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Morphometric relationships and reproductive maturation of the mudskipper, Periophthalmus barbarus from subsistence catches in the mangrove swamps of IMO estuary, Nigeria

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Journal of Environmental Sciences 2002年第2期14卷 221-226页

作者： MFON T. UDO (Department of Fisheries and Aquaculture, Faculty of Agriculture, University of Uyo, PMB 1017, Akwa Ibom State, Nigeria. Department of Fisheries and Aquaculture Faculty of Agriculture University of Uyo PMB 1017 Akwa Ibom State Nigeria

From April 1992 and March 1993, morphometric characteristics and reproductive maturation were studied in Periophthalmus barbarus from subsistence catches in the mangrove swamps of Imo estuary. Morphometric equations for males and females at different stages of ovarian maturation are presented. Generally males were significantly heavier in weight than females, but the latter were heavier than the former of the same body length. Females with developing and mature ovaries were generally heavier than immature females of the same length. Analyses of the gonadosomatic index and percentage of mature males and females indicate all year\|round breeding such that: February\|May was spawning, June\|October postspawning and November to January recovery period. Fecundity varied between 900 and 23933 eggs per spawn and increased with fish size.

关键词： periophthalmus barbarus morphometric relationships reproductive maturation mangrove swamps Imo estuary Nigeria

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Heavy metals,polycyclic aromatic hydrocarbons and organochlorine pesticides in the surface sediments of mangrove swamps from coastal sites along the Leizhou Peninsula,South China

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Acta Oceanologica Sinica 2008年第1期27卷 42-53页

作者： TANG Yijie FANG Zhanqiang YU Shixiao State Key Labrabory of Biocontrol Department of Ecology School of Life Science Sun Yat-sen University Guangzhou512075 China School of Life Science South China Normal University Guangzhou 510631 China Department of Biology Guangdong Education Institute Guangzhou 510303 China

Contents of heavy metals, polycyclic aromatic hydrocarbons （PA Hs）, dichlorodiphenyltrichloroethanes （DDTs） and hexachlorcy- clohexanes （HCHs） in surface sediments from mangrove areas of the Leizhou Peninsula were analyzed in July and November 2005. Risk assessment criteria applied by Long E R et al. （1995） and Long E D et al. （1995）（effects range low, ERL; effects range mean, ERM） of chemicals in sediments from the gulf or estuary were used to assess the potential ecological risks of heavy metals, PAHs, DDTs and HCHs to aquatic organisms in the studied area. The results indicated that the average contents of zinc, nickel, chromium, lead, copper, arsenic and mercury were （61.97 ± 55.87）, （59.99 ± 39.01 ）, （47.93 ± 28.37）, （26.64± 13.00） , （23.45 ± 41.96）, （9.32 ± 3.62）, （0.14 ± 0.18） mg/kg in dry weight in the sediment samples col- lected from five studied sites in the Leizhou Peninsula, respectively. Cadmium was not calculated due to its content being below the detection limit （〈 0.3 mg,/kg）. The average levels of Cr, Cu, Ni, Pb, Zn and Hg exceed their background values. The average contents of Ni were higher than ERM. The contents of PAHs in the sediments from the five studied sites were （79.78 ± 43.70） ng/g in dry weight, far lower than ERL（4 022 ng/g）. The contents of DDE, DDD and DDTs in the sediments from five studied sites were （2.60 ± 4.68）, （ 17.52 ± 27.25 ）, （27.78 ± 46.64） ng/g in dry weight respectively, clearly higher than ERL, and the average contents of DDT were （7.66 ± 15.93） ng/g in dry weight, much higher than ERM. HCHs could be detected in the sediments only from Gaoqiao sampling site, with the average contents （0.07 ± 0.08） ng/g in dry weight.

关键词： sediment mangrove swamps heavy metals PAHs DDTs HCHs

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Isolation of Marine Actinomycetes from the mangrove swamps for Biotechnological Exploration

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Journal of Life Sciences 2011年第12期5卷 1030-1036页

作者： Rajesh C. Patil Abhishek D. Mule Gajanan V. Mali Rajmahammad R. Tamboli Rahul M. Khobragade Sanjay K. Gaikwad Vasanti I. Katchi Dhanashree Patil Bhavan＇s College Andheri （w） Mumbai 400058 India Department of Microbiology M.B.S.K. Kanya Mahavidyalay Kadegaon Sagli 415304 India Department of Microbiology M.U. Mahavidyalaya Udgir Latur 413512 India Department of Microbiology Dr. Babasaheb Ambedkar Marathawada University Sub-campus Osmanabad 431001 India Department of Cell ＆ Molecular Biology Rajiv Gandhi Institute of IT and Biotechnology Bharati Vidyapeeth Pune 411043 India Gopal Krishna College Kolhapur 416011 India

The mangroves are specialized marine environments widely distributed along the coast lines, which support biologically diverse groups of organisms including microbes. The microorganisms present in this ecosystem contribute significantly in the food web of the tropical marine ecosystem. In the present investigation, Actinomycete isolates obtained from mangrove sediments have been studied for diversity as well as for their bioactive potential. Seven different Actinomycete isolates （MS 1-MS7） were obtained from the sediments collected from the mangrove swamps. The phylogenetic analysis of these isolates showed that out or seven isolates, 3 isolates belong to Streptomyces sp., which has bioactive potential as several bioactive metabolites have been isolated from this group. One bacterium showed genetic similarity with Corynebacterium sp.. The microbes from this group are used for very important industrial applications. Three Actinomycete isolates showed very low similarity with the reported strains from the gene bank. In suggests that, these cultures could be novel and further research work is warranted to prove this speculation. In antagonistic studies, three Actinomycete isolates showed promising results. This investigation highlights the importance of mangrove ecosystem as a rich source of diverse Actinomycete strains for biotechnological applications.

关键词： Actinomycetes mangrove swamps phylogenetic analysis bioactivity.

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