Does carbaryl increase fluctuating asymmetry in damselflies under field conditions? A mesocosm experiment with <i>Xanthocnemis zealandica</i> (Odonata: Zygoptera)

Hardersen, Sönke; Wratten, Stephen D.; Frampton, Chris

doi:10.1046/j.1365-2664.1999.00417.x

Cited by 35 publications

(32 citation statements)

References 42 publications

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“…The results presented support the prediction that specimens of L. cervus collected late in the season are smaller than those collected early, and confirm the well-known fact that those that emerge early are typically larger than those that emerge late (Sweeney & Vannote, 1978;Hardersen et al, 1999;Plaistow et al, 2005). However, average size reached a minimum in week 7 (23.-29.vi.2008) and did not decrease any further as the season progressed.…”

Section: Discussionsupporting

confidence: 86%

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Seasonal constraints on the mandible allometry of Lucanus cervus (Coleoptera: Lucanidae)

Hardersen¹,

Macagno²,

Sacchi³

et al. 2011

Eur. J. Entomol.

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Abstract. In insects, allometries of exaggerated traits such as horns or mandibles are often considered species specific and constant during a season. However, given that constraints imposed by the advancing season affect the developmental processes of organisms, these allometries may not be fixed, and the switch point between morphs may vary between populations and within populations during a season. The hypothesis of such a seasonal variation in exaggerated traits was tested using the dimorphic males of the beetle Lucanus cervus. The remains of specimens killed by predators were collected along forest tracks from mid May to late August 2008 in a protected lowland forest in northern Italy. The largest beetles were collected in mid May and average size thereafter decreased. Males collected early in the season mostly had large mandibles (i.e. they belonged to the major morph). In contrast, late in the season the probability of finding males with large mandibles was very low. The threshold body size determining morph expression also shifted during the season. Early in the season, the threshold pronotum width for a 50% chance of developing into the major morph was 1.74 cm, whereas later in the season it was 1.90 cm. This shift in the threshold body size was interpreted as the effect of phenotypic plasticity in a population exposed to constraints imposed by the advancing season.

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Section: Discussionsupporting

confidence: 86%

“…Moreover, larval mortality is an additional cost of delaying metamorphosis and reproduction. These factors are thought to explain why early emergers are typically larger than late ones (Sweeney & Vannote, 1978;Hardersen et al, 1999;Plaistow et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Seasonal constraints on the mandible allometry of Lucanus cervus (Coleoptera: Lucanidae)

Hardersen¹,

Macagno²,

Sacchi³

et al. 2011

Eur. J. Entomol.

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“…However, Moller (1997) extended it to include selection against developmentally unstable offspring. Field conditions are usually harsh and organisms are exposed to a multitude of stresses such as competition, parasites, pathogens, predators, physico-chemical condi tions, temperature fluctuations and so forth (Hardersen et al, 1999). Selective pressures remove less fit individuals from populations.…”

Section: Discussionmentioning

confidence: 99%

Effects of temperature and genetic stress on life history and fluctuating wing asymmetry in Culex pipiens mosquitoes

Mpho¹,

Callaghan²,

Holloway³

2002

Eur. J. Entomol.

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Abstract. Fluctuating asymmetry (FA) of bilaterally symmetrical organisms has been introduced as a promising indicator of envi ronmental stress. Stress factors reported to contribute to developmental stability include inbreeding and the presence of resistance genes. In the current study we examined the effect of stress derived from high developmental temperatures, resistance genes and low genetic variation on life history variables and wing FA in Culexpipiens mosquitoes. Three strains were compared: two inbred labo ratory strains sharing a similar genetic background but differing in that one strain contained organophosphate (OP) resistance genes, and a third strain that was an outbred OP resistant field strain recently collected from India. There were no strong and general trends that suggested that the OP resistant lab strain was less fit than the OP susceptible strain, although there were some specific among strain differences for some treatments. Fluctuating asymmetry (FA) of wing traits was higher in the laboratory strains than the field strain, suggesting that inbreeding may cause elevated FA in the study species. There was no evidence that the resistance genes were associated with increased wing FA. Wing FA increased with increasing developmental temperature in females, but the association was less strong in males. There was a significant difference between the sexes in this respect. The results are discussed with refer ence to the value ofFA as a biomonitor of environmental stress.

