Production of fish in two small streams in the north island of New Zealand

Hopkins, C. L.

doi:10.1080/00288330.1971.9515381

Cited by 41 publications

(30 citation statements)

References 6 publications

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“…1992). Studies of the distributions of galaxiid species have frequently revealed fragmented distributions that generally do not overlap with trout (Hopkins 1971;Tilzey 1976;Fulton 1978;Cadwallader 1978Cadwallader , 1979Fletcher 1979;Jackson & Williams 1980;Jackson & Davies 1983;Main et al 1985;Minns 1990;Townsend & Crowl 1991). For example, Townsend & Crowl ( 1991 ) found that the presence of barrier waterfalls, which blocked the upstream migration of trout, was the best predictor of galaxiid presence in a study of 198 sites in the Taieri River system in the South Island of New Zealand.…”

Section: Introductionmentioning

confidence: 99%

Size‐related impacts of introduced brown trout on the distribution of native common river galaxias

McIntosh

Crowl

Townsend

1994

New Zealand Journal of Marine and Freshwater Research

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The impact of small (fork length < 100 mm) and large ( 100 mm) brown trout (Salmo trutta L.) on the distribution of the common river galaxias (Galaxias vulgaris Stokell) was investigated in the Shag River (South Island, New Zealand). Riffle reaches were sampled by electrofishing and their macrohabitat was described in terms of substratum, flow, elevation, and vegetation characteristics. Galaxias densities in reaches containing large trout were lower than reaches with only small trout or no trout and trout size was the most important variable determining galaxias density. Densities of galaxias < 80 mm were reduced in the presence of large trout, but not galaxias > 80 mm. Reaches with large, small, or no trout varied in terms of water depth, percentage cobble, and elevation. However, these differences were unlikely to account for variations in galaxias densities because selection for these particular habitat features accounted for only a small proportion of the observed variation in galaxias density. A change in macrohabitat use by galaxias from fast current velocities in sites without trout to slower velocities in sites with large trout may be explained by competition for areas of high velocity (potentially the better feeding areas). However, a Received 30 September 1993; accepted 18 January 1994 combination of interspecific competition and predation by large brown trout is likely to be responsible for the observed reductions in the density of smaller galaxias. M93050

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Section: Introductionmentioning

confidence: 99%

Size‐related impacts of introduced brown trout on the distribution of native common river galaxias

McIntosh

Crowl

Townsend

1994

New Zealand Journal of Marine and Freshwater Research

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“…Although the introduction of salmonids has been implicated in this process (McDowall 1968;Townsend & Crowl 1991), changes in land use are also thought to influence it (Hanchet 1990;McDowall 1990;Minns 1990). In particular, large galaxiids, such as the banded kokopu (Galaxias fasciatus) and the koaro (Galaxias brevipinnis) are common in streams running through indigenous forest (Hopkins 1979;Rowe 1981;Hanchet 1990), but are usually absent, or rare, in pasture streams (Phillipps 1926;Rowe 1981;Hayes et al 1989;Hanchet 1990). Thus, their decline has been attributed to conversion of native forest to pasture (McDowall 1990;Hanchet 1990;Rowe et al 1992).…”

Section: Introductionmentioning

confidence: 99%

Effects of land use on native fish communities in east coast streams of the North Island of New Zealand

Rowe¹,

Chisnall

Dean

et al. 1999

New Zealand Journal of Marine and Freshwater Research

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The community structure, density, and biomass of native fish species was determined for first-to second-order streams draining mature pine, native forest, and pasture catchments in seven, North Island, New Zealand, east coast rivers or streams. Multiple-pass electric fishing was used to determine fish densities, and differences in fish community structure between land uses were detected using nonmetric multi-dimensional scaling analysis. Species responsible for changes in fish community structure were identified by comparing species densities between land uses. Six fish species occurred commonly within each drainage system and although there was no difference in fish community structure between streams in native or exotic forest, differences occurred between the fish communities of forested and pastoral streams. Pastoral streams contained more shortfinned eels (Anguilla australis), more inanga (Galaxias maculatus), and fewer banded kokopu (Galaxias fasciatus) than forested streams. Fish biomass was also higher in pastoral streams. We concluded that the type of forest (mature exotic pine versus mixed-species indigenous) had little effect on the native fish populations, but that pasture supported an increased fish density and biomass due mainly to increases in shortfinned eels. There were fewer banded kokopu in pasture than in forested streams, Received 15 December 1997; accepted 13 October 1998 but exotic forest streams contained as many banded kokopu as native forest streams. M97069

