Results 181 to 190 of about 3,096 (199)
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Protandry and inbreeding depression inHebe amplexicaulis(Scrophulariaceae)
New Zealand Journal of Botany, 1982Abstract Hebe amplexicaulis plants are self-compatible hermaphrodites, but strong inbreeding depression was evident in one line derived from self-pollination. Automatic self-pollination is prevented by strong protandry but insect-mediated geitonogamy is always possible.
P. J. Garnock-Jones, B. P. J. Molloy
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American Journal of Botany, 1993
Cephalanthus occidentalis L. is protandrous and presents pollen secondarily on the stigma surface. Because self‐pollen is present on the stigma, the degree of selling vs. outcrossing in this species will depend on 1) the phenology of pollen presentation and stigma receptivity; 2) whether the species is self‐incompatible; and 3) the rates of self vs ...
Fiona M. Imbert, Jennifer H. Richards
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Cephalanthus occidentalis L. is protandrous and presents pollen secondarily on the stigma surface. Because self‐pollen is present on the stigma, the degree of selling vs. outcrossing in this species will depend on 1) the phenology of pollen presentation and stigma receptivity; 2) whether the species is self‐incompatible; and 3) the rates of self vs ...
Fiona M. Imbert, Jennifer H. Richards
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Protandry and Moulting to Maturity in the Spider Pityohyphantes phrygianus
Oikos, 1990In natural populations in SW Sweden, the overwintering subadult specimens of the sheetweb spider Pityohyphantes phrygianus (C. L. Koch) moult to maturity in late spring, the males on average maturing before the females. In laboratory experiments, three environmental cues were manipulated―photoperiod, temperature and food level―to assess their ...
Bengt Gunnarsson +2 more
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MATHEMATICAL MODELING OF POPULATION DYNAMICS WITH PROTANDRY
Informatika i sistemy upravleniyaA mathematical model of population dynamics with protandry and density-dependent birth rate regulation is proposed. An analytical and numerical study of the model is conducted. It is shown that regular, quasi-periodic and chaotic oscillations, as well as multistability, arise in the model, i.e. a change in the dynamics regime is possible.
A.A. GROMYKO, G.P. NEVEROVA
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Protandry in two species of Streptanthus (Cruciferae)
1963(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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Protogyny, protandry, and bimodal emergence patterns in necrophagous Diptera
The Canadian Entomologist, 2001AbstractThe emergence patterns of Diptera breeding in small-sized and buried carrion were studied in rearing experiments with field-exposed baits. Development times are reported for 52 species in the families Phoridae, Sphaeroceridae, Sepsidae, Heleomyzidae, Anthomyiidae, Fanniidae, Muscidae, Sarcophagidae, Psychodidae, and Sciaridae.
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The emergence of insect protandry: a "natural" evolutionary computation application
Proceedings of 1997 IEEE International Conference on Evolutionary Computation (ICEC '97), 2002When resources and their consumers have matching distributions in space or time, an ideal free distribution (IFD) is achieved, whereby each consumer receives the same amount of resource. In nature, both spatial and temporal IFDs are commonplace, with protandry in insects providing a popular textbook example of the latter.
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Protandry, pollination, and self-incompatibility inDiscaria toumatou
New Zealand Journal of Botany, 1985Abstract Discaria toumatou (Rhamnaceae) is a spiny shrub endemic to New Zealand. The small white flowers are protandrous. Pollen is presented first and removed by wasps, flies, and bees which visit the flowers; after one to three days the three stylar branches unfold and an exudate is produced covering the stigmatic area at the tip of each branch ...
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Oecologia, 1986
The neotropical shrub Pentagonia macrophylla Benth. (Rubiaceae) has protandrous two-day flowers. Synchronous development among flowers on a single individual results in sequential phenotypic unisexuality: the entire plant alternates gender from day to day.
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The neotropical shrub Pentagonia macrophylla Benth. (Rubiaceae) has protandrous two-day flowers. Synchronous development among flowers on a single individual results in sequential phenotypic unisexuality: the entire plant alternates gender from day to day.
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