The impact of introduced brown and rainbow trout on native fish: the case of Australasia

Crowl, Todd A.; Townsend, Colin R.; McIntosh, Angus R.

doi:10.1007/bf00045038

Cited by 213 publications

(167 citation statements)

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“…Large trout are presumably able to prey on all sizes of inanga, as well as many of the other stream galaxiids, which may at least partly explain why small galaxiids are generally uncommon or absent from streams containing largertrout (Mclntosh 2000;Crowl et al 1992). Sagar (1993) found remains of inanga whitebait in the gut of adult brown trout in a small stream.…”

Section: Journal Of the Royal Society Of New Zealand Volume 34 2004mentioning

confidence: 99%

“…Furthermore, galaxiid populations may have declined in response to habitat modification and degradation associated with the substantial land-use changes that have occurred throughout most of New Zealand since European colonisation (Allen 1961;Hanchet 1990;McDowall 1990;Crowl et al 1992).…”

Section: Introductionmentioning

confidence: 99%

“…Cadwallader (1975) suggested that the presence of juvenile brown trout explained declines in G. vulgaris populations in Canterbury, and Mclntosh et al (1992) concluded that interspecific competition for space, perhaps combined with competition for food and predation by trout, could explain declines in Otago galaxiid populations. Both Crowl et al (1992) and McDowall (2003) discussed the roles of predation and competition between trout and galaxiids, and suggested that clarification of the processes responsible for negative interactions should form the basis for informed conservation protocols.…”

Section: Introductionmentioning

confidence: 99%

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The influence of juvenile brown trout (Salmo trutta)on habitat use of inanga(Galaxias maculatus)in a stream simulator

Bonnett

McIntosh

2004

Journal of the Royal Society of New Zealand

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Introduced salmonid fishes may have affected native galaxiid fishes in New Zealand by forcing alterations in their use of spatial resources. A stream simulator was used to test the effects of juvenile brown trout (Salmo trutta) (fork length range 66-115 mm) on habitat use of inanga (Galaxias maculatus) (fork length range 51-100 mm) during autumn. The stream simulator consisted of a single run-riffle-pool sequence lined with gravel and cobble substrates, and c. 8 m 3 of untreated artesian water was recirculated through the stream simulator at a rate of 3 litres s -1. Stream invertebrates were introduced into the stream simulator to provide food for the fish. Four experiments were run, each consisting of three 1-day trials using either 10 inanga, 20 inanga, or 10 inanga and brown trout. Counts of inanga visible in each of 12 designated habitat zones were made throughout the day, and proportions of visible inanga were used in repeated measure ANOVAs to test whether the proportion of fish visible varied according to the time of day, the density of inanga, or the presence of trout. Our experiments showed that neither the presence of juvenile brown trout nor the density of inanga had significant influence on inanga habitat use in the stream simulator. We conclude that in New Zealand streams any influence of brown trout on inanga is more likely to result from predation and/or competition for food by larger brown trout.

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Section: Journal Of the Royal Society Of New Zealand Volume 34 2004mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The influence of juvenile brown trout (Salmo trutta)on habitat use of inanga(Galaxias maculatus)in a stream simulator

Bonnett

McIntosh

2004

Journal of the Royal Society of New Zealand

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“…Anthropogenic disturbances to physical habitat, including degradation of habitat, stream alterations, and loss of stream connectivity, have led to the reduction and loss of several species (Richter et al 1997, Zabel & Williams 2002, Wang et al 2008, Volcan et al 2011) and have also altered species assemblages (Cumming 2004, Fischer & Paukert 2008, Jowett et al 2009). Other factors that have led to the loss or decline of freshwater species include reductions of water quality from pollution (Austin 1998, Bonner & Wilde 2002 and the introduction of non-native species (Lynch 1988, Crowl et al 1992, Rahel 2002.…”

Section: Introductionmentioning

confidence: 99%

Changes in range-wide distribution of plains topminnow Fundulus sciadicus

Pasbrig¹,

Koupal²,

Schainost³

et al. 2012

Endang. Species. Res.

