Chemical Ecology and Biochemistry of Dytiscidae

Dettner, Konrad

doi:10.1007/978-3-031-01245-7_6

Cited by 3 publications

(6 citation statements)

References 193 publications

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“…Additionally, and in line with Dettner, Hübner & Classen (1986), the fresh weights also positively correlated with the lengths of "b+c" (Fig. 2A, see also Fig.…”

Section: Uliginosus-groupsupporting

confidence: 77%

“…As demonstrated by Classen and Dettner (1983) and Dettner, Hübner & Classen (1986), age structures within dytiscid populations can exhibit significant fluctuations from month to month, over the course of one or several years, although the exact lifespan of many Dytiscid species, including A. uliginosus, remains unclear. In species such as Agabus bipustulatus (Linnaeus, 1767), A. paludosus (Fabricius, 1801), or Platambus maculatus (Linnaeus, 1758), populations typically consist of varying numbers of individuals across different age classes at any given time, and these proportions are constantly changing.…”

Section: Biology and Population Structure Of A Uliginosusmentioning

confidence: 99%

“…In insects, particularly adephagous beetles, it is well-established that internal reproductive organs develop gradually and significantly increase in size with age, as progressing from immature to teneral adults and eventually to fully sclerotized, old individuals. Various age classes were consequently described for both females and males (Dettner, Hübner & Classen, 1986). While degeneration of internal genitalia in elder beetles typically occurs post-reproduction, instances of genital reactivation have been observed in beetles living for extended periods, sometimes several years (Blunck, 1912).…”

Section: Introductionmentioning

confidence: 99%

“…While degeneration of internal genitalia in elder beetles typically occurs post-reproduction, instances of genital reactivation have been observed in beetles living for extended periods, sometimes several years (Blunck, 1912). Fresh weights, though subject to fluctuations due to varying food intake, can serve as an approximate indicator of age, owing to the gradual increase in biomass of ectadenies (=accessory glands), testes, and ducti ejaculatori in males, and ovaries, eggs, oviducts, and vagina in females (Dettner, Hübner & Classen, 1986).…”

Section: Introductionmentioning

confidence: 99%

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Age-dependent variation of aedeagal morphology inAgabus uliginosusand the status ofA. lotti(Coleoptera, Dytiscidae)

Dettner,

Kovács,

Rewicz

et al. 2024

Preprint

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The taxonomic status of Agabus lotti within the Agabus uliginosus species group has been a subject of debate due to morphological similarities and lack of molecular data. In this study, we conducted a comprehensive morphological and molecular analysis of specimens from Central Europe, focusing on the Hungarian population. Morphological comparisons of genital structures revealed age-dependent variations, suggesting a gradual transition from A. lotti to A. uliginosus. Molecular analysis of COI sequences further supported this hypothesis, showing minimal genetic differences among most specimens, with only one individual exhibiting distinctiveness. Therefore, A. lotti should be regarded as a junior synonym of A. uliginosus. Our findings also highlight the need for additional multi-marker studies covering a broader geographic range and including both molecular and morphological approaches to elucidate the taxonomic and phylogenetic relationships within this species group. The inclusion of Hungarian samples notably enriched the diversity of haplotypes, emphasizing the importance of expanding sampling efforts in future research.

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“…Additionally, and in line with Dettner, Hübner & Classen (1986), the fresh weights also positively correlated with the lengths of "b+c" (Fig. 2A, see also Fig.…”

Section: Uliginosus-groupsupporting

confidence: 77%

Section: Biology and Population Structure Of A Uliginosusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Age-dependent variation of aedeagal morphology inAgabus uliginosusand the status ofA. lotti(Coleoptera, Dytiscidae)

Dettner,

Kovács,

Rewicz

et al. 2024

Preprint

Self Cite

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“…CM, callow male; CF, callow female; SM, sclerotized male; SF, sclerotized female. and alcohol dehydrogenase is responsible for metabolizing the majority of the ethanol absorbed as part of the diet, and its action may help to quickly eliminate the ethanol from the bark beetle hemolymph (Dettner, 2023). As ethanol is also toxic to pathogens or fungal antagonists of bark beetle nutritional fungal mutualists, thriving on the eatnol-rich host substrate using ADH may give them a selective survival advantage (Lehenberger et al, 2021).…”

Section: Daps Contributed To Beetle Metabolisms Detoxification and De...mentioning

confidence: 99%

Comparative gut proteomics study revealing adaptive physiology of Eurasian spruce bark beetle, Ips typographus (Coleoptera: Scolytinae)

Ashraf,

Mogilicherla,

Sellamuthu

et al. 2023

Front. Plant Sci.

