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.

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.

BIOLOGY AND BEHAVIOR OF ZIMMERMAN PINE MOTH, DIORYCTRIA ZIMMERMANI, IN MICHIGAN

1967 ◽  
Vol 99 (5) ◽  
pp. 529-536 ◽  
Author(s):  
R. B. Carlson ◽  
J. W. Butcher
Keyword(s):  
Life History ◽  
Vertical Distribution ◽  
Uniform Distribution ◽  
Late Summer ◽  
Head Capsule ◽  
Early Summer ◽  
Main Stem ◽  
History Of ◽  
And Behavior ◽  
The Vertical Distribution

AbstractThis paper reports on studies of biology and life history of the Zimmerman pine moth, Dioryctria zimmermani (Grote), in southern Michigan.Adults emerged during the last 3 weeks of August and eggs hatched through mid-September. Eggs were laid almost entirely on the main stem and, upon hatching, the larvae entered recesses in the bark and spun hibernacula, ostensibly without feeding.Studies on the vertical distribution of larvae and pupae showed a fairly uniform distribution over the main stem in spring and early summer. In late summer, a larger percentage was found in middle whorls.Based on head capsule measurements, it is tentatively proposed that there are six larval stadia. Occurrence of parasitism in the last larval stadia is discussed, and a new egg parasite is reported.The presence of D. abietivorella Grote in the study areas is noted, and discussed briefly.

The Vertical Distribution of Pelagic Decapods [Crustacea: Natantia] Collected on the Sond Cruise 1965 I. The Caridea

1970 ◽  
Vol 50 (4) ◽  
pp. 939-960 ◽  
Author(s):  
P. Foxton
Keyword(s):  
Vertical Distribution ◽  
Canary Islands ◽  
North Atlantic ◽  
Depth Range ◽  
Main Interest ◽  
Acoustic Characteristics ◽  
Biological Collections ◽  
Eastern North Atlantic ◽  
The Vertical Distribution ◽  
Principal Elements

This study forms a contribution to a series (Angel, 1969; Clarke, 1969; Baker, 1970; Badcock, 1970) describing the biological results of a detailed investigation of the ecology of an oceanic area located in the eastern North Atlantic, close to the island of Fuerteventura (Canary Islands). The scientific background and objectives of the investigation, conducted during September to December 1965, have been described elsewhere (Currie, Boden & Kampa, 1969). Our main interest lay in the biological composition and acoustic characteristics of sonic scattering layers, and it was therefore considered essential to sample the principal elements of the pelagic fauna within the depth range 0–1000 m in as quantitative and detailed a manner as was technically possible. The resulting biological collections represent a unique body of material, the analysis of which is directly pertinent to the vertical distribution, diurnal migration and ecological interrelationships of the mesopelagic fauna.

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.

scholarly journals Methods of sampling benthic invertebrates in lotic habitats: a spatial and temporal evaluation

2019 ◽  
Vol 31 ◽  
Author(s):  
Larissa Lima da Cunha ◽  
Maria Ines Bulgari Alves ◽  
Erika Ramos Ono ◽  
Virginia Sanches Uieda
Keyword(s):  
Benthic Invertebrates ◽  
Aquatic Ecosystems ◽  
Riparian Vegetation ◽  
Benthic Fauna ◽  
Temporal Variations ◽  
Spatial And Temporal Variation ◽  
Definition Of ◽  
Number Of Individuals ◽  
Surber Sampler

Abstract Aim We compared the effectiveness of two sampling devices, the Surber sampler and the D-frame net, commonly used in the analysis of invertebrate fauna structure in biomonitoring programs. These programs use the response of benthic invertebrates to assess changes in aquatic ecosystems because they respond quickly to spatial and temporal variations. However, the lack of consensus on the best method of sampling the fauna may reduce the quality of these studies. Methods We evaluated both devices in four structurally different reaches of streams, two in places with preserved riparian vegetation and two occurring in places with many anthropic disturbances. We repeated the analysis at the dry season of two consecutive years. Results The two samplers were equally effective in analyzing the benthic fauna and sensitive enough to identify spatial and temporal variation in the structure of this fauna, influenced by the presence or absence of riparian vegetation, by the position of the reach with this vegetation (upstream or downstream of the reach without vegetation) and the characteristics of the substrate. Conclusions The analyzed fauna structure was similar for the two samplers, but we consider the use of Surber more advantageous and effective because it collects a smaller number of individuals, reducing the time of processing and identifying in the laboratory, and allows a better definition of the area sampled.

scholarly journals Community structure and vertical distribution of oncaeid copepods in Tosa Bay, southern Japan

2009 ◽  
Vol 89 (3) ◽  
pp. 491-498 ◽  
Author(s):  
Yuichiro Nishibe ◽  
Yuuichi Hirota ◽  
Hiroshi Ueda
Keyword(s):  
Community Structure ◽  
Vertical Distribution ◽  
Water Column ◽  
Distribution Patterns ◽  
Depth Range ◽  
Tosa Bay ◽  
Southern Japan ◽  
Hydrographic Conditions ◽  
Epipelagic Zone ◽  
The Vertical Distribution

Community structure and vertical distribution of oncaeid copepods were investigated at an offshore site in Tosa Bay, southern Japan. Samples were collected with a 0.063 mm closing type net from eight discrete layers between the surface and 500 m depth in August and November 2005. A total of 45 species and three form variants belonging to the genera Triconia, Oncaea, Spinoncaea, Conaea and Epicalymma were identified. The greatest number of species was consistently found in the lower epipelagic zone, at 50–100 m. The vertical distribution patterns of oncaeid copepods were similar between August and November, with the highest abundances in the upper epipelagic zone above the thermocline. The oncaeid maxima corresponded with the depth where appendicularians occurred in high numbers. Dominant species in the water column (0–500 m) were O. venusta small form, O. media, O. scottodicarloi, O. waldemari, O. zernovi, O. tregoubovi, S. ivlevi, S. tenuis and T. conifera. The vertical succession of species composition was almost the same between August and November, although several species showed a downward shift of their depth-range to some extent in November. The oncaeid copepod community could be differentiated into three distinct groups according to the depth layers, each corresponding to different hydrographic conditions in the water column.

The seasonal cycles and vertical distribution of tintinnines in Bedford Basin, Nova Scotia, Canada

1987 ◽  
Vol 65 (1) ◽  
pp. 41-48 ◽  
Author(s):  
Madhu A. Paranjape
Keyword(s):  
Nova Scotia ◽  
Vertical Distribution ◽  
Seasonal Cycle ◽  
Late Summer ◽  
Survival Strategies ◽  
Late Winter ◽  
Seasonal Cycles ◽  
The Vertical Distribution ◽  
Fixed Station

The vertical distribution and seasonal cycle of tintinnine species were studied in Bedford Basin at a fixed station on 60 visits over an 18-month period. About 23 species of tintinnines belonging to 9 families were identified but only 12 were numerically dominant. Maximal numbers (102 to 104/L) were found in late summer and fall and minimal numbers (101 to 102/L), in late winter. The hyaline species of tintinnines occurred mostly in summer and fall, while agglomerated species dominated during other seasons. The total tintinnines contributed 35% (range, 3 to 55%) numerically and 2.5% (range, 0.05 to 16%) in terms of carbon to the microzooplankton in the Bedford Basin. The survival strategies employed by some species of tintinnines reasonably explain their seasonal cycle of abundance.

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