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  • GBV  (37)
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  • 1
    UID:
    (DE-627)488087570
    Format: Online-Ressource
    Note: Bayreuth, Univ., Diss, 2003
    Language: English
    Subjects: Biology
    RVK:
    Keywords: Queensland ; Tropischer Regenwald ; Ameisen ; Trophobiose ; Honigtau ; Queensland ; Tropischer Regenwald ; Ameisen ; Trophobiose ; Nektar ; Hochschulschrift
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  • 2
    Book
    Book
    Wagenfeld-Ströhnen : BUND-Projekt Diepholzer Moorniederung
    UID:
    (DE-627)306123444
    Format: 77 Bl , Ill., graph. Darst
    Note: Literaturverz. Bl. 76 - 77
    Language: German
    Keywords: Lurche ; Moor
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  • 3
    UID:
    (DE-627)820356743
    Format: 16 S
    Content: Like many other bees worldwide, honeybees and bumblebees are threatened by human-induced disturbances. Yet some species decline and others thrive, likely due to different foraging strategies. As little is known about how resource intake translates into nutrients available to colonies, our study aimed to better understand how differences in foraging strategies may affect colony health by relating differences in pollen spectra collected to differences in nutrient composition. The Apis and Bombus colonies studied were all located at the same site, but nevertheless differed in the spectra of plant species visited for pollen collection and the quality of pollen collected. Bumblebees generally collected pollen with significantly higher pollen protein content and more essential amino acids. Unlike honeybees that tend to exploit large resource patches, bumblebees thus seem to select the “better” pollen and to focus on quality instead of quantity.
    Content: Like many other bees worldwide, honeybees and bumblebees are threatened by human-induced disturbances. Yet some species decline and others thrive, likely due to different foraging strategies. As little is known about how resource intake translates into nutrients available to colonies, our study aimed to better understand how differences in foraging strategies may affect colony health by relating differences in pollen spectra collected to differences in nutrient composition. The Apis and Bombus colonies studied were all located at the same site, but nevertheless differed in the spectra of plant species visited for pollen collection and the quality of pollen collected. Bumblebees generally collected pollen with significantly higher pollen protein content and more essential amino acids. Unlike honeybees that tend to exploit large resource patches, bumblebees thus seem to select the “better” pollen and to focus on quality instead of quantity.
    In: Apidologie, (2012), 4, Seite 449-464
    In: year:2012
    In: number:4
    In: pages:449-464
    Language: English
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  • 4
    UID:
    (DE-627)820352128
    Format: 7 S
    Content: Plant resins are used by stingless bees for nest construction and maintenance. To reveal factors that influence the bees' decision about where and when to collect resin, resin collection was studied in ten stingless bee species (Apidae, Meliponini) collecting resin at natural and artificially induced wounds of nine tree species in Borneo. Artificially induced wounds were found by bees within 1-2 d. The number of foragers at artificial wounds increased during the subsequent 5 d until resin secretion stopped or the resin hardened. At natural resin wounds, species identity and number of foragers remained constant during the observation period. Bees collected resin from some trees and ignored others. Agathis borneensis (Araucariaceae) was the most attractive resin source. The bees' visitation rate did not correlate significantly with resin wound size. Inter- and intraspecific aggression occurred at ten resin wounds. In Tetragonilla collina and Tetragonula melanocephala, we additionally recorded resin intake at colony entrances. The proportion of workers retuning with resin varied considerably between colonies. We observed attacks by ants at three of our eight focal colonies, which resulted in a significant increase in resin intake while the nest was under attack and until 1-2 d after the attack had stopped. The increase in resin collection triggered by ant attacks was even stronger than the increase following a manual destruction of the nest entrance tube.
    Content: Plant resins are used by stingless bees for nest construction and maintenance. To reveal factors that influence the bees' decision about where and when to collect resin, resin collection was studied in ten stingless bee species (Apidae, Meliponini) collecting resin at natural and artificially induced wounds of nine tree species in Borneo. Artificially induced wounds were found by bees within 1-2 d. The number of foragers at artificial wounds increased during the subsequent 5 d until resin secretion stopped or the resin hardened. At natural resin wounds, species identity and number of foragers remained constant during the observation period. Bees collected resin from some trees and ignored others. Agathis borneensis (Araucariaceae) was the most attractive resin source. The bees' visitation rate did not correlate significantly with resin wound size. Inter- and intraspecific aggression occurred at ten resin wounds. In Tetragonilla collina and Tetragonula melanocephala, we additionally recorded resin intake at colony entrances. The proportion of workers retuning with resin varied considerably between colonies. We observed attacks by ants at three of our eight focal colonies, which resulted in a significant increase in resin intake while the nest was under attack and until 1-2 d after the attack had stopped. The increase in resin collection triggered by ant attacks was even stronger than the increase following a manual destruction of the nest entrance tube.
