The effects of haloclines on the vertical distribution and migration of zooplankton

AbstractThe investigation of the vertical distribution of the zooplankton community in the temperate Lake Trichonis during four seasons in 2005, showed the existence of vertical segregation among species, ontogenetic stages and sexes within and between the major groups. In each season, the two or three more abundant rotifer species distributed at separate depth layers, while this feature was maintained during the entire 24 h period, since no diel vertical migrations (DVM) were performed. In contrast, the crustacean community, comprised mainly by the calanoid copepod Eudiaptomus drieschi and the cladoceran Diaphanosoma orghidani, showed various patterns of DVM, being more pronounced in spring and summer. Females of E. drieschi distributed deeper than males, while the copepod nauplii were found mainly in the surface layer in all four seasons. Temperature was the most important abiotic factor affecting directly and indirectly the vertical distribution and migration of various species. During stratification, the metalimnion was the most productive layer in Lake Trichonis, having maximum values of dissolved oxygen and low transparency due to high concentration of organic matter and phytoplankton. The DVM patterns of the crustaceans indicate that the metalimnion acts probably as a daylight refuge against predation by Atherina boyeri, which is the dominant planktivorous fish in the lake.

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The Vertical Distribution and Diurnal Migration of the Crustacea Amphipoda Collected During the SOND Cruise, 1965 I. The Gammaridea

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s002531540001897x ◽

1976 ◽

Vol 56 (2) ◽

pp. 359-382 ◽

Cited By ~ 10

Author(s):

Michae L H. Thurston

Keyword(s):

Cluster Analysis ◽

Factor Analysis ◽

Vertical Distribution ◽

Canary Islands ◽

Sampling Methods ◽

Methods And Techniques ◽

Biological Sampling ◽

And Cluster Analysis ◽

And Migration ◽

The Vertical Distribution

INTRODUCTIONDetailed studies of the vertical distribution and migration of the micronekton, plankton and sonic scattering layers in an oceanic environment off Fuertaventura in the Canary Islands were made from R.R.S. ‘Discovery’ during September to December 1965. A general account, including a statement of the objectives of the cruise, has been given by Currie, Boden & Kampa (1969). Foxton (1969) has described the biological sampling methods and techniques utilized. Results of sonic scattering investigations have been published by Blaxter & Currie (1967) and Boden & Kampa (1967). The present study deals only with the pelagic amphipods, and forms a contribution to a series (Angel, 1969; Clarke, 1969b; Baker, 1970; Foxton, 1970a, b; Badcock, 1970; Roe, 1972a, b, c, d; Pugh, 1974) dealing with the distribution and migration of the major taxa sampled during the investigation. An objective summary of the plankton data utilizing factor analysis and cluster analysis has been provided by Angel & Fasham (1973, 1974).

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The Vertical Distribution of Pelagic Decapods [Crustacea: Natantia] Collected on the Sond Cruise 1965 II. The Penaeidea and General Discussion

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315400005919 ◽

1970 ◽

Vol 50 (4) ◽

pp. 961-1000 ◽

Cited By ~ 64

Author(s):

P. Foxton

Keyword(s):

Vertical Distribution ◽

North Atlantic ◽

Depth Distribution ◽

Final Part ◽

Decapod Crustaceans ◽

Eastern North Atlantic ◽

And Migration ◽

The Vertical Distribution ◽

Diurnal Migration

This paper represents the second and final part of a study of the depth distribution and diurnal migration of pelagic decapod crustaceans in an area of the eastern North Atlantic. Part I (Foxton, 1970) dealt with the Caridea; Part II now considers the Penaeidea. In the discussion the data as a whole are analysed and the resulting patterns of vertical distribution and migration discussed.

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Studies on the Fishery Management of Northern Shrimp Pandalus eous in the Waters off Noto Peninsula, the Sea of Japan. III. On the Vertical Distribution and Migration of Northern Shrimp Pandalus eous in the Waters off Noto Peninsula, the Sea of Japan.

NIPPON SUISAN GAKKAISHI ◽

10.2331/suisan.66.969 ◽

2000 ◽

Vol 66 (6) ◽

pp. 969-976 ◽

Cited By ~ 2

Author(s):

Tsutomu Sadakata

Keyword(s):

Vertical Distribution ◽

Sea Of Japan ◽

Fishery Management ◽

The Sea Of Japan ◽

Northern Shrimp ◽

And Migration ◽

The Vertical Distribution

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The Vertical Distribution and Diurnal Migration of the Crustacea Amphipoda Collected during the SOND Cruise, 1965 II. The Hyperiidea and General Discussion

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315400018981 ◽

1976 ◽

Vol 56 (2) ◽

pp. 383-470 ◽

Cited By ~ 32

Author(s):

Michael H. Thurston

Keyword(s):

Vertical Distribution ◽

Canary Islands ◽

Sampling Techniques ◽

And Migration ◽

Ring Net ◽

The Vertical Distribution ◽

Diurnal Migration

INTRODUCTIONThis paper forms the second and last part of a study of the vertical distribution and migration of pelagic Amphipoda based on material collected off Fuertaventura, Canary Islands, during the SOND Cruise in 1965. The first part (Thurston, 1976b) dealt with the Gammaridea. The data presented herein deal with the Hyperiidea, to which is added a general discussion.The background to the cruise has been given by Currie, Boden & Kampa (1969), and Foxton (1969) has described the gear and methods used. This analysis is based primarily on samples obtained from a series of 1 m2 ring-net (N 113) hauls, but has been supplemented by selected materials from modified 3 m Isaacs-Kidd Mid-water Trawl (IKMT), neuston net and 1 m2 Rectangular Mid-water Trawl (RMT 1) hauls. Thurston (1976b) has discussed the limitations of the sampling techniques as they affect the present results.

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