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Globally, riverine fishes are affected by degradation of habitat, stream alterations, lost stream connectivity and introduction of non-native species. The plains topminnow Fundulus sciadicus, a small stream-dwelling fish, currently does not have a federal conservation status in the USA; however, anecdotal reports have suggested its decline for the last 20 yr. Our goals were to evaluate the validity of its reported decline and to determine the current range-wide status of this species. We identified 927 historical sites (1889−1999) of occurrence and compiled recent records or re-visited 667 sites (2000−2010). We found plains topminnow at 189 (28.0%) of these sites. Although Nebraska represented the center of distribution and included 66.7% of all historical sites, plains topminnow were only found at 34.4% of historical sites, with the largest declines observed in the Platte and Republican River drainages. Current sampling efforts in Colorado, Missouri, Oklahoma, South Dakota and Wyoming found similar declines. In Iowa and Kansas, plains topminnow was not found, whereas potential increases in distribution were observed in a single drainage in Minnesota and Wyoming. In addition to our sampling efforts, we repeatedly sampled 40 sites within Nebraska to determine detection probability. Detection probabilities for plains topminnow were consistent at 0.76 ± 0.05 (mean ± SE) among sites that were sampled with a single visit. Further research is needed on the species and the potential threats to its occupation of sites, as no singular cause for decline seems plausible. Observed threats include degradation and loss of habitat and shifts in species assemblages towards generalist non-native species. 16: 235-247, 2012 ditionally, lotic systems are geographically expansive and can be influenced by multiple alterations and disturbances at the same time, which makes determining the primary causes for species decline and loss difficult (McCartney 2002). KEY WORDS: Fundulus sciadicus · Plains topminnow · Fundulidae · Endemic · Decline · Threat Resale or republication not permitted without written consent of the publisher Contribution to the Theme Section 'Endangered river fish: threats and conservation options' OPEN PEN ACCESS CCESSEndang Species ResThe plains topminnow Fundulus sciadicus is en demic to the central United States (Fig. 1) with 2 disjunct populations (Lee et al. 1980). The largest distribution is centered in Nebraska and extends to north eastern Colorado, southwestern Wyoming, southern South Dakota, southwestern Minnesota and Iowa (Baxter & Stone 1995, Weitzel 2002, Rahel & Thel 2004. The second population is centered in Missouri and ex tends from Kansas south to Oklahoma (Pflieger 1997) (Fig. 2). The plains topminnow is currently ranked as globally secure according to the Natural Heritage database (NatureServe 2011). However, all states in the native range, except Oklahoma, recognize some level of concern for plains topminnow. In Iowa and Kansas, plains topminnow is presumed extirpated (Harlan et al...

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“…Dentre os efeitos diretos destacam-se a extinção de espécies nativas (Usher 1988, Rapoport 1977; mudança na estrutura original da comunidade nativa (Moyle 1976, Li & Moyle 1981, Balon & Bruton 1986; competição por alimento, abrigo, sítios de desova e criação (Fryer 1961); predação (Zaret & Paine 1973); introdução de parasitas ou doenças (Courtenay & Meffe 1989, Ross 1991, Crowl et al 1992) e hibridização (Couternay & Stauffer 1984, Welcomme 1988, Kennedy 1993. As espécies introduzidas podem também afetar indiretamente a fauna nativa através da alteração nas condições do hábitat e/ou nos processos dos ecossistemas pelo forrageamento entre outras atividades (Taylor et al 1984, Arthington & McKenzie 1997.…”

Section: Introdução De Espéciesunclassified

Biologia populacional de Pachyurus bonariensis Steindachner, 1879 (Perciformes, Sciaenidae), uma espécie alóctone no sistema hidrográfico da laguna dos patos, Brasil

Dufech

Fialho

2007

Biota Neotrop.

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O gênero Pachyurus é amplamente distribuído nas maiores bacias hidrográficas da América do Sul, sendo representado na região sul do continente somente pela espécie Pachyurus bonariensis, na bacia do Prata (rios Uruguai, Paraná e Paraguai). A ocorrência desta espécie no sistema hidrográfico da laguna dos Patos é recente. Além disso, pouco se sabe acerca da biologia populacional e distribuição de P. bonariensis nessa região. Nesse sentido, foram analisados os seguintes aspectos populacionais da espécie: abundância, constância de ocorrência, dimorfismo sexual e proporção sexual. Discute-se ainda, o estabelecimento de P. bonariensis no sistema hidrográfico da laguna dos Patos. Os espécimes foram amostrados na praia das Pombas, lago Guaíba, Parque Estadual de Itapuã, Estado do Rio Grande do Sul. Foram capturados 101 indivíduos, sendo 82 fêmeas, 15 machos e quatro sexualmente imaturos. A espécie foi constante ao longo do período de estudo (junho de 2002 a julho de 2003), sendo sua abundância mais elevada em janeiro e abril de 2003. As fêmeas foram maiores e significativamente mais abundantes que os machos (χ 2 = 43,12; p < 0,05). Esses resultados, juntamente com a identificação de fêmeas sexualmente maduras, sugerem atividade reprodutiva desta espécie, indicando que P. bonariensis é uma espécie alóctone que se estabeleceu com sucesso no sistema da laguna dos Patos.Palavras-chave: peixes, Maria-Luiza, sul do Brasil, introdução.

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The impact of introduced brown and rainbow trout on native fish: the case of Australasia

Cited by 213 publications

References 100 publications

The influence of juvenile brown trout (Salmo trutta)on habitat use of inanga(Galaxias maculatus)in a stream simulator

The influence of juvenile brown trout (Salmo trutta)on habitat use of inanga(Galaxias maculatus)in a stream simulator

Changes in range-wide distribution of plains topminnow Fundulus sciadicus

Biologia populacional de Pachyurus bonariensis Steindachner, 1879 (Perciformes, Sciaenidae), uma espécie alóctone no sistema hidrográfico da laguna dos patos, Brasil

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