Seasonal dynamics of fishes in tidepools on tidal mudflats in the Tama River estuary, central Honshu, Japan

Okazaki, Daisuke; Yokoo, Toshihiro; Kanou, Kouki; Kohno, Hiroshi

doi:10.1007/s10228-011-0242-2

Cited by 13 publications

(6 citation statements)

References 13 publications

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“…We detected minimal significant seasonal variations in species composition, abundance, biomass and species number for intertidal fishes and their trophic functional groups in subtropical and tropical Taiwan. This is in contrast to many studies on coral reef fishes which have indicated seasonal variations in movement, composition and recruitment of fishes due to seasonal fluctuations in environmental parameters or food availability (Abesamis and Russ, 2010;Bijoux et al, 2013;Okazaki et al, 2012). With respect to intertidal fishes however, overall our results are in line with other studies which show stable species diversity in subtropical and tropical tidepool fish assemblages across seasons (Castellanos-Galindo et al, 2005;Murase, 2013).…”

Section: Trophic Functional Groupssupporting

confidence: 81%

Regional and Seasonal Differences in Species Composition and Trophic Groups for Tidepool Fishes of a Western Pacific Island – Taiwan

Wen

Chen²,

Shao

2018

Indo. J. Mar. Sci.

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Spatial and temporal variations in the species composition of assemblages are common in many marine organisms, including fishes. Variations in the fish species composition of subtidal coral reefs have been well documented, however much less is known about such differences for intertidal fish assemblages. This is surprising, given that intertidal fishes are more vulnerable to terrestrial human disturbances. It is critical to evaluate the ecology and biology of intertidal fishes before they are severely impacted by coastal development, especially in developing countries such as those in the tropical western Pacific region where coastal development is rapidly increasing. In this study, we investigated the species composition, abundance, biomass and species number (richness) for intertidal fish assemblages in subtropical (northern) and tropical (southern) Taiwan across four seasons by collecting fishes from tidepools using clove oil. We also examined the gut contents of collected fishes to identify their trophic functional groups in order to investigate regional and seasonal variations for different trophic groups. We found significant differences in the species composition of tidepool fish assemblages between subtropical and tropical Taiwan. Bathygobius fuscus, Abudefduf vaigiensis and Istiblennius dussumieri were dominant species in subtropical Taiwan, whereas Bathygobius coalitus, Abudefduf septemfasciatus and Istiblennius lineatus were dominant in tropical Taiwan. Other species such as Bathygobius cocosensis, Abudefduf sordidus and Istiblennius edentulus were common in both regions. For trophic groups, omnivores and detritivores had or showed trends towards higher species numbers and abundances in the subtropical region, whereas herbivores, planktivores and general carnivores had or showed trends towards higher species numbers and biomass in the tropical region. Overall, many intertidal fish species and trophic groups showed differences in abundance, biomass and species number between subtropical and tropical Taiwan. Further studies on large scale geographical gradients in trophic groups and species compositions in the Indo-west Pacific region are encouraged to assist with ecosystem monitoring and assessment. Keywords: Intertidal fishes, spatio-temporal pattern, feeding guild, diet

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Section: Trophic Functional Groupssupporting

confidence: 81%

Regional and Seasonal Differences in Species Composition and Trophic Groups for Tidepool Fishes of a Western Pacific Island – Taiwan

Wen

Chen²,

Shao

2018

Indo. J. Mar. Sci.

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“…The order Gobiiformes is one of the most diverse fish taxa that includes at least 2310 species belonging to 324 genera found globally in various habitats ranging from freshwater to deep sea (Patzner et al 2011;Nelson et al 2016;Parenti 2021). In the western Pacific Ocean, tidal mudflats are dominated by gobies throughout the climate divisions including northern Australia (Chargulaf et al 2011), temperate Japan (Okazaki et al 2012), and subtropical Japan (Kunishima and Tachihara 2020). The genus Acentrogobius Bleeker, 1874 is one of the typical taxa found on tidal mudflats within or close to mangroves of the western Pacific Ocean (Allen 2015), however, its diversity, distribution, microhabitat, life history, and phylogeny are yet to be well understood.…”

