarly journals An additional record of the non-indigenous species (NIS) Seriola fasciata from the southern coast of Sicily (Central Mediterranean Sea)

2020 ◽  
Vol 61 (2) ◽  
pp. 223-230
Author(s):  
Michele Luca Geraci ◽  
Fabio Falsone ◽  
Danilo Scannella ◽  
Sergio Vitale
Keyword(s):  
Spatial Distribution ◽  
Mediterranean Sea ◽  
Indigenous Species ◽  
Southern Coast ◽  
Central Mediterranean ◽  
Seriola Dumerili ◽  
Central Mediterranean Sea ◽  
Greater Amberjack ◽  
Non Indigenous Species

An additional record of the non-indigenous species (NIS) Seriola fasciata from the southern coast of Sicily (Central Mediterranean Sea) is here described in this note. The catch record is the first in the area and confirms the key role of the area for NIS spreading. In addition, an updated map of its spatial distribution is provided as well as a discussion on the possible misidentification and competition with the native greater amberjack Seriola dumerili.

The seaweed resources of Portugal

2019 ◽  
Vol 62 (5) ◽  
pp. 499-525 ◽  
Author(s):  
Rui Gaspar ◽  
Leonel Pereira ◽  
Isabel Sousa-Pinto
Keyword(s):  
18Th Century ◽  
Latitudinal Gradients ◽  
Indigenous Species ◽  
Valuable Resource ◽  
Research Groups ◽  
The Past ◽  
Role Players ◽  
Portuguese Higher Education ◽  
Almost All ◽  
Non Indigenous Species

Abstract Continental Portugal and its two archipelagos (Azores Islands and Madeira Islands) present a very interesting and diverse seaweed community. Its great diversity results for example from different environmental conditions such as the latitudinal gradients that affect the continental Portugal coastal shoreline in unique ways. The first Portuguese phycological studies published date from the end of the 18th century and seaweeds have been harvested to be used as fertilizer since at least the 14th century. However, Portuguese seaweeds are still a natural and valuable resource that is relatively under explored or studied, particularly regarding its economic potential. Although Portugal was one of the world’s main agar producers in the past, the sustainability of its seaweed exploitation was overlooked. Contemporary awareness of this valuable resource might bring together role players such as researchers and industries towards innovative and sustainable practices (such as to make use of non-indigenous species that have been registered in the country). Nowadays, almost all Portuguese higher education institutions currently have research groups dedicated to studies related to seaweeds (ranging from ecological and environmental assessment studies to seaweed aquaculture, uses and applications). This work addresses the diversity of Portuguese seaweeds and its main economic aspects.

Assessment of Groundwater Geochemistry of Vel River basin, Western Maharashtra, India

2020 ◽  
Vol 4 (1) ◽  
pp. 14-28
Author(s):  
S. K. Gaikwad ◽  
N. D. Pathan ◽  
N. S. Bansode ◽  
S. P. Gaikwad ◽  
Y. P. Badhe ◽  
...  
Keyword(s):  
River Basin ◽  
Anthropogenic Activities ◽  
Geochemical Data ◽  
Total Hardness ◽  
Groundwater Geochemistry ◽  
Average Value ◽  
Rock Water Interaction ◽  
Good For ◽  
Almost All ◽  
Geological Control

To study the chemistry of major ion in groundwater from Vel (Velu) River basin, sixty (60) samples of dug wells and bore wells were collected and analyzed using standard techniques given by APHA. It shows order of dominance for cations, Na+ > Ca2+ > Mg2+ > K+ and in anionic concentration as HCO3- > Cl- > SO42- in groundwater. The pH of groundwater is slightly alkaline (range: pH 7.0 - 8.1), while average values of Electrical Conductivity (EC) is about 2641 µS/cm indicating high mineralization of groundwater. In general, the cationic concentration (Na+, K+, Ca2+ and Mg2+) of the groundwater increase in the downstream side (from Northwest to South east), suggesting geological control on the composition of groundwater while highest concentration is in lower part of the basin are generally associated with the high salinity. In the major anions, bicarbonate (HCO3-) is higher due to rock-water interaction. Average value of chloride is about of 235 mg/L due to discharge zones along with anthropogenic activities. The geochemical data plotted on Piper Trilinear Diagram is showing dominant hydro-chemical facies: Ca2++Mg2+, Na++ K+, Cl-+ SO42- -HCO3- found in 83.3 % samples indicating the alkaline earth exceeding the alkalis and the strong acids exceeds the weak acids. The pH, Total Hardness (TH) and Magnesium (Mg2+) of the samples show more proportion of samples falling above desirable limit. Otherwise the quality of groundwater is good for drinking. The irrigation indices like SAR, KR and SSP were considered to evaluate groundwater suitability for irrigation. Comparing with SAR parameter all samples are excellent to good for irrigation. In SSP, 33.3 % samples are within permissible, while 66.6% samples are doubtful for irrigation purpose. In KR almost all samples (excluding 04 samples in lower side of basin) are suitable for irrigation. So, variations in climate, geology with anthropogenic activities are modifying the groundwater geochemistry of Vel River Basin.

