scholarly journals A contribution to the fauna of freshwater Bivalvia of waterbodies and watercourses of the Eastern slope of the Polar and Pre-Polar Urals

2020 ◽  
Vol 30 (3) ◽  
pp. 135-147
Author(s):  
S. I. Andreeva ◽  
N. I. Andreev ◽  
E. S. Babushkin
Keyword(s):  
Spatial Distribution ◽  
Stomach Contents ◽  
Check List ◽  
Eastern Slope ◽  
Qualitative And Quantitative ◽  
Polar Urals ◽  
Freshwater Clams ◽  
Water Courses ◽  
Fish Stomach

The article is devoted to the fauna of Bivalvia (family Sphaeriidae) of waterbodies and water-courses of the eastern slope of the Polar and Pre-Polar Urals. The fauna of freshwater clams of this region remains practically unexplored. This study aimed at identification of the species content of Bivalvia and publication of images of their shells. We analyzed both qualitative and quantitative samples of molluscs as well as fish stomach contents. The identification of the material was based on conchological features, including the hinge structure. In total, 31 sphaeriid species is reported, and the annotated check-list, brief zoogeographic characteristics of the fauna, and shell images are provided. Most species demonstrate a limited spatial distribution within the studied area. The causes of discrepancies between published lists of sphaeriid species are discussed.

scholarly journals 3D lithostratigraphic model of the Paleogene of the onshore part of the Moesian Platform (Northeast Bulgaria)

2018 ◽  
Vol 47 (1) ◽  
pp. 23-36
Author(s):  
Boris Valchev ◽  
Dimitar Sachkov ◽  
Sava Juranov
Keyword(s):  
Spatial Distribution ◽  
Sedimentary Rocks ◽  
Eastern Slope ◽  
The South ◽  
The North ◽  
Lithostratigraphic Units ◽  
Moesian Platform ◽  
Regional Tectonic ◽  
Model Database ◽  
The Individual

The Paleogene sedimentary rocks in the north-easternmost part of the territory of Bulgaria have been penetrated by numerous boreholes. In terms of regional tectonic zonation, the study area is a part of the onshore sector of the Moesian Platform, which partly includes the South Dobrogea Unit and the easternmost part of the North Bulgarian Dome with its eastern slope. The lithostratigraphy of the Paleogene successions consists of six formal units (the Komarevo, Beloslav, Dikilitash, Aladan, Avren, and Ruslar formations) and one informal unit (glauconitic marker). For compiling an overall conception of the regional aspects (lithology, thickness, spatial distribution, and relationships) of the individual lithostratigraphic units and for illustration of their spatial distribution, a 3D lithostratigraphic model based on reinterpretation of individual borehole sections has been created. The model database was compiled by integration of the original lithological data from 338 borehole sections.

scholarly journals A qualitative and quantitative comparison of mite fauna between bifenthrin-treated and non-pesticide treated alfalfa hay fields in Central Greece

2020 ◽  
Vol 13 (1) ◽  
pp. 29-41
Author(s):  
E.G. Badieritakis ◽  
A.A. Fantinou ◽  
N.G. Emmanouel
Keyword(s):  
Spatial Distribution ◽  
Species Richness ◽  
New Record ◽  
Seasonal Fluctuation ◽  
Quantitative Comparison ◽  
Similar Species ◽  
Qualitative And Quantitative ◽  
Central Greece ◽  
Alfalfa Hay ◽  
Over Time

SummaryThe mite fauna in foliage and litter of a sprayed alfalfa hay field with the acaricide-insecticide bifenthrin, was studied based on monthly samplings from foliage and litter in Central Greece between 2008–2009. Potential differentiations between this field and two adjacent alfalfa hay fields, which were not subjected to pesticide applications and were managed with different number of cuttings, were also evaluated in terms of population fluctuation over time, population density, species richness, diversity and spatial distribution. The sprayed field hosted 50 and 68 species and morphospecies in foliage and litter respectively, depicting high relative abundance of oribatid and prostigmatic mites. Neoseiulus aristotelisi Papadoulis, Emmanouel and Kapaxidi, was a new record for alfalfa, previously found in rice in Macedonia, Greece. The seasonal fluctuation of mites, particularly in foliage, was similar in all fields. The spatial distribution of a Zygoribatula species, which was common and dominant in all fields, was also aggregated. Finally, the sprayed field shared similar mite diversity with the two non-sprayed fields, but not similar species richness.

The Guts to Estimate Fish Daily Ration

1993 ◽  
Vol 50 (9) ◽  
pp. 1969-1975 ◽  
Author(s):  
Daniel Boisclair ◽  
François Marchand
Keyword(s):  
Digestive Tract ◽  
Significant Influence ◽  
Stomach Contents ◽  
Fold Increase ◽  
Daily Ration ◽  
Estimation Model ◽  
Evacuation Rate ◽  
Fish Stomach

We compared daily ration values estimated using the Elliott and Persson and the Eggers models implemented with field-derived variations in stomach and complete digestive tract (CDT) contents of fish. Stomach evacuation rate (0.31∙h−1) was 2.8 times greater than that of CDT (0.11∙h−1). Daily rations obtained using both models and sections of the digestive tract estimated at 2-h intervals averaged 0.84 (Trial 1), 2.56 (Trial 2), and 2.41 g dryl∙100 g wet−1∙d−1 (Trial 3) and never differed by more than 23.6% within trials (average = 11.4%). Variances in daily ration values from the Elliott and Persson model were, on average, 3.4 times larger than variances derived using Eggers model. Variances associated with daily rations on stomach contents were, on average, 5.9 times larger than variances based on CDT contents. Sampling frequencies (from 2- to 4-, 6-, 8-, and 12-h intervals) had no significant influence on mean daily ration values but, on average, caused a 3.6-fold increase in variances. The precision and robustness of daily ration values appeared more directly influenced by the section of digestive tract used than by the estimation model chosen; the Eggers model implemented with CDT contents appeared to be the most efficient combination.

