A Key to the New World Genera of Libellulidae1 (Odonata)

Borror, Donald J

doi:10.1093/aesa/38.2.168

Cited by 32 publications

(19 citation statements)

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“…For taxonomic identification, we used specialized keys (Borror ; Belle , ; Garrison ; Lencioni , ; Garrison et al . , ) and compared museum specimens with collection vouchers.…”

Section: Methodsmentioning

confidence: 99%

Neotropical dragonflies (Insecta: Odonata) as indicators of ecological condition of small streams in the eastern Amazon

et al. 2015

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Sensitive and cost-effective indicators of aquatic ecosystem condition in Amazon streams are necessary to assess the effects of anthropogenic disturbances on those systems in a viable and ecologically meaningful manner. We conducted the present study in the municipality of Paragominas, state of Pará, northern Brazil, where we sampled adult dragonflies in 50 100-m-long wadeable stream sites in 2011. We collected 1769 specimens represented by 11 families, 41 genera and 97 species. The suborder Zygoptera contributed 961 individuals and Anisoptera 808. Among the 97 recorded species, nine were classified as useful indicators of ecological condition, with four species being associated with more degraded streams (three Anisoptera, one Zygoptera) and five with more preserved streams (all were Zygoptera). Anisoptera (dragonflies) tend to provide more useful indicators of more degraded environments because they have more efficient homeostatic mechanisms and are more mobile, enabling them to tolerate a wider range of environmental conditions. By contrast, Zygoptera (damselflies) tend to provide a more useful role as indicators of more preserved environments and high levels of environmental heterogeneity because of their smaller body sizes and home ranges and greater ecophysiological restrictions. We conclude from our assessment of this low-order Amazonian stream system that (i) the occurrence of specific odonate species is strongly associated with the configuration of riparian vegetation, (ii) agricultural activities appear to be the main factor determining changes in the composition of odonate assemblages and (iii) these insects can act as useful indicators of the ecological consequences of riparian habitat loss and disturbance. Because generalist species invade moderately degraded areas, those areas may have high species richness but host few species of Zygoptera. Therefore, preserving dense riparian vegetation is necessary to maintain aquatic ecological condition, and that condition can be rehabilitated by planting new trees. Both require enforcing existing environmental regulations, various types of incentives and educating local communities.

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“…For taxonomic identification, we used specialized keys (Borror ; Belle , ; Garrison ; Lencioni , ; Garrison et al . , ) and compared museum specimens with collection vouchers.…”

Section: Methodsmentioning

confidence: 99%

Neotropical dragonflies (Insecta: Odonata) as indicators of ecological condition of small streams in the eastern Amazon

et al. 2015

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“…Sampling was based on the scanning method with fixed areas (De Marco Junior, 1998), already used in other studies (Reis et al, 2011;Juen and De Marco Junior, 2011;Silva-Pinto et al, 2012). For the identification of collected specimens at species level, systematic keys were used (Borror, 1945;Costa et al, 2002;Garrison et al, 2006;Heckman, 2006Heckman, , 2008Lencioni, 2006).…”

Section: Community Descriptionmentioning

confidence: 99%

Effects of marginal vegetation removal on Odonata communities

et al. 2013

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Aim: Here we assess the effects of habitat degradation on individuals of the two suborders of Odonata community of Borecaia river sub-basin. More specifically, we tested the hypothesis that Anisoptera richness would be positively affected by removal of vegetation; on the other hand, Zygoptera richness would be adversely affected by virtue of their ecophysiological requirements; Methods: We selected 10 streams of similar orders, six preserved and four degraded. Streams characterized as preserved had values of Index of Habitat Integrity (HII) above 0.70 (0.77 ± 0.07, mean ± SD) and continuous forest on both sides with a minimum width of 70 meters. Each site was sampled three times on different days. The effect of vegetation removal on richness was assessed using richness estimated by first order Jackknife; Results: Decreased physical integrity (measured with IIH) of streams had no significant effect on the estimated richness to Odonata in general. However, the estimated richness of Anisoptera showed an inverse relationship with the integrity (r 2 = 0.485, P = 0.025), i.e., there was a reduction in their species richness with increasing integrity; Discussion: As a general pattern, Anisoptera presents higher richness in an altered site; on the other hand, Zygoptera presents higher richness in a preserved one. This pattern suggests that Odonata needs to be considered at the sub-order level to access the effects of habitat degradation on these insects. Because of its restrictions ecophysiological Odonata varied widely in their composition and species richness between the two types of environments, it reinforces the potential of the order of studies and environmental monitoring also shows that Zygoptera be more affected by changes in habitat. However, further studies including more samples and different streams are need to confirm this pattern, being an interesting line of research for future works.Keywords: environmental integrity, Anisoptera, Zygoptera, species richness, environmental changes. Resumo: Objetivos:Com o intuito de avaliar os efeitos de mudanças na integridade ambiental sobre os indivíduos da comunidade de Odonata da sub-bacia do rio Borecaia, testamos a hipótese de que a riqueza de Anisoptera seria afetada positivamente pela remoção da vegetação; por outro lado, a riqueza Zygoptera seria prejudicada em virtude de suas necessidades ecofisiológicas; Métodos: Selecionamos 10 riachos de ordens similares, seis classificados como preservados e quatro como alterados. Riachos classificados como preservados apresentaram valores do Índice valores de Integridade Habitat (HII) acima de 0.70 e mata continua nas duas margens com uma largura mínima de 70 metros. Cada ponto foi amostrado três vezes em dias diferentes. O efeito de remoção de vegetação sobre a riqueza foi avaliada utilizando Jackknife de primeira ordem; Resultados: A diminuição da integridade física (mensurada com o IIH) dos córregos não exerceu efeito significativo sobre a riqueza estimada para a Ordem Odonata. Porém, a riqueza estimada de Ani...

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“…Although morphologically and behaviorally similar to Libellula, the genus Orthemis differs from Libellula in characters of wing venation arrangement (Kirby, 1887;Borror, 1945;Needham and Westfall, 1955;Dunkle, 1989). Given the indecisiveness of the molecular data about an ingroup vs an outgroup position for O. ferruginea with respect to Libellula, we suggest that the weight of the evidence (supplied by the morphological data) favors the current null hypothesis of Libellula monophyly and a corresponding outgroup position for O. ferruginea (e.g., Fig.…”

Section: Monophyly Of Libellulamentioning

confidence: 99%

“…Needham (1897) assigned these taxa full generic status, and this interpretation has been widely adopted since (Needham and Westfall, 1955;Carle, 1978;May, 1992;Schmidt, 1987;Westfall and Tennennsen, 1996;Steinmann, 1997). Several other authors, however, have suggested that these two groups be assigned subgeneric status (Kennedy 1922a,b;Borror, 1945;Bennefield, 1965;Walker and Corbet, 1975;Allen et al, 1985;Tsuda, 1986). Still other authors have concluded that Ladona and Plathemis do not deserve even subgeneric status and have synonymized them under Libellula s.l.…”

Section: Status Of Libellula Ladona and Plathemismentioning

confidence: 99%