    In: Biotropica, (2009), 6, Seite 730-736
    In: year:2009
    In: number:6
    In: pages:730-736
    Language: English
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  • 5
    UID:
    (DE-627)820403202
    Format: 10 S
    Content: Ecological niche breadth (specialisation) and niche differentiation (complementarity) play a key role for species coexistence and hence biodiversity. Some niche dimensions of a species represent ecosystem functions or services such as pollination (functional niche). When species differ in their contribution to some collective function (functional complementarity), this implies that functions from several species are required for a high overall functional performance level. Applied to plant–pollinator interactions, functional complementary suggests that a higher diversity of pollinators contributes to an increased pollination success of the plants or, in turn, that a higher diversity of flowers may better sustain the consumers’ requirements. Complementarity can affect functioning at different scales: the collective functioning of the target community, a single species, an individual or even a part of the individual, e.g. a single flower. Recent network analyses revealed that plant–pollinator interactions display a relatively high extent of complementary specialisation at the community scale. We propose several mechanisms that generate complementarity. From the consumers’ viewpoint, differences in flowering phenology and/or nutritional variation in floral resources (nectar, pollen) may explain a complementary role of different flower species. From the plant's viewpoint, temporal or environmental variation in the pollinator species’ activities may contribute to complementary effects on pollination of plant communities. In addition, different species may also pollinate either more exposed or more sheltered flowers from the same plant individual, or vary in their functions within single flowers. So far, empirical evidence for complementary effects in general, and particularly mechanistic explanations of such effects are scant and will require comparative investigations at multiple scales in the future. Such studies will help us to understand if and how biodiversity maintains the quality and quantity of plant–pollinator functional relationships.
    Content: Nischendifferenzierung (Komplementarität) und ökologische Nischenbreite (Spezialisierung) spielen eine Schlüsselrolle in der Koexistenz von Arten und demzufolge für die Biodiversität. Einige Nischendimensionen von Arten bilden Ökosystemfunktionen (funktionale Nische) wie z.B. Bestäubung. Wenn Arten sich in ihrem funktionellen Beitrag unterscheiden (funktionale Komplementarität), lässt das darauf schließen, dass artenreiche Gemeinschaften insgesamt leistungsfähiger als artenarme Gemeinschaften sind. Bezogen auf die Interaktionen von Blüten und Bestäubern impliziert funktionale Komplementarität, dass eine größere Artenvielfalt der Bestäuber zu einer besseren Bestäubung der Pflanzenarten beiträgt und umgekehrt eine größere Blütenvielfalt besser die Ansprüche der Bestäuberarten deckt. Komplementarität kann bei unterschiedlichen Skalen ansetzen und die kollektive Funktion der Gemeinschaft beeinflussen, die Funktion einer einzigen Art, eines Individuums oder sogar nur eines Teils eines Individuums, z.B. einer einzelnen Blüte. Neuere Netzwerkanalysen zeigen eine stark ausgeprägte Komplementarität der Interaktionen zwischen Pflanzen- und Bestäuberarten auf Gemeinschaftsniveau. Wir fassen unterschiedliche Mechanismen zusammen, die Komplementarität hervorbringen. Aus der Sicht des Konsumenten können Unterschiede in der Phänologie oder Unterschiede in den Nährstoffressourcen der Blüten (z.B. Nektar, Pollen) eine komplementäre Rolle mehrerer Pflanzenarten erklären. Aus der Sicht der Pflanze können zeitliche oder wetterbedingte Aktivitätsunterschiede der Bestäuberarten zu komplementären Effekte bei der Bestäubung beitragen. Außerdem können verschiedene Tierarten unterschiedlich räumlich verteilte Blüten eines Pflanzenindividuums bestäuben oder sich die Funktion innerhalb einer Blüte aufteilen. Bis heute sind empirische Nachweise komplementärer Effekte und mechanistische Erklärungen für solche Effekte selten untersucht worden. Zukünftige vergleichende Untersuchungen zu Komplementaritätseffekten sollten verschiedene Skalen berücksichtigen. Solche Studien können zum Verständnis beitragen, ob und wie Artenvielfalt die Qualität und Quantität der funktionellen Beziehungen zwischen Blüten und Bestäubern fördert.