Section: Introductionmentioning

confidence: 99%

First Records of an Estuarine Goby <i>Acentrogobius ocyurus</i> (Gobiiformes: Gobiidae) from Japan and the Sulu Sea in the Philippines

et al. 2022

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Twenty specimens of Acentrogobius ocyurus (Jordan and Seale, 1907) were collected in Manko, Okinawa-jima Island, Japan and Sulu Sea side of Puerto Princesa City, Palawan Island, Philippines. As the species had previously been reported from the South China Sea, Andaman Sea, and northern Australian waters, these specimens from Okinawa and Palawan represent the first records of the species from Japan and the Sulu Sea. Acentrogobius ocyurus was found on muddy substrata at the lowest tidal zone of the mudflat and was often found in burrows of mangrove pistol shrimp, Alpheus richardsoni Yaldwyn, 1971. Morphological traits suggested that A. ocyurus is closely related to A. globiceps (Hora, 1923), A. kranjiensis (Herre, 1940, and Acentrogobius sp. ("Suzume-haze" in Japanese name), with several homologous features including, the transverse pattern of the sensory papillae on the cheek, caudal fin pointed in middle, a black stripe behind the eye along the anterior oculoscapular canal, bright blue spots laterally on the body, and an oblique yellow stripe across the upper part of the caudal fin.

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“…Four species of this genus, A. flavimanus, A. lactipes, A. hasta and A. insularis, have been recorded in Japan (Akihito et al, 2013). Acanthogobius flavimanus and A. lactipes are widely distributed and one of the most common gobies found in the estuaries of mainland Japan (Takizawa, 1994;Zama, 1999;Kanou et al, 2000;Okazaki et al, 2012). Conversely, A. insularis is an endemic species that is distributed only in the Amami-oshima and Okinawa-jima Islands of the Ryukyu Archipelago.…”

Section: Introductionmentioning

confidence: 99%

“…Acanthogobius flavimanus and A . lactipes are widely distributed and one of the most common gobies found in the estuaries of mainland Japan (Takizawa, 1994; Zama, 1999; Kanou et al , 2000; Okazaki et al , 2012). Conversely, A .…”

Section: Introductionmentioning

confidence: 99%

Life history and instream distribution of the endangered estuarine goby Acanthogobius insularis from Okinawa-jima Island, Japan

et al. 2018

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The genus Acanthogobius of gobiioid fish has been reported for six species from East Asia, and inhabits estuarine and coastal waters. Within this genus, Acanthogobius insularis is an endangered and endemic goby in the Amami-oshima and Okinawa-jima Islands, southern Japan, and its range is restricted to the lowermost course of a few river basins. Basic knowledge on this species is scarce in spite of its vulnerable conservation status. The purpose of this study was to elucidate the life history of A. insularis. Monthly sampling was conducted at five stations in the Taiho River, Okinawa-jima Island, from November 2014 to November 2015. Monthly standard length (SL) distributions were unimodal except in April during the recruiting period, suggesting that A. insularis is an annual species. Analysis of the gonadosomatic index and histological observations of the ovaries revealed that this species spawns from January to May. The beginning of the spawning season seems to be related to a decline in water temperature in December. Growth rates appeared to be lower from April to December and higher in winter months. From monthly collections, A. insularis was found to move upstream with growth, and gather at spawning grounds during the reproductive season. Acanthogobius insularis might be threatened by increasing water temperature due to climate change, since low water temperatures appear to be important for their reproduction and growth. Moreover, habitat diversity, from tidal flats for recruiting grounds to upstream sites with cobbles for spawning, is needed to complete their life cycle, and should be conserved.

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Seasonal dynamics of fishes in tidepools on tidal mudflats in the Tama River estuary, central Honshu, Japan

Cited by 13 publications

References 13 publications

Regional and Seasonal Differences in Species Composition and Trophic Groups for Tidepool Fishes of a Western Pacific Island – Taiwan

Regional and Seasonal Differences in Species Composition and Trophic Groups for Tidepool Fishes of a Western Pacific Island – Taiwan

First Records of an Estuarine Goby <i>Acentrogobius ocyurus</i> (Gobiiformes: Gobiidae) from Japan and the Sulu Sea in the Philippines

Life history and instream distribution of the endangered estuarine goby Acanthogobius insularis from Okinawa-jima Island, Japan

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