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  1. Article ; Online: Pollinating fig wasps’ simple solutions to complex sex ratio problems

    Jaco M. Greeff / Finn Kjellberg

    Frontiers in Zoology, Vol 19, Iss 1, Pp 1-

    a review

    2022  Volume 23

    Abstract: Abstract Local mate competition (LMC) favours female biased clutch sex ratios because it reduces competition between brothers and provides extra mating opportunities for sons. Fig wasps seem to fit LMC model assumptions and lay female-biased sex ratios ... ...

    Abstract Abstract Local mate competition (LMC) favours female biased clutch sex ratios because it reduces competition between brothers and provides extra mating opportunities for sons. Fig wasps seem to fit LMC model assumptions and lay female-biased sex ratios as predicted. These female biased sex ratios increase fitness greatly. In line with predictions, their sex ratios become less female-biased as the number of mothers laying in the same fig increases. However, this variation results in comparatively small fitness benefits compared to just biased ratios and data suggest substantial mismatches with LMC theory. The mismatches are due to several factors. (1) Multiple foundresses typically lay too many daughters. (2) Single foundress sex ratios are explained by sequential oviposition and ladies-last models. (3) Mortality that typically exceeds 10% may decouple the link between primary sex ratios, the focus of model predictions, and secondary sex ratios of adult wasps that are counted by researchers. (4) Model assumptions are frequently violated: (a) clutch sizes are unequal, (b) oviposition may not be simultaneous (c) cryptic/multiple wasp species inhabit the same host, (d) foundress numbers are systematically undercounted, (e) inbreeding coefficient calculations are inaccurate, and (f) male wasps sometimes disperse. These data and calculations suggest that alternative explanations must be considered seriously. Substantial data show that wasps typically lay most of their male eggs first followed by mostly female eggs require a new approach. These “slope” strategies result in more accurate sex ratios that are automatically adjusted to foundress number, own and relative clutch sizes and to sequential clutches. This effect will alter sex ratios in all species once the egg capacity of a fig is crossed or when interference reduces clutch sizes. In addition to this passive response, the females of about half the studied species have a conditional response that reduces female bias under higher foundress numbers by laying more ...
    Keywords Local mate competition ; Sex allocation ; Adaptation ; Pre-adaptation ; Exaptation ; Mortality ; Zoology ; QL1-991
    Subject code 590
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher BMC
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Overlaps in olfactive signalling coupled with geographic variation may result in localised pollinator sharing between closely related Ficus species

    Xiaoxia Deng / Yufen Cheng / Yan-Qiong Peng / Hui Yu / Magali Proffit / Finn Kjellberg

    BMC Ecology and Evolution, Vol 22, Iss 1, Pp 1-

    2022  Volume 14

    Abstract: Abstract Background In brood site pollination mutualisms, pollinators are attracted by odours emitted at anthesis. In Ficus, odours of receptive figs differ among species and the specific pollinators generally only enter figs of their host species ... ...

    Abstract Abstract Background In brood site pollination mutualisms, pollinators are attracted by odours emitted at anthesis. In Ficus, odours of receptive figs differ among species and the specific pollinators generally only enter figs of their host species ensuring a pre-zygotic barrier to plant interspecific hybridisation. However, field observations recorded that, in Guangdong province in China, Valisia javana hilli, the local pollinator of F. hirta, entered and reproduced successfully in the figs of the closely related F. triloba on a regular basis. We propose that closely related Ficus species produce similar receptive fig odours. Under particular contexts of odours locally present, the receptive fig odours of non-host figs of a Ficus species may become attractive to pollinators of closely related Ficus species. We used the headspace technique to collect in situ receptive fig odours of F. triloba in a series of locations in China. Under controlled conditions, we tested the attraction of fig pollinating wasps from F. hirta and F. triloba to host figs and non-host figs in Y tube experiments. Results Receptive fig odours of F. triloba though different from those of F. hirta, were mainly composed of a same set of volatile organic compounds. When given the choice between receptive fig odours and air, the pollinating wasps were only attracted by their host’s odours. However, when given a choice between host and non-host figs the pollinators of F. hirta were equally attracted by the two odours while the pollinators of F. triloba tended to be more attracted by their host’s fig odours. Conclusions Receptive fig odours vary geographically within species and the differentiation of receptive fig odours between closely related Ficus species is often incomplete. This allows localised or occasional pollinator sharing following different modalities. Cross stimulation when wasps are exposed simultaneously to odours of host and non-host species may be important. While occasional pollinator sharing may play a marginal role when wasp ...
    Keywords Chemical signalling ; Co-speciation ; Ficus hirta ; Ficus triloba ; Mutualism ; Speciation ; Ecology ; QH540-549.5 ; Evolution ; QH359-425
    Subject code 590
    Language English
    Publishing date 2022-08-01T00:00:00Z
    Publisher BMC
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Maintenance of specificity in sympatric host-specific fig/wasp pollination mutualisms

