Vol. 60, 2021
Larval Performance of Amphidromous and Landlocked Atyid Shrimp Species in the Genus Paratya Under Different Temperature and Salinity Conditions
Katsuyuki Hamasaki1,*, Shuji Kondo1, and Shigeki Dan1
of Marine Biosciences, Tokyo University of Marine Science and
Technology, Konan, Minato, Tokyo 108-8477, Japan. *Correspondence:
E-mail: email@example.com (Hamasaki).
E-mail: firstname.lastname@example.org (Kondo); email@example.com (Dan)
Received 4 March 2021 / Accepted 25 May 2021
Communicated by Benny K.K. Chan
shrimps in the family Atyidae exhibit one of two life history traits:
amphidromy, where planktonic larvae develop in the sea; and landlocked,
where lecithotrophic larvae develop in freshwater. Temperature and
salinity are the most important environmental factors that affect the
survival, duration, and growth of decapod crustacean larvae. Larvae of
landlocked shrimps are known to retain the ancestral habit of
amphidromy, i.e., the ability
to develop to the juvenile stage in saline water. Faster development
exhibited by large larvae of landlocked shrimps is considered an
adaptation that allow the larvae to stay in or near parental habitats.
Therefore, information on larval performance under different
temperature and salinity conditions is essential to obtain a better
understanding of population connectivity through marine larval
dispersal in amphidromous shrimps as well as larval adaptation to
freshwater environments in landlocked shrimps. We examined the effects
of temperature and salinity on larval performance of two closely
related atyid shrimps in the genus Paratya: the amphidromous P. compressa and the landlocked P. improvisa.
Larvae were reared under the 25 combinations of five different
temperature (20, 23, 26, 29, and 32°C) and salinity (4.25, 8.5, 17,
25.5, and 34 ppt) levels. In P. compressa,
the rate of larvae that survived into the juvenile stage decreased
linearly with increasing temperature and the larvae adapted to a wider
range of salinity (8.5–34 ppt), though larval mortality increased at
the high salinity (34 ppt) under the higher temperature conditions. In P. improvisa, larval survival rates were higher under wider range of temperature (20–29°C) in brackish water (4.25–17 ppt). Thus, P. compressa
larvae may disperse broadly under the high salinity conditions of the
open sea, but oceanic currents with high temperature and high salinity
conditions may act as a barrier to restrict larval dispersion
northwards from the southern islands. P. improvisa larvae adapted to a wider range of temperature in natural freshwater environments and larval duration was shorter in P. improvisa than in P. compressa
under the wide range of temperature and salinity conditions. Our
results also highlighted the retention strategy by which landlocked P. improvisa larvae stay in or near parental habitats.
Key words: Larval survival, Larval growth, Larval dispersal strategy, Larval retention strategy, Freshwater adaptation.
Citation: Hamasaki K, Kondo S, Dan S. 2021. Larval performance of amphidromous and landlocked Atyid shrimp species in the Genus Paratya under different temperature and salinity conditions. Zool Stud 60:45.
Materials: Fig. S1
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S1 | Table