The adults and preimaginal stages of continental populations of Cricotopus (Cricotopus) beckeri Hirvenoja (Diptera, Chironomidae)

Hirvenoja, Mauri; Moubayed, Z.

doi:10.1051/limn/1989027

Cited by 7 publications

(8 citation statements)

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“…This discrepancy seems to give support to the idea of major differences between the two regions. However, a more detailed examination reveals the fact that slightly over half of these genera (33) are currently monolypic and the immature sta ges of 42 are recently described or unknown while most of the remaining genera contain only 2-6 spe cies (Table 2). Genera with few species are often res tricted to very specific habitats and thus less likely to be collected in random sampling.…”

Section: Palaearctic and Nearctic Regionsmentioning

confidence: 99%

The zoogeographical distribution of Chironomidae (Insecta : Diptera)

1987

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Section: Palaearctic and Nearctic Regionsmentioning

confidence: 99%

The zoogeographical distribution of Chironomidae (Insecta : Diptera)

1987

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“…Halocladius variabilis is a marine chironomid with a wide distribution that includes Greenland and the western North Atlantic and Arctic oceans, including the Baltic Sea and White Sea (Hirvenoja 1973, Colbo 1996, Hirvenoja et al 2006. It was previously reported in eastern Canada by Colbo (1996) from rocky shores in Newfoundland and by Giberson et al (2001) from salt marshes in Prince Edward Island.…”

Section: Introductionmentioning

confidence: 99%

Population ecology of the marine insect Halocladius variabilis (Diptera: Chironomidae) in the rocky intertidal zone of Nova Scotia, Canada

Garbary¹,

Jamieson²,

Taylor³

2009

Mar. Ecol. Prog. Ser.

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We studied the population ecology and productivity of the little-known marine insect Halocladius variabilis (Chironomidae) from the exposed rocky intertidal zone on the Atlantic coast of Nova Scotia, Canada. Larvae of H. variabilis are host-specific symbionts of the brown alga Elachista fucicola, which in turn is an abundant epiphyte on the dominant intertidal fucoid Ascophyllum nodosum. At our primary study site at Drum Head, A. nodosum frond density (mean ± SE) was 546 ± 46 fronds m -2 for fronds > 20 cm long. Density of E. fucicola on A. nodosum was highly variable seasonally, with median densities of 20 000 m -2 in July. Mean number of H. variabilis larvae per E. fucicola thallus varied from 0.8 ± 0.1 in November to 3.9 ± 0.3 in mid-July. Median density of larvae per frond of A. nodosum ranged from 0 in November to 246 in July. The latter number represents a median density of 59 500 larvae m -2 , making H. variabilis one of the most abundant marine insects known. Based on distributions of larval size, H. variabilis appears to be univoltine or possibly bivoltine. H. variabilis larvae were largest (6.48 ± 0.17 mm long) in May and smallest in late August (~2 mm), suggesting a mid-summer period of adult egg-laying. Larval production was conservatively estimated at 130 g m -2 yr -1 , making this also the most productive chironomid known from any habitat. The high population density and production suggest that H. variabilis is an important, but overlooked, component of marine rocky shores of the northwestern Atlantic. 376: 193-202, 2009 phylli, and the obligate epiphytic red alga Polysiphonia (Vertebrata) lanosa (Garbary & MacDonald 1995, Garbary & Deckert 2001, Garbary et al. 2005a. Cytological interactions among the algal and fungal components of this community have been described elsewhere (e.g. Garbary & Deckert 2001, Xu et al. 2008. A fourth member of this community is the brown, cushion-forming, obligate epiphyte Elachista fucicola, which is also abundant on Fucus species. When E. fucicola colonizes A. nodosum, it forms a cushion of tightly interwoven filaments from which arise abundant free filaments up to 2 cm long. Larvae of H. variabilis live among the basal filaments and feed on epiphytes on free filaments of E. fuciola (Garbary et al. 2005b). Although at least 3 other epiphytes are common on A. nodosum (Spongonema tomentosa, Ceramium virgatum, and Pilayella littoralis), at our study site, larvae of H. variabilis are found only associated with E. fucicola growing on A. nodosum (Garbary et al. 2005b). Elsewhere, Halocladius has been associated with other primary hosts on both A. nodusum and Fucus spp. (Johnson & Scheibling 1987, E. Tarakhovskaya & D. J. Garbary unpubl.). KEY WORDS: Chironomidae · Halocladius variabilis · Production · Life cycle · Ascophyllum nodosum · Marine insects Resale or republication not permitted without written consent of the publisherMar Ecol Prog SerThere are few studies on the abundance of chironomid larvae on rocky intertidal shores. Colman (1939) reported t...

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“…The aim of the present work was to compare the results obtained with different sets of characters, different numerical approaches (phenetics and cladistics) and Hennig's cladistics (Fig. 1), that is used at present by most systematists working with chironomids (Brundin, 1966;Schlee, 1968;Serra-Tosio, 1968;Hirvenoja, 1973;Saether, 1977).…”

Section: Resultsmentioning

confidence: 99%

Numerical, phenetic, and cladistic analyses: Problems and examples with Orthocladiinae (Diptera, Chironomidae)

Rossaro

1991

Bolletino di zoologia

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Ninety-one binary characters belonging to 58 genera and subgenera of Orthocladiinae (Diptera, Chironomidae) were filed in a matrix. Larval, pupal, adult male and female characters were analyzed. Trees obtained by different numerical (phenetic and cladistic) methods were compared. The set of selected characters seemed much more important for determining the final results than the numerical method used in computation. The polarity of character states did not substantially influence the final results. Consensus trees and the «bootstrap» method are the most promising techniques in resolving conflicting results obtained using different numerical methods or different sets of characters. In any case, time is probably better spent in character analysis than in testing the same data with different numerical methods. The largest set of characters available should be used, but both the redundant inclusion of correlated characters and an «a priori» injustified weighting should be avoided. The Hennigian trees are used by chironomid taxonomists extensively, but they have the drawback of assuming too rigid a hierarchy in character weighting. Both phenetic overall similarity and maximum parsimony trees used in the present analysis agree in their final results, provided that a large characters set be used in data analysis. To sum up, different classification methods give results that agree in major features, even if they differ in details. In any case, a single optimal phylogenetic tree is difficult to draw, because the large number of taxa and characters studied offer an enormous number of alternative solutions optimizing different criteria. Some useful steps in data analysis are proposed, that allow progress in numerical classification.

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The adults and preimaginal stages of continental populations of Cricotopus (Cricotopus) beckeri Hirvenoja (Diptera, Chironomidae)

Cited by 7 publications

References 0 publications

The zoogeographical distribution of Chironomidae (Insecta : Diptera)

The zoogeographical distribution of Chironomidae (Insecta : Diptera)

Population ecology of the marine insect Halocladius variabilis (Diptera: Chironomidae) in the rocky intertidal zone of Nova Scotia, Canada

Numerical, phenetic, and cladistic analyses: Problems and examples with Orthocladiinae (Diptera, Chironomidae)

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