Nursery habitat of three species of juvenile Asian horseshoe crabs in Teritip Beach, East Kalimantan, Indonesia: Characterization and implication

Meilana, Lusita; Hakim, Agus Alim; Fang, Qinhua

doi:10.1016/j.gecco.2021.e01453

Cited by 12 publications

(12 citation statements)

References 33 publications

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“…In this experiment, 1st instar larvae were chosen because the juveniles are more sensitive to environmental changes than adults ( Small et al, 2016 ), on the other hand, 1st instar larvae mainly inhabit the intertidal area where OA frequently occurs ( Meilana et al, 2021 ) while large size horseshoe crabs live in the deep ocean (20 ∼ 60 m deep). In addition, materials of other life history stages are not easily obtained compared with the 1st instar larvae.…”

Section: Discussionmentioning

confidence: 99%

“…After 2 weeks of acclimation, two levels of seawater pH were designed. Three glass tanks of juvenile horseshoe crabs were randomly selected as the acidification treatment [pH 7.3, Meilana et al (2021) found that estuarine waters inundated the intertidal area with pH fluctuation of 6.99–8.62, and pH 7.3 is the extreme acidified pH expected to be reached by 2300 in the ocean ( Caldeira and Wickett, 2005 )], and the other three tanks of juvenile horseshoe crabs were set as the control group (pH 8.1 is the normal environmental pH and the normal artificial seawater is also pH 8.1 in the laboratory). Pure CO 2 gas was filled into the seawater to achieve real-time pH control and monitoring via a p CO 2 /pH system equipped with a pH meter (WTW 3310) and pH electrode (SenTix 41) designed by Loligo Systems Inc. ( Shang et al, 2018 ; Wu et al, 2018 ).…”

Section: Methodsmentioning

confidence: 99%

“…During the reproductive season, female adult horseshoe crabs lay their eggs in the sands of the high tide zone. Juvenile horseshoe crabs mostly live in the intertidal mudflats, with a pH range of 6.99–8.62 (measured at estuarine waters inundated the intertidal area) in the habitats, where pH fluctuation or OA frequently occurs ( Meilana et al, 2021 ). Chen et al (2004) referred horseshoe crabs as a good indicator species for reflecting the general health of the coastal habitat.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Ocean Acidification on Molting, Oxidative Stress, and Gut Microbiota in Juvenile Horseshoe Crab Tachypleus tridentatus

Liu

Xiong

et al. 2022

Front. Physiol.

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Anthropogenic elevation of atmospheric carbon dioxide (CO2) drives global-scale ocean acidification (OA), which has aroused widespread concern for marine ecosystem health. The tri-spine horseshoe crab (HSC) Tachypleus tridentatus has been facing the threat of population depletion for decades, and the effects of OA on the physiology and microbiology of its early life stage are unclear. In this study, the 1st instar HSC larvae were exposed to acidified seawater (pH 7.3, pH 8.1 as control) for 28 days to determine the effects of OA on their growth, molting, oxidative stress, and gut microbiota. Results showed that there were no significant differences in growth index and molting rate between OA group and control group, but the chitinase activity, β-NAGase activity, and ecdysone content in OA group were significantly lower than those of the control group. Compared to the control group, reactive oxygen species (ROS) and malondialdehyde (MDA) contents in OA group were significantly increased at the end of the experiment. Superoxide dismutase (SOD), catalase (CAT), and alkaline phosphatase (AKP) activities increased first and then decreased, glutathione peroxidase (GPX) decreased first and then increased, and GST activity changed little during the experiment. According to the result of 16S rRNA sequencing of gut microbiota, microbial-mediated functions predicted by PICRUSt showed that “Hematopoietic cell lineage,” “Endocytosis,” “Staphylococcus aureus infection,” and “Shigellosis” pathways significantly increased in OA group. The above results indicate that OA had no significant effect on growth index and molting rate but interfered with the activity of chitinolytic enzymes and ecdysone expression of juvenile horseshoe crabs, and caused oxidative stress. In addition, OA had adverse effects on the immune defense function and intestinal health. The present study reveals the potential threat of OA to T. tridentatus population and lays a foundation for the further study of the physiological adaptation mechanism of juvenile horseshoe crabs to environmental change.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Ocean Acidification on Molting, Oxidative Stress, and Gut Microbiota in Juvenile Horseshoe Crab Tachypleus tridentatus

Liu

Xiong

et al. 2022

Front. Physiol.

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“…The sawdust waste accumulates in the mouth of the river, which is a spawning route for longtail shad fish. Thus, it is consumed by fish [52]. This condition is presumably because the use of natural forest wood, threatening the preservation of natural resources and the environment, has now begun to be regulated and limited by the government so that many sawmills are no longer operating.…”

Section: Longtail Shad Fish Gut Content Analysismentioning

confidence: 99%

Mangroves and the Sustainability of Longtail Shad Fish (Tenualosa macroura) in Riau Province Water, Indonesia

Seygita¹,

Sulistiono²,

Kusmana³

et al. 2022

Int. J. Adv. Sci. Eng. Inf. Technol.