scholarly journals Double parton distributions in the pion from lattice QCD

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Gunnar S. Bali ◽  
Luca Castagnini ◽  
Markus Diehl ◽  
Jonathan R. Gaunt ◽  
Benjamin Gläßle ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Lattice Qcd ◽  
Quark Mass ◽  
Matrix Elements ◽  
Parton Distributions ◽  
Almost All ◽  
The Relationship

Abstract We perform a lattice study of double parton distributions in the pion, using the relationship between their Mellin moments and pion matrix elements of two local currents. A good statistical signal is obtained for almost all relevant Wick contractions. We investigate correlations in the spatial distribution of two partons in the pion, as well as correlations involving the parton polarisation. The patterns we observe depend significantly on the quark mass. We investigate the assumption that double parton distributions approximately factorise into a convolution of single parton distributions.

Meta-analysis on the ecological impacts of widely spread non-indigenous species in the Baltic Sea

2021 ◽  
pp. 147375
Author(s):  
Henn Ojaveer ◽  
Jonne Kotta ◽  
Okko Outinen ◽  
Heli Einberg ◽  
Anastasija Zaiko ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Meta Analysis ◽  
Ecological Impacts ◽  
Indigenous Species ◽  
The Baltic Sea ◽  
The Baltic ◽  
Non Indigenous Species

scholarly journals First Record of the Alien Species Procambarus virginalis Lyko, 2017 in Fresh Waters of Sardinia and Insight into Its Genetic Variability

Life ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 606
Author(s):  
Daria Sanna ◽  
Ilenia Azzena ◽  
Fabio Scarpa ◽  
Piero Cossu ◽  
Angela Pira ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Alien Species ◽  
Procambarus Clarkii ◽  
Mitochondrial Gene ◽  
First Record ◽  
Indigenous Species ◽  
Fresh Waters ◽  
Mediterranean Island ◽  
Marbled Crayfish ◽  
Non Indigenous Species

In the fresh waters of Sardinia (Italy), the non-indigenous crayfish species Procambarus clarkii has been reported from 2005, but, starting from 2019, there have been several reports of a new non-indigenous crayfish in southern and central areas of this Mediterranean island, and its morphology suggests that this species may be the marbled crayfish Procambarus virginalis. Forty-seven individuals of this putative species were analyzed, using the mitochondrial gene Cytochrome c Oxidase subunit I as molecular marker to identify this crayfish and investigate the level of genetic variability within the recently established population. Phylogenetic and phylogeographic analyses were carried out on a dataset including sequences from the Sardinian individuals and from all congenerics available in GenBank. Results showed that the new Sardinian crayfish belong to the species P. virginalis. All the sequences belonging to P. virginalis from European countries are identical, with only few exceptions found among Sardinian individuals. In conclusion, this paper highlights the occurrence of a new further alien species in the Sardinian fresh waters, which are already characterized by the high presence of non-indigenous species.

scholarly journals Contrasted Epidemiological Patterns of West Nile Virus Lineages 1 and 2 Infections in France from 2015 to 2019

Pathogens ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 908 ◽  
Author(s):  
Cécile Beck ◽  
Isabelle Leparc Goffart ◽  
Florian Franke ◽  
Gaelle Gonzalez ◽  
Marine Dumarest ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
West Nile Virus ◽  
Invasive Disease ◽  
Northern Italy ◽  
Breaking Point ◽  
Organ Donors ◽  
West Nile ◽  
Organ Donations ◽  
History Of ◽  
Lineage 2

Since 2015, annual West Nile virus (WNV) outbreaks of varying intensities have been reported in France. Recent intensification of enzootic WNV circulation was observed in the South of France with most horse cases detected in 2015 (n = 49), 2018 (n = 13), and 2019 (n = 13). A WNV lineage 1 strain was isolated from a horse suffering from West Nile neuro-invasive disease (WNND) during the 2015 episode in the Camargue area. A breaking point in WNV epidemiology was achieved in 2018, when WNV lineage 2 emerged in Southeastern areas. This virus most probably originated from WNV spread from Northern Italy and caused WNND in humans and the death of diurnal raptors. WNV lineage 2 emergence was associated with the most important human WNV epidemics identified so far in France (n = 26, including seven WNND cases and two infections in blood and organ donors). Two other major findings were the detection of WNV in areas with no or limited history of WNV circulation (Alpes-Maritimes in 2018, Corsica in 2018–2019, and Var in 2019) and distinct spatial distribution of human and horse WNV cases. These new data reinforce the necessity to enhance French WNV surveillance to better anticipate future WNV epidemics and epizootics and to improve the safety of blood and organ donations.

Sign in / Sign up

Export Citation Format

Share Document