The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Phillip B. Fenberg - One of the best experts on this subject based on the ideXlab platform.
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Nectar robbing in the trainbearers (Lesbia, Trochilidae)
PeerJ, 2020Co-Authors: Boris Igic, Ivory Nguyen, Phillip B. FenbergAbstract:Many flower visitors engage in floral larceny, a suite of so-called ’illegitimate’ visits in which foragers take nectar without providing pollination services. The data on prevalence of illegitimate visits among hummingbirds, as well as the total proportion of foraging and diet that such visits comprise is broadly lacking. Here, we report the occurrence of nectar larceny in the two currently recognized species of trainbearers and analyze the proportion of plant visits categorized by mode of interaction as: robbing, theft, and/or pollination. We augment our original field observations using a trove of data from citizen science databases. Although it is difficult to distinguish primary vs. secondary robbing and theft vs. pollination, we conservatively estimate that ca. 40% of the recorded nectar foraging visits involve nectar robbing. Males appear to engage in robbing marginally more than females, but further studies are necessary to confidently examine the multi-way interactions among sex, species, mode of visitation, and other factors. Our results also indicate that the suggested relationship between serrations on bill tomia and traits such as nectar robbing or territorial defense may be complicated. We discuss the significance of these findings in the context of recent developments in study of nectar foraging, larceny, and pollination from both avian and plant perspectives.
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Nectar robbing in the trainbearers (Lesbia, Trochilidae)
2020Co-Authors: Boris Igic, Ivory Nguyen, Phillip B. FenbergAbstract:Many flower visitors engage in floral larceny, a suite of so-called illegitimate visits in which foragers take nectar without providing pollination services. The data on prevalence of illegitimate visits among hummingbirds, as well as the total proportion of foraging and diet that such visits comprise is broadly lacking. Here, we report the occurrence of nectar larceny in both currently recognized species of trainbearers and analyze the proportion of plant visits categorized by mode of interaction as: primary robbing, secondary robbing, theft, and/or pollination. To the best of our knowledge, we provide the first published report identifying robbing in these species. We augment our original field observations using a trove of data from citizen science databases and literature. Although it is difficult to distinguish primary vs. secondary robbing and theft vs. pollination, we conservatively estimate that ca. 40% of the recorded nectar foraging visits involve nectar robbing. Males appear to engage in robbing marginally more than females, but further studies are necessary to confidently examine the multi-way interactions among sex, species, mode of visitation, and other factors. We discuss the significance of these findings in the context of recent developments in study of nectar foraging, larceny, and pollination from both avian and plant perspectives.
Wilhelm Barthlott - One of the best experts on this subject based on the ideXlab platform.
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Pollen-connecting threads in Heliconia ( Heliconiaceae )
Plant Systematics and Evolution, 1995Co-Authors: Marie-jeanette Rose, Wilhelm BarthlottAbstract:InHeliconia thread-like structures connecting the pollen grains are described. These threads are decay products of the walls separating the pollen chambers, and products of the rupture of the mature anthers in the stomium region. The pliable cell threads mix with the pollen and entangle individual grains to form aggregates. This ensures that the pollen becomes embedded in the feathers or attached to the smooth, unsculptured beak of pollinating hummingbirds (Trochilidae).—Structure and origin of theHeliconia threads differ from those of the related genusStrelitzia (Strelitziaceae).
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Pollen-connecting threads inHeliconia (Heliconiaceae)
Plant Systematics and Evolution, 1995Co-Authors: Marie-jeanette Rose, Wilhelm BarthlottAbstract:In Heliconia thread-like structures connecting the pollen grains are described. These threads are decay products of the walls separating the pollen chambers, and products of the rupture of the mature anthers in the stomium region. The pliable cell threads mix with the pollen and entangle individual grains to form aggregates. This ensures that the pollen becomes embedded in the feathers or attached to the smooth, unsculptured beak of pollinating hummingbirds ( Trochilidae ).—Structure and origin of the Heliconia threads differ from those of the related genus Strelitzia ( Strelitziaceae ).
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Coloured Pollen in Cactaceae: a Mimetic Adaptation to Hummingbird‐Pollination?