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“…III) indica que a produtividade de ambas as espécies varia significativamente ao longo do gradiente longitudinal da bacia de drenagem do rio Ubatiba (F Astyanax = 70,25; p<0,001 e F Geophagus = 24,16; p<0,001), mas seus valores médios são bem reduzidos em relação aos valores registrados para as espécies de riachos de regiões de clima temperado (e.g., HOPKINS, 1971;NEVES & PARDUE, 1983;LOBÓ N-CERVIÁ & PENCZAK, 1984;PENCZAK & MOLINSKI, 1984;MAHON & BALON, 1985;RODRÍGUEZ & GRANADO, 1991;CABRAL & MARQUES, 1999, FORMIGO & PENCZAK, 1999. A estrutura geológica, com formações pré-cambrianas e corredeiras basálticas (PICCIRILLO et al, 1988), caracteriza os riachos neotropicais e determina ambientes pobres em nutrientes, livres de macrófitas e sujeitos a freqüentes chuvas torrenciais que agem na " lavagem" do ambiente.…”

Section: Resultsunclassified

“…Este é o conceito que tem sido mais utilizado na literatura (e.g. HOPKINS, 1971;MANN & PENCZAK, 1986;MAZZONI, 1999; e será utilizado neste trabalho.…”

Section: Palavras-chaveunclassified

“…A produção de peixes tem sido objeto de diversos estudos em lagos (RYDER, 1965;DIANA, 1983;KELSO, 1988;RANDAL et al, 1995) e riachos (HOPKINS, 1971;PENCZAK, 1981;NEVES & PARDUE, 1983;WATERS, 1983;WHITWORTH & STRANGE, 1983;PENCZAK et al, 1985;MANN & PENCZAK, 1986;O'HARA & PENCZAK, 1987;NEWMAN & WATERS, 1989;PENCZAK, 1992) de regiões temperadas, porém são poucos os estudos realizados em outras regiões (BISHOP, 1973;KAPETSKY, 1974;WATSON & BALON, 1984;PENCZAK & LASSO, 1991). Para peixes tropicais brasileiros, apenas dois trabalhos estão disponíveis na literatura (i.e.…”

Section: Palavras-chaveunclassified

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Produtividade de peixes em um riacho costeiro da bacia do Leste, Rio de Janeiro, Brasil

Schubart

Mazzoni

2006

Iheringia, Sér. Zool.

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ABSTRACT. Fish production in a coastal stream from Bacia do Leste, Rio de Janeiro, Brazil. Production rates (P) and biomass (B) of two stream-dwelling fish species from seven sites in the Ubatiba drainage were studied during two years with contrasting rainfall indexes. In order to test the potential correlation between P, B and the Environmental Heterogeneity Index (EHI) of each site, simple correlation analyses were applied. The analyses did not show significant differences (p<0.01). Spatial pattern of P indicated that production rates of both species are highly homogeneous in the studied sites but are low when compared with other stream-dwelling fishes from the Holartic region. Mean P , B dry = 12.2 kg.ha -1 , with significant higher values during the dry year (t (B)= 2.41; p = 0.03 e t (P)= 2.28; p = 0.04). In spite of presenting a tendency similar to that found for A. hastatus, mean P and B values for Geophagus brasiliensis (Quoy & Gaimardi, 1824) did not show significant differences (t (B) = 1.5; p = 0.16 and t (P) = 1.75; p = 0.11) between years: P rainy = 25.2 kg. , com valores significativamente superiores durante o ano seco (t (B)= 2,41; p = 0,03 e t (P)= 2,28; p = 0,04). Apesar de ter apresentado tendência semelhante à registrada para A. hastatus, os valores de P e B de Geophagus brasiliensis (Quoy & Gaimardi, 1824) não se mostraram significativamente diferentes (t (B) = 1,5; p = 0,16 e t (P) = 1,75; p = 0,11) entre os anos de estudo, sendo P chuvoso = 25,2 kg.ha -1 .ano -1, P seco = 53,2 kg.ha -1 .ano -1 e B chuvoso = 16,6 kg.ha -1 , B seco = 29,7 kg.ha -1 . As reduções de P durante o ano de maior pluviosidade foram de 57% e 47% para A. hastatus e G. brasiliensis, respectivamente. Os valores médios da relação P/B mostraram tendência a redução em relação ao aumento de tamanho dos indivíduos de ambas as espécies.

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Production of fish in two small streams in the north island of New Zealand

Cited by 41 publications

References 6 publications

Size‐related impacts of introduced brown trout on the distribution of native common river galaxias

Size‐related impacts of introduced brown trout on the distribution of native common river galaxias

Effects of land use on native fish communities in east coast streams of the North Island of New Zealand

Produtividade de peixes em um riacho costeiro da bacia do Leste, Rio de Janeiro, Brasil

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