A FOOD WEB BIOACCUMULATION MODEL FOR ORGANIC CHEMICALS IN AQUATIC ECOSYSTEMS

2004 ◽  
Vol 23 (10) ◽  
pp. 2343 ◽  
Author(s):  
Jon A. Arnot ◽  
Frank A.P.C. Gobas
Author(s):  
Cristian A. Vargas ◽  
L. Antonio Cuevas ◽  
Humberto E. González ◽  
Giovanni Daneri

The growth rate response of bacterial communities to the potential increase of dissolved organic matter (DOM) produced by the copepod Acartia tonsa was assessed in experiments conducted in three stations representing three contrasting aquatic environments (coastal embayment, shelf and ocean). Bacterial assemblages were inoculated in filtered seawater where A. tonsa had previously grazed. Utilization of DOM over time was evaluated after the addition of bacterial inoculums as the biomass changes in both ‘control’ and ‘copepod’ treatments. In the embayment and ocean a high bacterial growth was observed in the treatments with seawater where copepod were feeding. Additional field measurements of bacterial, primary production and zooplankton biomass support the idea that bacterial communities living in oceanic environments can be efficient to utilize the newly available substrate. Copepods play a key role not only as conveyors of carbon up through the classical food-web, but also generated significant amounts of bacterial substrate in the microbial loop food-web.


2020 ◽  
Vol 9 (1) ◽  
pp. 9-12
Author(s):  
Arrico Fathur Yudha Bramasta ◽  
Wilis Ari Setyati ◽  
Ria Azizah Tri Nuraini

ABSTRAK: Zooplankton merupakan organisme laut yang memiliki peran dalam rantai makanan di laut. Zooplankton berperan pada tingkat energi kedua yang menghubungkan produsen (fitoplankton) dengan konsumen tingkat tinggi. Penelitian ini bertujuan untuk mengetahui komposisi dan struktur komunitas Arthropoda dengan dua perbedaan intensitas cahaya (300 lux dan 2000 lux). Penelitian ini dilakukan menggunakan metode purposive sampling yang terdiri dari tiga stasiun. Pengambilan sample zooplankton dilakukan dengan bantuan plankton net yang ditarik kapal tiga kali pengulangan. Berdasarkan penelitian ditemukan 5 genus yaitu Calanus, Paracalanus, Sergia, Eucalanus dan Candacia. Genus yang paling banyak ditemukan adalah Calanus dan Sergia. Kelimpahan Arthropoda tertinggi terdapat pada Stasiun 1 dengan intensitas 2000 lux sebesar 8.492 ind/L dan terendah pada Stasiun 3 dengan intensitas 300 lux sebesar 2.286 Ind/L, hal ini diduga karena pengaruh gaya fototastik positif dari fitoplankton terhadap sumber cahaya yang direspon baik oleh zooplankton khususnya Arthropoda sebagai sumber makanan. Tingkat keanekaragaman (H’) Arthropoda di perairan tersebut termasuk dalam kategori rendah, indeks keseragaman (E) dalam kategori rendah, dan terdapat dominansi (C). ABSTRACT: Zooplankton are those organisms which have a role in  food-web in aquatic ecosystems. Zooplankton as second trophic level organism whose connects producers (phytoplankton) with consumers at a higher trophic level. This research aims to know the composition and structure of the Arthropode community with two differences in light intensity (300 lux and 2000 lux). This research was done by using purposive sampling method which consists of three stations, by using a plankton net that was pulled by the boat. The results of the study found five genera namely Calanus, Paracalanus, Sergia, Eucalanus, Candacia. The most common genera are Calanus and Sergia. The highest abundance of Arthropode at Station 1 with an intensity 2000 lux is 8.492 ind/L and the lowest at Station 3 with an intensity 300 lux is 2.286 Ind/L. The level of diversity (H') of Arthropode categorized as low, the index of uniformity (E) is categorized medium, the level of dominance (C) is classified as high.


2015 ◽  
Vol 49 (21) ◽  
pp. 12832-12839 ◽  
Author(s):  
Anne M. McLeod ◽  
Gordon Paterson ◽  
Ken G. Drouillard ◽  
G. Douglas Haffner

2004 ◽  
Vol 23 (10) ◽  
pp. 2518 ◽  
Author(s):  
Theo P. Traas ◽  
Annemarie P. van Wezel ◽  
Joop L.M. Hermens ◽  
Mathilde Zorn ◽  
Albertus G.M. van Hattum ◽  
...  

2008 ◽  
Vol 22 (1) ◽  
pp. 17-25 ◽  
Author(s):  
Frank H. Gleason ◽  
Maiko Kagami ◽  
Emilie Lefevre ◽  
Telesphore Sime-Ngando

EDIS ◽  
2020 ◽  
Vol 2020 (4) ◽  
Author(s):  
Laura K. Reynolds ◽  
Carrie Reinhardt Adams ◽  
Enrique Latimer ◽  
Charles W. Martin ◽  
Christine E. Rohal ◽  
...  

Submerged aquatic vegetation has numerous benefits for aquatic ecosystems, from improving water quality to providing important habitat that supports a diverse food web. This new 6-page publication of the UF/IFAS Department of Soil and Water Sciences describes the breadth of options available to managers who wish to plant SAV at new locations. Because all methods have both benefits and drawbacks, and because all planting locations have different (often unknown) challenges for plant survival, managers may choose to try multiple methods to increase the likelihood for success. Written by Laura Reynolds, Carrie Reinhardt Adams, Enrique Latimer, Charles W. Martin, Christine Rohal, and Jodi Slater.https://edis.ifas.ufl.edu/ss685


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