scholarly journals Has Dreissena polymorpha, an older immigrant in a coastal Baltic lagoon, responded to appearance of a new non-indigenous dreissenid?

2018 ◽  
Author(s):  
Brygida Wawrzyniak-Wydrowska ◽  
Anna Skrzypacz ◽  
Adam Wozniczka ◽  
Teresa Radziejewska
Keyword(s):  
Population Structure ◽  
Size Distribution ◽  
Zebra Mussel ◽  
Dreissena Polymorpha ◽  
Indigenous Species ◽  
Large Share ◽  
Szczecin Lagoon ◽  
The North ◽  
Clear Peak ◽  
Non Indigenous Species

Although a non-indigenous species, Dreissena polymorpha (zebra mussel) has constituted a constant and abundant component of the Szczecin Lagoon biota. A congeneric dreissenid, D. rostriformis bugensis (quagga), was first recorded in the north of the Lagoon in 2014, already in abundance. In summer 2015, the quagga dominated over the zebra mussel in abundance and biomass. Quagga individuals there were much larger than those of D. polymorpha, while elsewhere in the Lagoon the zebra mussel still dominated the dreissenid assemblages. In summer 2016, the population structure of D. r. bugensis was substantially modified and its abundance was greatly reduced. D. polymorpha became the dominant again. In terms of biomass, after the initial domination, D. r. bugensis biomass declined substantially. The zebra mussel, although represented mostly by small individuals, has become a biomass dominant too on account of its high abundance. As of mid-2016, there has been no clear peak (evidencing the appearance of juveniles) in the quagga size distribution. The recent dreissenid samples show a large share of empty quagga shells, an effect not observed earlier. Therefore, it is plausible that the older immigrant, so far at least, has outcompeted the newcomer.

scholarly journals Has Dreissena polymorpha, an older immigrant in a coastal Baltic lagoon, responded to appearance of a new non-indigenous dreissenid?

2018 ◽  
Author(s):  
Brygida Wawrzyniak-Wydrowska ◽  
Anna Skrzypacz ◽  
Adam Wozniczka ◽  
Teresa Radziejewska
Keyword(s):  
Population Structure ◽  
Size Distribution ◽  
Zebra Mussel ◽  
Dreissena Polymorpha ◽  
Indigenous Species ◽  
Large Share ◽  
Szczecin Lagoon ◽  
The North ◽  
Clear Peak ◽  
Non Indigenous Species

Although a non-indigenous species, Dreissena polymorpha (zebra mussel) has constituted a constant and abundant component of the Szczecin Lagoon biota. A congeneric dreissenid, D. rostriformis bugensis (quagga), was first recorded in the north of the Lagoon in 2014, already in abundance. In summer 2015, the quagga dominated over the zebra mussel in abundance and biomass. Quagga individuals there were much larger than those of D. polymorpha, while elsewhere in the Lagoon the zebra mussel still dominated the dreissenid assemblages. In summer 2016, the population structure of D. r. bugensis was substantially modified and its abundance was greatly reduced. D. polymorpha became the dominant again. In terms of biomass, after the initial domination, D. r. bugensis biomass declined substantially. The zebra mussel, although represented mostly by small individuals, has become a biomass dominant too on account of its high abundance. As of mid-2016, there has been no clear peak (evidencing the appearance of juveniles) in the quagga size distribution. The recent dreissenid samples show a large share of empty quagga shells, an effect not observed earlier. Therefore, it is plausible that the older immigrant, so far at least, has outcompeted the newcomer.

Seawater warming at the northern reach for southern species: Gulf of Genoa, NW Mediterranean

2017 ◽  
Vol 98 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Carlo Nike Bianchi ◽  
Francesco Caroli ◽  
Paolo Guidetti ◽  
Carla Morri
Keyword(s):  
Mediterranean Sea ◽  
Native Species ◽  
Indigenous Species ◽  
Ligurian Sea ◽  
The North ◽  
Nw Mediterranean ◽  
The Mediterranean ◽  
Non Indigenous Species ◽  
Southern Species ◽  
North Western

