Sampling and comparing odonate assemblages by means of exuviae: statistical and methodological aspects

Hardersen, Sönke; Corezzola, Serena; Gheza, Gabriele; Dell'Otto, Alessandro; Porta, Gianandrea La

doi:10.1007/s10841-017-9969-z

Cited by 15 publications

(10 citation statements)

References 42 publications

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“… , b, Hardersen et al. ), and it has been shown that even small samples could produce a fairly reliable species list for any given site, given that the sampling is repeated (Bried et al. ).…”

Section: Methodsmentioning

confidence: 99%

Regional variations in occupancy frequency distribution patterns between odonate assemblages in Fennoscandia

Korkeamäki¹,

Elo

Sahlén

et al. 2018

Ecosphere

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Abstract. Odonate (damselfly and dragonfly) species richness and species occupancy frequency distributions (SOFDs) were analyzed in relation to geographical location in standing waters (lakes and ponds) in Fennoscandia, from southern Sweden to central Finland. In total, 46 dragonfly and damselfly species were recorded from 292 waterbodies. Species richness decreased to the north and increased with waterbody area in central Finland, but not in southern Finland or in Sweden. Species occupancy ranged from 1 up to 209 lakes and ponds. Over 50% of the species occurred in <10% of the waterbodies, although this proportion decreased to the north. In the southern lakes and ponds, none of the species occurred in all lakes, whereas in the north, many species were present in all of the studied waterbodies. The dispersal ability of the species did not explain the observed species occupancy frequencies, but generalist species with a large geographical range occurred in a higher percentage of the waterbodies. At Fennoscandia scale, we found that the unimodal satellite pattern was predominant. However, at smaller scale, we found geographical variations in odonate species SOFD patterns. The most southern communities followed the unimodal satellite-dominant pattern, whereas in other regions, communities fitted best with the bimodal core-satellite patterns. It seems that the richer species pool in the southern locations, and the larger distribution range of the northern species, skewed the unimodal pattern into a bimodal satellite-dominant pattern.

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Section: Methodsmentioning

confidence: 99%

Regional variations in occupancy frequency distribution patterns between odonate assemblages in Fennoscandia

Korkeamäki¹,

Elo

Sahlén

et al. 2018

Ecosphere

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“…Collections of exuviae on shore, and the collections of larvae with various types of actively deployed nets, are likely to be more productive and time-efficient than collections made with drift nets in most circumstances. However, despite the considerable usefulness of exuviae collections for sampling for gomphids (Corbet, 1999;DuBois, 2015;DuBois & Pratt, 2017;Hardersen, Corezzola, Gheza, Dell'Otto, & La Porta, 2017), exuviae are typically available only for relatively short windows of time. Further, exuviae of coenagrionids are often small, fragile, and challenging to identify.…”

Section: Discussionmentioning

confidence: 99%

Odonata drift: a reassessment

DuBois¹

2020

International Journal of Odonatology

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More than 400 scientific journal articles and gray literature reports that addressed macroinvertebrate drift were reviewed and 63 articles were found that reported on the natural drift of Odonata at some taxonomic level. Forty-three species and 44 genera within 15 families (nine Zygoptera; six Anisoptera) were documented in the drift. Drift of another 13 species and eight genera was inferred from indirect evidence. The mean drift density reported was 0.03 m -3 (range < 0.001-0.153 m -3 ), which is relatively low, but not unexpected because benthic densities of Odonata are often lower than those of the macroinvertebrate taxa that occur more frequently in the drift. Percent composition of odonates in the total drift was invariably < 10% and usually < 1%, but the percent was slightly higher if expressed as biomass or volume because odonate larvae are relatively large. Most odonates that drifted were not full grown. High flows were often associated with drift of Odonata, but not exclusively so; drift was highest at night and during summer months. Accidental (catastrophic) drift and active, behavioral drift to colonize new habitats and reduce crowding are thought to be the primary causes of Odonata drift, but its ecological significance would benefit from more research. The presumption that Odonata have a low predisposition to drift is probably not uniformly accurate. Use of drift nets specifically to collect odonates is unlikely to be as efficient as other collection methods in most circumstances, but it should not be entirely dismissed because drift nets are easy to set, relatively clean to operate, do not destroy habitats, and provide integrated samples of various habitats where it might be difficult or unsafe to use other methods.

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“…Over half of the spatial variation in both abundance and richness was a function of waterbody, rather than site or location, although this was much stronger in dragonflies than damselflies; abundance of the latter appeared equally distributed between sites, waterbodies and locations. In the context of previous studies of odonates, where there is an ongoing debate over the value of sampling adults compared to exuviae or larvae (Raebel et al 2010;Giuglioano et al 2012;Golfieri et al 2017;Hardersen et al 2017), these results demonstrate that significant variation in odonate abundance and richness occurs at the level of waterbodies, particularly for dragonflies, supporting the inference of Kietzka et al (2017). Thus, adult counts can provide useful information about the quality of those individual waterbodies, although precisely how that measure of quality relates to aspects of odonate biology, such as the ability of species to reproduce successfully, remains unclear (Raebel et al 2010, although see Bried et al 2015;Pattern et al 2019), and more intensive methods may be required for particular species.…”

Section: Discussionmentioning

confidence: 99%

“…Giuglioano et al 2012;Berquier et al 2016;Simaika et al 2016). Given their mobility, some have suggested that adults do not necessarily signal that viable populations may be supported at a site, leading to recommendations that the sampling of exuviae is the most effective method for surveying odonates (Raebel et al 2010;Hardersen et al 2017). However, the low detectability of exuviae and the risk of under-estimation of occurrence, has led others to favour the sampling of adults (Bried et al 2012;Giuglioano et al 2012), counts of which have been shown to correlate with exuviae and teneral occurrence, two indicators of locally successful completion of the life-cycle (Bried et al 2015;Pattern et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Do surveys of adult dragonflies and damselflies yield repeatable data? Variation in monthly counts of abundance and species richness

Pearce‐Higgins

Chandler²

2020

J Insect Conserv

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There is considerable debate over the most appropriate method for surveying dragonflies and damselflies (odonates). Using data from 62 survey locations nested within 26 waterbodies at 15 sites (discrete parcels of common ownership) in West Suffolk, UK, we show that short (20 m line transects or 3 min duration point counts), monthly counts of adults are repeatable. Correlations between predictions from models accounting for variation in ambient conditions and time of day and 52 separate counts used for validation equalled r = 0.87 for total abundance and r = 0.75 for species richness. Correlation coefficients between observed and modelled abundance exceeded 0.5 for eight of fourteen species modelled individually. Ambient temperature was the most important weather variable that influenced survey results, affecting the abundance of nine species, total abundance and species' richness. Most of the spatial variation in survey results was between waterbodies, rather than between sites or at individual survey locations, suggesting that adult counts may indicate aspects of waterbody quality, although differences in these patterns were observed between dragonflies (Anisoptera) and damselflies (Zygoptera). Encouraging relatively infrequent and rapid counts of flying adults may therefore be used to increase volunteer participation in citizen (community) science odonate monitoring schemes whilst also providing repeatable abundance and species richness data that can contribute to research and monitoring programmes.

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Sampling and comparing odonate assemblages by means of exuviae: statistical and methodological aspects

Cited by 15 publications

References 42 publications

Regional variations in occupancy frequency distribution patterns between odonate assemblages in Fennoscandia

Regional variations in occupancy frequency distribution patterns between odonate assemblages in Fennoscandia

Odonata drift: a reassessment

Do surveys of adult dragonflies and damselflies yield repeatable data? Variation in monthly counts of abundance and species richness

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