scholarly journals Advances in the Studies of the Benthic Zone

2020 ◽  
Keyword(s):  
Benthic Zone

Ecology and biology of Hydrozetes paulista (Acari: Oribatida) in the benthic zone of a temporary lake in Brazil

2018 ◽  
Vol 23 (9) ◽  
pp. 1857 ◽  
Author(s):  
Anna Seniczak ◽  
Stanisław Seniczak ◽  
Eneida M. Eskinazi Sant'anna ◽  
Emerson Dias ◽  
Radomir Graczyk ◽  
...  
Keyword(s):  
Body Size ◽  
Stage Structure ◽  
Benthic Invertebrate ◽  
Mite Species ◽  
Sample Population ◽  
Invertebrate Community ◽  
Water Parameters ◽  
Litterbag Experiment ◽  
Benthic Invertebrate Community ◽  
Benthic Zone

Oribatid mites are mainly terrestrial animals, but some are aquatic, including all species of the genus Hydrozetes (Hydrozetidae). They have often been recorded in abundance on the water’s surface, while their presence in the benthic zone is poorly documented. A litterbag experiment was carried out in Coutos Lake, a shallow temporary lake in Southeast Brazil, in order to study the ecology and biology of Hydrozetes paulista. This mite species greatly dominated the benthic invertebrate community (82%), and at the end of the experiment it reached a density (652 individuals per 1 g of dry substrate) higher than that ever previously reported before for any Hydrozetes species. This density was correlated with some water parameters, stronger with conductivity, and less with temperature. The adults dominated in the stage structure (constituting over 80% of sample population), but the participation of the juveniles increased with the time. Larvae were first noticed on 25th day of experiment and after that were present for the rest of the season. During the course of this experiment, mite fecundity and body size decreased. This species is known as bisexual, but we observed only females in the 5354 adults we collected.

Dissolved nutrients and organic particulates in water flowing over coral reefs at Lizard Island

1983 ◽  
Vol 34 (6) ◽  
pp. 835 ◽  
Author(s):  
CJ Crossland ◽  
DJ Barnes
Keyword(s):  
Organic Carbon ◽  
Coral Reefs ◽  
Organic Nitrogen ◽  
Inorganic Nitrogen ◽  
Dissolved Nutrients ◽  
Reef Complex ◽  
Nutrient Levels ◽  
Lizard Island ◽  
Nitrogen Phosphorus ◽  
Benthic Zone

Concentrations of dissolved nutrients and organic particulates were measured in seawater flowing across the windward and leeward reef flats of the lagoonal reef complex at Lizard Island. Measurements were made during the day, at night, and at various stages of the tide over a period of several weeks. The reef complex, as a whole, did not consume or export statistically significant amounts of inorganic nitrogen, phosphorus, silicate, organic nitrogen or organic carbon. Depletion or elevation of nutrient levels in one benthic zone appeared to be balanced by production or consumption in downstream zones.

scholarly journals LATE CHATTIAN LARGER FORAMINIFERA FROM THE PREBETIC DOMAIN (SE SPAIN): NEW DATA ON SHALLOW BENTHIC ZONE 23

Palaios ◽  
2017 ◽  
Vol 32 (1) ◽  
pp. 83-109 ◽  
Author(s):  
CARLES FERRÀNDEZ-CAÑADELL ◽  
TELM BOVER-ARNAL
Keyword(s):  
Larger Foraminifera ◽  
Se Spain ◽  
Benthic Zone

Advances in Understanding Landscape Influences on Freshwater Habitats and Biological Assemblages

2019 ◽  
Keyword(s):  
Unit Volume ◽  
Hyporheic Zone ◽  
Landscape Indicators ◽  
Crop Fields ◽  
Abundance Estimates ◽  
Hyporheic Zones ◽  
Freshwater Habitats ◽  
Surber Sampler ◽  
Malaise Traps ◽  
Benthic Zone

<i>Abstract.</i>—The applicability of catchment indicators for predicting aquatic invertebrate responses in both vertical and lateral dimensions of river ecosystems is poorly understood. Therefore, our objective was to determine whether landscape indicators can predict coupled benthic-hyporheic responses in river and riparian environments. To do so, we assessed the relationships between the proportion of crop fields, instream habitat conditions, and abundance of larval and adult Ephemeroptera, Plecoptera, and Trichoptera (EPT) taxa in (and from) benthic and hyporheic zones of a 15-km segment of the Satsunai River (catchment area: 725 km2), eastern Hokkaido, northern Japan. Invertebrates were collected using colonization traps (hyporheic taxa), Surber sampler (benthic taxa), and Malaise traps (adults). We first identified insect taxa belonging to each of the benthic dwellers (EPT, excluding chloroperlid Plectoptera) and hyporheic dwellers (chloroperlid Plectoptera) based on the relative unit-volume abundances in benthic zone (7-cm surficial part of riverbed) and hyporheic zone (30 and 50 cm deep). Nitrate concentration and total chlorophyll, the abundance of larval insects in both zones, and adult insects from the benthic zone increased with an increasing proportion of crop fields. In contrast, the abundance of adult invertebrates originating from the hyporheic zone maximized in the area with an intermediate proportion of crop fields. We attributed this disparity to the spatial variability in total availability of functional hyporheic habitat in a vertical dimension, which could not be explained by the abundance estimates on a unit-volume basis. Overall, the proportion of crop fields in a catchment can be used to predict numerically similar (coupled) abundance responses of EPT larvae in river benthic and hyporheic zones. Furthermore, the use of landscape indicators in predicting coupled benthic-hyporheic responses in the riparian zone can be improved with information on the vertical extent of functional hyporheic habitat.

