First record of straight-needle pteropod Creseis acicula Rang, 1828 bloom in the Çanakkale Strait (NE Aegean Sea, Turkey)

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Average monthly number of vessels transiting the Istanbul and Çanakkale straits between April and July of each year from 2017 to 2020

Region	2017	2018	2019	2020
Çanakkale Strait	3728	3751	3599	3384
Istanbul Strait	3566	3500	3363	3134

Physicochemical parameters (temperature, salinity, pH and dissolved oxygen) measured at site 6c in the Çanakkale Strait during summer seasons from 2008 to 2020 (n = 11; significant correlation at p < 0_05 level) showing no significant Pearson correlation_

Parameter	SST	Sal	pH	DO
SST	1
p	-
Sal	0.07	1
p	0.85	-
pH	0.35	0.49	1
p	0.29	0.13	-
DO	0.57	0.15	0.11	1
p	0.07	0.65	0.75	-

Total length and operculum width of 39 individuals

Sample	Total length (mm)	Operculum width (mm)
1	7.05	0.42
2	7.1	0.51
3	7.25	0.36
4	7.27	0.54
5	7.44	0.57
6	7.56	0.51
7	7.6	0.43
8	7.69	0.48
9	7.69	0.48
10	7.7	0.52
11	7.82	0.58
12	7.91	0.53
13	8.1	0.55
14	8.11	0.51
15	8.11	0.6
16	8.62	0.53
17	8.63	0.53
18	8.76	0.51
19	8.83	0.51
20	8.9	0.57
21	8.97	0.54
22	9	0.54
23	9	0.56
24	9.1	0.61
25	9.14	0.5
26	9.2	0.57
27	9.35	0.6
28	9.41	0.65
29	9.42	0.62
30	9.47	0.62
31	9.74	0.58
32	9.84	0.58
33	10.27	0.67
34	10.3	0.7
35	10.30	0.65
36	10.31	0.71
37	10.44	0.66
38	11.38	0.67
39	13.03	0.73
Average	8.87	0.56
Min.	7.05	0.36
Max	13.03	0.73
SD	1.28	0.08