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Mangroves are crucial to fisheries as nurseries; they can be used as spawning and feeding grounds for fish, including Longtail Shad fish (Tenualosa macroura). The objective of the study was to analyze the mangrove vegetation used as Longtail Shad fish spawning ground. It was carried out from January to May 2021, using a checkered line method with six sampling stations. Each station was placed in three transects with three plots for each transect. Density, relative density, frequency, relative frequency, dominance, relative dominance, and importance value index were included in the vegetation analysis. There were 13 true mangrove types and 1 mangrove associate type at the study locations. The highest mangrove density was found at Station 3 with 3300.48 Ind/Ha, categorized as good. The highest mangrove coverage was found at Station 2, with an exceptionally dense category (76.34%). The regression analysis revealed a substantial relationship between density and mangrove and the water salinity at a 0.002 significance value (<0.05). Based on the gut content analysis in establishing the fish's eating habits, the type of food consumed by the Longtail Shad fish was mostly mangrove litter, representing 44.66% of the total stomach contents. The result of the study clearly shows that mangroves are crucial for Longtail Shad fish. A good mangrove ecosystem will provide good water quality for the migration process of longtail shad fish and produce mangrove litter as fish food. Mangrove ecosystem management can support the management of Terubuk fisheries.

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“…While the spawning biology of horseshoe crabs may share common characteristics, the existing information for Asian species is limited and mostly descriptive. Similar to their Atlantic counterpart, the distribution of newly settled and early-stage juvenile T. tridentatus and C. rotundicauda populations is non-random and has a high tendency to stay close to mangrove, seagrass and other structured habitats ( Kwan et al, 2016 ; Kaiser & Schoppe, 2018 ; Xie et al, 2020 ; Meilana, Hakim & Fang, 2021 ). Recent spawning habitat surveys in the northern Beibu Gulf, following the last report in 1984 in China ( Cai, Lin & Huang, 1984 ), demonstrated that the identified nesting beaches were adjacent to nursery habitats for juveniles ( Kwan et al, 2022 ).…”

Section: Introductionmentioning

confidence: 98%

Chemically mediated rheotaxis of endangered tri-spine horseshoe crab: potential dispersing mechanism to vegetated nursery habitats along the coast

Kwan

Yang

Wang

et al. 2022

PeerJ

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Background An enhanced understanding of larval ecology is fundamental to improve the management of locally depleted horseshoe crab populations in Asia. Recent studies in the northern Beibu Gulf, China demonstrated that nesting sites of Asian horseshoe crabs are typically close to their nursery beaches with high-density juveniles distributed around mangrove, seagrass and other structured habitats. Methods A laboratory Y-maze chamber was used to test whether the dispersal of early-stage juvenile tri-spine horseshoe crab Tachypleus tridentatus is facilitated by chemical cues to approach suitable nursery habitats. The juvenile orientation to either side of the chamber containing controlled seawater or another with various vegetation cues, as well as their movement time, the largest distance and displacement were recorded. Results The juveniles preferred to orient toward seagrass Halophila beccarii cues when the concentration reached 0.5 g l−1, but ceased at 2 g l−1. The results can be interpreted as a shelter-seeking process to get closer to the preferred settlement habitats. However, the juveniles exhibited avoidance behaviors in the presence of mangrove Avicennia marina and invasive saltmarsh cordgrass Spartina alterniflora at 2 g l−1. The juveniles also spent less time moving in the presence of the A. marina cue, as well as reduced displacement in water containing the S. alterniflora cue at 1 and 2 g l−1. These results may explain the absence of juvenile T. tridentatus within densely vegetated areas, which have generally higher organic matter and hydrogen sulfide. Conclusion Early-stage juvenile T. tridentatus are capable of detecting and responding to habitat chemical cues, which can help guide them to high-quality settlement habitats. Preserving and restoring seagrass beds in the intertidal areas should be prioritized when formulating habitat conservation and management initiatives for the declining horseshoe crab populations.

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Nursery habitat of three species of juvenile Asian horseshoe crabs in Teritip Beach, East Kalimantan, Indonesia: Characterization and implication

Cited by 12 publications

References 33 publications

Effects of Ocean Acidification on Molting, Oxidative Stress, and Gut Microbiota in Juvenile Horseshoe Crab Tachypleus tridentatus

Effects of Ocean Acidification on Molting, Oxidative Stress, and Gut Microbiota in Juvenile Horseshoe Crab Tachypleus tridentatus

Mangroves and the Sustainability of Longtail Shad Fish (Tenualosa macroura) in Riau Province Water, Indonesia

Chemically mediated rheotaxis of endangered tri-spine horseshoe crab: potential dispersing mechanism to vegetated nursery habitats along the coast

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