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, FL SI

20

FL, FP

20

FL, PB

19

1

FL, KB

4

BDA, BS

8

7

2

1

1

1

BDA, NS

4

7

9

BDA, BI

5

9

1

2

2

1

Totals

63

1

17

16

9

8

2

2

2

2

1

1

F

F

B

B

B

B

B

B

B

B

B

B

L

L

D

D

D

D

D

D

D

D

D

D

1

2

A

A

A

A

A

A

A

A

A

A

1

2

3

4

5

6

7

8

9

1

GULF STREAM SYSTEM LASAEA

Table 2 Relative distribution of the 12 western North Atlantic Lasaea COI genotypes among the 7 sampling locations

399

The prefixes FL and BDA respectively indicate haplotypes found in Floridian and B Beach; KB: Key Biscayne; BS: Biological Station; NS: North Shore; BI: Boaz Island. for Key Biscayne, where only four specimens were obtained.

ermudan populations. SI: Sebastian Inlet; FP: Fort Pierce; PB; Palm Twenty individuals were sequenced from each sampling site except

revealed 10 variable sites and 12 haplotypes (Table 1). Of the 11 nucleotide substitutions (all synonymous) detected, 8 were third codon transitions, 2 were first codon transitions, and 1 was a third codon transversion. Genetic divergence levels among the haplotypes was very low, with a maximum of four substitutions (0.6%) among pairwise comparisons. Floridian and Bermudan haplotypes exhibited one diagnos- tic third codon transition—i.e., no haplotype was shared among these two regional groupings. Table 2 shows the

distribution pattern of the 12 haplotypes among the seven sampling sites. There was a striking discrepancy in the relative levels of haplotypic diversity and frequency in the Bermudan and Floridian samples. A total of 10 mt geno- types were contained in the combined oceanic island sam- ples, none of which exceeded a frequency of 0.28. With the exception of a single individual from the Palm Beach pop- ulation, the Floridian specimens were monomorphic for haplotype FL1.

0

Figure 2. Unrooted phylograms of the 10 Bermudan (a) and 12 western Atlantic (b) Lasaea COI genotypes encountered in this study. Prefixes BDA and FL respectively identify Bermudan and Floridian lineages, and values underneath lineage titles indicate the relative outgroup weighting calculated for that haplotype. The diameter of the shaded spherical symbol associated with each haplotype is proportional to its relative frequency in the respective data sets (Table 2).

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