Pseudodiaptomus marinus Sato, 1913 in the Black Sea: morphology, genetic analysis, and variability in seasonal and interannual abundance

PeerJ

article

Alexandra Gubanova¹  Inna Drapun¹  Oksana Garbazey¹  Olga Krivenko²  Ekaterina Vodiasova² 

[1] Plankton department, A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS;Marine biodiversity and functional genomics laboratory, A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS

关键词: Pseudodiaptomus marinus;    Non-indigenous species;    Black Sea;    Seasonal dynamics;    Sequence analysis;    cytb;    rRNA;    Morphology;   

DOI  :  10.7717/peerj.10153

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Calanoid copepod Peudodiaptomus marinus Sato, 1913 was first recorded in Sevastopol Bay in the northern Black Sea in September 2016. We performed regular observations of this new invasive species between October 2016 and December 2018. We conducted bi-weekly plankton sampling at three stations located within or adjacent to Sevastopol Bay. This is the first paper to combine (i) a detailed morphological study, (ii) molecular genetic analysis, and (iii) an investigation of P. marinus seasonal dynamics and interannual abundance variability in the coastal Black Sea. Our morphological research showed similarities between Pseudodiaptomus specimens and existing P. marinus illustrations and descriptions. Our morphological analysis results were confirmed using molecular genetic studies. Based on the genetic variability of ITS2 and cytb, we found that all investigated specimens from Sevastopol Bay belonged to P. marinus. Investigations of P. marinus seasonal and interannual abundance variability showed the same seasonal patterns throughout the studied period, with a higher seasonal abundance from October to November and one pronounced density peak in autumn. The highest abundances (2,000 ind m–3 at the mouth of the bay and more than 5,000 ind m–3at its centre) were recorded in November 2018. In the samples, we found adults of both sexes, including ovigerous females, copepodites I–V, and nauplii, suggesting that the species reproduce in Sevastopol Bay. Our research indicated that P. marinus is a new non-indigenous species (NIS) in the Black Sea, and we will discuss a possible vector of its introduction into this basin.

【 授权许可】

CC BY