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Table 1 Coordinates of the studied locations with the approximate total area of the seaweed bed in km2 between brackets, historical background concerning exploitation of the natural seaweed bed and the average relative abundance of P. gynodiporata sp. n. in the respective locations. Haplotype occurrence per beach and h (haplotype diversity), π (nucleotide diversity), Tajima’s D and Fu’s Fs neutrality test values with the corresponding p-values between brackets of the studied populations at the northeastern Brazilian coast

From: Low genetic but high morphological variation over more than 1000 km coastline refutes omnipresence of cryptic diversity in marine nematodes

Beach

Coordinate

Seaweed

Historical background

P. gynodiporata sp. n. Rel. Abund.

n° haplotype

Year

n

h

π

D

Fs

Flecheiras(CE)

(1.49 km2)

3°13′08″S 39°16′18″W

Gracilaria

Exploited

15.56 ± 6.39

5 (F1, F2, C7, C8, PV2)

2013

27

0.5783 ± 0.0961

0.0034 ± 0.0024

−0.3561 (0.3920)

0.0766 (0.5110)

Muriú(RN)

(1.86 km2)

5°33′43″S 35°14′21″W

Gracilaria

Exploited

26.73 ± 8.31

4 (M1, M2, M3, C8)

2013

24

0.3080 ± 0.1180

0.0008 ± 0.0009

−1.4943 (0.0430)

−2.3829 (0.0030)

Cupe(PE)

(0.30 km2)

8°27′29″S 34°58′58″W

Sargassum

Not exploited

37.73 ± 7.16

6 (M2, C2, C5, C7, C8, C9) - (C3, C4, C6, C7, C8, C10)

2011-2012

33 - 25

0.3667 ± 0.122 - 0.3807 ± 0.1058

0.0012 ± 0.0012- 0.0011 ± 0.0011

−2.0875 (0.0040)

-1.6480 (0.0160)

−4.3714 (0.0000)

-4.0239 (0.0000)

P. Verde(AL)

(4.54 km2)

9°39′55″S 35°41′54″W

Sargassum

Not exploited

22.95 ± 2.47

5 (PV1, PV2, PV3, C4, C8)

2012

20

0.3684 ± 0.1351

0.0019 ± 0.0016

−1.9723 (0.0130)

−1.7287 (0.0590)

  1. Abbreviation: Rel. Abund relative abundance