Botanica Acta, 1994Co-Authors: Marie-jeanette Rose, Wilhelm BarthlottAbstract:Pollen of 361 species from 71 genera of Cactaceae was investigated for this study of the correlation between pollen colour and the pollination syndrome. 11% of all species studied had red or brown pollen, and nearly all of these species were ornithophilous. This suggests that pollen colour probably is part of the bird-flower syndrome of Cactaceae. Possibly the red or brown pollen might be a crypto-mimetic adaptation to the dark coloured bill of the pollinating hummingbird (Trochilidae) and secures safe transport to a receptive stigma without being removed by the bird immediately. The results are discussed against a background of studies encompassing about 900 species from 77 families, which provide further evidence for the proposed adaptive significance of palynological characters.
Boris Igic - One of the best experts on this subject based on the ideXlab platform.
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Nectar robbing in the trainbearers (Lesbia, Trochilidae)
PeerJ, 2020Co-Authors: Boris Igic, Ivory Nguyen, Phillip B. FenbergAbstract:Many flower visitors engage in floral larceny, a suite of so-called ’illegitimate’ visits in which foragers take nectar without providing pollination services. The data on prevalence of illegitimate visits among hummingbirds, as well as the total proportion of foraging and diet that such visits comprise is broadly lacking. Here, we report the occurrence of nectar larceny in the two currently recognized species of trainbearers and analyze the proportion of plant visits categorized by mode of interaction as: robbing, theft, and/or pollination. We augment our original field observations using a trove of data from citizen science databases. Although it is difficult to distinguish primary vs. secondary robbing and theft vs. pollination, we conservatively estimate that ca. 40% of the recorded nectar foraging visits involve nectar robbing. Males appear to engage in robbing marginally more than females, but further studies are necessary to confidently examine the multi-way interactions among sex, species, mode of visitation, and other factors. Our results also indicate that the suggested relationship between serrations on bill tomia and traits such as nectar robbing or territorial defense may be complicated. We discuss the significance of these findings in the context of recent developments in study of nectar foraging, larceny, and pollination from both avian and plant perspectives.
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Nectar robbing in the trainbearers (Lesbia, Trochilidae)
2020Co-Authors: Boris Igic, Ivory Nguyen, Phillip B. FenbergAbstract:Many flower visitors engage in floral larceny, a suite of so-called illegitimate visits in which foragers take nectar without providing pollination services. The data on prevalence of illegitimate visits among hummingbirds, as well as the total proportion of foraging and diet that such visits comprise is broadly lacking. Here, we report the occurrence of nectar larceny in both currently recognized species of trainbearers and analyze the proportion of plant visits categorized by mode of interaction as: primary robbing, secondary robbing, theft, and/or pollination. To the best of our knowledge, we provide the first published report identifying robbing in these species. We augment our original field observations using a trove of data from citizen science databases and literature. Although it is difficult to distinguish primary vs. secondary robbing and theft vs. pollination, we conservatively estimate that ca. 40% of the recorded nectar foraging visits involve nectar robbing. Males appear to engage in robbing marginally more than females, but further studies are necessary to confidently examine the multi-way interactions among sex, species, mode of visitation, and other factors. We discuss the significance of these findings in the context of recent developments in study of nectar foraging, larceny, and pollination from both avian and plant perspectives.
Marie-jeanette Rose - One of the best experts on this subject based on the ideXlab platform.
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Pollen-connecting threads in Heliconia ( Heliconiaceae )
Plant Systematics and Evolution, 1995Co-Authors: Marie-jeanette Rose, Wilhelm BarthlottAbstract:InHeliconia thread-like structures connecting the pollen grains are described. These threads are decay products of the walls separating the pollen chambers, and products of the rupture of the mature anthers in the stomium region. The pliable cell threads mix with the pollen and entangle individual grains to form aggregates. This ensures that the pollen becomes embedded in the feathers or attached to the smooth, unsculptured beak of pollinating hummingbirds (Trochilidae).—Structure and origin of theHeliconia threads differ from those of the related genusStrelitzia (Strelitziaceae).
