Effects of Temperature, Food Quantity, and Nymphal Rearing Density on Life-History Traits of a Northern Population of Hexagenia (Ephemeroptera:Ephemeridae)

Giberson, Donna; Rosenberg, David M.

doi:10.2307/1467384

Cited by 60 publications

(50 citation statements)

References 24 publications

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“…Insects in alpine streams must be able to grow and develop at temperatures that are lower than the minimum of most temperate aquatic insects (which usually are between 4 and 8°C (Gibberson and Rosenberg 1992;Newbold et al 1994). Obviously, some Diamesa species are able to grow and successfully complete an entire life cycle at 0-2°C (Milner and Petts 1994).…”

Section: Introductionmentioning

confidence: 99%

Longitudinal and seasonal pattern of insect emergence in alpine streams

Füreder

Wallinger²,

Burger³

2005

Aquat Ecol

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Prevailing water sources and/or regional climate are known to have an important influence on hydromorphology and chemistry of high alpine streams, affecting biology and phenology of aquatic insects considerably. Seven reaches in two different stream types (glacial and non-glacial) in the European Central Alps were investigated along a longitudinal gradient above the tree line to elucidate community structure and emergence patterns of aquatic insects. Aquatic insect emergence was dominated by chironomid taxa in both streams (95.0% in the glacial vs. 90.5% in the spring-fed stream). Emergence rate was much higher in the non-glacial stream, with Chironomidae 638.9 ind. m À2 d À1 and EPT (Ephemeroptera, Plecoptera, Trichoptera) 20.3 ind. m À2 d À1 (annual mean), compared to the glacial stream (Chironomidae 132 ind. m À2 d À1 and EPT 7.0 ind. m À2 d À1 ). Whereas, in the glacial stream a richer and more diverse species composition was found at lower elevations, emergence rate and emerging taxa numbers were higher at higher altitude in the non-glacial stream. Seasonal comparisons also showed a significant difference between the two streams. In the glacial stream maximum emergence was in April/May, whereas, in the nonglacial stream in July. A comparison with similar studies carried out in alpine streams showed that abundance and biomass of emerging insects were relatively low in the glacial stream. The continuous emergence throughout the summer is another example of insect life-cycle adaptation to the harsh environmental conditions in glacial streams: most likely, emergence during the warmer summer months, where the probability of experiencing favourable climate conditions on land is higher than for the rest of the year, was an evolutionary advantage for many glacial stream taxa.

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Section: Introductionmentioning

confidence: 99%

Longitudinal and seasonal pattern of insect emergence in alpine streams

Füreder

Wallinger²,

Burger³

2005

Aquat Ecol

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“…GIBERSON and ROSENBERG (1992) found that, in a Hexagenia (Ephemeroptera) larval population, there was no significant difference in larval growth rates among density treatments when competition for food did not occur. In addition, BANKS and THOMPSON (1987) noted that in damselfly Coenagrion populations, larvae in the high-density population, having reduced feeding rates, were more likely to be semivoltine, while in the low density population they were uni-voltine.…”

Section: Environmental Factorsmentioning

confidence: 95%

Effect of Larval Density on Temporal Variation in Life Cycle Patterns of Chironomus plumosus(L.)(Diptera: Chironomidae) in the Profundal Zone of Eutrophic Lake Suwa during 1982-1995.

亮治¹,

公男²

1998

Jpn. J. Limnol.

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“…If resources are severely limited growth will be at the maximum allowed by the resources, and there can be no trade-off involving time or size. For example, limited food resources usually determine final size directly (Giberson & Rosenberg, 1992a;Tammaru, 1998); adopting a longer season in order to grow bigger instead is not necessarily an option. Undersized blowfly larvae develop directly; resource-dependent diapause is not an option (Saunders, 1997).…”

Section: Trade-offs and Coordinationmentioning

confidence: 99%

The range of insect dormancy responses

Danks¹

2002

Eur. J. Entomol.

103

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Abstract. Insect dormancy responses, in the broad sense of modifications of development, are examined from a general perspective. The range of responses is extraordinarily wide because environments are diverse, different taxa have different evolutionary histories, adaptations are needed for both seasonal timing and resistance to adversity, and not only development but also many other aspects of the life-cycle must be coordinated. Developmental options are illustrated by examining the wide range of ways in which develop ment can be modified, the fact that each individual response consists of several components, and the different potential durations of the life-cycle. The concepts of alternative life-cycle pathways (chosen according to current and likely future environmental condi tions) and of active and passive default responses are treated. Also introduced are aspects of variation and trade-offs.Some general conclusions that help in understanding dormancy responses emerge from such an examination. Many options are available (cf. Table 1). The nature of the habitat, especially its predictability, determines the potential effectiveness of many of the developmental options. Any particular set of responses reflects evolutionary history and hence depends on past as well as current environments. It is not necessarily obvious what kinds of selection, especially requirements for timing versus resistance to adversity, explain a particular life cycle. Life-cycle pathways have multiple components, so that components cannot be analyzed in isolation. A given feature, such as delayed development, can have multiple roles. Default responses can be either active (development continues unless signalled otherwise) or passive (development stops unless signalled otherwise), making necessary a broad approach to under standing the action of environmental cues. Even relatively minor effects that fine-tune dormancy responses enhance survival, but may be difficult to detect or measure. Trade-offs are not inevitable, not only when certain resources are surplus, but also because resources in very short supply (constraints) cannot be traded off. Life-cycle components are widely, but not universally, coordinated. These conclusions confirm that the range of dormancy responses is wider, more complex and more integrated than has often been recognized.

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Effects of Temperature, Food Quantity, and Nymphal Rearing Density on Life-History Traits of a Northern Population of Hexagenia (Ephemeroptera:Ephemeridae)

Cited by 60 publications

References 24 publications

Longitudinal and seasonal pattern of insect emergence in alpine streams

Longitudinal and seasonal pattern of insect emergence in alpine streams

Effect of Larval Density on Temporal Variation in Life Cycle Patterns of Chironomus plumosus(L.)(Diptera: Chironomidae) in the Profundal Zone of Eutrophic Lake Suwa during 1982-1995.

The range of insect dormancy responses

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