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Digitale Medien

Pollinator foraging behavior and pollen collection on the floral morphs of tristylous Pontederia cordata L. (1987)

Wolfe, L. M. ; Barrett, S. C. H.

Springer

Oecologia 74 (1987), S. 347-351

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ISSN: 1432-1939

Schlagwort(e): Pontederia cordata ; Bombus ; Tristyly ; Pollination ; Behavior

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary The foraging behavior of the pollinators of tristylous Pontederia cordata was studied to determine if differences in floral morphology would lead to preferential visitation of the floral morphs. Although nectar production is not different in the three floral morphs, differences in the production and size of pollen grains produced by the three anther levels results in the morphs offering variable amounts of resources to pollen-collecting insects. Bumblebees (Bombus spp.) and the solitary bee Melissodes apicata used P. cordata primarily as a nectar source and therefore did not seem to exhibit any morph preference. In contrast, honeybees visited flowers mainly for pollen and preferred to forage on long-level anthers of the short-and mid-styled morphs. An analysis of the composition of corbicular pollen loads indicated that, relative to the frequency of production in the population: 1) honeybees collected an excess of pollen from long-level anthers; 2) bumblebees collected the three types of pollen without any apparent preference; and 3) M. apicata preferentially collected pollen from the short-level anthers — presumably because their proboscides are modified by the presence of tiny hairs. The results suggest that P. cordata in Ontario is serviced by a diverse, unspecialized pollinator fauna which is not co-adapted to the tristylous floral polymorphism.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00378928

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Digitale Medien

Attachment of gelatin films to tissue using argon beam coagulator (1998)

Dapper, G. ; Wallace, D. G. ; Yamamoto, R. ; [weitere]

Hoboken, NJ : Wiley-Blackwell

Journal of Biomedical Materials Research 43 (1998), S. 89-98

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ISSN: 0021-9304

Schlagwort(e): gelatin ; films ; tissue ; bonding ; argon beam ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Medizin , Technik allgemein

Notizen: Cross-linked gelatin films were bonded to heart muscle and to lung pleura and parenchyma using the electrical discharge of an argon beam radiofrequency coagulator. The bonds were stable in warm saline buffer for minutes to hours. Bonding was thought to partly occur through a mechanical interlock of film and tissue elements. The interdigitation of tissue and film arose during exposure to the argon beam, which denatured protein constituents of both, and created a fluidized state that rapidly coalesced. © 1998 John Wiley & Sons, Inc. J Biomed Mater Res (Appl Biomater) 43: 89-98, 1998

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

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Digitale Medien

Heterostyly in the Lamiaceae: The case ofSalvia brandegeei (2000)

Barrett, S. C. H. ; Wilken, D. H. ; Cole, W. W.

Springer

Plant systematics and evolution 223 (2000), S. 211-219

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ISSN: 1615-6110

Schlagwort(e): Heterostyly ; distyly ; zygomorphic flowers ; self-compatibility ; protandry ; geitonogamy ; Lamiaceae ; rare plant species

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Heterostyly rarely occurs in families with strongly zygomorphic flowers. For this reason Darwin (1877) doubted whether heterostyly would occur in the Lamiaceae and recent reviews have not reported the floral polymorphism in this family. Here we describe distyly in a rare species ofSalvia restricted to bluffs and seaward canyons on Santa Rosa Island (Santa Barbara Co., California) and northwestern Baja California (Mexico).Salvia brandegeei is morphologically distylous with populations composed of equal frequencies of long-and short-styled morphs differing reciprocally in stigma and anther position. Controlled hand pollinations demonstrated no significant differences in the seed set of self, intramorph or intermorph pollinations. Unlike most heterostylous species investigated,S. brandegeei does not possess diallelic incompatibility or ancillary polymorphisms of pollen and stigmas. We propose that the evolution of distyly inS. brandegeei may have been associated with an ecological shift to a new environment in which protandry failed to prevent increased levels of geitonogamy. Heterostyly was then selected because it increased the proficiency of cross-pollination. The origin of distyly in self-compatibleS. brandegeei is consistent with Lloyd and Webb's theoretical model for the evolution of distyly.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00985280

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Choices in the climate commons (2018)

Barrett, S.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2018-12-14

Schlagwort(e): Editorials

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

Publiziert von American Association for the Advancement of Science (AAAS)

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