Evidence that an ontogenetic niche shift by native masu salmon facilitates invasion by nonnative brown trout

Hasegawa, Kou; Yamazaki, Chitose; Ohkuma, Kazumasa; Ban, Masatoshi

doi:10.1007/s10530-012-0211-3

Cited by 19 publications

(26 citation statements)

References 17 publications

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“…The emergence season of Age‐0 brown trout in the Chitose River occurs around the beginning of May (Hasegawa et al. ,b; K. Hasegawa unpublished data) and overlaps with the occurrence of snowmelt floods. This overlap could negatively influence the brown trout establishment.…”

Section: Discussionmentioning

confidence: 99%

“…Hasegawa et al. () found Age‐0 brown trout via underwater observation in late May, and they caught 14 Age‐0 fish (mean fork length: 30 mm) by electrofishing in the Mamachi stream, a tributary of the Chitose River on 5 May 2010 (K. Hasegawa unpublished data). Thus, the emergence season of brown trout Age‐0 in the Chitose River occurs approximately in May.…”

Section: Methodsmentioning

confidence: 99%

“…; Hasegawa et al. ), the abiotic factors controlling brown trout establishment are not fully understood.…”

Section: Introductionmentioning

confidence: 99%

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The relationship between the snowmelt flood and the establishment of non‐native brown trout (Salmo trutta) in streams of theChitoseRiver,Hokkaido, northernJapan

Kawai

Ishiyama

Hasegawa

et al. 2013

Ecology of Freshwater Fish

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Flow regime is one of the major determinants of establishment success for non‐native aquatic organisms. Here, we examine the influence of flow variability associated with snowmelt flood on the establishment success of non‐native brown trout in 10 streams in northern Japan. We regarded the presence of Age‐0 brown trout as the index of the successful establishment. The emergence of Age‐0 brown trout in our study region begins in May, a time that overlaps with the occurrence of snowmelt flood. The presence of Age‐0 brown trout was negatively associated with flow variability, and it was also negatively associated with summer water temperature. Our results indicate that the non‐native brown trout tends to establish in the streams with smaller snowmelt floods and lower summer water temperatures. Brown trout is an invasive, non‐native species that is problematic all over the world, and effective management strategies for preventing their further expansion are urgently needed. This study suggests that river managers should recognise that stable streams such as spring‐fed streams (i.e., low flow and summer water temperature) and flow‐regulated streams, have a higher potential risk of brown trout invasion.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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The relationship between the snowmelt flood and the establishment of non‐native brown trout (Salmo trutta) in streams of theChitoseRiver,Hokkaido, northernJapan

Kawai

Ishiyama

Hasegawa

et al. 2013

Ecology of Freshwater Fish

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“…The introduction or establishment of nonnative competitors or predators can alter ecological conditions and hinder reintroduction efforts (Vitousek 1990;Olden et al 2004;Simberloff 2011). This issue is typified by salmonids because meeting freshwater habitat and ecological requirements at the juvenile stage is made more challenging by the presence of nonnative species with similar habitat requirements (e.g., Hearn and Kynard 1986;Scott et al 2005;Hasegawa et al 2012). Such niche overlap can lead to competition and predation and can impede the successful reintroduction of native populations (Vitousek 1990;Olden et al 2004;Simberloff 2011).…”

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confidence: 99%

Effects of Competition with Four Nonnative Salmonid Species on Atlantic Salmon from Three Populations

Houde¹,

Wilson²,

Neff³

2015

Trans Am Fish Soc

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The presence of ecologically similar nonnative species may impede recovery efforts for native species. We assessed the survival and growth of juvenile Atlantic Salmon Salmo salar from three populations (LaHave River, Sebago Lake, and Lac Saint‐Jean) in the presence of four naturalized nonnative salmonid competitors. The three populations are being used for reintroduction efforts in Lake Ontario, where Atlantic Salmon are extirpated. Juvenile Atlantic Salmon were placed into artificial stream tanks with combinations of juvenile Brown Trout S. trutta, Rainbow Trout Oncorhynchus mykiss, Chinook Salmon O. tshawytscha, and Coho Salmon O. kisutch. Survival of all three Atlantic Salmon populations was lower in the presence of Brown Trout; growth was lower in the Brown Trout treatment and in the multispecies treatment. In contrast, Atlantic Salmon survival and growth were not negatively impacted by the presence of Chinook Salmon, Rainbow Trout, or Coho Salmon. Based on measurements of circulating hormones, Atlantic Salmon were not chronically stressed and did not show a change in social status after 10 months in the artificial stream tanks. Our results support the theory that differences in aggression and niche overlap can influence competitive outcomes and suggest that tributaries containing Brown Trout should be avoided during Atlantic Salmon reintroduction into Lake Ontario.

