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  • 1
    Electronic Resource
    Electronic Resource
    Effect of different ant species on reproductive fitness of Schomburgkia tibicinis (Orchidaceae) (1989)
    Springer
    Oecologia 81 (1989), S. 487-489 
    Details
    ISSN: 1432-1939
    Keywords: Ant-plant interaction ; Ants ; Extrafloral nectar ; Orchids ; Mexico
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We studied the effect of four ant species on the reproductive fitness (number of fruits produced) of Schomburgkia tibicinis (Orchidaceae), in the coast of Yucatan, Mexico. Ants forage day and night for the nectar produced by the reproductive structures of the orchid. Ant size is: Camponotus planatus (3–4 mm), C. abdominalis (4–6 mm), C. rectangularis (7–9 mm), and Ectatomma tuberculatum (9–12 mm). The results indicate that ant efficiency in disrupting the activities of the main herbivore, (Stethobaris sp./Coleoptera) varies, and that it is apparently related to ant size, three tendencies are clear: (a) lowest fruit production and highest inflorescence damage are significantly associated with the smaller ants and the control; (b) maximum fruit production and minimum inflorescence damage are significantly associated with the larger ant species; and (c) the increase in ant size tends to have a positive effect on the plant's reproductive output (less dead spikes and more matured fruits). We discuss ant effect on the pollination of the orchid, and emphasize that ant presence should not be associated, in general, with benefit to plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378956
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Pollination of New CaledonianWinteraceae: Opportunistic shifts or parallel radiation with their pollinators? (1990)
    Springer
    Plant systematics and evolution 173 (1990), S. 143-157 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Winteraceae ; Zygogynum ; Lepidoptera ; Micropterigidae ; Sabatinca ; Coleoptera ; Pollination biology ; coevolution ; floral volatiles ; parallel radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Flower visitors on 12 species of New CaledonianWinteraceae were studied. The visitors were two species of ancestral moths (Sabatinca; Micropterigidae), three species of weevils (Palontus; Curculionidae), and a species of thrips. Behavior observations and pollen records suggest that the beetles and occasionally the moths serve as pollinators ofZygogynum and Exospermum, andBelliolum is pollinated primarily by thrips. The floral volatiles are simple in composition, usually dominated by short esters. Preliminary experiments showed that ethyl acetate elicited alighting, and a distinctive huddling behavior was elicited by artificially mixed fragrance. The host associations of otherSabatinca andPalontus spp. do not support the hypothesis that theWinteraceae have radiated in association with their pollinators. The available evidence supports the notion of opportunistic isolated host colonizations at some point in the radiation of the pollinator groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940859
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    Paper (German National Licenses)
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  • 3
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    Effect of different ant species on reproductive fitness of Schomburgkia tibicinis (Orchidaceae) (1989)
    Springer
    Details
    Publication Date: 1989-12-01
    Print ISSN: 0029-8549
    Electronic ISSN: 1432-1939
    Topics: Biology
    Published by Springer
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    PAPER CURRENT
  • 4
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    Effects of environmental changes on marsh vegetation with special reference to salinity (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A literature survey primarily concerned with brackish and salt marshes located along the eastern coast of North America and the Gulf Coast was presented. The review concentrated upon the vegetation of the marshes, particularly in regard to distribution, composition, succession, and productivity. Special efforts were made to include major works concerned with the Louisiana and Mississipi coastal marshes. It appears that spring to early summer (weeks 18-34 of the year; April - mid-July) is the best period of time to categorize the communities. It is during this time of the year that the communities appear most stable in regard to species composition. This allows a strong correlation to be drawn between the salinity of the region and the dominant species of the community. As such, this would seem to be best period in which to sample the marsh via air or land for differences in vegetation and salinity.
    Keywords: GEOSCIENCES (GENERAL)
    Type: NASA-CR-147585
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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