Masahide Kaeriyama - Academia.edu (original) (raw)
Uploads
Papers by Masahide Kaeriyama
Marine Ecosystems of the …, 2003
Nihon Seitai Gakkaishi, 2005
Zoological Science, Dec 15, 2001
Letters in Applied Microbiology, Mar 1, 2006
To investigate the requirement of outer membrane porins for osmotic adaptation at alkaline pH in ... more To investigate the requirement of outer membrane porins for osmotic adaptation at alkaline pH in Escherichia coli. Escherichia coli mutants deficient in ompC, ompF and both genes were constructed and the growth of these mutants was observed at alkaline pH. The growth rate of the mutant deficient in both ompC and ompF was slower than that of the wild type and mutants deficient in one of these genes under hyperosmotic stress at pHs above 8.0. The decreased rate was recovered when a cloned ompC was introduced to the mutant, but the growth recovery with a cloned ompF was partial. Such growth diminution was not observed at pHs below 8.0. OmpC and OmpF were shown to participate in hyperosmotic adaptation at alkaline pH in E. coli. This study is the first report to demonstrate that OmpC and OmpF are required for hyperosmotic adaptation at pHs above 8.0, but not below 8.0.
Nippon Suisan Gakkaishi, 2000
Bulletin - North Pacific Anadromous Fish Commission, Dec 30, 2016
Verhandlungen, Sep 1, 2001
Bulletin of the Japanese Society of Scientific Fisheries, 1982
Ten precocious males of sockeye salmon (age 1.0, 190-220 mm in fork length) were captured in the ... more Ten precocious males of sockeye salmon (age 1.0, 190-220 mm in fork length) were captured in the Bibi River of the Abira River system along the Pacific coast of Hokkaido, Japan, during July and August 1994. Their origin was a hatchery-reared sockeye salmon stock (84-146 mm in fork length) released in the river in the middle May of the same year. Most of precocious males captured in the river were infected with the marine digenean parasites (Bruchyphallus crenatus and/or Lecithaster gibbosus), indicating their ocean residence. The scale patterns suggested that they rapidly grew in the ocean for at least 2 months. This may be the first report evidencing the seaward migration of yearling precocious sockeye salmon and their temporary residence in the ocean environment.
Life histories of sockeye (Oncorhynchus nerka) and chum salmon (0. ketal show a conditional strat... more Life histories of sockeye (Oncorhynchus nerka) and chum salmon (0. ketal show a conditional strategy which have two tactics of residence and migration. They remain in lakes and rivers if they can obtain sufficient resources such as food and habitat, or migrate seaward when they do not have enough resources to satisfy their energy metabolism. Their migration pattern, controlled by effects of "prior residence" and "precedent migration", may be influenced by trade off between the profitability of resource acquisition and risks such as osmoregulation, energetic demands of swimming, exposure to predators, and mobilization to non-adaptable habitat by water current. The life history strategy and migration pattern of the genus Oncorhynchus reflect an evolution of anadromous fish by which they have acquired anadromy for obtaining food resources in the sea and homing ability for reproduction in freshwater.
Pacific salmon (Oncorhynchus spp.) play an important role as keystone species and as ecosystem se... more Pacific salmon (Oncorhynchus spp.) play an important role as keystone species and as ecosystem services in the North Pacific ecosystem. Our objective is to evaluate the trends in and causes of variation in run size and carrying capacity of Pacific salmon, and to predict their future production dynamics. Salmon catch data indicate that the abundance of Pacific salmon has declined since the end of the twentieth century, despite the healthy condition of stocks. At the beginning of the 21st century, chum (O. keta) and pink salmon (O. gorbuscha) maintained high abundance commensurate with a sharp increase in hatchery-released populations. However, sockeye salmon (O. nerka) have shown a reduction trend since the late 1990s. The abundance of coho (O. kisutch), Chinook (O. tshawytscha), and masu (O. masou) salmon, which spend more than one year in fresh water, has declined sharply since the 1980s due to degraded environmental conditions in freshwater habitats (e.g., habitat loss, urbanization, and river channelization). The significant positive correlation between the carrying capacity (K) of three species (sockeye, chum, and pink salmon), defined as the replacement level of Ricker's recruitment curve, and the Aleutian Low Pressure Index (ALPI) indicate that their carrying capacity is synchronous with long-term trends in climate change. The carrying capacity of the three species is expected to continue the downward trend seen since the 1998/99 regime shift.
Fisheries Oceanography, Jun 9, 2022
This study reviews the evidence for warming climate impacts on ocean migration, growth, and survi... more This study reviews the evidence for warming climate impacts on ocean migration, growth, and survival of southern populations of Pacific salmon (Oncorhynchus spp.), in particular, Japanese chum salmon (O. keta). In this century, productivity of Asian and North American Pacific salmon declined in southern areas but increased in northern areas owing to a warming climate. Japanese chum salmon, mainly hatchery‐produced fish, are roughly divided into two populations: warm‐current populations (WCPs) affected by the Tsushima warm current and cold‐current populations (CCPs) affected by the Oyashio cold current. Their population size and survival rate have declined in Honshu since the late 1990s and in Hokkaido since the late 2000s. The decrease in population size of CCPs is greater than that of WCPs, suggesting that WCPs are relatively adaptable to global warming. A decline in survival rate and insufficient growth of juveniles in coastal habitats due to a shortened duration of coastal stay as a consequence of global warming was identified as the factor affecting the reduced production of Japanese chum salmon. The current situation of chum salmon is approaching that of the Jomon transgression period in Japan (7–5.5 kyr before present). Therefore, it is necessary to establish sustainable conservation management for southern populations of Pacific salmon under a warming climate regime.
