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Goretti, Enzo; Ceccagnoli, Donatella; Porta, Gianandrea La; Giovanni, Maria Vittoria Di

doi:10.1023/a:1012227400613

Cited by 12 publications

(10 citation statements)

References 6 publications

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“…We obtained two replicates of each measurement per pond and month and used the average value, given the homogeneity in the measurements. To measure the concentration of total P in the water column (TP), we collected 330 ml of surface water and subjected it to acid digestion in the laboratory (Golterman 2004).…”

Section: Pond Characteristicsmentioning

confidence: 99%

“…Secondly, we used a method based on morphometric proportions (e.g. Di Giovanni et al 2000;Goretti et al 2001;Velásquez et al 2009;Winterbourn et al 2011). In this method, each of the measured morphometric variables was plotted against head width to obtain discrete groups of points corresponding to individuals of the same instars.…”

Section: Analysis Of Larval Developmentmentioning

confidence: 99%

“…To fully understand odonate life cycles, it is vital to analyse the patterns of larval growth (Hawking and New 1996) and their morphological characteristics (Goretti et al 2001). Larval growth is affected by the environmental conditions of aquatic habitats.…”

Section: Introductionmentioning

confidence: 99%

“…Alternative methods to estimate the number of instars are based on scatter plots with pairs of morphological characteristics; in this approach, discrete groups are identified by comparing these pairwise measurements, allowing the instars to be recognised (Hawking and New 1996;Ferreras-Romero 1997;Schütte et al 1998;Goretti et al 2001;Velásquez et al 2009). For the Odonata, this method is most effective when the correlated characteristics exhibit allometric growth (Goretti et al 2001).…”

Section: Introductionmentioning

confidence: 99%

“…For the Odonata, this method is most effective when the correlated characteristics exhibit allometric growth (Goretti et al 2001).…”

Section: Introductionmentioning

confidence: 99%

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Larval development and growth ratios of Odonata of the Azores

et al. 2016

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To fully understand odonate life cycles, it is vital to analyse the patterns of larval growth, which are tightly associated with variations in environmental factors. However, the identification of larval instars is often difficult, especially for early development stages. We hypothesise that pond hydroperiod influences odonate larval growth, and test this idea with novel information about the environmental characteristics of 12 study ponds in Terceira Island (Azores). This study, which represents the first analysis of larval development of Odonata in the Azores, involved determining the instars of development and growth ratios. We measured the morphological characteristics of 898 Odonata larvae, and found that they significantly differed between temporary and permanent ponds. To estimate the larval instars, we used two methods: frequency distribution methods and correlation diagrams between body characteristics. The first method was the most effective, allowing the estimation of 17 instars for Anax imperator, 13 for Sympetrum fonscolombii and 10 for Ischnura hastata, as well as growth ratios between instars for head width, total length, abdomen length, wings and antenna length. Our results also suggest that a combination of the two methods is the most appropriate strategy for estimating the number of instars and growth ratios during larval development.

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Section: Pond Characteristicsmentioning

confidence: 99%