A Modified Freeze-Core Technique to Quantify the Depth Distribution of Fauna in Stony Streambeds

1983 ◽  
Vol 40 (5) ◽  
pp. 637-643 ◽  
Author(s):  
C. W. Pugsley ◽  
H. B. N. Hynes
Keyword(s):  
Vertical Distribution ◽  
Liquid Nitrogen ◽  
Benthic Invertebrates ◽  
Depth Distribution ◽  
Sampling Methods ◽  
Freezing Front ◽  
Southern Ontario ◽  
Freeze Core ◽  
Order Of Magnitude ◽  
The Vertical Distribution

A freeze-coring device using liquid nitrogen is described, which enables one person to take a columnar core, extending from the surface to at least 50 cm below a stony streambed. An experiment to validate the technique showed that animals did not flee from the advance of the freezing-front. Using frozen streambed cores, the vertical distribution of benthic invertebrates of two streams in southern Ontario was investigated. In contrast to previous estimates,~70% of the fauna was found in the top 10 cm of the streambed, and invertebrate densities were often lower by an order of magnitude. These differences are attributed to problems of quantifying previous sampling methods.

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

1976 ◽  
Vol 56 (2) ◽  
pp. 359-382 ◽  
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).

Modifications in Sampling Procedures as Applied to Studies on the Bacteria and Tubificid Oligochaetes Inhabiting Aquatic Sediments

1969 ◽  
Vol 26 (10) ◽  
pp. 2581-2593 ◽  
Author(s):  
R. O. Brinkhurst ◽  
K. E. Chua ◽  
E. Batoosingh
Keyword(s):  
Spatial Distribution ◽  
Vertical Distribution ◽  
Benthic Invertebrates ◽  
Standing Stock ◽  
Basic Design ◽  
Size Limitation ◽  
Multiple Unit ◽  
Bottom Sampling ◽  
Sampling Procedures ◽  
The Vertical Distribution

The KB corer has many advantages over other bottom-sampling devices including some other coring tubes. It may be used to obtain reliable estimates of the standing stock of benthic invertebrates inhabiting soft sediments and of their spatial distribution in lakes and rivers. It may also be used for studies of the vertical distribution of animals and bacteria, and could be used for a wide variety of studies on sediments. Multiple-unit versions have been built and operated, thus overcoming the size limitation imposed by the basic design. This paper communicates some results obtained using this sampler.

CONGENERIC OCCURRENCES OF SPECIES OF DIAPTOMUS IN SOUTHERN ONTARIO LAKES

1967 ◽  
Vol 45 (1) ◽  
pp. 81-90 ◽  
Author(s):  
F. H. Rigler ◽  
R. R. Langford
Keyword(s):  
Vertical Distribution ◽  
Calanoid Copepods ◽  
Southern Ontario ◽  
Ecological Separation ◽  
The Difference ◽  
Limnocalanus Macrurus ◽  
The Vertical Distribution

The vertical distribution of adult calanoid copepods was studied in 100 lakes in southern Ontario. In addition to Epischura lacustris, Limnocalanus macrurus, and Senecella calanoides, seven species of Diaptomus were recorded. Diaptomus minutus and D. oregonensis, the commonest species, coexisted in 45% of the lakes. In 9% a third species was also present. Coexisting populations of D. minutus and D. oregonensis were not well separated by their vertical distribution, but a third species, if present, occurred in deeper water than these two. Size displacement does not contribute to the ecological separation of D. minutus and D. oregonensis. The difference in size between populations coexisting in the same lake is less than between populations living in separate lakes.

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

1970 ◽  
Vol 50 (4) ◽  
pp. 961-1000 ◽  
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.