Some Aspects of the Ecology of Lake Macquarie, N.S.W., with Regard to an Alleged Depletion of Fish. VII. The Benthic Macrofauna.

1959 ◽  
Vol 10 (3) ◽  
pp. 341 ◽  
Author(s):  
RJ MacIntyre
Keyword(s):  
Deep Water ◽  
Benthic Macrofauna ◽  
Lake Area ◽  
Anaerobic Conditions ◽  
Mollusc Species ◽  
Recent Origin ◽  
Benthic Zone

The benthic zone of Lake Macquarie, passing from shallow to deep water, consists of weed, slope, and mud zones, occupying respectively 23.5, 16.0, and 60.5 per cent. of the lake area. The biomasses of the invertebrate macrofauna of the zones are respectively 94 156 g, 180 � 12 g, and 10.6 � 9.4 g per m2. Each zone has its typical fauna. A variety of species occurs in the weed and slope zones, but only two species occur in number in the mud zone. A number of mollusc species was represented only by dead shells of recent origin, suggesting some catastrophe such as production of anaerobic conditions. There is no evidence that the mussel Trichomya hirsuta was affected, and experimentation revealed that this species can survive long periods of immersion under anaerobic conditions.

scholarly journals Bartonian orthophragminids from the Fulra Limestone (Kutch, W India) and coeval units in Sulaiman Range, Pakistan: a synthesis of shallow benthic zone (SBZ) 17 for the Indian Subcontinent

2018 ◽  
Vol 30 (1) ◽  
pp. 137-162 ◽  
Author(s):  
Ercan Özcan ◽  
Pratul Kumar Saraswati ◽  
Ali Osman Yücel ◽  
Nowrad Ali ◽  
Muhammad Hanif
Keyword(s):  
Indian Subcontinent ◽  
Benthic Zone

Acoustic phenomena related to an enriched benthic zone in the North Sea

1990 ◽  
Vol 12 (6) ◽  
pp. 1251-1261
Author(s):  
I. Sprong ◽  
B.R. Kuipers ◽  
H. Witte
Keyword(s):  
North Sea ◽  
The North ◽  
The North Sea ◽  
Benthic Zone

Bathymetric Distribution of Brittlestars (Ophiuroidea) Collected off the Northern Oregon Coast

1965 ◽  
Vol 22 (6) ◽  
pp. 1407-1424 ◽  
Author(s):  
Sergei Astrahantseff ◽  
Miles S. Alton
Keyword(s):  
Atomic Energy Commission ◽  
River Mouth ◽  
Benthic Fauna ◽  
Columbia River ◽  
Single Species ◽  
Species Number ◽  
Bathymetric Distribution ◽  
Number Of Species ◽  
Study Species ◽  
Benthic Zone

A cooperative study by the Bureau of Commercial Fisheries and the U. S. Atomic Energy Commission was undertaken to evaluate the composition of benthic fauna indigenous to waters adjacent to the Columbia River mouth. Standard stations were established by 25-fath intervals between 50 and 500 fath, and by 50-fath intervals from 500 to 1050 fath. Fifty- to 500-fath stations were monitored seasonally while sampling of deeper stations was generally restricted to spring and summer cruises.Twenty-four species of ophiuroids representing eight families and 14 genera were collected during this study. Species number varied by station ranging from one at 650 fath to a maximum of nine species at 300 fath.The number of species of ophiuroids by benthic zone showed a general increase with increasing depth. The total number of species collected by benthic zone was 4 from the sublittoral, 8 from the upper bathyal, 13 from the lower bathyal, and 15 from the abyssal. One, three, and eight species were confined to the outer sublittoral, lower bathyal, and abyssal, respectively.The highest availability of ophiuroids occurred between 150 and 250 fath and between 800 and 1050 fath. Lowest availability occurred at 125, 325, and 350 fath where few or no ophiuroids were observed. Larger catches of ophiuroids were estimated to contain from 500 to 2000 individuals. A single species, Ophiura sarsii, consistently dominated catches from 150 to 250 fath; while four species, Ophiocten pacificum, Ophiolimna bairdi, Ophiomusium lymani, and Ophiophthalmus normani, dominated catches between 800 and 1050 fath.The families Ophiuridae and Ophiacanthidae predominate in the study area. Together, they account for the majority of species collected which include the five most abundant species.The bathymetric distribution of ophiuroids from the Columbia River trackline illustrates a changing species composition with increasing depth, with the existence of both stenobathic and eurybathic species.

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