Abstract:
:We studied seed germination and seedling growth of the Mexican sunflower Tithonia diversifolia in Nigeria. This involved the usage of some dormancy-releasing methods and the effect of some concentrations of three herbicide formulations on the young seedlings. Initial germination tests on fresh and stored seeds revealed a low percentage germination of less than 30%. The seeds of the weed exhibit dormancy. Subjecting the seeds to wet heat at 80 and 100 degrees C and light treatment terminated dormancy both in the fresh and stored seeds. Light greatly enhanced the germination percentage of seeds by about 70%. There was gradual increase in germination percentage with increase in storage period in dormancy-released seeds. The mean LAR (Leaf Area Ratio), NAR (Net Assimilation Rate) and RGR (Relative Growth Rate) are comparatively high in young seedlings. Concentrations of 0.5-2.0% of Gramoxone, Primextra and Galex are toxic to 1 month old seedlings. For eradication, the seedlings should be attacked at one month stage.
journal_name
Rev Biol Tropjournal_title
Revista de biologia tropicalauthors
Agboola DA,Idowu WF,Kadiri Mdoi
10.15517/rbt.v54i2.13881subject
Has Abstractpub_date
2006-06-01 00:00:00pages
395-402issue
2eissn
0034-7744issn
2215-2075journal_volume
54pub_type
杂志文章abstract::This study describes temporal and spatial abundance patterns of echinoderm larvae in La Parguera, Puerto Rico. For the temporal study, larvae were sampled by a series of monthly tows taken with a 64 microm mesh net between the new and full moon from April 2005 to July 2006, September 2006 and August 2007. In order to ...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2010-10-01 00:00:00
abstract::The availability of data sets covering more than a year is scarce for tropical environments. Advances in hardware and software speed-up the re-analysis of old data sets and facilitates the identification of hidden data patterns. From February 1984 to April 1987 (49 sampling dates), core samples (17.7cm2, 15cm deep) we...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2011-09-01 00:00:00
abstract::The advancing agricultural frontier has led to an important loss of natural habitats, with significant consequences for biodiversity. The demography for two species of anurans, Physalaemus biligonigerus and Rhinella arenarum, both associated with agricultural systems in the central region of the C6rdoba Province, were...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2013-09-01 00:00:00
abstract::Nutrients and chlorophylls concentrations, as well as salinity, temperature and Secchi disk depth were determined from November 1999 to April 2000, at three stations and two depths, at Gandoca lagoon, Gandoca-Manzanillo National Wildlife Refuge, Limón, Costa Rica. Salinity profiles indicated that the lagoon was a salt...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2004-12-01 00:00:00
abstract::A new species, Cirripathes secchini (Cnidaria: Antipatharia) from the Abrolhos area (Bahia, Brazil) is described and constitutes the first record to this genus from Brazil. Two other species (Antipathes hirta, first record from the Southwestern Atlantic; and Antipathes fernandezi, first record from the Atlantic Ocean)...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2002-09-01 00:00:00
abstract::Lime juice killed millions of Vibrio cholerae O1, El Tor, Inaba, present on cabbage and lettuce contaminated in the laboratory. The lethal effect was evident within 5 min of exposure to lime juice. No vibrios could be recovered at dilution 1:10 using alkaline peptone water (APW) and thiosulfate-citrate-bile salts-sacc...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:1994-12-01 00:00:00
abstract::The diversity, composition and structure of vegetation in a cattle landscape in Matiguás, Nicaragua was characterized, and the floristic and structural differences of six types of habitats (secondary forests, riparian forests, charrales, live fences and pastures with high and low tree cover) were compared. A total of ...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2005-09-01 00:00:00
abstract::The aquatic gastropod mollusc, Pyrgophorus coronatus, may perform an important role in the transmission of an emergent ocular pathology among fishes in Lake Apoyo, Nicaragua. This disease emerged after an introduction of tilapia (Oreochromis niloticus) and the subsequent loss of Chara sp. beds in the lake. We compared...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v56i1.5511
更新日期:2008-03-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2009-03-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2006-12-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v64i1.18334
更新日期:2016-03-01 00:00:00
abstract::To demonstrate that T. lewisi infection increases T. gondii multiplication in white rats, groups of five Wistar or Sprague Dawley rats were inoculated with 10(6) T. lewisi trypomastigotes and four or seven days later infected with Toxoplasma tachyzoites. Host survival time was monitored, and the presence of T. gondii ...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:1997-06-01 00:00:00
abstract::In Costa Rica, cervical cancer is the second most common female cancer, despite accessibility of screening through the universal health care system. There is little understanding of knowledge levels of the adolescent population on cervical cancer, although this population is the most exposed to risk factors. This stud...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v62i3.14063
