Non-indigenous tanaid Sinelobus vanhaareni Bamber, 2014 in the Polish coastal waters – an example of a successful invader

Brzana, Radosław; Marszewska, Lena; Normant-Saremba, Monika; Błażewicz, Magdalena

doi:10.1515/ohs-2019-0008

Figures & Tables

Locations of the sampling sites. GIS layers used for drawing the map were obtained from the GIS Centre of the University of Gdańsk.

Non-native and native representatives of Tanaidacea collected in the Gulf of Gdansk, S. vanhaareni: A – female, B – male, C – pleon and H. oerstedii: D – female, E – male, F – pleon (P – pleonite; PT – pleotelson). The scale bar on photograph A applies to photographs B, D and E as well.

Abundance of Sinelobus vanhaareni, information on the main associated taxa and key environmental parameters at the study sites in Polish coastal waters_ Numbers in brackets before sites’ names in the first column refer to those given in Fig_ 1 (T – temperature, S – salinity)_

Site	Sampling date	Abundance (max)	T (°C)	S (PSU)	Depth (m)	Substrate/sampling method	Main associated taxa
(1) Port of Gdynia	July 2014 (first record)	3530 ind. m⁻²	22.0	6.9	1–3	Horizontal artificial hard bottom (settlement plates)	Amphibalanus improvisus Gonothyraea loveni Cordylophora caspia
	Sept. 2014	47 400 ind. m⁻²	19.0	7.0	1–7	Horizontal artificial hard bottom (settlement plates)	Amphibalanus improvisus Gonothyraea loveni Einhornia crustulenta
	Oct. 2014	37 000 ind. m⁻²	16.3	7.1	1–7	Horizontal artificial hard bottom (settlement plates)	Amphibalanus improvisus Gonothyraea loveni Einhornia crustulenta
	Oct. 2014	100 per trap	16.1	7.1	9	Artificial habitat collector	Leptocheirus pilosus Melita nitida Apocorophium lacustre
	July 2015	500 per trap	No data	6.9	9	Artificial habitat collector	Mytilus trossulus Leptocheirus pilosus Melita nitida
	Jan. 2016	100 ind. m⁻²	1.7	7.3	14	(Soft sediment Van Veen grab)	Oligochaeta Polychaeta Limecola balthica Cerastoderma glaucum
	June 2016	1 per trap	19.2	6.9	9	Artificial habitat collector	Oligochaeta Polychaeta Amphipoda Jaera spp.
	Aug. 2016	10 ind. m⁻²	21.1	7.1	14	Soft sediment (Van Veen grab)	Oligochaeta Polychaeta Amphibalanus improvisus Limecola balthica Mytilus trossulus
(2) Gdynia Babie Doły	July 2015	3825 ind. m⁻²	18.6	6.4	2–8	Vertical concrete walls of a man-made offshore structure (Kautsky sampler)	Mytilus trossulus Amphibalanus improvisus Amphipoda
(2) Gdynia Babie Doły	July 2015	358 ind. m⁻²	18.6	6.4	8	Natural boulders up to 1 m diameter (Kautsky sampler)	Mytilus trossulus Amphibalanus improvisus Leptocheirus pilosus
(3) Jastarnia	March 2016	1133 ind. m⁻²	4.0	6.7	2–4	Vertical concrete walls of a man-made offshore structure (Kautsky sampler)	Mytilus trossulus Amphibalanus improvisus Amphipoda
(4) Naval Base in Hel	April 2016	No data	4.2	6.5	2–5	Vertical concrete walls of a breakwater (Kautsky sampler)	Mytilus trossulus Amphibalanus improvisus Gammarus spp.
(5) Gdańsk National Sailing Centre	May 2016	No data	19	4.9	2–4	Verfical man-made concrete piles(Kautsky sampler)	Mytilus trossulus Amphibalanus improvisus
(6) Gdynia Orłowo	June 2016	1791 ind. m⁻²	6.1	6.5	5	Natural boulders up to 1 m diameter (Kautsky sampler)	Mytitrossulus Amphibalanus improvisus Heterotanais oerstedii
(7) Port of Hel	Sept. 2017	60 per trap	18.1	7.2	2	Artificial habitat collectors	Hydrobiidae Jaera spp. Mytilus trossulus Heterotanais oerstedii
(8) ORP “Bryza” Shipwreck	Jan. 2016	Not present	4.0	7.2	12	Steel plating of a shipwreck (Kautsky sampler)	Mytilus trossulus Amphibalanus improvisus Amphipoda Jaera spp.
(8) ORP “Bryza” Shipwreck	April 2018	Not present	3.9	7.2	12–16	Steel plating of a shipwreck (Kautsky sampler)	Mytilus trossulus Amphibalanus improvisus Amphipoda Jaera spp.
(9) Słupsk Bank	Jan. 2018	Not present	3.6	7.3	14	Natural boulders up to 2 m diameter (Kautsky sampler)	Mytilus trossulus Amphibalanus improvisus Amphipoda Jaera spp.
March 2018	Not present	4.0	7.3	14		Natural boulders up to 2 m diameter (Kautsky sampler)	Mytilus trossulus Amphibalanus improvisus Amphipoda

Comparison of the main taxonomic features used to distinguish S_ vanhaareni from H_ oerstedii (Haaren & Soors 2009; Bamber 2014; personal observations)

Feature	Sinelobus vanhaareni Bamber, 2014	Heterotanais oerstedii (Krøyer, 1842)
Max body length	3.0 mm	2.0 mm
External pigmentati on	Dark mottling on dorsal surface of the entire body	Creamy white body with no mottling
Thorax	Pereonites rounded or trapezoidal in shape, which creates notched lateral edges of the animal	Pereonites more rectangular in shape, which makes the notching less visible
Pleon	4 pleonites and pleotelson	5 pleonites and pleotelson
	Each of pleonites 1–3 twice as long as pleonite 4	Pleonites 1–5 subequal in length
	Pleonite 1 narrowed anteriorly, which makes the entire pleon well pronounced	Pleonite 1 rectangular in shape, which makes the entire pleon less distinct
	3 pairs of ventral pleopods on pleonites 1–3	5 pairs of ventral pleopods on pleonites 1–5
	Two rows of plumose setae on dorsal side of pleonites 1–3	No plumose setae on dorsal side of pleon

Non-indigenous tanaid Sinelobus vanhaareni Bamber, 2014 in the Polish coastal waters – an example of a successful invader

Figures & Tables

Figure 1

Figure 2

Abundance of Sinelobus vanhaareni, information on the main associated taxa and key environmental parameters at the study sites in Polish coastal waters_ Numbers in brackets before sites’ names in the first column refer to those given in Fig_ 1 (T – temperature, S – salinity)_

Comparison of the main taxonomic features used to distinguish S_ vanhaareni from H_ oerstedii (Haaren & Soors 2009; Bamber 2014; personal observations)

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