Vertical distribution of Benthic Invertebrates in the Bed of the Thomson River, Victoria

1988 ◽  
Vol 39 (6) ◽  
pp. 775 ◽  
Author(s):  
R Marchant
Keyword(s):  
Vertical Distribution ◽  
Benthic Invertebrates ◽  
Benthic Fauna ◽  
Late Summer ◽  
Sample Surface ◽  
Depth Range ◽  
The Vertical Distribution ◽  
Surber Sampler

The vertical distribution of the benthic fauna was studied at three sites on the Thomson River using a freeze-corer. Samples were taken over two years in early and late summer. At each site an average of 72 to 84% of the fauna was found in the 0-10 cm zone of the riverbed, 10-20% in the 10-20 cm zone and 6-8% in the 20-30 cm zone; flooding at one site was followed by an increase in the depth to which the fauna penetrated. Surface percentage abundances were probably underestimated because of the inability of the corer to sample surface rocks and their fauna consistently and because the coring operation disturbs the surface fauna to some extent before it can be frozen. Nevertheless, the results indicate that in the Thomson River the majority of the fauna is within the depth range (0-10 cm) of a Surber sampler.

scholarly journals Metazooplankton diversity, community structure and spatial distribution across the Mediterranean Sea in summer: evidence of ecoregions

2011 ◽  
Vol 8 (2) ◽  
pp. 3081-3119 ◽  
Author(s):  
A. Nowaczyk ◽  
F. Carlotti ◽  
D. Thibault-Botha ◽  
M. Pagano
Keyword(s):  
Vertical Distribution ◽  
Mediterranean Sea ◽  
Mesh Size ◽  
Specific Pattern ◽  
Strongly Correlated ◽  
Western Basin ◽  
Order Of Magnitude ◽  
The Mediterranean ◽  
Abundance And Diversity ◽  
The Vertical Distribution

Abstract. The diversity and distribution of metazooplankton across the Mediterranean Sea was studied along a 3000 km long transect from the eastern to the western basins during the BOUM cruise in summer 2008. Metazooplankton were sampled using both a 120 μm mesh size bongo net and Niskin bottles at 17 stations. Here we report on the stock, the composition and the structure of the metazooplankton community. The abundance was 4 to 8 times higher than in several previously published studies, whereas the biomass remained within the same order of magnitude. An eastward decrease in abundance was evident, although biomass was variable. Spatial (horizontal and vertical) distribution of metazooplankton abundance and biomass was strongly correlated to chlorophyll-a concentration. In addition, a clear association was observed between the vertical distribution of nauplii and small copepods and the depth of the deep chlorophyll maximum. The role of environmental factors is also discussed. Cluster analysis allowed us to define a regionalization of the Mediterranean Sea based on the abundance and diversity of metazooplankton. We found a north-south distinction in the western basin and a longitudinal homogeneity in the eastern basin. The Sicily Channel appeared as an intermediate region. The specific pattern of distribution of remarkable species was also described.

scholarly journals Distribution of epipelagic metazooplankton across the Mediterranean Sea during the summer BOUM cruise

2011 ◽  
Vol 8 (8) ◽  
pp. 2159-2177 ◽  
Author(s):  
A. Nowaczyk ◽  
F. Carlotti ◽  
D. Thibault-Botha ◽  
M. Pagano
Keyword(s):  
Vertical Distribution ◽  
Mediterranean Sea ◽  
Mesh Size ◽  
Strongly Correlated ◽  
Deep Chlorophyll Maximum ◽  
Specific Distribution ◽  
Order Of Magnitude ◽  
The Mediterranean ◽  
The Vertical Distribution ◽  
Horizontal And Vertical Distribution

Abstract. The diversity and distribution of epipelagic metazooplankton across the Mediterranean Sea was studied along a 3000 km long transect from the eastern to the western basins during the BOUM cruise in summer 2008. Metazooplankton were sampled using both a 120 μm mesh size bongo net and Niskin bottles in the upper 200 m layer at 17 stations. Here we report on the stock, the composition and the structure of the metazooplankton community. The abundance was 4 to 8 times higher than in several previously published studies, whereas the biomass remained within the same order of magnitude. An eastward decrease in abundance was evident, although biomass was variable. Spatial (horizontal and vertical) distribution of metazooplankton abundance and biomass was strongly correlated to chlorophyll-a concentration. In addition, a clear association was observed between the vertical distribution of nauplii and small copepods and the depth of the deep chlorophyll maximum. The distinction between the communities of the eastern and western basins was clearly explained by the environmental factors. The specific distribution pattern of remarkable species was also described.

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