Hiroki Hata | Ehime University (original) (raw)
Papers by Hiroki Hata
Marine Biology
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Marine Environmental Research, Apr 30, 2013
Tuna-farming is expanding worldwide, necessitating the monitoring/managing of its effects on the ... more Tuna-farming is expanding worldwide, necessitating the monitoring/managing of its effects on the natural environment. In Japan, tuna-farming is conducted on coral reefs that have been damaged by mass-bleaching events and crown-of-thorns starfish (COTS) outbreaks. This study focused on the coral community on an artificial substrate of tuna-farm to reveal the possible effects of tuna-farming on the natural environment. Corals flourished on ropes suspended in the farm in the Amami Islands, southern Japan. These were moored 3 m below the sea-surface in 50-m-deep water. The coral community on the rope was analyzed and compared with those on natural substrata on two adjacent COTS-damaged reefs and with that in a protected reef. Corals were monitored throughout a year. Sixty coral species grew on the ropes, that corresponds to 27.3% of the 220 species known from Amami. The coral community was unique, dominated by massive faviid corals. On the ropes, the water temperature rarely exceeded 30.0 °C and no corals on the rope were severely bleached or covered by sedimentation during the observations. The tuna-farm infrastructure provided corals with a suitable habitat, and species-rich coral communities were established. These coral communities are an important node connecting tuna-farms and the natural environment.
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Journal of Experimental Marine Biology and Ecology, Nov 1, 2002
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BMC biology, Jan 29, 2014
BackgroundLake Tanganyika, an ancient lake in the Great Rift Valley, is famous for the adaptive r... more BackgroundLake Tanganyika, an ancient lake in the Great Rift Valley, is famous for the adaptive radiation of cichlids. Five tribes of the Cichlidae family have acquired herbivory, with five ecomorphs: grazers, browsers, scrapers, biters, and scoopers. Sixteen species of the herbivorous cichlids coexist on a rocky littoral slope in the lake. Seven of them individually defend feeding territories against intruding herbivores to establish algal farms. We collected epiphyton from these territories at various depths and also gathered fish specimens. Algal and cyanobacteria community structures were analysed using the amplicon-metagenomic method.ResultsBased on 454-pyrosequencing of SSU rRNA gene sequences, we identified 300 phototrophic taxa, including 197 cyanobacteria, 57 bacillariophytes, and 31 chlorophytes. Algal farms differed significantly in their composition among cichlid species, even in the same ecomorph, due in part to their habitat-depth segregation. The algal species composi...
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Marine Environmental Research, 2013
Tuna-farming is expanding worldwide, necessitating the monitoring/managing of its effects on the ... more Tuna-farming is expanding worldwide, necessitating the monitoring/managing of its effects on the natural environment. In Japan, tuna-farming is conducted on coral reefs that have been damaged by mass-bleaching events and crown-of-thorns starfish (COTS) outbreaks. This study focused on the coral community on an artificial substrate of tuna-farm to reveal the possible effects of tuna-farming on the natural environment. Corals flourished on ropes suspended in the farm in the Amami Islands, southern Japan. These were moored 3 m below the sea-surface in 50-m-deep water. The coral community on the rope was analyzed and compared with those on natural substrata on two adjacent COTS-damaged reefs and with that in a protected reef. Corals were monitored throughout a year. Sixty coral species grew on the ropes, that corresponds to 27.3% of the 220 species known from Amami. The coral community was unique, dominated by massive faviid corals. On the ropes, the water temperature rarely exceeded 30.0 °C and no corals on the rope were severely bleached or covered by sedimentation during the observations. The tuna-farm infrastructure provided corals with a suitable habitat, and species-rich coral communities were established. These coral communities are an important node connecting tuna-farms and the natural environment.
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Journal of Fish Biology, 2007
ABSTRACT Underwater observations conducted in the shallow waters of the southern part of Lake Tan... more ABSTRACT Underwater observations conducted in the shallow waters of the southern part of Lake Tanganyika showed that a zoobenthos-eating cichlid Neolamprologus mustax preferentially foraged in the permanent territory of an algivorous cichlid Neolamprologus moorii, even though other zoobenthos-eaters were chased out. Benthic invertebrates were much richer within the territory of N. moorii than outside, suggesting that the territory was an attractive feeding ground for zoobenthos-eaters. Stomach contents analysis showed that N. mustax rarely ate fish broods, although other zoobenthos-eaters often did so. It is concluded that the differential tolerance of N. moorii towards zoobenthos-eaters based on their harmfulness to broods benefits harmless N. mustax by allowing its use of the prey-rich territory.
