Food resources and ingestion patterns of insects along a West Coast, South Island, river system

Winterbourn, Michael J.; Cowie, Brent; Rounick, J. S.

doi:10.1080/00288330.1984.9516027

Cited by 40 publications

(29 citation statements)

References 16 publications

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“…Animals were sorted from the substrate at 40x magnification, and were identified to the lowest taxonomic level possible. Species were assigned to functional feeding groups according to Winterbourn et al (1984) and Chadderton (1988).…”

Section: Study Sites and Methodsmentioning

confidence: 99%

Variations in benthic fauna between differing lake outlet types in New Zealand

Harding

1994

New Zealand Journal of Marine and Freshwater Research

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Physico-chemical conditions and macroinvertebrate faunas of 20 South Island lake outlets were investigated in summer-early autumn of 1990-94. Four outlet types were recognised: unregulated alpine, unregulated mid/low elevation, regulated hypolimnetic and regulated epilimnetic outlets. Alpine outlet waters had significantly lower (P < 0.05) alkalinities and conductivities (6-12mg l -1 CaCO 3 and 13-45 µS cm -1 ) than all other outlets (11-36mg l -1 CaCO 3 and 36-93 µS cm -1 ), whereas pH values were similar among outlet types. Substrate size was significantly greater in modified epilimnetic than natural mid/low elevation outlets (P < 0.01). Total number of taxa and invertebrate densities were significantly lower in alpine and hypolimnetic outlets than natural mid/low elevation outlets (P < 0.05, and P < 0.01 respectively), and distinct differences were observed in the relative abundances of major taxonomic groups. Alpine streams were dominated by the mayflies Deleatidium (Leptophlebiidae), and Nesameletus (Siphlonuridae), the gripopterygid stonefly Zelandoperla decorata and predatory hydrobiosid caddisflies; molluscs were absent, and filter-feeding hydropsychid caddisflies rare. In contrast, the hypolimnetic outlets were dominated by filterfeeding hydropsychids (87-93% of the fauna), and no stoneflies were found. Epilimnetic and unregulated mid/low elevation outlets had similar communities, however invertebrate densities were significantly lower in regulated surface release outlets. Altitude, outlet width, velocity, con- Received 6 July 1994; accepted 3 November 1994 ductivity, and percentage of the catchment in forest, were all implicated as factors explaining differences in community composition. M94031

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Section: Study Sites and Methodsmentioning

confidence: 99%

Variations in benthic fauna between differing lake outlet types in New Zealand

Harding

1994

New Zealand Journal of Marine and Freshwater Research

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“…Our study animal, the leptophlebiid mayfly Deleatidium spp., is a ubiquitous member of New Zealand stream faunas, comprising as much as 90% of total macroinvertebrate numbers in streams of the Taieri River catchment (Scarsbrook and Townsend 1993). It is impossible, given current taxonomy, to identify individual species of Deleatidium as nymphs, although two species groups are recognized (Winterbourn and Gregson 1989).…”

mentioning

confidence: 99%

“…Deleatidium is a collector-browser and consumes a large amount of algae (Rounick et al 1982;Winterbourn et al 1984;Collier and Winterbourn 1990). If brown trout were inhibiting mayfly grazing during the day, then we would expect mayflies from streams with trout to have more algae in their guts at night than during the day.…”

mentioning

confidence: 99%

Impacts of an introduced predatory fish on mayfly grazing in New Zealand streams

McIntosh

Townsend

1995

Limnology & Oceanography

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The replacement of native common river galaxias (Galaxias vulgaris Stokell) by introduced brown trout (Salmo trutta L.) in many streams of the Taieri River system, New Zealand, has altered the predation regime for Deleatidium mayfly nymphs. Brown trout present a higher predation risk to mayfly prey during the day than at night but common river galaxias present similar risks both day and night. To determine whether this alteration has changed mayfly grazing behavior, we investigated the diel gut fullness of Deleatidium nymphs in five galaxias streams and five trout streams. Gut fullness was measured by the fluorescence of algal pigments extracted from Deleatidium guts. Nymphs from trout streams generally had fuller guts at night, whereas nymphs from galaxias streams tended to have more in their guts during the day or similar amounts both day and night. The difference reflects the high predation risk presented by brown trout during the day, restricting mayfly access to the algae‐rich upper surfaces of stones. These results indicate that the influence of predatory fish on mayfly grazing is detectable at a large spatial scale in the Taieri River system.

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“…The mid-gut of individuals was then dissected for analysis. Stomach contents were placed in vials and stained with Bengal´s rose colorant for 24 h. These samples were then transferred to distilled water and mixed; fifteen fields per slide were randomly selected and food items were counted under a microscope at a 400 X magnification (Winterbourn et al, 1984;Díaz-Villanueva and Albariño, 1999). For each item, the length and area covered were measured with a graduate eyepiece, and the relative abundance was expressed as a percentage of the area occupied by the total gut content (Winterbourn et al, 1984;Jaarsma et al, 1998;Díaz-Villanueva and Albariño, 1999;Muñoz et al, 2009).…”

Section: Gut Content Analysismentioning

confidence: 99%

Dieta de Pomacea canaliculata (Gastropoda: Ampullariidae) en su hábitat natural basada en análisis de contenidos digestivos e isótopos estables

et al. 2016

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Pomacea canaliculata is native to Rio de la Plata basin, and it is invasive in most of South and Southeast Asia after accidental introduction during unsuccessful attempts to establish commercial aquaculture of this species, and being present, the number one pest of rice crops in the region. Investigations in its native habitat are still needed because fundamental issues of its trophic ecology remain unknown. The aim of this research was to study the diet of P. canaliculata in its natural habitat through gut content techniques and stable isotopes of 13C and 15N. Biological samples were taken from November 2009 to December 2010 in Carnaval stream, a characteristic Pampean stream. Samples for stable isotopes of 13C and 15N using of a mixing model were collected in November 2011. The trophic strategy diagram evinced a generalist diet with high consumption of detritus followed by the vascular plants and algae. The mixing model results indicated that the relative contribution to the diet was similar for all basal resources: fine and coarse particulate organic matter, epipelon and aquatic macrophytes (approximately 40 %). These results evidenced a strong dietary plasticity for the species.

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Food resources and ingestion patterns of insects along a West Coast, South Island, river system

Cited by 40 publications

References 16 publications

Variations in benthic fauna between differing lake outlet types in New Zealand

Variations in benthic fauna between differing lake outlet types in New Zealand

Impacts of an introduced predatory fish on mayfly grazing in New Zealand streams

Dieta de Pomacea canaliculata (Gastropoda: Ampullariidae) en su hábitat natural basada en análisis de contenidos digestivos e isótopos estables

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