    Hua Xie / Pei Yang / Yan Xia / Finn Kjellberg / Clive T. Darwell / Zong-Bo Li

    PeerJ, Vol 10, p e

    2022  Volume 13897

    Abstract: Background Fig/wasp pollination mutualisms are extreme examples of species-specific plant-insect symbioses, but incomplete specificity occurs, with potentially important evolutionary consequences. Why pollinators enter alternative hosts, and the fates of ...

    Abstract Background Fig/wasp pollination mutualisms are extreme examples of species-specific plant-insect symbioses, but incomplete specificity occurs, with potentially important evolutionary consequences. Why pollinators enter alternative hosts, and the fates of pollinators and the figs they enter, are unknown. Methods We studied the pollinating fig wasp, Ceratosolen emarginatus, which concurrently interacts with its typical host Ficus auriculata and the locally sympatric alternative host F. hainanensis, recording frequencies of the wasp in figs of the alternative hosts. We measured ovipositor lengths of pollinators and style lengths in female and male figs in the two host species. Volatile organic compounds (VOCs) emitted by receptive figs of each species were identified using GC-MS. We tested the attraction of wasps to floral scents in choice experiments, and detected electrophysiologically active compounds by GC-EAD. We introduced C. emarginatus foundresses into figs of both species to reveal the consequences of entry into the alternative host. Results C. emarginatus entered a low proportion of figs of the alternative host, and produced offspring in a small proportion of them. Despite differences in the VOC profiles of the two fig species, they included shared semiochemicals. Although C. emarginatus females prefer receptive figs of F. auriculata, they are also attracted to those of F. hainanensis. C. emarginatus that entered male figs of F. hainanensis produced offspring, as their ovipositors were long enough to reach the bottom of the style; however, broods were larger and offspring smaller than in the typical host. Female figs of F. hainanensis failed to produce seeds when visited by C. emarginatus. These findings advance our current understanding of how these species-specific mutualisms usually remain stable and the conditions that allow their diversification.
    Keywords Species-specificity ; Non-typical host-use ; Volatile organic compounds ; Electrophysiology ; Fig wasps ; Ficus ; Medicine ; R ; Biology (General) ; QH301-705.5
    Subject code 590
    Language English
    Publishing date 2022-08-01T00:00:00Z
    Publisher PeerJ Inc.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article: Constraints on convergence: hydrophobic hind legs allow some male pollinator fig wasps early access to submerged females

    Rodriguez, Lillian J / Finn Kjellberg / Freya Young / Jean-Yves Rasplus / Stephen G. Compton

    Journal of natural history. 2017 Apr. 11, v. 51, no. 13-14

    2017  

    Abstract: Pollinator fig wasps (Hymenoptera: Agaonidae) display numerous adaptations linked to their obligate association with fig trees (Ficus). Ceratosolen fig wasps pollinate figs that often fill temporarily with liquid, and one clade has males with unusually ... ...

    Abstract Pollinator fig wasps (Hymenoptera: Agaonidae) display numerous adaptations linked to their obligate association with fig trees (Ficus). Ceratosolen fig wasps pollinate figs that often fill temporarily with liquid, and one clade has males with unusually long hind legs. We investigated their morphology and behaviour. Scanning electron microscopy (SEM) revealed that the cuticle of their hind legs is highly modified and covered with numerous hydrophobic setae and microtrichia that can prevent blockage of the wasps’ large propodeal spiracles by liquids. In deep liquid, the males floated on the surface, but when only a thin layer of liquid was present, the legs allowed males to access females without the risk of drowning. Access to females was facilitated by an air bubble that forms between the hind legs and maintains a column of air between the spiracles and the centre of the figs. Sexual selection should favour males that can gain earlier access to mates, and the modified legs represent an adaptation to achieve this. Convergent adaptations are known in some unrelated non-pollinating fig wasps that develop in similar liquid-filled figs, but these species have enlarged hydrophobic peritremata at the ends of their metasoma to protect the spiracles located there. Unlike non-pollinating fig wasps, pollinator males need to insert their metasoma deep into females’ galls during mating. This difference in mating behaviour has constrained the extent of convergence.
    Keywords Agaonidae ; air ; females ; Ficus ; figs ; galls ; hydrophobicity ; legs ; males ; mating behavior ; pollinators ; risk ; scanning electron microscopy ; sexual selection ; spiracles ; trees ; wasps
    Language English
    Dates of publication 2017-0411
    Size p. 761-782.
    Publishing place Taylor & Francis
    Document type Article
    ZDB-ID 1467695-3
    ISSN 1464-5262 ; 0022-2933
    ISSN (online) 1464-5262
    ISSN 0022-2933
    DOI 10.1080/00222933.2017.1293746
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: (with research data) First plastid phylogenomic study reveals potential cyto-nuclear discordance in the evolutionary history of Ficus L. (Moraceae)

