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Author: Kristine Idda P. Pontillas
Publisher:
ISBN:
Category :
Languages : en
Pages : 103
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Book Description
Harpacticoid copepod fauna have been the subject of very limited taxonomic research for over the past thirty years. Moreover, the huge discrepancy in the number of studies on harpacticoids in freshwater is heavily outweighed by those in marine waters. This study presents new data on the taxonomy, ecology, and distribution of benthic harpacticoids belonging to the families Laophontidae, Ameiridae, Harpacticidae, and Canthocamptidae, all of them collected from a freshwater, Lake Taal in Batangas, Philippines. Their taxonomy has been studied using scanning electron microscopy. Folioquinpeschathamensis, has been collected in littoral and limnetic areas. The species is characterized by presence of primitive inner proximal seta on the female and male P3 ENP2. Nitokravietnamensis, collected in open waters with average depth of 20 m, is being characterized by a character combination of six setae on the ellipsoidal exopod of leg 5 in both sexes, the first endopodal segment of leg 1 shorter than the whole exopod, the seta/spine armature of an inner seta of P2-‐P4 enp-‐1 and four elements on P2 enp-‐3, and the reduction of the proximal endite to a seta on the maxillary syncoxa. Harpacticella oceanica, the most abundant, has been cored from mostly in littoral areas. Mesochrameridionalis, a species belonging to the largest family, has been collected also mostly in littoral waters. The characteristic features of this species are the 2-‐segmented condition in the endopods of P2-‐P4 in females while the P3 shows endopod 3-‐segmented with an apophysis on the 2nd segment and 2 setae on the 3rd segment of males. Most species except F. chathamensis are found to be occurring in marine waters and there were no reported data on where these 3 species have been collected in the Philippines. This study suggests that genera Nitokra, Harpacticella, and Mesochra seem to be very adaptable implying that these have survived and thriving in freshwater when they are only known to occur in marine conditions.
Author: Kristine Idda P. Pontillas
Publisher:
ISBN:
Category :
Languages : en
Pages : 103
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Book Description
Harpacticoid copepod fauna have been the subject of very limited taxonomic research for over the past thirty years. Moreover, the huge discrepancy in the number of studies on harpacticoids in freshwater is heavily outweighed by those in marine waters. This study presents new data on the taxonomy, ecology, and distribution of benthic harpacticoids belonging to the families Laophontidae, Ameiridae, Harpacticidae, and Canthocamptidae, all of them collected from a freshwater, Lake Taal in Batangas, Philippines. Their taxonomy has been studied using scanning electron microscopy. Folioquinpeschathamensis, has been collected in littoral and limnetic areas. The species is characterized by presence of primitive inner proximal seta on the female and male P3 ENP2. Nitokravietnamensis, collected in open waters with average depth of 20 m, is being characterized by a character combination of six setae on the ellipsoidal exopod of leg 5 in both sexes, the first endopodal segment of leg 1 shorter than the whole exopod, the seta/spine armature of an inner seta of P2-‐P4 enp-‐1 and four elements on P2 enp-‐3, and the reduction of the proximal endite to a seta on the maxillary syncoxa. Harpacticella oceanica, the most abundant, has been cored from mostly in littoral areas. Mesochrameridionalis, a species belonging to the largest family, has been collected also mostly in littoral waters. The characteristic features of this species are the 2-‐segmented condition in the endopods of P2-‐P4 in females while the P3 shows endopod 3-‐segmented with an apophysis on the 2nd segment and 2 setae on the 3rd segment of males. Most species except F. chathamensis are found to be occurring in marine waters and there were no reported data on where these 3 species have been collected in the Philippines. This study suggests that genera Nitokra, Harpacticella, and Mesochra seem to be very adaptable implying that these have survived and thriving in freshwater when they are only known to occur in marine conditions.
Author: Taisoo Park
Publisher: Univ of California Press
ISBN: 0520916026
Category : Science
Languages : en
Pages : 284
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Book Description
In this revision of the calanoid copepod family Heterorhabdidae, 7 genera and 59 species are recognized, and 25 species are described as new. Included are keys to the genera and descriptions and illustrations of all species. A hypothesis of phylogenetic relationships is presented, and the geographic distribution of the species is discussed.
Author: Dino T. Tordesillas
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
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Book Description
More than three decades have passed since the most comprehensive study on Philippine zooplankton in 1978, which recorded five species of calanoid copepods. This study is an attempt to update the calanoid copepod records of the country and document changes in species composition and distribution. Twenty seven freshwater lakes were included in this study and five calanoid species were also identified, only two of which were identified in the 1978 study. Members of genus Tropodiaptomus and the rare endemic Filipinodiaptomus insulanus were no longer collected. Incidentally, a neotropical calanoid, Arctodiaptomus dorsalis, was recorded in 19 of the 27 lakes, indicating an invasion of this alien species. With these new records, a significant difference in calanoid taxonomy and distribution has occurred within the past three decades. Increased eutrophication, whether natural or anthropogenic, and the presence of invasive species have contributed in the decline of calanoid species richness and the displacement of other calanoids. Further studies should include smaller bodies of freshwater and the use of more updated equipment for sampling and analysis.