Global warming is facilitating the poleward range expansion of plant and animal species. In the Mediterranean Sea, the concurrent temperature increase and abundance of (sub)tropical non-indigenous species (NIS) is leading to the so-called ‘tropicalization’ of the Mediterranean Sea, which is dramatically evident in the south-eastern sectors of the basin. At the same time, the colder north-western sectors of the basin have been said to undergo a process of ‘meridionalization’, that is the establishment of warm-water native species (WWN) previously restricted to the southern sectors. The Gulf of Genoa (Ligurian Sea) is the north-western reach for southern species of whatever origin in the Mediterranean. Recent (up to 2015) observations of NIS and WWN by diving have been collated to update previous similar inventories. In addition, the relative occurrences of both groups of southern species have been monitored by snorkelling between 2009 and 2015 in shallow rocky reefs at Genoa, and compared with the trend in air and sea surface temperatures. A total of 20 southern species (11 NIS and 9 WWN) was found. Two WWN (the zebra seabream Diplodus cervinus and the parrotfish Sparisoma cretense) and three NIS (the SW Atlantic sponge Paraleucilla magna, the Red Sea polychaete Branchiomma luctuosum, and the amphi-American and amphi-Atlantic crab Percnon gibbesi) are new records for the Ligurian Sea, whereas juveniles of the Indo-Pacific bluespotted cornetfish Fistularia commersonii have been found for the first time. While temperature has kept on increasing for the whole period, with 2014 and 2015 being the warmest years since at least 1950, the number of WWN increased linearly, that of NIS increased exponentially, contradicting the idea of meridionalization and supporting that of tropicalization even in the northern sectors of the Mediterranean basin.

scholarly journals Life history traits of Neretva roach Rutilus basak (Heckel, 1843) (Pisces, Cyprinidae): Biological and ecological contribution for biodiversity conservation of freshwater fish.

2018 ◽  
Vol 76 (2) ◽  
pp. 66-71
Author(s):  
Pero Tutman ◽  
Sanja Matić-Skoko ◽  
Adem Hamzić ◽  
Jakov Dulčić ◽  
Branko Glamuzina
Keyword(s):  
Population Structure ◽  
Water Regime ◽  
Life History Traits ◽  
Scientific Literature ◽  
Adriatic Sea ◽  
Indigenous Species ◽  
Ecological Traits ◽  
Restricted Area ◽  
Hydrological Changes ◽  
Non Indigenous Species

Abstract This paper is a review of the relevant scientific literature on the present status, distribution, habitat, ecological traits, population structure and threats of Neretva roach Rutilus basak (Heckel, 1843). The species inhabits a restricted area of the Adriatic Sea watershed in Croatia and Bosnia and Herzegovina. The major threats are habitat loss caused by significant hydrological changes in the water regime in the area of distribution and the introduction of non-indigenous species. Still, R. basak is quite widespread and often abundant. Information brought together in this study will improve our knowledge about this species.

Benthic Habitats and the Effects of Fishing

2005 ◽  
Keyword(s):  
Great Lakes ◽  
Dreissena Polymorpha ◽  
Lake Michigan ◽  
Round Goby ◽  
Sidescan Sonar ◽  
Benthic Habitat ◽  
Indigenous Species ◽  
Dreissena Bugensis ◽  
Sensing Technology ◽  
Non Indigenous Species

Colonization by dreissenid mussels, <em>Dreissena polymorpha </em>(Zebra) and <em>Dreissena bugensis </em>(Quagga), is one of the more ecologically important events to occur in the Great Lakes during the last decade. Since their introduction into the Great Lakes, dreissenids have colonized both soft and hard substrates to depths of 80 m and reached average densities of 40,000 mussels m<sup>-2</sup> in the littoral zone. Because of high densities and widespread distribution, they have modified habitats for benthos and fishes and fostered growth and proliferation of non-indigenous species, such as the round goby and a Black Sea amphipod, <em>Echinogammarus</em>. In 2001, we used multibeam sonar to characterize the benthic habitat in Lake Michigan and acoustic remote sensing technology (sidescan sonar and acoustic bottom classification) to extend and extrapolate information on dreissenid distributions from spatially limited observations. These observations were combined with discrete in situ (video and SCUBA) observations in a geographic information system (GIS). We used this system to link dreissenid distribution with substrate type, morphology and depth. These data are critical inputs to modeling the ecological implications of dreissenid filtering on algal biomass and composition in the Great Lakes over changing environmental conditions.

Patterns in the Distribution and Abundance of Zebra Mussel (Dreissena polymorpha) in Rivers and Lakes in Relation to Substrate and Other Physicochemical Factors

1994 ◽  
Vol 51 (5) ◽  
pp. 1024-1036 ◽  
Author(s):  
Eric Mellina ◽  
Joseph B. Rasmussen
Keyword(s):  
New York ◽  
Zebra Mussel ◽  
Dreissena Polymorpha ◽  
Secchi Depth ◽  
Maximum Width ◽  
The North ◽  
Suitable Substrate ◽  
Physicochemical Factors ◽  
South Shore ◽  
Substrate Size