Feeding in a Nocturnally active fish, Galaxias brevipinnis, in a New Zealand stream

1989 ◽  
Vol 40 (3) ◽  
pp. 231 ◽  
Author(s):  
GJ Glova ◽  
PM Sagar
Keyword(s):  
New Zealand ◽  
Benthic Invertebrates ◽  
Stomach Contents ◽  
Feeding Habit ◽  
Native Fish ◽  
Selective Feeding ◽  
Chironomid Larvae ◽  
Feeding Periodicity ◽  
Active Fish ◽  
Fish Stomach

To determine the diel feeding periodicity and diet of a lake-inlet population of Galaxias brevipinnis in New Zealand, samples of benthos, drift and fish were collected over a 24-h period in summer. Both numerically and gravimetrically, fish stomach contents revealed that feeding started some time after sunset, peaked towards midnight, and virtually ceased after sunrise. Benthic invertebrates were consumed almost exclusively, with ephemeropterans, trichopterans, and dipterans constituting 95% of the total foods eaten, a major proportion being chironomid larvae. Size of prey eaten compared with size of invertebrates in the benthos differed significantly during the night; this indicated that some size-selective feeding occurred. The benthic feeding habit of Galaxias brevipinnis appears to allow it to forage on relatively small prey during the night, a phenomenon that has been reported for other bottom-dwelling native fish species in New Zealand.

scholarly journals MORPHOFUNCTIONAL FORMATION OF THE SKIN AS AN ORGAN IN THE PROCESS OF ONTOGENESIS

2020 ◽  
Vol 76 (4) ◽  
pp. 131-135
Author(s):  
E.S. Mishina ◽  
◽  
M.A. Zatolokina ◽  
A.A. Ten'kov ◽  
V.V. Tsymbalyuk ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Wistar Rats ◽  
Postnatal Period ◽  
Structural Components ◽  
Functional Changes ◽  
Qualitative And Quantitative ◽  
Laboratory Rats ◽  
Male Wistar Rats ◽  
Gradual Accumulation ◽  
Prenatal Ontogenesis

The development of new areas of medicine requires more accurate visualization of the structural components of the skin of laboratory rats, their spatial distribution and dynamics of changes in the postnatal period. The study was carried out on male Wistar rats skin at different periods of postnatal ontogenesis. There is a gradual accumulation and development of skin derivatives in the skin in the postnatal period, as well as structures laid down in prenatal ontogenesis. In connection with the addition of new functions performed by the skin, qualitative and quantitative morphological and functional changes occur in it.

Biometry of Decapod Crustaceans in the Cantabrian Sea

Crustaceana ◽  
1993 ◽  
Vol 65 (2) ◽  
pp. 192-203 ◽  
Author(s):  
Enrique Rodríguez-Marín
Keyword(s):  
Feeding Habits ◽  
Stomach Contents ◽  
Demersal Fish ◽  
Body Parts ◽  
Decapod Crustaceans ◽  
Fish Stomach

AbstractIn this paper the biometric relationships between the different body parts of decapods are described, allowing the reconstruction of size and biomass (weight) of each sample from its hard parts (chelae and cephalothorax). The usefulness of this study lies in the interpretation of the feeding habits of demersal fish which feed on decapod crustaceans, since the slow digestion of hard skeletons of Decapods gives rise to the appearance of numerous hard parts in fish stomach contents.

Some Are More Equal Than Others: Intrasettlement Social Organization in Spišský Štvrtok (EBA/MBA, Slovakia)

2020 ◽  
pp. 1-28
Author(s):  
Dominika Oravkinová ◽  
Jozef Vladár
Keyword(s):  
Spatial Distribution ◽  
Material Culture ◽  
Bronze Age ◽  
Local Community ◽  
Theoretical Models ◽  
Qualitative And Quantitative ◽  
Carpathian Region ◽  
Middle Range ◽  
Social Units ◽  
Activity Areas

Heterarchical or hierarchical? Egalitarian or unequal? Segmented or complex? Tribe, chiefdom, middle range? All these questions have been vividly discussed in an effort to reconstruct Bronze Age society within a wider area of central Europe. The extensive spectrum of published literature offers varied and often contradictory theoretical models, but we still know very little about the organization of particular social units, especially in the context of settlements. The morphological, technological and spatial analysis of movable and immovable sources from the fortified settlement in Spišský Štvrtok contributes in many respects to solution of the discussed problem in the northeastern Carpathian region. In the case of the Spišský Štvrtok locality, we can interpret the degree of social complexity on the basis of qualitative and quantitative parameters of material culture, evidence of production activities and their specialization level in correlation with spatial distribution of intra-site activity areas. Moreover, the detected tendencies are independently confirmed by the morpho-typological differences between gold and bronze artefacts contained in hoards, by architectonic details and by the presence of regular ritual activities. The achieved results thus indicate possible horizontal and vertical ranking, which was adapted to the local community.

scholarly journals Nonlethal Methods of Examining Fish Stomach Contents

2001 ◽  
Vol 9 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Jan F. Kamler ◽  
Kevin L. Pope
Keyword(s):  
Stomach Contents ◽  
Fish Stomach
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