Replacement of White-spotted Charr Salvelinus leucomaenis by Brown Trout Salmo trutta in a Branch of the Chitose River, Hokkaido.

Takami, Taro; Yoshihara, Takuji; Miyakoshi, Yasuyuki; Kuwabara, Ren

doi:10.2331/suisan.68.24

Cited by 38 publications

(30 citation statements)

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“…Therefore, white-spotted charr may also shift their habitat or be relegated to unsuitable positions by introduced brown trout or rainbow trout, while masu salmon may have such negative impact from introduced brown trout stronger than introduced rainbow trout. In Hokkaido, the replacements of native salmonids to introduced salmonids were reported (Takami et al, 2002;Morita et al, 2003), although the critical evidence of the exclusion has not been confirmed yet. However, our results suggest that white-spotted charr may be excluded by introduced brown trout and rainbow trout and masu salmon may be excluded by introduced brown trout.…”

Section: Discussionmentioning

confidence: 90%

Comparison of competitive ability between native and introduced salmonids: evidence from pairwise contests

et al. 2004

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Brown trout, Salmo trutta, and rainbow trout, Oncorhynchus mykiss, have been introduced to freshwaters in Hokkaido, Japan. Today, it is recognized that these introduced salmonids have negative impacts on native salmonids such as white-spotted charr, Salvelinus leucomaenis, and masu salmon, O. masou. In particular, interspecific competition may be an important mechanism that could contribute to the exclusion for native salmonids. In this study, experimental pairwise contests were conducted to compare interference competitive ability between native and introduced salmonids. We demonstrated that brown trout were competitively superior to white-spotted charr and masu salmon whereas rainbow trout were superior to white-spotted charr. We suggest that introduced brown trout negatively impact both white-spotted charr and masu salmon, and introduced rainbow trout negatively impact white-spotted charr.

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Section: Discussionmentioning

confidence: 90%

Comparison of competitive ability between native and introduced salmonids: evidence from pairwise contests

et al. 2004

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“…In order to conserve the genetic diversity of the white-spotted charr in the Lake Biwa water system, it is necessary to ensure that hatchery-reared charr are not stocked in the reaches where hatchery-reared charr have not previously been stocked. Furthermore, artificial barriers sometimes prevent populations of native fishes from dispersing and thereby intermixing with non-native fishes (Nakamura 2001;Takami et al 2002). Dams may also protect the local populations from encroachment by hatchery-reared charr, and so fish-ways should not be installed with dams constructed within reaches inhabited by local populations, to ensure that the local populations are not genetically affected by the hatchery-reared charr.…”

Section: Discussionmentioning

confidence: 99%

Genetic diversity and population structure of white-spotted charr, Salvelinus leucomaenis, in the Lake Biwa water system inferred from AFLP analysis

et al. 2008

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The genetic variations-and the time dependence of such variations-of natural populations of the white-spotted charr ,Salvelinus leucomaenis, in the Lake Biwa water system as well as those of a hatchery-reared population were inferred from AFLP. Upon the application of principal coordinate analysis using 118 polymorphic AFLP fragments based on the Jaccard similarity index, specimens of each of six natural local populations from the inlet rivers of Lake Biwa grouped roughly together, suggesting that each local population was genetically differentiated. The hatchery-reared population was shown to be closely related to the local population in the Seri River, suggesting that the Seri River population originated from hatchery-reared charr due to extensive stocking.

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“…The abundance and biomass of the study site were relatively high among salmon rivers of Hokkaido, since those in riffles of study sites in August were 15th in abundance and 14th in biomass among 117 riffle sites in summer of 1992(Hokkaido Fish Hatchery 1993-1997. (Mayama 1999;Takami et al 2002), and the first three species were found in the study site.…”

Section: Study Sitementioning

confidence: 98%

Abundance of salmon carcasses at the upper reach of a fish trap

Ito¹,

Nakajima²,

Saito

2004

Ecological Research

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Abundance, biomass and retention of salmon carcasses (Oncorhynchus keta and O. masou masou) were studied in a spring-fed tributary, the Naibetsu River, Chitose River system, Hokkaido, northern Japan, in 1998-2003, where almost all adult salmon were caught for a salmon enhancement program by a fish trap at the lower reach every fall. The abundance and biomass fluctuated seasonally, with two peaks in fall and winter, and annually. The total number of carcasses in fall was significantly correlated with the highest water level at lower reach in fall, indicating that the adult salmon swam over the trap at flood. Carcass abundance in winter may depend on the population size spawned in the wild at the upper reach, since the trap was removed in this season. Since the large wood debris and gravel were absent or scarce, many carcasses were lost from the study site within 20 days and a few carcasses remained over 31 days. Carcass removal by some terrestrial animals from the study site was detected.

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Replacement of White-spotted Charr Salvelinus leucomaenis by Brown Trout Salmo trutta in a Branch of the Chitose River, Hokkaido.

Cited by 38 publications

References 0 publications

Comparison of competitive ability between native and introduced salmonids: evidence from pairwise contests

Comparison of competitive ability between native and introduced salmonids: evidence from pairwise contests

Genetic diversity and population structure of white-spotted charr, Salvelinus leucomaenis, in the Lake Biwa water system inferred from AFLP analysis

Abundance of salmon carcasses at the upper reach of a fish trap

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