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Paul, Mithun; Hajısamae, Sukree; Pradit, Siriporn; Perngmark, Permsak; Islam, Rashedul

doi:10.4194/1303-2712-v18_2_07

Cited by 5 publications

(5 citation statements)

References 28 publications

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“…Studies on trophic relationships have shown that many species, including cephalopods change feeding habits with increasing size or during maturation to maximize energy intake, enhance growth rate and minimize the risk of predation [55][56][57][58][59][60] . In the present study, however, the female D. gigas appear to prey on similar prey items before and after maturation because no significant differences were found in the relative abundance of each fatty acid among maturity stages for the ovary, mantle muscle (except 20:5n3) and digestive gland (Supplementary Table 5).…”

Section: Discussionmentioning

confidence: 99%

The breeding strategy of female jumbo squid Dosidicus gigas: energy acquisition and allocation

Chen

Han

Zhu

et al. 2020

Sci Rep

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Reproductive investment generally involves a trade-off between somatic growth and energy allocation for reproduction. Previous studies have inferred that jumbo squid Dosidicus gigas support growth during maturation through continuous feeding (an "income" source). However, our recent work suggests possible remobilization of soma during maturation (a "capital" source). We used fatty acids as biochemical indicators to investigate energy acquisition and allocation to reproduction for female D. gigas. We compared the fatty acid profiles of the ovary to those of the mantle muscle (slow turnover rate tissue, representing an energy reserve) and the digestive gland (fast turnover rate organ, reflecting recent consumption). For each tissue, the overall fatty acids among maturity stages overlapped and were similar. The changes with maturation in fatty acid composition in the ovary consistently resembled those of the digestive gland, with the similarity of fatty acids in the mantle muscle and the ovary increasing during maturation, indicating some energy reserves were utilized. Additionally, squid maintained body condition during maturation regardless of increasing investment in reproduction and a decline in feeding intensity. Cumulatively, D. gigas adopt a mixed income-capital breeding strategy in that energy for reproduction is mainly derived from direct food intake, but there is limited somatic reserve remobilization. Life-history theory predicts that individuals should trade-off energy allocation between reproduction and somatic growth or even survival to maximize lifetime reproductive success 1. Squids are characterized by short lifespan, fast growth and considerable flexibility in reproductive characteristics 2,3. Although reproduction is typically semelparous, some species spawn multiple times and others continuously 2 , and reproductive behavior relates to how energy is allocated to reproduction during maturation 4-7. For example, the deep-sea squid Onykia ingens reduces somatic growth by utilizing mantle muscle as an energy source to fuel reproduction, which then results in ovarian development for a terminal spawning event 6. In contrast, the purpleback squid Sthenoteuthis oualaniensis apparently supports reproduction using energy acquired directly from food intake, leading to multiple spawning events and continuous growth before death 4. The former is referred to as a capital breeder, and the latter as an income breeder 8. Since how energy is allocated during life is central to life-history theory 1 , an optimal trade-off between investment in reproduction and somatic growth has been found to maximize reproductive success, and ultimately determine population size and stability over time 9-11. The jumbo squid, Dosidicus gigas is one of the most abundant nektonic squid in the eastern Pacific 12 , as well as the target species of major cephalopod fisheries 13. It plays an important role in pelagic ecosystems locally 14 , not only because it preys on a wide spectrum of organisms during ontogenesis, but also because it ...

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Section: Discussionmentioning

confidence: 99%

The breeding strategy of female jumbo squid Dosidicus gigas: energy acquisition and allocation

Chen

Han

Zhu

et al. 2020

Sci Rep

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“…Unfortunately, most of the literature on trophic interactions, especially in the Mediterranean, usually focuses on the diet comparison of just two or three species (Valls et al 2011(Valls et al , 2017Barría et al 2015Barría et al , 2018. More complex studies are limited to a few papers, published in recent decades and focusing on the main predator groups, like bony fishes (Cabral et al 2002;Valls et al 2014b;Karachle 2017;Park et al 2017;Paul et al 2018), elasmobranchs (Orlov 1998;Valls et al 2011; Barría et al 2015Barría et al , 2018Kousteni et al 2018), cetaceans (Liu et al 2015) and cephalopods (Cherel et al 2009), while studies on betweentaxa interactions are even fewer (Valls et al 2014a(Valls et al , 2017. Concentration on large predator groups is driven by the predators roles in the food chain, i.e.…”

Section: Introductionmentioning

confidence: 99%

Resource partitioning among sympatric elasmobranchs in the central-western Mediterranean continental shelf

et al. 2019

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“…Islam et al [26] also reported that U. chinensis and U. duvaucelii in the southwest of the Gulf of Thailand of different size-classes had high overlap in their food items and minimal dietary shift with ontogeny. Preying on the common prey items with increasing size may be an optimal foraging strategy for squid to maximize energy intake, enhance their growth rate and minimize predation risk [80,81]. We also found non-significant effects of sampling station on the fatty acid composition for either species and among the four squids considered simultaneously.…”

Section: Plos Onementioning

confidence: 64%

“…It is known that overlap in dietary resources between sympatric species may lead to spatial segregation, which appears to be the essential for coexistence [2,73,81]. The four squids exhibit the characteristics of demersal predators, evidenced by the non-significant differences and high levels in the relative content of 16:0, 20:5n3 and 20:4n6, which are indicators for demersal habitat [76,78].…”

Section: Plos Onementioning

confidence: 99%

Fatty acid comparison of four sympatric loliginid squids in the northern South China Sea: Indication for their similar feeding strategy

et al. 2020

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Feeding strategies of sympatric squid species help to understand their role in marine ecosystems. Four loliginid squids, Uroteuthis duvaucelii, Uroteuthis edulis, Uroteuthis chinensis, and Loliolus uyii are the major cephalopod species in the coastal waters of the northern South China Sea, where they occur together. We investigated their feeding strategies in terms of foraging behavior and habitat use by comparing fatty acid profiles and spatial distributions. There were no significant differences in the proportions of saturated or polyunsaturated fatty acids among species. Similar findings were obtained for most individual fatty acids that made up of an average of more than 84% of total fatty acid content for each species. Substantial overlap and high similarity in the fatty acid composition were observed. However, there were no significant effects of individual size or sampling station on the fatty acid compositions. The spatial overlap analysis demonstrated that there was clear spatial segregation and habitat use among the species. Cumulatively, our results suggest that the four squids are opportunistic carnivores, unselectively foraging on similar prey items, while spatial segregation is likely a major mechanism leading to their coexistence in the northern South China Sea.

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Cited by 5 publications

References 28 publications

The breeding strategy of female jumbo squid Dosidicus gigas: energy acquisition and allocation

The breeding strategy of female jumbo squid Dosidicus gigas: energy acquisition and allocation

Resource partitioning among sympatric elasmobranchs in the central-western Mediterranean continental shelf

Fatty acid comparison of four sympatric loliginid squids in the northern South China Sea: Indication for their similar feeding strategy

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