scholarly journals Invasive species in the context of climate change: the case of Magallana Gigas (Thunberg, 1793) in the Black Sea

2021 ◽  
Author(s):  
Ana-Maria Krapa ◽  
◽  
Elena Buhaciuc-Ionita ◽  
Marian Ionita ◽  
Elena Iulia Iorgu ◽  
...  
Keyword(s):  
Climate Change ◽  
Invasive Species ◽  
Black Sea ◽  
Species Distribution ◽  
Climate Changes ◽  
Pacific Oyster ◽  
Current Situation ◽  
The Black Sea ◽  
Current Climate ◽  
The Pacific

The current climate changes are having a significant impact on species distribution. While some species are affected, others are thriving in these new conditions, expanding their range. This is also the case of some invasive species who seem to benefit from these changes. The invasive Pacific oyster Magallana gigas is among these species. The current situation of the Pacific oyster in the Black Sea is discussed, with new data from the Romanian waters.

Mitochondrial DNA Barcoding of the Pacific Oyster Crassostrea gigas (Thunberg, 1793) (Mollusca: Bivalvia: Ostreidae), Cultivated in the Black Sea

2018 ◽  
Vol 54 (12) ◽  
pp. 1445-1451
Author(s):  
Yu. V. Slynko ◽  
E. E. Slynko ◽  
A. V. Pirkova ◽  
L. V. Ladygina ◽  
V. I. Ryabushko
Keyword(s):  
Mitochondrial Dna ◽  
Dna Barcoding ◽  
Black Sea ◽  
Crassostrea Gigas ◽  
Pacific Oyster ◽  
The Black Sea ◽  
The Pacific

scholarly journals Wild Pacific oyster Magallana gigas (Thunberg, 1793) populations in Romanian Black Sea waters – friend or foe?

2019 ◽  
Vol 62 (2) ◽  
pp. 175-183
Author(s):  
Ana-Maria Krapal ◽  
Marin Ioniță ◽  
Mihaela Caplan ◽  
Elena Buhaciuc-Ioniță
Keyword(s):  
Dna Barcoding ◽  
Black Sea ◽  
Pacific Oyster ◽  
Small Population ◽  
The Black Sea ◽  
Morphological Identification ◽  
Oyster Population

A relatively small population of Magallana gigas was discovered near the Agigea harbor (Constanța, Romania) in 2017. The DNA barcoding method was used to confirm the morphological identification of the species. We consider this colony to be the first instance of a possibly stable Pacific oyster population in the Black Sea, outside of farming activities. The possible impact on native ecosystems is briefly discussed.

scholarly journals Decline of unique Pontocaspian biodiversity in the Black Sea Basin: a review

2021 ◽  
Author(s):  
Aleksandre Gogaladze ◽  
Mikhail Son ◽  
Matteo Lattuada ◽  
Vitaliy Anistratenko ◽  
Vitaly Syomin ◽  
...  
Keyword(s):  
Black Sea ◽  
Species Distribution ◽  
The Black Sea ◽  
Distribution Data ◽  
Past Century ◽  
Detailed Knowledge ◽  
The Past ◽  
Mollusc Species ◽  
Anthropogenic Threats ◽  
Effective Conservation

Aim The unique aquatic Pontocaspian (PC) biota of the Black Sea Basin (BSB) is in decline. Lack of detailed knowledge on the status and trends of species, populations and communities hampers a thorough risk assessment and precludes effective conservation. This paper aims to review PC biodiversity trends using endemic molluscs as a model group. We aim to assess changes in PC habitats, community structure and species distribution over the past century and to identify direct anthropogenic threats. Location Black Sea Basin (Bulgaria, Romania, Moldova, Ukraine and Russia). Methods Presence/absence data of target mollusc species was assembled from literature, reports and personal observations. PC biodiversity trends in the NW BSB coastal regions were established by comparing 20th and 21st century occurrences. Direct drivers of habitat and biodiversity change were identified and documented. Results A very strong decline of PC species and communities during the past century is driven by a) damming of rivers, b) habitat modifications negatively affecting salinity gradients, c) pollution and eutrophication, d) invasive alien species and e) climate change. Four out of 10 studied regions, namely, the Danube Delta – Razim Lake system, Dniester Liman, Dnieper-South Bug Estuary and Taganrog Bay-Don Delta contain the entire spectrum of ecological conditions to support PC communities and still host threatened endemic PC mollusc species. Distribution data is incomplete, but the scale of deterioration of PC species and communities is evident from the assembled data, as are major direct threats. Main conclusions PC biodiversity in the BSB is profoundly affected by human activities. Standardised observation and collection data as well as precise definition of PC biota and habitats are necessary for targeted conservation actions. This study will help to set the research and policy agenda required to improve data collection to accommodate effective conservation of the unique PC biota.

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