One-year Comparison of Stomach Contents among Demersal Fishes off the Coast of Usujiri, Hokkaido.

Sawamura, Masayuki

doi:10.5179/benthos.54.14

Cited by 2 publications

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“…High predation risk for swimming amphipods with low self-defense abilities, such as P. rostrata , has been reported in several studies ( Sudo & Azeta, 1992 ; Beare & Moore, 1998 ). In fact, gammarid amphipods are a major source of prey for blennoid fish in the eelgrass beds of Northern Japan ( Watanabe et al, 1996 ; Sawamura, 1999 ; Yamada et al, 2010 ). Therefore, the complex micro-habitat created by macroalgae allows them to escape these predators.…”

Section: Discussionmentioning

confidence: 99%

Influence of different types of sessile epibionts on the community structure of mobile invertebrates in an eelgrass bed

Momota

Nakaoka

2017

PeerJ

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Eelgrass (Zostera marina) beds are known to have high ecological and economical values within coastal ecosystems of the temperate northern hemisphere although their biodiversity and functions varied greatly from sites to sites. The variation in the biomass, abundance and diversity of mobile invertebrates in eelgrass beds has been examined in relation to various abiotic and biotic factors, such as water temperature, salinity, eelgrass biomass and epiphytic microalgae presence. However, the importance of sessile epibionts, such as macroalgae and calcific spirorbid polychaetes attached to eelgrass blades, has not been the focus of previous studies. In the present study, we examined the effects of three different sessile epibionts, namely, branched red algae, filamentous green algae, and calcific spirorbid polychaetes, on the biomass and diversity of mobile invertebrates in the eelgrass beds of Akkeshi in northeastern Japan. The relationships between seven abiotic and biotic variables including three types of epibionts, and biomass of 11 dominant mobile invertebrate species as well as three community-level variables (the total biomass of mobile invertebrates, species richness and the Shannon-Wiener species diversity index) were analyzed using a linear mixed model. Our results show that branched red algae are correlated with Pontogeneia rostrata, Lacuna spp., Nereis sp., Syllis sp. and the total biomass of mobile invertebrates, filamentous green algae with P. rostrata, Ansola angustata and the species diversity of mobile invertebrates, and spirorbid polychaetes with A. angustata, Lacuna spp., Siphonacmea oblongata, Syllis sp., the species richness and diversity of mobile invertebrates. The effect size of the epibionts was similar or even higher than that of abiotic and eelgrass factors on the total biomass of mobile invertebrates, species richness, species diversity and most of dominant invertebrate populations across the taxonomic groups. Consequently, epibiotic macroalgae and spirorbid polychaetes can be good predictors of the variation in the total biomass, species richness and species diversity of mobile invertebrates and the biomass of major dominant species, especially for species that have a relatively high dependency on eelgrass blades. These results suggest that the different functional groups of sessile epibionts have significant roles in determining the biomass and diversity of mobile invertebrates in eelgrass beds.

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Section: Discussionmentioning

confidence: 99%

Influence of different types of sessile epibionts on the community structure of mobile invertebrates in an eelgrass bed

Momota

Nakaoka

2017

PeerJ

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“…By species, P. minutus , P. ortmanni and P. langinosus were found in the tyres in the highest numbers in January, March and January, respectively, while the lowest number of captures for any species was recorded in June. Because the main local hermit crab predators, fat greenling Hexagrammos otakii [ 15 ] and Schlegel's black rockfish Sebastes schlegelii , overwinter in deeper waters, reduced predation risk in winter may increase hermit crab activity and contribute to their higher numbers being found in tyres. Alternatively, decreased catch from spring to early summer may be related to rapid spring seaweed growth on and around tyres, which hermit crabs within tyres might exploit to escape, leading to underestimates of their numbers invading tyres ( figure 2 ).…”

Section: Resultsmentioning

confidence: 99%

Marine-dumped waste tyres cause the ghost fishing of hermit crabs

Sogabe

Takatsuji

2021

R. Soc. open sci.

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Poorly managed waste tyres pose serious environmental and health risks, ranging from air pollution caused by fire, leaching of heavy metals and outbreaks of mosquitos, to destruction of vegetation and coral reefs. We report a previously unrecognized ecological risk to marine organisms from waste tyres. Over 1 year, we made monthly counts of hermit crabs ( n = 1278) invading and/or being trapped within six tyres anchored to the seabed at 8 m depth in Mutsu Bay, Japan. A complementary aquarium experiment in which hermit crabs were released into a tyre confirmed that they could not escape. We report marine-dumped waste tyres to ghost fish in a manner analogous to discarded fishing gear. Because hermit crabs play important roles in coastal food webs as both prey and scavengers, declines in their numbers as a consequence of this ghost fishing might affect coastal ecosystems.

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One-year Comparison of Stomach Contents among Demersal Fishes off the Coast of Usujiri, Hokkaido.

Cited by 2 publications

References 0 publications

Influence of different types of sessile epibionts on the community structure of mobile invertebrates in an eelgrass bed

Influence of different types of sessile epibionts on the community structure of mobile invertebrates in an eelgrass bed

Marine-dumped waste tyres cause the ghost fishing of hermit crabs

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