更新日期:2014-09-01 00:00:00
abstract::Starch gel electrophoresis was used to analyze the allelic variability of four polymorphic loci (Lap-2, Lap-3, Pgm and Gpi) from a single population of Artemia franciscana (Kellogg, 1906) from the Great Salt Lake (Utah, USA), cultured under eight different experimental conditions. The organisms were cultured to the ad...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2002-03-01 00:00:00
abstract::In recent years, the use of new scientific techniques has effectively improved aquaculture production processes. Astaxanthin has various properties in aquaculture and its antioxidant benefits have been closely related to stress resistance; besides, it is an essential factor for growth in many crustaceans and fish. The...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v62i4.13057
更新日期:2014-12-01 00:00:00
abstract::The semi-arid Caatinga is the fourth largest biome of Brazil, which biota still remains one of the most poorly known, especially with regard to invertebrate groups. In this study, a ground-foraging ant assemblage was surveyed during one year and the effect of rainfall on pitfall trapping was assessed. The study was pe...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v59i4.3426
更新日期:2011-12-01 00:00:00
abstract::The Cuban archipelago has 79 Phyllophaga species with a 98.6 % of endemism, which makes the group ecologically and economically important, as some species are classified as crop pests. The aim of this study was to determine the relationship between the composition and structure of the Phyllophaga assemblages with thei...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v65i1.23286
更新日期:2017-03-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2008-12-01 00:00:00
abstract::Biomarkers are a widely applied approach in environmental studies. Analyses of cholinesterase (ChE), glutathione S-transferase (GST) and lipid peroxidation (LPO) are biomarkers that can provide information regarding early effects of pollutants at different biochemical levels on an organism. The aim of this study was t...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v60i1.2769
更新日期:2012-03-01 00:00:00
abstract::The Mato Grosso is a typical Atlantic Forest stream located on the East coast of Brazil, approximately 70 km from Rio de Janeiro city. From its source at about 800m a.s.l, the stream drains a 30km2 area of the Northwestern part of the municipality of Saquarema, state of Rio de Janeiro and flows into the Saquarema Lago...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v58i4.5425
更新日期:2010-12-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2013-03-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:1994-08-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v64i3.21094
更新日期:2016-09-01 00:00:00
abstract::Jaguars (Panthera onca) are the largest predator in lowland forests of Amazonia but there have been few studies on their occurrence and activity in such forests. Here, we used camera traps to document the occurrence and activity of jaguars within a local area (-650ha) of lowland forest of Eastern Ecuador, over two sam...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v62i2.11115
更新日期:2014-06-01 00:00:00
abstract::Zooplankton sampling was carried out monthly from January to December 1990 at station A near the coastline, and station B near the reef barrier, in a tropical coral reef lagoon in the Mexican Caribbean Sea. Samplings were made at midnight, near surface, with a conical net (mouth 0.40 m, mesh 330 microm) for 10 min. Sa...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v57i3.5481
更新日期:2009-09-01 00:00:00
abstract::Migrating humpback whales from northern and southern feeding grounds come to the tropical waters near Osa Peninsula, Pacific of Costa Rica, to reproduce and raise their calves. Planning effective marine protected areas that encompass humpback critical habitats require data about which oceanographic features influence ...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v56i2.5610
更新日期:2008-06-01 00:00:00
abstract::The land crab Gecarcinus quadratus is an engineering species that controls nutrient cycling in tropical forests. Factors regulating their coastal distribution are not fully understood. We quantified land crab distribution during the dry season at Sirena Field Station in Corcovado National Park, Costa Rica, and found t...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v55i1.6073
更新日期:2007-03-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v60i3.1758
更新日期:2012-09-01 00:00:00
abstract::The mangrove forest that fringes the Bon Accord Lagoon measures 0.8 km(2) and is dominated by red mangrove (Rhizophora mangle). This forest forms the landward boundary of the Buccoo Reef Marine Park in Southwest Tobago, and is part of a mangrove-seagrass-coral reef continuum. Biomass and productivity, as indicated by ...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2005-05-01 00:00:00
abstract::Amazonian forests are a vast storehouse of biodiversity and function as carbon sinks from biomass that accumulates in various tree species. In these forests, the taxa with the greatest contribution of biomass cannot be precisely defined, and the representative distribution of Myristicaceae in the Peruvian Amazon was t...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2015-03-01 00:00:00