    In: Basic and Applied Ecology, (2011), 4, Seite 282-291
    In: year:2011
    In: number:4
    In: pages:282-291
    Language: English
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  • 6
    UID:
    (DE-627)864714378
    Format: 1 Online-Ressource
    Note: Dissertation Darmstadt, Technische Universität Darmstadt 2012
    Additional Edition: Erscheint auch als Druck-Ausgabe Kalinkat, 1977- Towards an understanding of complexity
    Language: English
    Keywords: Hochschulschrift
    URL: Volltext  (kostenfrei)
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  • 7
    UID:
    (DE-627)1025067126
    Format: 1 Online-Ressource
    Note: Dissertation Darmstadt, Technische Universität Darmstadt 2018
    Language: English
    Keywords: Hochschulschrift
    URL: Volltext  (kostenfrei)
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  • 8
    UID:
    (DE-627)864726449
    Format: 1 Online-Ressource
    Note: Dissertation Darmstadt, Technische Universität Darmstadt 2013
    Additional Edition: Erscheint auch als Druck-Ausgabe Ehnes, 1979- Allometry - relations to energy and abundance
    Language: English
    Keywords: Hochschulschrift
    URL: Volltext  (kostenfrei)
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  • 9
    UID:
    (DE-627)867579625
    Format: 1 Online-Ressource
    Note: Dissertation Darmstadt, Technische Universität Darmstadt 2015
    Language: English
    Keywords: Hochschulschrift
    URL: Volltext  (kostenfrei)
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  • 10
    UID:
    (DE-627)82035211X
    Format: 14 S
    Content: Insects may be unique in having a cuticle with a species-specific chemical profile. In social insects, colony survival depends not only on species-specific but also on colony-specific cuticular compounds with hydrocarbons playing an important role in the communication systems of ants, termites, wasps and bees. We investigated inter- and intraspecific differences in the composition of compounds found on the body surface of seven paleotropical stingless bee species (Apidae: Meliponini) at two different sites in Borneo (Sabah, Malaysia). Besides hydrocarbons, the body surface of all seven stingless bee species comprised terpenoid compounds, a substance class that has not been reported for chemical profiles of any social insect so far. Moreover, the chemical profile of some species differed fundamentally in the composition of terpenoids with one group (e.g. sesquiterpenes) being present in one species, but missing in another. Chemical profiles of different colonies from the same species showed the same hydrocarbon- and terpenoid compounds over different regions, as tested for Tetragonilla collina and Tetragonula melanocephala. However, chemical profiles differed quantitatively between the different colonies especially in T. melanocephala. It is likely that the terpenoids are derived from plant resins because stingless bees are known to collect and use large amounts of resins for nest construction and defence, suggesting an environmental origin of the terpenoids in the chemical profile of paleotropical stingless bees.
    Content: Insects may be unique in having a cuticle with a species-specific chemical profile. In social insects, colony survival depends not only on species-specific but also on colony-specific cuticular compounds with hydrocarbons playing an important role in the communication systems of ants, termites, wasps and bees. We investigated inter- and intraspecific differences in the composition of compounds found on the body surface of seven paleotropical stingless bee species (Apidae: Meliponini) at two different sites in Borneo (Sabah, Malaysia). Besides hydrocarbons, the body surface of all seven stingless bee species comprised terpenoid compounds, a substance class that has not been reported for chemical profiles of any social insect so far. Moreover, the chemical profile of some species differed fundamentally in the composition of terpenoids with one group (e.g. sesquiterpenes) being present in one species, but missing in another. Chemical profiles of different colonies from the same species showed the same hydrocarbon- and terpenoid compounds over different regions, as tested for Tetragonilla collina and Tetragonula melanocephala. However, chemical profiles differed quantitatively between the different colonies especially in T. melanocephala. It is likely that the terpenoids are derived from plant resins because stingless bees are known to collect and use large amounts of resins for nest construction and defence, suggesting an environmental origin of the terpenoids in the chemical profile of paleotropical stingless bees.
    In: Insectes Sociaux, (2009), 2, Seite 157-170
    In: year:2009
    In: number:2
    In: pages:157-170
    Language: English
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