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Pollen-connecting threads inHeliconia (Heliconiaceae)
Plant Systematics and Evolution, 1995Co-Authors: Marie-jeanette Rose, Wilhelm BarthlottAbstract:In Heliconia thread-like structures connecting the pollen grains are described. These threads are decay products of the walls separating the pollen chambers, and products of the rupture of the mature anthers in the stomium region. The pliable cell threads mix with the pollen and entangle individual grains to form aggregates. This ensures that the pollen becomes embedded in the feathers or attached to the smooth, unsculptured beak of pollinating hummingbirds ( Trochilidae ).—Structure and origin of the Heliconia threads differ from those of the related genus Strelitzia ( Strelitziaceae ).
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Coloured Pollen in Cactaceae: a Mimetic Adaptation to Hummingbird‐Pollination?
Botanica Acta, 1994Co-Authors: Marie-jeanette Rose, Wilhelm BarthlottAbstract:Pollen of 361 species from 71 genera of Cactaceae was investigated for this study of the correlation between pollen colour and the pollination syndrome. 11% of all species studied had red or brown pollen, and nearly all of these species were ornithophilous. This suggests that pollen colour probably is part of the bird-flower syndrome of Cactaceae. Possibly the red or brown pollen might be a crypto-mimetic adaptation to the dark coloured bill of the pollinating hummingbird (Trochilidae) and secures safe transport to a receptive stigma without being removed by the bird immediately. The results are discussed against a background of studies encompassing about 900 species from 77 families, which provide further evidence for the proposed adaptive significance of palynological characters.
Ivory Nguyen - One of the best experts on this subject based on the ideXlab platform.
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Nectar robbing in the trainbearers (Lesbia, Trochilidae)
PeerJ, 2020Co-Authors: Boris Igic, Ivory Nguyen, Phillip B. FenbergAbstract:Many flower visitors engage in floral larceny, a suite of so-called ’illegitimate’ visits in which foragers take nectar without providing pollination services. The data on prevalence of illegitimate visits among hummingbirds, as well as the total proportion of foraging and diet that such visits comprise is broadly lacking. Here, we report the occurrence of nectar larceny in the two currently recognized species of trainbearers and analyze the proportion of plant visits categorized by mode of interaction as: robbing, theft, and/or pollination. We augment our original field observations using a trove of data from citizen science databases. Although it is difficult to distinguish primary vs. secondary robbing and theft vs. pollination, we conservatively estimate that ca. 40% of the recorded nectar foraging visits involve nectar robbing. Males appear to engage in robbing marginally more than females, but further studies are necessary to confidently examine the multi-way interactions among sex, species, mode of visitation, and other factors. Our results also indicate that the suggested relationship between serrations on bill tomia and traits such as nectar robbing or territorial defense may be complicated. We discuss the significance of these findings in the context of recent developments in study of nectar foraging, larceny, and pollination from both avian and plant perspectives.
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Nectar robbing in the trainbearers (Lesbia, Trochilidae)
2020Co-Authors: Boris Igic, Ivory Nguyen, Phillip B. FenbergAbstract:Many flower visitors engage in floral larceny, a suite of so-called illegitimate visits in which foragers take nectar without providing pollination services. The data on prevalence of illegitimate visits among hummingbirds, as well as the total proportion of foraging and diet that such visits comprise is broadly lacking. Here, we report the occurrence of nectar larceny in both currently recognized species of trainbearers and analyze the proportion of plant visits categorized by mode of interaction as: primary robbing, secondary robbing, theft, and/or pollination. To the best of our knowledge, we provide the first published report identifying robbing in these species. We augment our original field observations using a trove of data from citizen science databases and literature. Although it is difficult to distinguish primary vs. secondary robbing and theft vs. pollination, we conservatively estimate that ca. 40% of the recorded nectar foraging visits involve nectar robbing. Males appear to engage in robbing marginally more than females, but further studies are necessary to confidently examine the multi-way interactions among sex, species, mode of visitation, and other factors. We discuss the significance of these findings in the context of recent developments in study of nectar foraging, larceny, and pollination from both avian and plant perspectives.