Using SCUBA and an in situ method of quantifying substrate characteristics, we describe patterns of zebra mussel (Dreissena polymorpha) distribution along the St. Lawrence and Hudson rivers and in Oneida Lake, New York, and develop empirical models for their abundance. Calcium-poor waters originating from rivers draining the Canadian Shield resulted in a complete lack of zebra mussel colonization along the north shore of the St. Lawrence River east of Montreal despite an abundance of suitable substrate. Calcium concentrations of 15 mg/L or less limited the distribution of zebra mussel. The entire south shore from Cornwall, Ontario, to île d'Orléans, Quebec, was colonized by zebra mussel wherever suitable substrate was found. Among the three systems, substrate size explained between 38 and 91% of the variability in density. Other factors such as Secchi depth, calcium concentration in the water, the presence of crayfish, native unionid abundance, and the maximum width of the river at the site increased the amount of explained variance across the different systems. A model based on substrate size also successfully explained patterns of zebra mussel abundance from published sources.

scholarly journals Remnant Freshwater Mussel Diversity in Rondeau Bay, Lake Erie

2016 ◽  
Vol 130 (1) ◽  
pp. 76
Author(s):  
Scott M. Reid ◽  
Victoria Kopf ◽  
Anita LeBaron ◽  
Todd J. Morris
Keyword(s):  
Zebra Mussel ◽  
Dreissena Polymorpha ◽  
Lake Erie ◽  
Coastal Wetland ◽  
Freshwater Mussel ◽  
Species At Risk ◽  
North Shore ◽  
The North ◽  
Viable Population ◽  
Substantial Decline

In 2014 and 2015, 27 sites in Rondeau Bay, Ontario, Canada, were surveyed for freshwater mussels. Rondeau Bay is a large coastal wetland on the north shore of Lake Erie. Twenty-three species were identified from 120 live mussels, 15 fresh whole shells, 329 weathered whole shells, and 1121 weathered valves. Live individuals of the following species were collected: Eastern Pondmussel (Ligumia nasuta; endangered in Canada), Giant Floater (Pyganodon grandis), Round Pigtoe (Pleurobema sintoxia;endangered in Canada), and Three-ridge (Amblema plicata). Fresh whole shells of the Mapleleaf (Quadrula quadrula; threatenedin canada) were also found. Most species (78%), including 7 species at risk, were collected only as weathered shells. These results indicate a substantial decline in freshwater mussel diversity since the Zebra Mussel (Dreissena polymorpha) invasion of Lake Erie. Evidence shows that a viable population of only Giant Floater remains.

scholarly journals An introgression breakthrough left by an anthropogenic contact between two ascidians

2021 ◽  
Author(s):  
Alan Le Moan ◽  
Charlotte Roby ◽  
Christelle Fraisse ◽  
Claire Daguin-Thiebaut ◽  
Nicolas Bierne ◽  
...  
Keyword(s):  
Regional Scale ◽  
Indigenous Species ◽  
North East ◽  
The North ◽  
Allopatric Divergence ◽  
In The Wild ◽  
Speciation Continuum ◽  
Non Indigenous Species ◽  
Evolutionary Consequences ◽  
First And Second Generation

Human-driven translocations of species have diverse evolutionary consequences such as promoting hybridization between previously geographically isolated taxa. This is well-illustrated by the solitary tunicate, Ciona robusta, native to the North East Pacific and introduced in the North East Atlantic. It is now co-occurring with its congener C. intestinalis in the English Channel, and C. roulei in the Mediterranean Sea. Despite their long allopatric divergence, first and second generation crosses showed a high hybridization success between the introduced and native taxa in the laboratory. However, previous genetic studies failed to provide evidence of recent hybridization between C. robusta and C. intestinalis in the wild. Using SNPs obtained from ddRAD-sequencing of 397 individuals from 26 populations, we further explored the genome-wide population structure of the native Ciona taxa. We first confirmed results documented in previous studies, notably i) a chaotic genetic structure at regional scale, and ii) a high genetic similarity between C. roulei and C. intestinalis, which is calling for further taxonomic investigation. More importantly, and unexpectedly, we also observed a genomic hotspot of long introgressed C. robusta tracts into C. intestinalis genomes at several locations of their contact zone. Both the genomic architecture of introgression, restricted to a 1.5 Mb region of chromosome 5, and its absence in allopatric populations suggest introgression is recent and occurred after the introduction of the non-indigenous species. Overall, our study shows that anthropogenic hybridization can be effective in promoting introgression breakthroughs between species at a late stage of the speciation continuum.

Assessment of Zebra Mussel (Dreissena Polymorpha) Infestation Risk Using GIS for Water Basins in the North-West Bulgaria

2007 ◽  
Author(s):  
Teodora A. Trichkova ◽  
Alexander A. Kotsev ◽  
Anton Popov ◽  
Mladen T. Zivkov ◽  
Dimitar S. Kozuharov ◽  
...  
Keyword(s):  
Zebra Mussel ◽  
Dreissena Polymorpha ◽  
North West ◽  
The North
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