Page 119 - 《水产学报》2025年第8期

林悦彤，等 水产学报, 2025, 49(8): 089310

150 from HWE, which were associated with a defi-
b a ciency of heterozygotes, as indicated by positive F is
shell length/mm 100 values. Heterozygote deficiency seems to be a gen-
a
[28-30]
eral characteristic of marine bivalves
. The mean
50
value of A from our results ranged from 7.00 (JJ) to
r
7.12 (SS), which is superior to the values obtained
0 for M. coruscus in the Republic of Korea (4.90-
SS JJ FD
[31]
5.50) and other marine bivalves, such as
population
[29]
Ruditapes decussatus (5.86-6.19) , but lower than
(a)
the values reported for C. nippona (7.28-10.07) [16]
200 [32]
and Hyriopsis cumingii (8.358-10.109) .
b The H values obtained in this study (0.570-
150
e
wet weight/g 100 a c 0.630) were comparable to or slightly higher than
those reported for M. coruscus in the Republic of
[31]
Korea (0.540-0.552) and lower than other bivalve
50
[29]
species, including R. decussatus (0.627-0.664) , P.
0 [33]
SS JJ FD yessoensis (0.666-0.676) , P. trituberculatus (0.692-
[27]
[17]
population 0.714) , and C. gigas (0.82-0.85) . In contrast,
(b) the H values obtained in this study (0.39-0.44)
o
were notably lower than those for M. coruscus in
1.0
[31]
1 0.776 0 −0.209 0 0.127 8 0.030 0 0.075 3 the Republic of Korea (0.521-0.534) , R. decus-
[29]
satus (0.608-0.675) , P. yessoensis (0.521-
[33]
[27]
2 * 0.015 0 0.192 8 0.142 6 0.283 1 0.523) , P. trituberculatus (0.624-0.654) , and C.
[17]
gigas (0.74-0.79) . Compared to the results from
3 * −0.249 1−0.119 8 −0.115 7 0.5
other studies, microsatellites revealed low levels of
4 * * 0.531 2 0.368 7 genetic diversity in the three wild M. coruscus pop-
ulations. This may be attributed to aquaculture
5 * 0.536 1 activities that have led to a reduction in the genetic
0 [34]
diversity of the wild populations . The SS popula-
6 * * * tion exhibited the highest H value (0.44) and the
o
lowest F value (1.20), indicating lower heterozy-
1 2 3 4 5 6 is
(c) gote deficiency and greater genetic diversity.
Fig. 4 Shell length (a), wet weight (b), correlation heat- Bivalve populations inhabiting different loca-
map between byssal phenotype and body parameters (c) tions exhibit varying numbers of P , a pattern also
a
[35]
of three wild populations of M. coruscus observed in M. galloprovincialis and other
[33]
1. shell length; 2. wet weight; 3. byssus secretion number; 4. plaque bivalve species, including P. yessoensis , C.
adhesion strength; 5. byssal breaking force; 6. byssal thread diameter. [36] [37]
gigas , and Donax vittatus . Natural selection
The Spearman correlation coefficient is in the upper triangle grids. Posit-
drives the fixation of different alleles across differ-
ive correlations are shown in orange and negative correlations are shown
in blue. “*” means P<0.05. ent environments, each of which is advantageous in
[38]
indicating the polymorphic nature of these loci and one environment but not in another . Therefore,
their suitability for assessing genetic diversity in the the different numbers of P may indicate that three
a
three wild M. coruscus populations. Most loci ana- wild M. coruscus populations have experienced
lyzed in M. coruscus showed significant deviations selective pressures from various environments.

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