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33 results for “Ischnura”
FIGURE 2 in Ischnura elegans malikovae subspecies nova (Odonata, Coenagrionidae) from the Far East of Eurasia, with discussion of other possible subspecies
FIGURE 2. Morphological details of the holotype male, of Ischnura elegans malikovae: a—head and thorax, lateral view; b— head, frontal view; c—end of abdomen, lateral view; d—prothorax, lateral view; e—prothorax, dorsal view. Scale bar 1 mm.
FIGURE 1 in Ischnura elegans malikovae subspecies nova (Odonata, Coenagrionidae) from the Far East of Eurasia, with discussion of other possible subspecies
FIGURE 1. Ischnura elegans malikovae. in nature: a—in copula (the holotype male and paratype female) in the type locality, the reservoir in Luchegorsk Town, Primorskiy Kray, Russia; b–c—males at the pond in Korfovskiy settlement, Khabarovskiy Kray, Russia.
FIGURE 4 in Ischnura elegans malikovae subspecies nova (Odonata, Coenagrionidae) from the Far East of Eurasia, with discussion of other possible subspecies
FIGURE 4. Morphological details of the smaller female paratype of Ischnura elegans malikovae: a—head and thorax, lateral view; b—head (dorsal view) and prothorax (lateral view); c—end of abdomen, lateral view; d—prothorax, anteriodorsal view. Scale bar 1 mm.
Data from: Signatures of local adaptation along environmental gradients in a range-expanding damselfly (Ischnura elegans)
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Data from: A molecular phylogeny of forktail damselflies (genus Ischnura) reveals a dynamic macroevolutionary history of female colour polymorphisms
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Data from: Environmental levels of neonicotinoids reduce prey consumption, mobility and emergence of the damselfly Ischnura elegans
Freshwaters are among the most endangered ecosystems in the world as a result of anthropogenic interference such as pollution. Pollution in the form of neonicotinoids has been intensively studied, but data thus far is often conflicted by contrasting responses between laboratory and field experiments. In addition, toxicity data are scarce and contradictory for insects such as Odonates (dragonflies and damselflies) and a potential risk to them may therefore be overlooked. We investigate the potential risk of neonicotinoids to Odonates by exposing nymphs of the blue‐tailed damselfly Ischnura elegans to environmentally relevant concentrations of the neonicotinoid thiacloprid. We consider I. elegans as an indicator species for other Odonates as it is an abundant, widespread and eurytopic species. We analyse the effects of thiacloprid on multiple endpoints (survival, consumption, growth, molting, mobility and emergence), using cage‐experiments as well as controlled field observations in naturally colonized experimental ditches. In addition, we assess sensitivity by either feeding the damselfly nymphs with lab‐cultured prey or by letting them feed freely on natural aquatic invertebrates. All sublethal endpoints of I. elegans are affected to some degree, and strongly depend on the food offered; free‐feeding nymphs are more sensitive than culture‐fed nymphs. Environmental relevant concentrations of thiacloprid strongly reduce the emergence of I. elegans and this effect is more substantial in the natural populations compared to the caged damselflies. This is likely explained by exclusion of additional biotic pressures such as predation in the caged experiment. Policy implications. Literature reports that one out of seven Odonates is threatened and 24% of the species have declining populations. Our observations show that current risks of neonicotinoids to Odonates are underestimated in laboratory experiments as the toxicity is governed by multiple biotic factors such as food quantity/quality and predation. Given the widespread abundance of blue‐tailed damselfly Ischnura elegans, the observed sensitivity to neonicotinoids and current population trends of this species, these results indicate neonicotinoids play a central role in the Odonate decline in general.
FIGURE 3 in Ischnura praematura sp. nov. (Odonata: Zygoptera: Coenagrionidae): a species from Yunnan (China) whose females mate in the teneral state
FIGURE 3. Ischnura praematura male head (a: frontal view; b: dorsal view) and hindwing (c).
FIGURE 2 in Ischnura praematura sp. nov. (Odonata: Zygoptera: Coenagrionidae): a species from Yunnan (China) whose females mate in the teneral state
FIGURE 2. Ischnura praematura sp. nov., holotype ♂ (a) and ♀ allotype (b).
Fig. 1 in Short communication First report of underwater oviposition by the island bluetail damselfly, Ischnura genei (Zygoptera, Coenagrionidae)
Fig. 1 - Female Ischnura genei photographed during underwater oviposition (left) and immediately after climbing out of the water (right). / Femmina di Ischnura genei fotografata durante l'ovodeposizione subacquea (a sinistra) e immediatamente dopo essersi arrampicata fuori dall'acqua (a destra).
Data from: Environmental levels of neonicotinoids reduce prey consumption, mobility and emergence of the damselfly Ischnura elegans
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The genomic response to urbanization in the damselfly Ischnura elegans
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FIGURE 10 in Ischnura praematura sp. nov. (Odonata: Zygoptera: Coenagrionidae): a species from Yunnan (China) whose females mate in the teneral state
FIGURE 10. Ischnura praematura mature male (a) and female (b) as seen in the field, nearby Lijiang city. Note the pruinescence in the abdomen and legs of the mature female and the wing hardness in comparison with the females of the following pictures. Tandem (c) and mating (d) observed in the field between a mature male and a teneral female. All photos by I. Sanmartín-Villar.
FIGURE 6 in Ischnura praematura sp. nov. (Odonata: Zygoptera: Coenagrionidae): a species from Yunnan (China) whose females mate in the teneral state
FIGURE 6. Scheme of the pronotum and mesostigmal plates in lateral view of Ischnura praematura (♂ a; ♀ b), I. aurora from China (♂ c; ♀ d), I. rubilio from India (♂ e; ♀ f,), and I. asiatica from China (♂ g; ♀ h). notch: pronotum posterior lobe notch, exp: pronotum posterior lobe expansion, lat: mesostigmal plate lateral protuberance, dor: mesostigmal plate dorsal protuberance.
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