Spatiotemporal variations in life-history traits and statolith trace elements of Sepioteuthis lessoniana populations around northern Taiwan

Abstract

The bigfin reef squid Sepioteuthis lessoniana is a neritic species widely distributed in coastal waters of the Indo-Pacific region and is of interest to fisheries for its high commercial value. Squid samples were collected from Keelung (KL) and Penghu (PH), around northern Taiwan from October 2012 to September 2013. A total of 949 squid were examined, and 620 squid were aged using statoliths. The age range of the squid in KL (55–183 days) was similar to that in PH (77–186 days). The squid hatched almost year-round, except in January and December in KL. Two seasonal cohorts were identified: a spring cohort (hatched in March to May) and an autumn cohort (July to October). Concentrations of nine trace elements in statoliths were analysed using solution-based inductively coupled plasma mass spectrometry (ICP-MS). Significant differences in Fe/Ca, Cu/Ca and Sr/Ca were found between the two locations, while significant differences in concentration ratios of Sr/Ca and Ba/Ca were noted between the two seasonal cohorts. Results of a principal component analysis and cluster analysis varied in life-history traits between the two geographic stocks and in elemental concentrations between the two seasonal cohorts. Squid in KL and PH might undertake different migration routes, while seasonal variability in oceanographic conditions was apparent in the two locations.

Seasonal Movement Patterns of the Bigfin Reef Squid Sepioteuthis lessoniana Predicted Using Statolith δ18O Values

“…According to statolith δ 18 O values, most probably the individuals of the spring and summer groups hatched near the coasts of northeastern Taiwan, with an occurrence probability of 1; these findings support empirical evidence that the waters near the coast of northeastern Taiwan are one of main spawning grounds for S. lessoniana (Chen et al, 2015;Ching et al, 2017). The dominant topography in northern Taiwan is that of an eroded coastline with complicated topographical features and structures (Song et al, 1997), forming macroalgae-rich and coral-rich environments for spawning.…”

“…In general, loliginid squids spawn throughout the year and consequently exhibit multicohort formation along with highly diverse dispersion patterns; hence, high levels of genetic diversity are achieved in the populations of these cephalopods (O'dor, 1998). A study reported that the elemental signatures in the entire statolith exhibited less variation between S. lessoniana samples from northern Taiwan and the Penghu Islands for the same season (Ching et al, 2017). This finding suggests a high level of population connectivity in S. lessoniana in Taiwan.…”

“…In the waters off the northern coast of Taiwan, S. lessoniana hatching occurs almost throughout the entire year; hatching peaks in May and August-September (Chen et al, 2015). Hatching can be divided into at least two seasonal groups (spring and autumn) on the basis of hatching date and life history traits of individuals (Ching et al, 2017). This species of squid is important to fisheries because of its high economic value, however, empirical evidence concerning the movement and distribution during the ontogenetic stages is scarce.…”

Environmental Influence on Life-History Traits in Male Squid Uroteuthis Edulis With Alternative Reproductive Tactics

“…Considerable exibility in squid life-history traits (LHTs) has been assumed to be one of the pivotal factors contributing to the increase of squid stocks worldwide, which appears to be a result of the ability of squids to adapt successfully to environmental changes (Pecl et al, 2004;Pecl and Jackson, 2005;Hoving et al, 2013;Doubleday et al, 2016). There is great variability in LHTs in a wide range of squid species (Pierce et al, 2005;Ichii et al, 2009;Ching et al, 2019), which is considered to be a mixture of intrinsic variability and the in uence of environmental factors, especially water temperature and food availability (Vidal et al, 2002;Pecl and Jackson, 2005;Pierce et al, 2008;Yu et al, 2015). Signi cant differences in growth and size-at-maturity have been observed in different geographical and seasonal cohorts for various squid species (Arkhipkin et al, 2000;Jackson and Moltschaniwskyj, 2002;Jackson et al, 2003;Ceriola and Jackson, 2010).…”

Spatiotemporal variations in life-history traits and statolith trace elements of Sepioteuthis lessoniana populations around northern Taiwan – CORRIGENDUM

“…In the original publication of this article (Ching et al, 2017) the author order and affiliations were mistakenly presented. They should appear as below:…”