Seasonal variations in leaf growth of Cymodocea serrulata in subtropical seagrass meadows

Yamada, Hideaki; Nakamoto, Kenta; Kawamura, Tomohiko; Kon, Koetsu; Shimabukuro, Hiromori; Fukuoka, Kouki

doi:10.1007/s12562-018-1183-8

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…Ogden & Ogden 1982, Duarte 1991, Erftemeijer & Herman 1994, Lin & Shao 1998, but for Cymodocea serrulata, our growth ranges were more variable compared to other studies (e.g. Udy & Dennison 1997, Kamal et al 1999, de Boer 2000, Yamada et al 2018.…”

Section: Discussioncontrasting

confidence: 60%

Ecological co-benefits from sea cucumber farming: Holothuria scabra increases growth rate of seagrass

Arnull

Wilson

Brayne

et al. 2021

Aquacult. Environ. Interact.

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Sea cucumber aquaculture is increasing in extent and importance throughout the Indo-Pacific region, supplying a luxury seafood market in Asia. In this context, the grow-out of hatchery-bred juveniles in community-farmed pens is proving to be a viable model, providing increased income security and alternative livelihood options to resource-limited communities. Here, we report a study of the impacts of such sea cucumber farming on the growth of seagrass (a favourable habitat for the animals) at a village-scale aquaculture site in southwest Madagascar. Using experiments, we found that the presence of the hatchery-bred sea cucumber Holothuria scabra (sandfish), at stocking densities of 300 g m-2 (similar to the density used in the farmed pens, but relatively high for natural populations), resulted in a large (~30%), statistically significant increase in the leaf extension rate of the locally dominant seagrass species Thalassia hemprichii. However, the other dominant seagrass species, Cymodocea serrulata, did not significantly change its leaf extension rate in the presence of H. scabra. Since seagrass is a globally important coastal habitat, supporting high biodiversity, carbon sequestration, shoreline stability and nursery grounds for commercial and small-scale fisheries, the positive effect of H. scabra farming on the growth rate of at least one dominant seagrass species implies potential important ecological co-benefits. These co-benefits of H. scabra farming are likely to be relevant across the tropical Indo-Pacific coastlines, where this species is cultured.

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Section: Discussioncontrasting

confidence: 60%

Ecological co-benefits from sea cucumber farming: Holothuria scabra increases growth rate of seagrass

Arnull

Wilson

Brayne

et al. 2021

Aquacult. Environ. Interact.

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“…Nagura Bay (24°39′N 124°13′E) is situated on the western side of Ishigaki Island, Yaeyama Archipelago, southern Japan, ~45 km east from Amitori Bay (Iriomote Island; Figure 1), where a previous dietary study of seagrass fish assemblages was conducted (Nakamura et al ., 2003). Nagura Bay supports large seagrass beds occupied primarily by Cymodocea rotundata , C. serrulate and Thalassia hemprichii , plus other sandy bottom-dwelling species (Yamada et al ., 2018). The beds form an extensive belt (100–500 m width, ~20 km length) along the shoreline of the bay (Tanaka & Kayanne, 2007), being some 300–500 m wide at the study site in the southern part of the bay.…”

Section: Methodsmentioning

confidence: 99%

“…Extensive seagrass beds occurring in Nagura Bay, on the west side of Ishigaki Island, Yaeyama Archipelago, Okinawa Prefecture, Japan (Yamada et al ., 2018), support rich seagrass-associated invertebrates (Nakamoto et al ., 2018), therefore having potential as fish feeding grounds. However, the feeding patterns of fish assemblages are still unclear in the bay, although the trophic structure of seagrass fish assemblages has already been reported from Amitori Bay, Iriomote Island, adjacent to Ishigaki Island (Nakamura et al ., 2003).…”

Section: Introductionmentioning

confidence: 98%

Food habits of fishes in a subtropical seagrass bed in Nagura Bay, Ishigaki Island, southern Japan

et al. 2022

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Recent losses of seagrass beds have resulted in a decrease in seagrass-associated fishes, highlighting the need for the improved management of such habitats and resources. Analyses of feeding patterns of fish associated with seagrass habitats are useful for understanding their habitat dependence, which contributes to achieving their effective conservation. The gut contents of 61 fish species were examined to clarify the food habits of subtropical seagrass fishes in Nagura Bay, Ishigaki Island, southern Japan. A cluster analysis based on dietary overlaps showed that the seagrass fish assemblage comprised six trophic groups (small crustacean, large crustacean, detritus, plant, fish and zooplankton feeders). Small and large crustacean feeders were the most abundant, followed by detritus, plant and fish feeders. Zooplankton feeders were represented by only two species. Ontogenetic changes in food preference were recognized in four species, including Lutjanus fulviflamma, Ostorhinchus ishigakiensis, Gerres oyena and Siganus fuscescens. Small individuals of the four species generally fed on small crustaceans or detritus, subsequently switching to other larger prey items with growth (e.g. crabs, shrimps and seagrass fronds). The most important food items for the assemblage comprised harpacticoid copepods, shrimps, crabs and detritus, representing high cumulative gut volumes for all fishes. Some species showed diets remarkably different from those determined for fishes in other seagrass beds off a nearby neighbouring island, evidence of the food-use patterns of seagrass fishes varying on a small spatial scale. Such dietary flexibility may increase the adaptability of fishes to seagrass beds characterized by significant variations in available food resources.

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Global database of key seagrass structure, biomass and production variables

Strydom,

Webster,

McCallum

et al. 2021

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Seasonal variations in leaf growth of Cymodocea serrulata in subtropical seagrass meadows

Cited by 3 publications

References 25 publications

Ecological co-benefits from sea cucumber farming: Holothuria scabra increases growth rate of seagrass

Ecological co-benefits from sea cucumber farming: Holothuria scabra increases growth rate of seagrass

Food habits of fishes in a subtropical seagrass bed in Nagura Bay, Ishigaki Island, southern Japan

Global database of key seagrass structure, biomass and production variables

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