Distribution of freshwater amphipods, Jesogammarus jesoensis and Eogammarus kygi, in the Chitosegawa River system, Hokkaido, northern Japan

Kusano, Harumi; Ito, Tomiko

doi:10.3739/rikusui.65.193

Cited by 3 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, no difference was found in the ratios of paired and brooding females to the total mature females between UP and DW (Table 1), i.e., the effect of carcasses on oviposition frequency was not proved in this study. It is known that the reproduction of J. jesoensis occurs throughout the year in Naibetsu River, and the seasonal change in the ratio of brooding females is small (Kusano and Ito 2004). It is not known why the ratio of brooding females at both sites was less in 2000 and 2001 than in 2002 and 2003.…”

Section: Discussionmentioning

confidence: 99%

“…There is little difference between the two sites in terms of stream conditions such as water temperature, velocity, water depth, electrical conductivity, and substrates (Kusano and Ito 2004). The water conditions measured at the time of material collection in April 2000-2003 were 7.3°-12.0°C for water temperature, 7.0-7.1 for pH, and 6.4-7.5 mS m -1 for electrical conductivity; the differences between the two sites were less than 2.6°C, 0.1, 0.4 mS m -1 , respectively.…”

Section: Study Sitementioning

confidence: 97%

“…This happened as a result of increases in both female size and energy investment in one clutch. In another amphipod species, Eogammarus kygi (Derzhavin), living downstream from J. jesoensis in the Chitose River system, it has been reported that the growth of juveniles was mainly facilitated by direct ingestion of salmon flesh (Ito 2003b), and that the distribution was completely limited to the reaches with salmon runs in the Chitose River system (Kusano and Ito 2004). The effect of carcasses on amphipods, therefore, may be different among species, and further studies are needed to know the detailed role of carcasses in amphipod ecology.…”

Section: Role Of Carcasses In Amphipod Ecologymentioning

confidence: 98%

“…In the Chitose River system, adult salmon run from autumn to winter every year, and the carcasses are distributed in the middle reaches of the river and its tributaries (Ito et al 2005). Jesogammarus jesoensis exists upstream from the upper limit of the distribution of the carcasses (Kusano and Ito 2004), and therefore, only a part of the population will encounter carcasses. We considered that the effect of carcasses on the reproduction of J. jesoensis could be examined by comparing two populations, one with and one without access to carcasses.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of salmon carcasses on egg production of a freshwater amphipod, Jesogammarus jesoensis: a field observation

Kusano¹,

Ito²

2005

Limnology

Self Cite

View full text Add to dashboard Cite

The effect of salmon carcasses on egg production of a freshwater amphipod, Jesogammarus jesoensis, was examined by comparing populations with and without a supply of carcasses in Naibetsu River in Hokkaido, northern Japan. The female body length in the population with carcasses became larger in the years when carcasses were abundant, being significantly larger than that in the population without carcasses. No evidence, however, was found that carcasses influenced the ratio of brooding females to mature females. Every year, the clutch size in the population with carcasses was larger than the clutch size without carcasses. Because clutch size showed a significant correlation with female size, the larger clutch size was considered to be a result of the larger female size. In addition, however, comparison of clutch size using analysis of cavariance revealed that clutch size in the population with carcasses was larger than that without carcasses, even for the same body size. Egg size showed no difference between populations and for different years. These results indicate that salmon carcasses influence egg production of J. jesoensis by increasing female body size and by increasing the investment in each clutch per unit of body size.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Study Sitementioning

confidence: 97%

Section: Role Of Carcasses In Amphipod Ecologymentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of salmon carcasses on egg production of a freshwater amphipod, Jesogammarus jesoensis: a field observation

Kusano¹,

Ito²

2005

Limnology

Self Cite

View full text Add to dashboard Cite

show abstract

Ecosystem Functions of a Spring-Fed Tributary in Providing Foraging Habitat and Thermal Refuge for Juvenile Masu Salmon

Sakai

Hoshi

Wakiya

2023

Ichthyology & Herpetology

View full text Add to dashboard Cite

Population dynamics of the introduced crangonyctid amphipod Crangonyx floridanus and native anisogammarid amphipod Jesogammarus jesoensis at the Tate-gawa River in Azumino City, Nagano Prefecture

Tanaka¹,

Nagakubo²,

Tojo³

2010

Japanese Journal of Limnology (Rikusuigaku Zasshi)

View full text Add to dashboard Cite

The crangonyctid amphipod, Crangonyx floridanus Bousfield, originating from North America (Florida), has invaded the freshwater habitats of Japan. This amphipod was first found in Japan in 1989, in the Furutone-numa oxbow lake of the Tone-gawa River which flows along the Ibaraki-Chiba prefectural boundary. Its strong capacity to adapt to broad and variable environmental conditions, and their superior reproductive efficiency have contributed to its rapid dispersion throughout Japan. These alien amphipods have a significantly broader range of habitats than their native counterparts, and can inhabit a wide range of environments, even those with a relatively high water temperature. They also readily inhabit the oligosaprobic waterways originally used by native species. In the present study, we conducted a comparative ecological and population dynamics research between the alien amphipod C. floridanus and the native amphipod Jesogammarus jesoensis, at the Tate-gawa River study site (Azumino, Nagano Prefecture). Although both the alien and native amphipods inhabit the same area, habitat segregation at the microhabitat level was observed (i.e., they tend to utilize different water plant species as their habitats). It was also suggested that some interaction may be occurring in terms of the timing of their reproductive season in order to facilitate their successful cohabitation. No evidence of a particularly strong competitive relationship was observed between the alien and native amphipod species. This is thought to be due to their niche segregation as a result of the significant differences in their body size, and also to the abundant availability of habitats and food (i.e., rich water plants), along with the high water quality of the environment at the Tate-gawa River study site.

show abstract

Distribution of freshwater amphipods, Jesogammarus jesoensis and Eogammarus kygi, in the Chitosegawa River system, Hokkaido, northern Japan

Cited by 3 publications

References 0 publications

Effect of salmon carcasses on egg production of a freshwater amphipod, Jesogammarus jesoensis: a field observation

Effect of salmon carcasses on egg production of a freshwater amphipod, Jesogammarus jesoensis: a field observation

Ecosystem Functions of a Spring-Fed Tributary in Providing Foraging Habitat and Thermal Refuge for Juvenile Masu Salmon

Population dynamics of the introduced crangonyctid amphipod Crangonyx floridanus and native anisogammarid amphipod Jesogammarus jesoensis at the Tate-gawa River in Azumino City, Nagano Prefecture

Contact Info

Product

Resources

About