    Bruun-Lund, Sam / Finn Kjellberg / Nina Rønsted / Wendy L. Clement

    Molecular phylogenetics and evolution. 2017 Apr., v. 109

    2017  

    Abstract: Standard Sanger chloroplast markers provide limited information to resolve species level relationships within plants, in particular within large genera. Figs (Ficus L., Moraceae) compose one of the 50 largest genera of angiosperms with ∼750 species ... ...

    Abstract Standard Sanger chloroplast markers provide limited information to resolve species level relationships within plants, in particular within large genera. Figs (Ficus L., Moraceae) compose one of the 50 largest genera of angiosperms with ∼750 species occurring in the tropics and subtropics worldwide. Figs, in addition to being a keystone food resource in rainforests, are well-known for the mutualistic interactions with their pollinating wasps. It is regarded as a model system for understanding co-evolution dating back more than 75million years. However, despite significant taxon sampling, combinations of low copy nuclear, nuclear ribosomal and chloroplast regions have not been able to confidently resolve relationships among major groups of figs.Using a high throughput sequencing approach we attempted to resolve the major lineages of Ficus based on plastome data. In this study, we show that the use of a de novo assembled plastome from within the genus provides less ambiguity and higher coverage across the 59 Ficus and 6 outgroup plastome assemblies compared to using the nearest available reference plastome outside the genus resulting in improved resolution and higher support of the phylogenetic relationships within Ficus inferred from plastome data.Chloroplast genome data confidently resolved relationships among major groups of figs and largely support current understanding based on nuclear sequence data including passively pollinated Neotropical section Pharmacosycea as sister lineage to all other Ficus. However, conflicts between the new plastome topology and previous nuclear studies are observed for both individual species as well as relationships among some sections at deeper levels. Conflicts could be caused by lack of resolution in the nuclear data or may indicate potential cyto-nuclear discordance as previously observed in an African lineage of Ficus.
    Keywords chloroplasts ; coevolution ; Ficus ; figs ; genome ; high-throughput nucleotide sequencing ; models ; Neotropics ; phylogeny ; pollinating insects ; rain forests ; subtropics ; topology
    Language English
    Dates of publication 2017-04
    Size p. 93-104.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 33610-5
    ISSN 1095-9513 ; 1055-7903
    ISSN (online) 1095-9513
    ISSN 1055-7903
    DOI 10.1016/j.ympev.2016.12.031
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Rush hour at the museum - Diversification patterns provide new clues for the success of figs (Ficus L., Moraceae)

    Bruun-Lund, Sam / Brecht Verstraete / Finn Kjellberg / Nina Rønsted

    Acta oecologica. 2017,

    2017  

    Abstract: Tropical rainforests harbour much of the earth's plant diversity but little is still known about how it evolved and why a small number of plant genera account for the majority. Whether this success is due to rapid turnover or constant evolution for these ...

    Abstract Tropical rainforests harbour much of the earth's plant diversity but little is still known about how it evolved and why a small number of plant genera account for the majority. Whether this success is due to rapid turnover or constant evolution for these hyper-diverse plant genera is here tested for the species-rich genus Ficus L. (figs). The pan-tropical distribution of figs makes it an ideal study group to investigate rainforest hyper-diversification patterns. Using a recently published, dated and comprehensive phylogenetic hypothesis, we infer that figs are an old lineage that gradually accumulated species and exhibits very low extinction rates, which corresponds to the ‘museum model’ of evolution. Overall, no major significant shifts in evolutionary dynamics are detected, yet two shifts with lower probability are found. Hemi-epiphytism, monoecy, and active pollination are traits that possibly are associated with the hyper-diversity found in figs, making it possible for the plants to occupy new niches followed by extensive radiation over evolutionary time scales. Figs possess unique diversification patterns compared to other typical rainforest genera.
    Keywords Ficus ; extinction ; figs ; models ; monoecy ; niches ; phylogeny ; pollination ; probability ; species diversity ; tropical rain forests
    Language English
    Size p. .
    Publishing place Elsevier Masson SAS
    Document type Article
    Note Pre-press version
    ZDB-ID 1033625-4
    ISSN 1146-609X
    ISSN 1146-609X
    DOI 10.1016/j.actao.2017.11.001
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Comparison of the antennal sensilla of females of four fig-wasps associated with Ficus auriculata