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Journal of Experimental Marine Biology and Ecology, 2002
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Ecological Research, 2011
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Biology Letters, 2006
In cultivation mutualisms, farming animals prepare fields for cultivars, enhance their growth and... more In cultivation mutualisms, farming animals prepare fields for cultivars, enhance their growth and harvest them. For example, in terrestrial ecosystems, plant–herbivore cultivation mutualisms arose between humans and their crops only relatively recently. We discovered an obligate cultivation mutualism between a damselfish and an alga in a coral reef ecosystem. The damselfish, Stegastes nigricans , manages algal farms through territorial defence against the invading grazers and through weeding of unpalatable algae. As a result, the algal farms of S. nigricans are dominated by one species, Polysiphonia sp. We performed an exhaustive survey of algal assemblages inside and outside the territories of five damselfish species around the Ryukyu Islands, Japan, using molecular and morphological characteristics. Polysiphonia sp. 1 grew exclusively inside the farms of S. nigricans , and never elsewhere. Since only Polysiphonia sp. 1 is harvested and consumed by the damselfish as a staple food, ...
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by Ian Donohue, Franziska Schädelin, Kevin Schneider, Jacco van Rijssel, Romulus Abila, Diogo Antunes, Taylor Banda, Auguste Chocha Manda, Peter Akoll, Karoline Fritzsche, Hugo F. Gante, M Genner, Hiroki Hata, Joachim Frommen, Arne Jungwirth, Luc Janssens de Bisthoven, Prince Kaleme, Stephan Koblmüller, Anton Lamboj, Pascal Masilya, Loïc Kéver, Ad Konings, Gaspard Ntakimazi, W. Okello, Lobomir Pialek, Pierre Denis Plisnier, Jelena Rajkov, Joost A M Raeymaekers, Isa Schoen, Pooja Singh, George Turner, Alexandra Tyers, Alexandra A - T Weber, Holger Zimmermann, Ola Svensson, and Maarten Vanhove
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Laterality, 2012
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Zoological science, 2012
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Marine Ecology-progress Series, 2003
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BMC Evolutionary Biology, 2010
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Journal of experimental marine biology and ecology, 2004
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Marine Ecology-progress Series, 2002
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Marine Biology
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Marine Environmental Research, Apr 30, 2013
Tuna-farming is expanding worldwide, necessitating the monitoring/managing of its effects on the ... more Tuna-farming is expanding worldwide, necessitating the monitoring/managing of its effects on the natural environment. In Japan, tuna-farming is conducted on coral reefs that have been damaged by mass-bleaching events and crown-of-thorns starfish (COTS) outbreaks. This study focused on the coral community on an artificial substrate of tuna-farm to reveal the possible effects of tuna-farming on the natural environment. Corals flourished on ropes suspended in the farm in the Amami Islands, southern Japan. These were moored 3 m below the sea-surface in 50-m-deep water. The coral community on the rope was analyzed and compared with those on natural substrata on two adjacent COTS-damaged reefs and with that in a protected reef. Corals were monitored throughout a year. Sixty coral species grew on the ropes, that corresponds to 27.3% of the 220 species known from Amami. The coral community was unique, dominated by massive faviid corals. On the ropes, the water temperature rarely exceeded 30.0 °C and no corals on the rope were severely bleached or covered by sedimentation during the observations. The tuna-farm infrastructure provided corals with a suitable habitat, and species-rich coral communities were established. These coral communities are an important node connecting tuna-farms and the natural environment.
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Journal of Experimental Marine Biology and Ecology, Nov 1, 2002
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BMC biology, Jan 29, 2014
BackgroundLake Tanganyika, an ancient lake in the Great Rift Valley, is famous for the adaptive r... more BackgroundLake Tanganyika, an ancient lake in the Great Rift Valley, is famous for the adaptive radiation of cichlids. Five tribes of the Cichlidae family have acquired herbivory, with five ecomorphs: grazers, browsers, scrapers, biters, and scoopers. Sixteen species of the herbivorous cichlids coexist on a rocky littoral slope in the lake. Seven of them individually defend feeding territories against intruding herbivores to establish algal farms. We collected epiphyton from these territories at various depths and also gathered fish specimens. Algal and cyanobacteria community structures were analysed using the amplicon-metagenomic method.ResultsBased on 454-pyrosequencing of SSU rRNA gene sequences, we identified 300 phototrophic taxa, including 197 cyanobacteria, 57 bacillariophytes, and 31 chlorophytes. Algal farms differed significantly in their composition among cichlid species, even in the same ecomorph, due in part to their habitat-depth segregation. The algal species composi...
