Incidence of a skeletal deformity (truncated upper jaw) in an isolated population of white-spotted charr Salvelinus leucomaenis

Yamamoto, Shoichiro; Morita, Kentaro; Yokoyama, Ryoichi; Miyamoto, Kouta; Sato, Mariko; Maekawa, Koji

doi:10.1134/s0032945213100159

Cited by 13 publications

(7 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although genetic diversities of the Yunishi River populations are not extremely low (average heterozygosities ranging from 0.28 to 0.57) compared with the other isolated populations of white-spotted charr (e.g., average heterozygosities ranging from 0.35 to 0.63 (Yamamoto et al 2004), 0.19 to 0.67 (Kubota et al 2007) and 0.07 to 0.56 (Yamamoto et al 2013), the genetic diversity of these isolated populations is expected to continue to decrease in the future (Yamamoto et al 2004). In fact, mean heterozygosity of the Yunishi River populations decreased significantly for half a decade (Yamamoto 2010).…”

Section: Discussionmentioning

confidence: 88%

“…) and 0.07 to 0.56 (Yamamoto et al. ), the genetic diversity of these isolated populations is expected to continue to decrease in the future (Yamamoto et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…; Yamamoto et al. ). The genetic changes may also have effects on demographic processes by causing a decrease in fecundity, growth rate, survival, developmental stability and competitive ability (Quattro & Vrijenhoek ; Vrijenhoek ).…”

Section: Discussionmentioning

confidence: 99%

“…Relationship between genetic [Fst/(1ÀFst)] and geographical distance for 12 white-spotted charr populations. and fluctuating asymmetry of meristic characters in isolated populations of white-spotted charr (Morita & Yamamoto 2000;Sato 2006;Morita et al 2009;Yamamoto et al 2013). The genetic changes may also have effects on demographic processes by causing a decrease in fecundity, growth rate, survival, developmental stability and competitive ability (Quattro & Vrijenhoek 1989;Vrijenhoek 1994).…”

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Census and effective population sizes of white‐spotted charr (Salvelinus leucomaenis) in a fragmented landscape

Yamamoto

Kubota

Hasegawa

et al. 2015

Ecology of Freshwater Fish

View full text Add to dashboard Cite

Several habitat models have been proposed to predict population size for stream fishes and to guide habitat assessment and monitoring techniques. However, most models do not incorporate the potential advantage of molecular genetic markers. We conducted a field survey and microsatellite DNA analyses to quantify the relationships among genetic diversity, census/effective population size and habitat variables in fragmented populations of white‐spotted charr (Salvelinus leucomaenis). The census population size significantly increased with the stream length, the number of pools and a pool‐riffle sequence index, a proxy for channel‐unit habitat type complexity within reaches. Population density was correlated with the pool‐riffle sequence index only. Genetic diversity and effective population size were not correlated with the habitat variables or census population size. There was a lack of isolation‐by‐distance population structure in the studied populations. Our results suggest that stream length and the number of pools within reaches associated with habitat complexity are the habitat variables that explain the majority of variation in population size of white‐spotted charr. Our findings provide further evidence that census population size per se is a poor indicator of the inclusive genetic diversity within populations in a fragmented landscape.

show abstract

Section: Discussionmentioning

confidence: 88%

“…) and 0.07 to 0.56 (Yamamoto et al. ), the genetic diversity of these isolated populations is expected to continue to decrease in the future (Yamamoto et al. ).…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Census and effective population sizes of white‐spotted charr (Salvelinus leucomaenis) in a fragmented landscape

Yamamoto

Kubota

Hasegawa

et al. 2015

Ecology of Freshwater Fish

View full text Add to dashboard Cite

show abstract

“…Shikano et al, 2005;Tiira et al, 2006;Yamamoto et al, 2013). Moreover, the frequency of deformed fish correlates with their population size.…”

Section: Discussionmentioning

confidence: 90%

High frequency of deformations in Dolly Varden charr (Salvelinus malma , Walbaum, 1792), an introduced population

Sahashi¹

2015

J. Appl. Ichthyol.

View full text Add to dashboard Cite

The past, present, and a future for native charr in Japan

Fausch,

Morita,

Tsuboi

et al. 2024

Ichthyol Res

View full text Add to dashboard Cite

Charrs (Salvelinus) reach their southernmost distribution in Japan, and are uniquely adapted to the short, steep streams of this island archipelago. Southern Asian Dolly Varden (Salvelinus curilus) occur only in Hokkaido Island, whereas white-spotted charr (Salvelinus leucomaenis) range to southern Honshu. Both species diverged from an ancestral lineage during the late Pliocene/early Pleistocene, when lowered sea levels created semi-enclosed water bodies in the seas of Japan and Okhotsk. Genetic analyses showed S. curilus represents the most ancient divergence from the Dolly Varden (Salvelinus malma) - Arctic charr (Salvelinus alpinus) group, and revealed five lineages of S. leucomaenis which align differently than traditional subspecies. Japanese charr display diverse and flexible life histories including anadromous fish with partial migration, and fluvial, adfluvial, and resident forms. In Hokkaido, Dolly Varden are distributed upstream and white-spotted charr downstream. They coexist in narrow sympatric zones through adaptive shifts by Dolly Varden in behavior and morphology that facilitate benthic foraging. Both species hybridize with native and nonnative salmonids, and are displaced from microhabitats and decline in abundance when rainbow trout (Oncorhynchus mykiss) and brown trout (Salmo trutta) invade. Japan streams contain over 95,000 erosion control dams which create short stream fragments (medians ~200 m). This has increased extirpation of charr populations via lower genetic diversity and stochastic and demographic factors. Tributaries provide complex rearing habitats, afford refuges from floods, and supply recruits that sustain populations in mainstem fragments and create metapopulations in connected riverscapes. Charr play central roles in linked stream-riparian food webs, and cause direct and indirect effects that cascade to streambed algae and riparian predators when linkages are disrupted by anthropogenic effects or altered by native parasites. Many charr populations are threatened by habitat fragmentation and introgression or invasion by nonnative forms, but efforts to conserve charr are growing. These include restoring connectivity among pure populations above barriers that prevent invasions, protecting tributary nurseries, and instituting angling regulations to protect headwater populations. Key steps include inventorying pure populations, identifying conservation units, selecting appropriate management based on connectivity and biotic interactions, and engaging stakeholders and youth to engender an ethic for conserving irreplaceable charr lineages.

show abstract

Incidence of a skeletal deformity (truncated upper jaw) in an isolated population of white-spotted charr Salvelinus leucomaenis

Cited by 13 publications

References 28 publications

Census and effective population sizes of white‐spotted charr (Salvelinus leucomaenis) in a fragmented landscape

Census and effective population sizes of white‐spotted charr (Salvelinus leucomaenis) in a fragmented landscape

High frequency of deformations in Dolly Varden charr (Salvelinus malma , Walbaum, 1792), an introduced population

The past, present, and a future for native charr in Japan

Contact Info

Product

Resources

About