    Yang, Pei / Zong-bo Li / Da-rong Yang / Yan-qiong Peng / Finn Kjellberg

    Acta oecologica. 2017,

    2017  

    Abstract: A comparison was performed of the antennal sensilla of females of four chalcid wasp species Ceratosolen emarginatus Mayr, 1906, Sycophaga sp., Philotrypesis longicaudata Mayr, 1906, and Sycoscapter roxburghi Joseph, 1957, which are specific and ... ...

    Abstract A comparison was performed of the antennal sensilla of females of four chalcid wasp species Ceratosolen emarginatus Mayr, 1906, Sycophaga sp., Philotrypesis longicaudata Mayr, 1906, and Sycoscapter roxburghi Joseph, 1957, which are specific and obligatory associated with Ficus auriculata (Lour, 1790). The four species exhibit different oviposition strategies in the fig ovules where their offspring hatch and develop. Antennal sensilla morphology was evaluated using scanning electron microscopy. Females of the four species present 11 morphologically similar types of sensilla: trichoid sensilla, sensilla obscura, chaetica sensilla 1 and 2, which all have mechanosensory functions; uniporous basiconic sensilla, which are presumably contact chemosensilla; basiconic capitate peg sensilla, coeloconic sensilla 1, multiporous basiconic and placoid sensilla, which may be regarded as olfactory sensilla, and coeloconic sensilla 2 and 3, which are presumed to be proprioreceptors or pressure receptors. The four species have significant differences in the abundance and arrangement of trichoid sensilla and chaetica sensilla 1 on the flagellum. The coeloconic sensilla and sensilla obscura only occur on the antennae of C. emarginatus that enter figs. The chemosensilla which are presumably involved in host discrimination, i.e., basiconic sensilla, multiporous placoid sensilla and basiconic capitate peg sensilla, are similar in shape and configuration, although they present some differences in abundance. These findings provide practical information on the adaptations of fig wasps and the relationship between multisensory antennae and functions in fig wasp behaviour.
    Keywords Agaonidae ; Ficus ; antennae ; females ; figs ; flagellum ; oviposition ; ovules ; progeny ; receptors ; scanning electron microscopy ; sensilla ; wasps
    Language English
    Size p. .
    Publishing place Elsevier Masson SAS
    Document type Article
    Note Pre-press version
    ZDB-ID 1033625-4
    ISSN 1146-609X
    ISSN 1146-609X
    DOI 10.1016/j.actao.2017.11.002
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: Daily rhythm of mutualistic pollinator activity and scent emission in Ficus septica

    Lucie Conchou / Léa Cabioch / Lillian J V Rodriguez / Finn Kjellberg

    PLoS ONE, Vol 9, Iss 8, p e

    ecological differentiation between co-occurring pollinators and potential consequences for chemical communication and facilitation of host speciation.

    2014  Volume 103581

    Abstract: The mutualistic interaction between Ficus and their pollinating agaonid wasps constitutes an extreme example of plant-insect co-diversification. Most Ficus species are locally associated with a single specific agaonid wasp species. Specificity is ensured ...

    Abstract The mutualistic interaction between Ficus and their pollinating agaonid wasps constitutes an extreme example of plant-insect co-diversification. Most Ficus species are locally associated with a single specific agaonid wasp species. Specificity is ensured by each fig species emitting a distinctive attractive scent. However, cases of widespread coexistence of two agaonid wasp species on the same Ficus species are documented. Here we document the coexistence of two agaonid wasp species in Ficus septica: one yellow-colored and one black-colored. Our results suggest that their coexistence is facilitated by divergent ecological traits. The black species is longer-lived (a few more hours) and is hence active until later in the afternoon. Some traits of the yellow species must compensate for this advantage for their coexistence to be stable. In addition, we show that the composition of the scent emitted by receptive figs changes between sunrise and noon. The two species may therefore be exposed to somewhat different ranges of receptive fig scent composition and may consequently diverge in the way they perceive and/or respond to scents. Whether such situations may lead to host plant speciation is an open question.
    Keywords Medicine ; R ; Science ; Q
    Subject code 590 ; 580
    Language English
    Publishing date 2014-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article: Diversity of foliar endophytic ascomycetes in the endemic Corsican pine forests