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The bark beetle, Ips typographus (L.), is a major pest of Norway spruce, Picea abies (L.), causing enormous economic losses globally. The adult stage of the I. typographus has a complex life cycle (callow and sclerotized); the callow beetles feed ferociously, whereas sclerotized male beetles are more aggressive and pioneers in establishing new colonies. We conducted a comparative proteomics study to understand male and female digestion and detoxification processes in callow and sclerotized beetles. Proteome profiling was performed using high-throughput liquid chromatography-mass spectrometry. A total of >3000 proteins were identified from the bark beetle gut, and among them, 539 were differentially abundant (fold change ±2, FDR <0.05) between callow and sclerotized beetles. The differentially abundant proteins (DAPs) mainly engage with binding, catalytic activity, anatomical activity, hydrolase activity, metabolic process, and carbohydrate metabolism, and hence may be crucial for growth, digestion, detoxification, and signalling. We validated selected DAPs with RT-qPCR. Gut enzymes such as NADPH-cytochrome P450 reductase (CYC), glutathione S-transferase (GST), and esterase (EST) play a crucial role in the I. typographus for detoxification and digesting of host allelochemicals. We conducted enzyme activity assays with them and observed a positive correlation of CYC and GST activities with the proteomic results, whereas EST activity was not fully correlated. Furthermore, our investigation revealed that callow beetles had an upregulation of proteins associated with juvenile hormone (JH) biosynthesis and chitin metabolism, whereas sclerotized beetles exhibited an upregulation of proteins linked to fatty acid metabolism and the TCA cycle. These distinctive patterns of protein regulation in metabolic and functional processes are specific to each developmental stage, underscoring the adaptive responses of I. typographicus in overcoming conifer defences and facilitating their survival. Taken together, it is the first gut proteomic study comparing males and females of callow and sclerotized I. typographus, shedding light on the adaptive ecology at the molecular level. Furthermore, the information about bark beetle handling of nutritionally limiting and defence-rich spruce phloem diet can be utilized to formulate RNAi-mediated beetle management.

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Dine‐in or take‐away? Scavenging strategies in predaceous diving beetles at different water depths

Wang,

Feng,

Zhao

2024

Entomologia Exp Applicata

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Predaceous diving beetle adults scavenge for carrion in freshwater habitats. We identified two scavenging strategies used by adult Dytiscus sinensis Feng (Coleoptera: Dytiscidae) to locate and consume food at the bottom of water when needing to surface for air store renewal: dine‐in then relocate the food (dine‐in strategy) and carry the food to the surface (take‐away strategy). In 5‐cm‐deep water, a higher proportion of individuals successfully located food within an 8‐min test window than in 25‐cm‐deep water. Their latencies to locating food did not differ among depths. Dytiscus sinensis adults preferred the take‐away strategy in 5‐cm‐deep water and a higher proportion of them adopted the dine‐in strategy in 25‐cm‐deep water. Further, a 10‐cm‐deep test showed that the success rate or efficiency of relocating food did not increase with the experience of locating it the first time. This might explain why D. sinensis preferred the take‐away strategy in shallower water, in which it had lower risks of losing the food. The present study revealed a direct bottom‐up benefit for dytiscids foraging in shallower water where finding and securing food were easier. Our findings demonstrate that the surfacing requirement of dytiscid adults was reflected in foraging strategies with depth‐dependent preferences.

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Chemical Ecology and Biochemistry of Dytiscidae

Cited by 3 publications

References 193 publications

Age-dependent variation of aedeagal morphology inAgabus uliginosusand the status ofA. lotti(Coleoptera, Dytiscidae)

Age-dependent variation of aedeagal morphology inAgabus uliginosusand the status ofA. lotti(Coleoptera, Dytiscidae)

Comparative gut proteomics study revealing adaptive physiology of Eurasian spruce bark beetle, Ips typographus (Coleoptera: Scolytinae)

Dine‐in or take‐away? Scavenging strategies in predaceous diving beetles at different water depths

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