Journal of Aquatic Science

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ISSN (Online): ISSN Pending

Editor-in-Chief: Hanaa Abd El Baky

Website: http://www.sciepub.com/journal/JAS

   

Article

The Daily Light-dark Cycle of Photosynthetic Oxygen Evolution in Three Species of Tropical Calcareous Algae

1Marine Biology Section, University of San Carlos, Cebu City, Philippines


Journal of Aquatic Science. 2015, 3(1), 14-18
doi: 10.12691/jas-3-1-3
Copyright © 2016 Science and Education Publishing

Cite this paper:
Alvin P. Monotilla, Serafin M. Geson, Paul Isaac O. Dizon, Danilo T. Dy. The Daily Light-dark Cycle of Photosynthetic Oxygen Evolution in Three Species of Tropical Calcareous Algae. Journal of Aquatic Science. 2015; 3(1):14-18. doi: 10.12691/jas-3-1-3.

Correspondence to: Alvin  P. Monotilla, Marine Biology Section, University of San Carlos, Cebu City, Philippines. Email: alvinmonotilla@yahoo.co.jp

Abstract

Endogenous coordination between light, temperature and other factors by different species of algae would be vital in the production of several proteins needed for growth and adaptations, and therefore will affect their productivity. Among plant activities that are governed by daily light-dark cycles (i.e. 12L:12D and 12L:12L) among calcareous algae (Halimeda simulans, Mastophora rosea and Padina australis) were conducted by monitoring the dissolved oxygen (DO) concentration inside incubating bottles with algal samples for 24h and the features of the resulting DO curves were determined by measuring the number of pixel under the curve through image analysis. There was no significant difference among algae during the initial 12L:12D cycle suggesting their normal response to light-dark cycles. However, after six days under continuous light, M. rosea showed a significant decrease in the DO curve (lesser number of pixel under the curve) compared to DO curves during the initial 12L:12D cycle. The decrease in the DO concentration during the continuous L:L treatments might be attributed to the photoinhibitory effect of the red alga being less adoptive to subsequent high intensities. Although an increase in DO concentrations is expected with continuous light, not all algae responded to it. Only Padina exhibited circadian rhythm in our 24h observation under continuous light.

Keywords

References

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Article

Species Composition, Abundance and Distribution of Seawater Bugs (Order Hemiptera: Class Insecta) in Badian, Cebu, Philippines

1Entomological Collections, University of San Carlos, Talamban, Cebu City 6000 Philippines

2Department of Biology, University of San Carlos, Talamban, Cebu City 6000 Philippines


Journal of Aquatic Science. 2016, 4(1), 1-10
doi: 10.12691/jas-4-1-1
Copyright © 2016 Science and Education Publishing

Cite this paper:
Fidel E. Bendanillo, Rosemarie R. Yurong, Noel D. Roble, Jonie C. Yee, Filipina B. Sotto. Species Composition, Abundance and Distribution of Seawater Bugs (Order Hemiptera: Class Insecta) in Badian, Cebu, Philippines. Journal of Aquatic Science. 2016; 4(1):1-10. doi: 10.12691/jas-4-1-1.

Correspondence to: Fidel  E. Bendanillo, Entomological Collections, University of San Carlos, Talamban, Cebu City 6000 Philippines. Email: fidelbendanillo@yahoo.com

Abstract

The presence of seawater bugs in the coastal area is an indicator of good water quality and stable mangrove habitat. As energy source of other organisms, their role in the food chain (Chen et al., 2005) makes them important in the marine ecosystem. This study was conducted in order to know the species occurrence, abundance and distribution and their relationships with the physicochemical parameters such as light, humidity, temperature, pH, salinity, dissolved oxygen, nitrite, nitrate and phosphate that would affect their population to fluctuate or change. In the sampling sites, a quadrat sampling method was used for collections and gathering of data. Results indicated that 824 adult bugs composed of 4 Families, 8 Genera and 13 Species were found. The species were Halobates calyptus, Halobates hayanus, Halobates proavus, Pseudohalobates inobonto and Stenobates sangihi of the Family Gerridae; Haloveloides femoralis, Halovelia esakii, Halovelia malaya, Halovelia bergrothii, Xenobates sp. 1 and Xenobates sp. 2 of the Family Veliidae; Hermatobates marcheii of the Family Hermatobatidae and Corallocoris marksae of the Family Omaniidae. The most abundant was H. femoralis and the species were not associated each other and showed clumped pattern of distribution. Pearson's r- correlation coefficient showed that the effect of light, temperature, dissolved oxygen and phosphate level had a strong relationship with the abundance and distribution of bugs. This means that the higher the relative humidity, temperature, dissolved oxygen and phosphate concentration the higher was the number of bugs. The lower the pH, salinity, nitrate and nitrite the higher the number of seawater bugs. However, the mangrove forest in Badian is still stable.

Keywords

References

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Article

A Case Study on Fishing Gears, Fish Species Composition and Fisher Folk Community at Jamuna River of Sirajganj Sadar Fish Landing Site, Bangladesh

1Faculty of Fisheries, Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh

2Department of Fisheries Technology, Faculty of Fisheries, Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh

3Department of Aquaculture, Faculty of Fisheries, Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh

4Department of Fisheries Management, Faculty of Fisheries, Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh


Journal of Aquatic Science. 2016, 4(1), 11-19
doi: 10.12691/jas-4-1-2
Copyright © 2016 Science and Education Publishing

Cite this paper:
S.M.Majharul Islam, Md. Bokthier Rahman, Md. Rushna Alam, Biplob Dey Mithun, Anik Bal, Mehedi Azam, Mst. Ruma. A Case Study on Fishing Gears, Fish Species Composition and Fisher Folk Community at Jamuna River of Sirajganj Sadar Fish Landing Site, Bangladesh. Journal of Aquatic Science. 2016; 4(1):11-19. doi: 10.12691/jas-4-1-2.

Correspondence to: Md.  Bokthier Rahman, Department of Fisheries Technology, Faculty of Fisheries, Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh. Email: bokthierfs@gmail.com

Abstract

A profilistic study on the socio-economic status of the fishermen community of Jamuna River under Sirajganj Sadar, was conducted for a period of 1 year and 6 months from August 2014 to February 2016 by employing PRP tools. A total sample of respondent was 120 families and head of the family was considered as respondents for accuracy of information. In this investigation information on fishing gears, fish diversity and social status such as education level, religion, age, occupation, housing condition, sanitary condition, electricity facilities and other facilities was studied. The surveyed result identified total 11 types on fishing net under 5 major groups of net of which Current jal, Chandi jal under the group of Gill net and Ber jal under Seine net group was responsible for large-scale caught. A total of 55 species under 44 genera and 28 families were identified from River Jamuna in the catches of different gears. Among different families Cyprinidae contributes highest number (10 species) of species and genus (7 genera) which was followed by Schilbeidae had 4 species under 4 different genera. The socio-demographic study revealed that most of the fishermen had aged 30-50 (62%) indicated middle class family. The majority of fishers are Muslim (69%). 62% fishermen were engaged in fishing as their main occupation. But, 53% had no educational knowledge. Monthly income varied from 3-25 $ of fisher community. About 61% house had no electricity because of bad communication system. Social condition is not good because majority of them are landless. All of these situation can be promoted if the government and non-governmental organisation trying their best affort and increase their facilities among the fisher folk community of Jamuna River around Sirajgonj district.

Keywords

References

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