Leading up to the National Moth Week on July 22, we interview some contributors of moth observations.Listen to the first podcast episode with Nagesh O. S. on the IBP blog.

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2 documents found tagged reproductive biology [X]
  • Title
    Evaluation of some mangrove species on the nature of their reproduction along the coastal belt of the Indian Sunderbans
    Type
    Journal Article
    Description
    Reproductive biology of three dominating mangrove species Rhizophora mucronata, Ceriops decandra and Avicennia marina from the Indian Sunderbans were studied. A comparative account on all floral parts revealed that as the bud progresses to completely open, the length of androecium surpassed the length of gynoecium and the anther matured first thus showing protandrous nature and favouring cross-fertilization. A study of pollen grain viability revealed that all of them produces fairly good amounts of viable pollen grains in their natural condition. The pollens showed their maximum viability late in the morning till early noon. The stigma showed peak receptivity after three days of flower opening in C. decandra and four days of flower opening in R. mucronata and A. marina. All the species showed out-breeding mechanism of pollination. The fruit setting percentage obtained by xenogamy was the highest and autogamy failed to show any result in all the three genera. Although Ceriops decandra and Avicennia marina showed very limited fruit set with geitonogamy, these two species can be called facultative out-crossers, while Rhizophora was obligate outcrosser in nature. The study on floral structure, pollen viability along with stigma receptivity of the investigated taxa guided to maximum exploitation of reproductive behavior for rising artificial and natural plant population in addition to build up a future research strategy in ecosystem conservation.
    Attribution
    Ghosh Arunima, Chakraborti Prabir (2012). Journal of Threatened Taxa 3(4) pp. 2427-2435; doi:10.11609/JoTT.o2416.2427-35
  • Title
    Bionomics of a lesser known goby, Stenogobius gymnopomus (Bleeker, 1853) (Perciformes: Gobiidae) from southern Kerala, India
    Type
    Journal Article
    Description
    The biology of a lesser known goby, Stenogobius gymnopomus was studied from the freshwater systems of southern Kerala. Dietary analysis showed that S. gymnopomus is a euryphagous feeder and an omnivore. Cladocerans, together with fish eggs and scales, constituted the major food items. The minimum size at first maturity for male S. gymnopomus is 78mm and for females 72mm. This species was found to be a batch spawner with a prolonged spawning season extending from August to December. Fecundity ranged from 46,323 to 61,291 eggs. Sex ratios revealed that local populations of S. gymnopomus are male dominated.
    Attribution
    Lekshmi S., Prasad G., Kumari S.D.R. (2010). Journal of Threatened Taxa 13(2) pp. 1359-1364; doi:10.11609/JoTT.o2328.1359-64