Abundance Of The Alien Spionid Streblospio gynobranchiata In Relation To Sediment Composition Along The Southern Coast Of The Caspian Sea

Abstract

Seasonal and inter-annual variations in the density of the invasive polychaete Streblospio gynobranchiata were noted in the south Caspian Sea when sediment conditions were examined at five and 14 meters depths in 2005 and 2010. There was no clear trend in changing density in line one but in line two, in all seasons except summer, density of S. gynobranchiata decreased significantly. Maximum densities of 2,040 ind./m−2 and 1,013 ind./m−2 were obtained in 2005 and 2010, respectively. Although the percentage of total organic matter as a food resource increased from 2005 to 2010, the density of S. gynobranchiata decreased slightly in the same period. It seems that in this invasion phase the population of S. gynobranchiata has decreased to a balance condition. There is evidence that the changing density of this species is also being affected by other biotic/abiotic factors like intra/interspecific competitors and pollutants.

A new species of Streblospio (Polychaeta: Spionidae) from the northern Adriatic Sea (Mediterranean Sea)

“…Only two of the known species of the genus Streblospio are reported in the Mediterranean Sea: Streblospio shrubsolii (Lardicci et al 1997;Munari 2013;Çinar et al 2014;Mikac 2015;Bevilacqua et al 2018;Mistri et al 2018), and S. gynobranchiata (Çinar et al 2005a, b, 2006, 2008, 2011a, 2012a, b, 2014Çinar 2013;Çinar & Dagli 2013;Dagli & Çinar 2008;Ergen et al 2006;Kurt-Sahin & Çinar 2012;Zenetos et al 2017), which is also recorded from the Black Sea (Radashevsky & Selifonova 2013, Boltachova et al 2015Selifonova & Bartsits 2018) and Caspian Sea (Taheri et al 2009;Taheri & Foshtomi 2011;Ghasemi et al 2014). In the present study we describe a new species of the genus Streblospio, Streblospio eridani n. sp.…”