Marine Ecosystems of the …, 2003
Nihon Seitai Gakkaishi, 2005
Zoological Science, Dec 15, 2001
Letters in Applied Microbiology, Mar 1, 2006
To investigate the requirement of outer membrane porins for osmotic adaptation at alkaline pH in ... more To investigate the requirement of outer membrane porins for osmotic adaptation at alkaline pH in Escherichia coli. Escherichia coli mutants deficient in ompC, ompF and both genes were constructed and the growth of these mutants was observed at alkaline pH. The growth rate of the mutant deficient in both ompC and ompF was slower than that of the wild type and mutants deficient in one of these genes under hyperosmotic stress at pHs above 8.0. The decreased rate was recovered when a cloned ompC was introduced to the mutant, but the growth recovery with a cloned ompF was partial. Such growth diminution was not observed at pHs below 8.0. OmpC and OmpF were shown to participate in hyperosmotic adaptation at alkaline pH in E. coli. This study is the first report to demonstrate that OmpC and OmpF are required for hyperosmotic adaptation at pHs above 8.0, but not below 8.0.
Nippon Suisan Gakkaishi, 2000
Bulletin - North Pacific Anadromous Fish Commission, Dec 30, 2016
Verhandlungen, Sep 1, 2001
Bulletin of the Japanese Society of Scientific Fisheries, 1982
Ten precocious males of sockeye salmon (age 1.0, 190-220 mm in fork length) were captured in the ... more Ten precocious males of sockeye salmon (age 1.0, 190-220 mm in fork length) were captured in the Bibi River of the Abira River system along the Pacific coast of Hokkaido, Japan, during July and August 1994. Their origin was a hatchery-reared sockeye salmon stock (84-146 mm in fork length) released in the river in the middle May of the same year. Most of precocious males captured in the river were infected with the marine digenean parasites (Bruchyphallus crenatus and/or Lecithaster gibbosus), indicating their ocean residence. The scale patterns suggested that they rapidly grew in the ocean for at least 2 months. This may be the first report evidencing the seaward migration of yearling precocious sockeye salmon and their temporary residence in the ocean environment.
Life histories of sockeye (Oncorhynchus nerka) and chum salmon (0. ketal show a conditional strat... more Life histories of sockeye (Oncorhynchus nerka) and chum salmon (0. ketal show a conditional strategy which have two tactics of residence and migration. They remain in lakes and rivers if they can obtain sufficient resources such as food and habitat, or migrate seaward when they do not have enough resources to satisfy their energy metabolism. Their migration pattern, controlled by effects of "prior residence" and "precedent migration", may be influenced by trade off between the profitability of resource acquisition and risks such as osmoregulation, energetic demands of swimming, exposure to predators, and mobilization to non-adaptable habitat by water current. The life history strategy and migration pattern of the genus Oncorhynchus reflect an evolution of anadromous fish by which they have acquired anadromy for obtaining food resources in the sea and homing ability for reproduction in freshwater.
Pacific salmon (Oncorhynchus spp.) play an important role as keystone species and as ecosystem se... more Pacific salmon (Oncorhynchus spp.) play an important role as keystone species and as ecosystem services in the North Pacific ecosystem. Our objective is to evaluate the trends in and causes of variation in run size and carrying capacity of Pacific salmon, and to predict their future production dynamics. Salmon catch data indicate that the abundance of Pacific salmon has declined since the end of the twentieth century, despite the healthy condition of stocks. At the beginning of the 21st century, chum (O. keta) and pink salmon (O. gorbuscha) maintained high abundance commensurate with a sharp increase in hatchery-released populations. However, sockeye salmon (O. nerka) have shown a reduction trend since the late 1990s. The abundance of coho (O. kisutch), Chinook (O. tshawytscha), and masu (O. masou) salmon, which spend more than one year in fresh water, has declined sharply since the 1980s due to degraded environmental conditions in freshwater habitats (e.g., habitat loss, urbanization, and river channelization). The significant positive correlation between the carrying capacity (K) of three species (sockeye, chum, and pink salmon), defined as the replacement level of Ricker's recruitment curve, and the Aleutian Low Pressure Index (ALPI) indicate that their carrying capacity is synchronous with long-term trends in climate change. The carrying capacity of the three species is expected to continue the downward trend seen since the 1998/99 regime shift.
Fisheries Oceanography, Jun 9, 2022
This study reviews the evidence for warming climate impacts on ocean migration, growth, and survi... more This study reviews the evidence for warming climate impacts on ocean migration, growth, and survival of southern populations of Pacific salmon (Oncorhynchus spp.), in particular, Japanese chum salmon (O. keta). In this century, productivity of Asian and North American Pacific salmon declined in southern areas but increased in northern areas owing to a warming climate. Japanese chum salmon, mainly hatchery‐produced fish, are roughly divided into two populations: warm‐current populations (WCPs) affected by the Tsushima warm current and cold‐current populations (CCPs) affected by the Oyashio cold current. Their population size and survival rate have declined in Honshu since the late 1990s and in Hokkaido since the late 2000s. The decrease in population size of CCPs is greater than that of WCPs, suggesting that WCPs are relatively adaptable to global warming. A decline in survival rate and insufficient growth of juveniles in coastal habitats due to a shortened duration of coastal stay as a consequence of global warming was identified as the factor affecting the reduced production of Japanese chum salmon. The current situation of chum salmon is approaching that of the Jomon transgression period in Japan (7–5.5 kyr before present). Therefore, it is necessary to establish sustainable conservation management for southern populations of Pacific salmon under a warming climate regime.