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Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Northern Boundary of Venezuela and Columbia

Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Northern Boundary of Venezuela and Columbia PDF Author: David Starr Jordan
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 684

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Book Description

Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Northern Boundary of Venezuela and Columbia

Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Northern Boundary of Venezuela and Columbia PDF Author: David Starr Jordan
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 684

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Book Description

Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Northern Boundary of Venezuela and Colombia

Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Northern Boundary of Venezuela and Colombia PDF Author: David Starr Jordan
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 680

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Book Description

Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Northern Boundary of Venezuela and Columbia

Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Northern Boundary of Venezuela and Columbia PDF Author: David Starr Jordan
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 670

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Book Description

Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Northern Boundary of Venezuela and Colombia

Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Northern Boundary of Venezuela and Colombia PDF Author: U.S. Fish and Wildlife Service
Publisher:
ISBN:
Category :
Languages : en
Pages : 200

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Book Description

A Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Northern Boundary of Venezuela and Columbia

A Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Northern Boundary of Venezuela and Columbia PDF Author: David Starr Jordan
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 680

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Book Description

Check List of the Fishes and Fishlike vertebrates of North and Middle America north of the northern boundary of Venezuela and Colombia. [Revised edition.] By D. S. Jordan, B. W. Evermann and H. W. Clark

Check List of the Fishes and Fishlike vertebrates of North and Middle America north of the northern boundary of Venezuela and Colombia. [Revised edition.] By D. S. Jordan, B. W. Evermann and H. W. Clark PDF Author: David Starr Jordan
Publisher:
ISBN:
Category :
Languages : en
Pages : 670

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Book Description

A Checklist of the Fishes and Fishlike Vertebrates of North and Middle America, North of Venezuela and Colombia

A Checklist of the Fishes and Fishlike Vertebrates of North and Middle America, North of Venezuela and Colombia PDF Author: David Starr Jordan
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
Listed Rhinobatos horkeli (Brazlilian Guitarfish) from Brazil to St. Eustatius, Windward Is.

Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Southern Boundary of Venezuela and Colombia

Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Southern Boundary of Venezuela and Colombia PDF Author: David Starr Jordan
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 670

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Book Description

Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Southern Boundary of Venezuela and Columbia

Check List of the Fishes and Fishlike Vertebrates of North and Middle America North of the Southern Boundary of Venezuela and Columbia PDF Author: David Starr Jordan
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 690

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Book Description

Nekton

Nekton PDF Author: Yu.G. Aleyev
Publisher: Springer Science & Business Media
ISBN: 9401013241
Category : Science
Languages : en
Pages : 430

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Book Description
1. Nekton as an ecomorphological type of biont The term nekton was suggested and used for the first time in 1890 by E. Haeckel in his book Plankton-Studien. Etymologically the word nekton derives from the Greek VTJKTTJP, i.e. swimming. As Haeckel defined it, nekton describes collectively all swimming animals that are 'free to choose their path', i.e. can resist a strong current of water and, distinct from planktonic animals, go where they wish. While giving a general idea of the dividing line between plankton and nekton, Haeckel's definition, which has played an important role in shaping our ideas about nekton, today no longer provides a sufficient basis for ecological and functional morphological investigations, since it affords no possibility of quantitatively assessing either the boundary between plankton and nekton or that between nekton and other ecomorphological types of biont. Thus Parin (1968), proceeding from Haeckel's principle, believes that in the epipelagic zone of the ocean the minimum size of nektonic fishes with a well-developed capacity for active swimming may be between 15 and 30 cm, as fishes shorter than 15 cm are unable to counter oceanic currents. Meanwhile young Leucaspius (Leucaspius delineatus) only 1.5 cm long, observed by this writer in ponds near Moscow proved capable of active horizontal migrations across the entire body of water, which, if Haeckel's definition is accepted, brings the border between planktonic and nektonic fish in this case to between 1.5 and 2.0 cm.