    Taudière, Adrien / Aarón Lecanda / Annick Lesne / Christopher Carcaillet / Finn Kjellberg / Franck Richard / Jean-Michel Bellanger / Karin Scharmann / Laetitia Hugot / Pierre-Arthur Moreau / Sebastian Leidel

    Fungal ecology. 2018 Dec., v. 36

    2018  

    Abstract: Plant leaves host species rich communities of foliar endophytic fungi (FEF). Compared to the other compartments of the plant microbiome, FEF diversity is poorly known. Here we document the communities of FEF associated with the endemic Corsican pine ... ...

    Abstract Plant leaves host species rich communities of foliar endophytic fungi (FEF). Compared to the other compartments of the plant microbiome, FEF diversity is poorly known. Here we document the communities of FEF associated with the endemic Corsican pine Pinus nigra subsp. laricio at three sites across its natural range and examine the effect of forest site, tree age and light exposure on FEF composition. Metabarcoding using next-generation sequencing provided 8,243,608 Ascomycota ITS2 sequences clustered into 642 FEF operational taxonomic units (OTUs). FEF communities did not differ in species richness across sites and tree cohorts, but differed in composition among forest patches and according to tree age. FEF community composition did not correlate with needle location (shade vs full light). Results are robust against the various options of the bioinformatic pipeline specifically developed. This study provides the first picture of FEF diversity in a Mediterranean island and underlines the complementarity of forest massifs for fungal conservation.
    Keywords Ascomycota ; bioinformatics ; community structure ; coniferous forests ; DNA barcoding ; endophytes ; fungi ; high-throughput nucleotide sequencing ; hosts ; internal transcribed spacers ; leaves ; microbiome ; Pinus nigra subsp. laricio ; species richness ; tree age ; trees
    Language English
    Dates of publication 2018-12
    Size p. 128-140.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 1754-5048
    DOI 10.1016/j.funeco.2018.07.008
    Database NAL-Catalogue (AGRICOLA)

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  10. Article: Evidence of genetic influence on the flowering pattern of Ficus microcarpa

    Yang, Hui-Wen / Anthony Bain / Finn Kjellberg / Lien-Siang Chou / Marjorie Garcia

    Acta oecologica. 2014 May, v. 57

    2014  

    Abstract: Flowering patterns result from the interactions between genetic and environmental factors. While the genetic basis for flowering time variation in commercial plants is often well understood, few studies have been conducted to investigate these patterns ... ...

    Abstract Flowering patterns result from the interactions between genetic and environmental factors. While the genetic basis for flowering time variation in commercial plants is often well understood, few studies have been conducted to investigate these patterns in plants without economic importance. Ficus microcarpa is a commonly introduced horticultural fig tree. Asynchrony in syconium development and the initiation, frequency, and size of crops may affect its fitness as well as the success of mutualism with its pollinating wasps. In order to identify genetically determined patterns in the flowering traits in F. microcarpa, a 14-month census was taken on the flowering characteristics of 28 trees growing in close proximity along an urban street in Taipei, Taiwan. Weekly surveys were taken on 7 characteristics: crop number, syconia per branch, crop asynchrony, as well as flowering onset and seed development duration for both the spring and summer crops. Post-census genotyping at microsatellite loci distinguished 16 genetic groups (5 clonal groups and 11 non-clone trees). All crop characteristics presented higher variation across different genotype groups than within groups except for seed development duration. We found no evidence of adjacency effects or spatial auto-correlation of flowering traits. The study offers the first evidence of genetic variations in the flowering patterns in a species of Ficus. These findings lend insight into the adaptive characteristics that potentially facilitate the local establishment of F. microcarpa in new locations.
    Keywords autocorrelation ; crops ; environmental factors ; Ficus microcarpa ; figs ; flowering ; fruits ; genetic variation ; genotype ; genotyping ; horticulture ; microsatellite repeats ; mutualism ; pollinating insects ; seed development ; spring ; summer ; surveys ; temporal variation ; trees ; Taiwan
    Language English
    Dates of publication 2014-05
    Size p. 117-123.
    Publishing place Elsevier Masson SAS
    Document type Article
    ZDB-ID 1033625-4
    ISSN 1146-609X
    ISSN 1146-609X
    DOI 10.1016/j.actao.2013.12.004
    Database NAL-Catalogue (AGRICOLA)

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