Altukhov, D. A.

Gubanova, A. D.

Prusova, I. Yu.

English

A.O. Kovalevsky Institute of Marine Biological Research Open access repository

ЗАМЕТКА
Record of  Acartia margalefi Alcaraz, 1976 in the Sevastopol bay in 2007 [Обнаружение Acartia  
margalefi Alcaraz, 1976 в Севастопольской бухте в 2007 г.]. Acartia (Acartiura) margalefi Alcaraz, 
1976 was first found in the Black Sea in 1940 being identified as a small form of A. clausi Giesbrecht, 
1889 by Potemkina (1940) due to very similar morphological features.  A. margalefi was described as 
separate species by M. Alcaraz (1976) from Ria de Vaigo, north-west of Spain. Later, it was ascertained, 
that a small form of A. clausi from the Black Sea was actually A. margalefi (Belmonte, Mazzocchi, 1997). 
Long-term, regular studies of coastal plankton communities were started in 1976 and resumed in 2002, 
based  on  bi-weekly  plankton  casts  at  three  stations  located  within  and  adjacent  to  Sevastopol  Bay, 
Crimea, northern Black Sea. Samples were collected by vertical hauls through the whole water column 
using a Juday plankton net (mouth area 0.1 m2 and mesh size 150 μm). Zooplankton counts were made 
under a MBS-9 stereomicroscope in Bogorov counting chamber.  Appendages were dissected under a 
stereomicroscope and mounted in microscope slides for detailed examination. Specimens of A. margalefi 
Alcaraz, 1976 were found in the samples collected on 30 March 2007: four males at the station near the 
entrance to the Sevastopol Bay, three males and three females at the station near Sukharnaya Gully. All 
animals were in rather good state. Total body lengths of these specimens were: females, 0.75 – 0.76 mm; 
males,  0.69 – 0.70 mm. The recorded specimens fully correspond morphologically to the  Alcaraz’s 
(1976) description and to the specimens found in the Sevastopol Bay in 1976 and 1980.  A. margalefi 
differs from A. clausi in having no posterodorsal small spinules on urosome segments 2 and 3 in female 
and presence of inner process in segment 1 of right fifth leg in male (Fig. 1).  
        Figure  1.  Acartia 
margalefi male. Fifth leg. A – from Alcaraz, 1976; B – from Sevastopol Bay, 2007. Arrows indicate 
characteristic process on the first segment.
Рисунок 1.  Acartia margalefi,  самец,  пятая пара ног.  A –  по:   Alcaraz,  1976;  B –  из 
Севастопольской бухты,  2007 г.  Стрелки указывают на характерные выросты на первом 
сегменте. 
A. margalefi is usually registered in the coastal waters,  bays and estuaries (Alcaraz, 1976; Belmonte, 
Mazzocchi, 1997; Gubanova, 2004). In the Sevastopol Bay the species was rather abundant in 1976 and 
1980. For example, its density exceeded 20000 ind. /m3 in February,  1980 and it made up to 44% of 
average annual total copepods density (Gubanova, 2004). Since the 1990ies,  A. margalefi has not been 
found in the Black Sea (Gubanova et al.  2002). As yet,  present discovery of  A. margalefi appears to 
represent an isolated record that does not allow making any conclusions. However, it is reasonable to note 
that this species is able to produce resting eggs (Belmonte, 1991) and resting eggs may stay in diapause 
for tens of years (Belmonte, Rossi, 1998). Thus there is a probability that the first sign of recovering of A.  
margalefi population in the Sevastopol Bay was observed (Shadrin et al., 1999). D. A. Altukhov, A. D. 
Gubanova, I. Yu. Prusova (Institute of Biology of the Southern Seas, Sevastopol, Ukraine)
© D. A. Altukhov, A. D. Gubanova, I. Yu. Prusova, 2008
16                                                                    Экология  моря. 2008. Вып. 76 


Обнаружение Acartia margalefi Alcaraz, 1976 в Севастопольской бухте в 2007 г.

https://repository.marine-research.org/bitstream/299011/4810/1/16-16.pdf

Обнаружение Acartia margalefi Alcaraz, 1976 в Севастопольской бухте в 2007 г.

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