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Marine Environmental Research, 2013
Tuna-farming is expanding worldwide, necessitating the monitoring/managing of its effects on the ... more Tuna-farming is expanding worldwide, necessitating the monitoring/managing of its effects on the natural environment. In Japan, tuna-farming is conducted on coral reefs that have been damaged by mass-bleaching events and crown-of-thorns starfish (COTS) outbreaks. This study focused on the coral community on an artificial substrate of tuna-farm to reveal the possible effects of tuna-farming on the natural environment. Corals flourished on ropes suspended in the farm in the Amami Islands, southern Japan. These were moored 3 m below the sea-surface in 50-m-deep water. The coral community on the rope was analyzed and compared with those on natural substrata on two adjacent COTS-damaged reefs and with that in a protected reef. Corals were monitored throughout a year. Sixty coral species grew on the ropes, that corresponds to 27.3% of the 220 species known from Amami. The coral community was unique, dominated by massive faviid corals. On the ropes, the water temperature rarely exceeded 30.0 °C and no corals on the rope were severely bleached or covered by sedimentation during the observations. The tuna-farm infrastructure provided corals with a suitable habitat, and species-rich coral communities were established. These coral communities are an important node connecting tuna-farms and the natural environment.
Bookmarks Related papers MentionsView impact
Journal of Fish Biology, 2007
ABSTRACT Underwater observations conducted in the shallow waters of the southern part of Lake Tan... more ABSTRACT Underwater observations conducted in the shallow waters of the southern part of Lake Tanganyika showed that a zoobenthos-eating cichlid Neolamprologus mustax preferentially foraged in the permanent territory of an algivorous cichlid Neolamprologus moorii, even though other zoobenthos-eaters were chased out. Benthic invertebrates were much richer within the territory of N. moorii than outside, suggesting that the territory was an attractive feeding ground for zoobenthos-eaters. Stomach contents analysis showed that N. mustax rarely ate fish broods, although other zoobenthos-eaters often did so. It is concluded that the differential tolerance of N. moorii towards zoobenthos-eaters based on their harmfulness to broods benefits harmless N. mustax by allowing its use of the prey-rich territory.
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Journal of Experimental Marine Biology and Ecology, 2002
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Ecological Research, 2011
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Biology Letters, 2006
In cultivation mutualisms, farming animals prepare fields for cultivars, enhance their growth and... more In cultivation mutualisms, farming animals prepare fields for cultivars, enhance their growth and harvest them. For example, in terrestrial ecosystems, plant–herbivore cultivation mutualisms arose between humans and their crops only relatively recently. We discovered an obligate cultivation mutualism between a damselfish and an alga in a coral reef ecosystem. The damselfish, Stegastes nigricans , manages algal farms through territorial defence against the invading grazers and through weeding of unpalatable algae. As a result, the algal farms of S. nigricans are dominated by one species, Polysiphonia sp. We performed an exhaustive survey of algal assemblages inside and outside the territories of five damselfish species around the Ryukyu Islands, Japan, using molecular and morphological characteristics. Polysiphonia sp. 1 grew exclusively inside the farms of S. nigricans , and never elsewhere. Since only Polysiphonia sp. 1 is harvested and consumed by the damselfish as a staple food, ...
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
by Ian Donohue, Franziska Schädelin, Kevin Schneider, Jacco van Rijssel, Romulus Abila, Diogo Antunes, Taylor Banda, Auguste Chocha Manda, Peter Akoll, Karoline Fritzsche, Hugo F. Gante, M Genner, Hiroki Hata, Joachim Frommen, Arne Jungwirth, Luc Janssens de Bisthoven, Prince Kaleme, Stephan Koblmüller, Anton Lamboj, Pascal Masilya, Loïc Kéver, Ad Konings, Gaspard Ntakimazi, W. Okello, Lobomir Pialek, Pierre Denis Plisnier, Jelena Rajkov, Joost A M Raeymaekers, Isa Schoen, Pooja Singh, George Turner, Alexandra Tyers, Alexandra A - T Weber, Holger Zimmermann, Ola Svensson, and Maarten Vanhove
Bookmarks Related papers MentionsView impact
Laterality, 2012
Bookmarks Related papers MentionsView impact
Zoological science, 2012
Bookmarks Related papers MentionsView impact
Marine Ecology-progress Series, 2003
Bookmarks Related papers MentionsView impact
BMC Evolutionary Biology, 2010
Bookmarks Related papers MentionsView impact
Journal of experimental marine biology and ecology, 2004
Bookmarks Related papers MentionsView impact
Marine Ecology-progress Series, 2002
Bookmarks Related papers MentionsView impact