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“…However, competitive behavior such as aggression is inherently different between Salmo and Oncorhynchus species (Hasegawa et al 2012). Thus, the relative intensities of the two types of competition are likely to be different between masu and chum salmon.…”

Section: Discussionmentioning

confidence: 99%

Effects of hatchery chum salmon fry on density-dependent intra- and interspecific competition between wild chum and masu salmon fry

HasegawaKoh

Morita

OhkumaKazumasa

et al. 2014

Can. J. Fish. Aquat. Sci.

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Stocking with hatchery fish is the principal method for harvest augmentation and, recently, restoring endangered populations. However, there is increasing concern about the negative effects of competition between hatchery and wild fish. In this study, enclosure experiments were conducted to evaluate the effects of hatchery chum salmon fry (Oncorhynchus keta) on wild masu (Oncorhynchus masou) and chum salmon fry through density-dependent competition. For masu and chum salmon, densitydependent performance (foraging rate and growth) varied depending on the presence or absence of competitor species. The negative effects on the foraging rate (evaluated by stomach content mass) and growth of wild masu salmon caused by wild conspecifics were greater than those exerted by wild and hatchery chum salmon. Wild chum salmon decreased foraging rate with increasing density of conspecifics and masu salmon and also in the presence of hatchery chum salmon. Although we could not evaluate growth under interspecific competition, wild chum salmon show body mass loss in the presence of hatchery chum salmon. These results suggest that the effects of stocking with hatchery chum salmon vary depending on the interacting species.Résumé : L'empoissonnement avec des poissons d'élevage est la principale méthode d'augmentation des récoltes et, récem-ment, de rétablissement de populations en péril. Les effets négatifs de la concurrence entre poissons d'élevage et poissons sauvages suscitent cependant des inquiétudes croissantes. Dans cette étude, des expériences en enclos ont été menées afin d'évaluer les effets causés par la concurrence dépendant de la densité d'alevins d'élevage de saumon kéta (Oncorhynchus keta) sur des alevins sauvages de saumons masou (Oncorhynchus masou) et kéta. Pour les saumons masou et kéta, la performance dépendant de la densité (taux d'alimentation et croissance) variait selon la présence ou non d'espèces concurrentes. Les effets négatifs sur le taux d'alimentation (évalué à la lumière de la masse du contenu stomacal) et sur la croissance des saumons masou sauvages causés par des conspécifiques sauvages étaient plus grands que ceux causés par des saumons kéta sauvages ou d'élevage. Le taux d'alimentation des saumons kéta sauvages diminuait à mesure qu'augmentait la densité de conspécifiques et de saumons masou, et aussi en présence de saumons kéta d'élevage. Bien que nous n'ayons pas pu évaluer la croissance en situation de concurrence interspécifique, les saumons kéta sauvages présentent une diminution de leur masse corporelle en présence de saumons kéta d'élevage. Ces résultats laissent croire que les effets de l'empoissonnement de saumons kéta d'élevage varient selon les espèces en présence. [Traduit par la Rédaction]

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Evidence that an ontogenetic niche shift by native masu salmon facilitates invasion by nonnative brown trout

Cited by 19 publications

References 17 publications

The relationship between the snowmelt flood and the establishment of non‐native brown trout (Salmo trutta) in streams of theChitoseRiver,Hokkaido, northernJapan

The relationship between the snowmelt flood and the establishment of non‐native brown trout (Salmo trutta) in streams of theChitoseRiver,Hokkaido, northernJapan

Effects of Competition with Four Nonnative Salmonid Species on Atlantic Salmon from Three Populations

Effects of hatchery chum salmon fry on density-dependent intra- and interspecific competition between wild chum and masu salmon fry

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