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“…2A), suggesting a prevalence of fieldwork, although experimental manipulations and laboratory trials occur regularly in odonate-based biocontrol and ecotoxicology (e.g., Hardersen et al 1999, Singh et al 2003. The growing number of modeling and simulation efforts, although a small fraction overall ( Fig.…”

Section: Resultsmentioning

confidence: 99%

A review of odonatology in freshwater applied ecology and conservation science

Bried

Samways

2015

Freshwater Science

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The academic study of dragonflies and damselflies (odonatology) is well established, but relatively limited attention has been given to odonates in the context of applied ecology and conservation science. We used the Web of Science ™ and Odonatological Abstract Service (ISSN 1438-0269) to capture trends in primary literature, characterize study features (habitats, life stages, etc.), identify research themes, and suggest future directions for odonatology in freshwater applied ecology and conservation science. We found no papers in this area prior to 1980, and 411 papers from 1980 through 2013. Nearly 75% of these papers were recent (since 2005) and >40% were very recent (since 2010). We identified several broad and overlapping research themes: 1) model taxa, 2) tools and indicators, 3) odonate-centered work, and 4) methodological issues and improvements (field sampling, data modeling/simulation, conservation/landscape-scale genetics). We found more reliance on fieldbased observational approaches than experiments and model-driven exercises, although the number of papers using model-driven exercises is rapidly increasing. We found a strong focus on adult stages, odonate assemblages, the Odonata as a whole, and studies of particular species. We identified research priorities in areas such as ecological valuation and management, monitoring and assessment, climate change and landscape planning, concordance with other taxa, effects of urbanization, data modeling/simulation, and rare-species ecology and conservation. To help establish an identity and facilitate communication, we suggest naming this diverse realm "applied odonatology". We think applied odonatology has a good future for a range of topics from conservation genetics and population ecology to assessments of anthropogenic impacts and the conservation of biodiversity. Key words: dragonflies, assessment, climate change, monitoring, landscape planning, freshwater health, biodiversity conservationThe academic study of dragonflies and damselflies (odonatology) is well established. However, relatively few odonatologists work outside of taxonomy and systematics, behavioral ecology, evolutionary ecology, and other prominent areas of classical research. The major books (Corbet 1999, Córdoba-Aguilar 2008), treatises (e.g., Corbet 1980, Stoks and Córdoba-Aguilar 2012), and flagship journals of odonatology reveal a productive legacy, but also relatively limited attention to matters of applied ecology and conservation science. For example, <5% of the 275 papers published during [2009][2010][2011][2012][2013] in Odonatologica and the International Journal of Odonatology are clearly relevant to applied ecology or conservation science. Nevertheless, the relatively few odonatologists working in this area and researchers based in other fields who often or sometimes use odonates as principal study subjects are making important contributions.A growing body of dragonfly-related research deals with the study or use of odonates in the context of freshwater applied ecolo...

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Does carbaryl increase fluctuating asymmetry in damselflies under field conditions? A mesocosm experiment with Xanthocnemis zealandica (Odonata: Zygoptera)

Cited by 35 publications

References 42 publications

Seasonal constraints on the mandible allometry of Lucanus cervus (Coleoptera: Lucanidae)

Seasonal constraints on the mandible allometry of Lucanus cervus (Coleoptera: Lucanidae)

Effects of temperature and genetic stress on life history and fluctuating wing asymmetry in Culex pipiens mosquitoes

A review of odonatology in freshwater applied ecology and conservation science

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