Author: Shea Kathleen P. Guinto
Publisher:
ISBN:
Category :
Languages : en
Pages : 89
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Book Description
Freshwater calanoid copepod taxonomy in the Philippines have been poorly studied since the 1970’s leading to a significant information gap on the current species present in the country and their correct identification due to the lack of valuable taxonomic descriptions. Two Philippine endemic species, Pseudodiaptomus brehmi Kiefer, 1938 currently located in Lake Taal, Batangas, and Diaptomus vexillifer Brehm, 1933 currently located only in Lake Danao, Leyte are described in the study. Morphological remarks are presented in the form of line drawings and scanning electron micrographs of taxonomically informative characters. An updated key to the Philippine freshwater calanoida is also presented. With its current presence in Lake Taal and the construction of an updated and more detailed account of its taxonomic characters, a neotypification of the said species is now proposed for an existing type specimen has not been found since its original description. Furthermore, the availability of an extensive description of D. vexillifer has made possible the confirmation of its taxonomic status and a new combination is now proposed resulting to Filipinodiaptomus vexillifer (Brehm, 1933).
Author: Teodora U. Bagarinao
Publisher:
ISBN:
Category : Milkfish
Languages : en
Pages : 104
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Book Description
Author: C. Max Finlayson
Publisher: Springer Nature
ISBN: 3030334244
Category : Science
Languages : en
Pages : 451
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Book Description
This book chronicles the decades-long work of studying, analyzing, and reversing the environmental pressures that threatened India’s Chilika Lagoon, the largest brackish-water lagoon in the region, and the second largest in the world. Designated as one of India’s first Ramsar Sites in 1981, Chilika Lagoon continued to degrade for a decade longer. Then, the Chilika Development Authority (CDA) was established to gather information and devise a restoration plan that benefits the ecosystems of the lagoon, with sensitivity to the needs and livelihoods of local communities. Expert contributors detail the work of analysis, planning and implementation, including extensive coverage of such topics as: Devising a plan for implementing Ramsar wise use guidelines Sedimentologic, chemical, and isotopic impacts Hydrodynamics and salinity Runoff and sediment in watersheds of the Lagoon's Western Catchment Long-term analysis of water quality and continued water quality monitoring Bio-optical models for cyclone impact assessment Studies of geomorphology, land use, and sedimentary environments Spatiotemporal assessment of phytoplankton communities Creation of a post-restoration scenario for fish and fisheries Assessing status of waterbirds, species diversity and migration patterns The result was a major hydrological intervention to re-establish hydrological and salinity regimes, biodiversity, and fish catches, and help protect the livelihood of lagoon-dependent communities. The story of the rehabilitation and management of Chilika Lagoon demonstrates that it is possible to halt and reverse the encroachment and degradation of wetlands, to restore biodiversity and to provide benefits for large numbers of people. Ecology, Conservation, and Restoration of Chilika Lagoon goes beyond scientific research articles to explore institutional and governance issues, political ecology, and the Ramsar Convention’s guidelines for ecosystem restoration. The book will benefit researchers, wetland managers, government policy makers and more general readers concerned with restoration and conservation of wetlands around the planet.
Author: Unesco
Publisher: Bernan Press(PA)
ISBN:
Category : Science
Languages : en
Pages : 186
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Book Description
Author: La-Orsri Sanoamuang
Publisher: Springer Science & Business Media
ISBN: 940100756X
Category : Science
Languages : en
Pages : 394
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Book Description
This volume is a record of the proceedings of the IXth International Rotifer Symposium, which was held in Khon Kaen, Thailand, on January 16-23, 2000. The symposium was the first meeting of the international group of rotifer researchers held in Asia. The volume contains reviews and research papers dealing with diverse aspects of scientific research related to Rotifera and their ecology. Some of the topics addressed are: taxonomy and zoogeography, ecology, phylogeny and evolution, physiology, biochemistry and population genetics, aquaculture, and ecotoxicology. This book is special because it contains a unique compilation of contemporary rotifer-related research, and is the eighth of a series of rotifer symposium proceedings published in Developments of Hydrobiology. This update of Rotifera studies will be of great interest to invertebrate zoologists, hydrobiologists, ecologists, and aquaculturists, particularly those interested in freshwater habitats.
Author: Chu T. Hoanh
Publisher: CABI
ISBN: 1845936183
Category : Science
Languages : en
Pages : 495
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Book Description
Coastal deltas represent one of the most diverse biophysical regions in the tropical developing world. These regions are also home to large human populations and are significant areas of agricultural production and industrialization. Tropical deltas currently face a number of environmental pressures stemming from their intensive use and rapid development, and new threts are emerging as a result of global climate change and expected sea-level rise. Focusing on the developing countries of Asia, Africa and South America, chapters explore the impact of development strategies and existing land and water management practices on delta environments. New management techniques are also explored, which address conflicts between rice-based agriculture, aquaculture, fisheries, and the emerging threat of climate change. Illustrating the current key management challenges involved in protecting tropical deltaic systems in the face of environmental change, this book will be an essential reference for students, researchers and policy makers in agriculture, environmental science and aquaculture.
Author: Thomas F. Nalepa
Publisher: CRC Press
ISBN: 9780873716963
Category : Science
Languages : en
Pages : 848
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Book Description
The introduction and rapid spread of the zebra mussel in North American waters has caused great concern among industrial and recreational users of these waters. This bivalve mollusk is a biofouler that attaches to any firm substrate (e.g. rocks, piers, water intake pipes, boat hulls) and has already created significant problems for raw water users such as water treatment plants and power plants. Zebra Mussels: Biology, Impacts and Control provides essential information regarding the biology of the zebra mussel in North America and Europe, presents case studies of environmental and industrial impacts, and outlines control strategies. Summary articles detail its life history, origins, and morphology. The book also examines techniques used to culture and maintain this organism in the laboratory. Thirty-two color plates illustrate some of the dramatic problems created by the explosive population growth of this species. Zebra Mussels: Biology, Impacts, and Control is an important resource for ecologists, conservationists, environmental consultants, water quality engineers, regulatory officials, power utilities, and libraries.
