scholarly journals Allocation of the diet of the Argentine Islands’ inshore ichthyofauna

2021 ◽  
Vol 29 (1) ◽  
pp. 67-72
Author(s):  
A. V. Zinkovskyi ◽  
I. V. Dykyy ◽  
V. M. Trokhymets
Keyword(s):  
Dominant Species ◽  
Common Species ◽  
Ecosystem Change ◽  
Hepatosomatic Index ◽  
Fish Diets ◽  
Phenological Changes ◽  
Pagothenia Borchgrevinki ◽  
Notothenia Coriiceps ◽  
Trematomus Bernacchii ◽  
Access To Food

Fish diets are important indicators of ecosystem change. This aspect of the ichthyofauna of the coast of the Argentine Islands has been insufficiently studied in comparison with other regions. This article presents the results of comparison of dietary and somatic parameters of the dominant species Notothenia coriiceps depending on the point, depth and season of catch. The sample was collected between February 2006 and February 2007. In the year of study, N. coriiceps, Trematomus bernacchii, Chaenocephalus aceratus (common species), Harpagifer antarcticus and Pagothenia borchgrevinki (rare species in this region) were caught. The average fish size in this region does not differ from other places in the Southern Ocean. In Cornice Channel and Stella Creek, N. coriiceps was smaller than at other points due to the narrowness and shallow depth of these places. In winter, large individuals apparently migrated from the coast. The diet of N. coriiceps consisted mainly of crustaceans and seaweeds, with a small number of mollusks (especially limpets), which are common. The number of fish in the diet of N. coriiceps is relatively low for this region. Access to food was relatively the same at different points and depths of the catch. The lowest amount of food was in the fall, the highest amount of food was in the spring and summer. The condition and hepatosomatic index also did not change depending on the point and depth of the catch, but they were low in spring and high in summer. Perhaps this is due to the low energy value of food, which is not compensated by the amount. It is necessary to conduct studies of the diet of N. coriiceps in other years to clarify the specificity of fish in the diet and phenological changes in somatic parameters. Similar studies are needed for other species in the region if catches are sufficient to collect a representative sample.

scholarly journals Changes in acanthocephalan infection of the Antarctic fish Notothenia coriiceps in Admiralty Bay, King George Island, over 29 years

2012 ◽  
Vol 33 (1) ◽  
pp. 99-108 ◽  
Author(s):  
Zdzisław Laskowski ◽  
Małgorzata Korczak-Abshire ◽  
Krzysztof Zdzitowiecki
Keyword(s):  
Dominant Species ◽  
Antarctic Fish ◽  
Common Species ◽  
South Shetland Islands ◽  
King George Island ◽  
Admiralty Bay ◽  
Shetland Islands ◽  
Notothenia Coriiceps ◽  
The Antarctic ◽  
Subdominant Species

Changes in acanthocephalan infection of the Antarctic fishNotothenia coriicepsin Admiralty Bay, King George Island, over 29 yearsA comparison between the levels of infection with Acanthocephala of the fishNotothenia coriicepsin Admiralty Bay (South Shetland Islands, Antarctic) in 1978/79 and 2007/08 is presented. The same eight acanthocephalan species, three echinorhynchids maturing in fish,Aspersentis megarhynchus(dominant species),Metacanthocephalus johnstoni(subdominant species) andM. dalmori(common species), and five polymorphids maturing in mammals and birds,Corynosoma hamanni, C. pseudohamanni(both co-dominant species),C. arctocephaliandC. bullosum(both common species), andC. shackletoni(rare species), were found. Echinorhynchids were more numerous in 2007/08 (mean abundance 46.54 versus 35.35 in 1978/79), whereas polymorphids more numerous in 1978/79 (mean abundance 74.35versus36.40 in 2007/08). The overall results therefore demonstrated that echinorhynchids were more numerous than polymorphids in 2007/08 and the reverse was true in 1978/79. This situation is dependent mainly upon the decreased infections withC. hamanni, C. pseudohamanniandC. bullosum, and to a lesser degree upon the increasing of infections withM. johnstoni.The decrease of the threeCorynosomaspp. is possibly associated with the decreasing of populations of final hosts, seals, on the shore of Admiralty Bay in the vicinity ofArctowskiStation.

scholarly journals Changes in Digenean Infection of the Antarctic Fish Notothenia Coriiceps in Admiralty Bay, King George Island, Over Three Decades

2014 ◽  
Vol 35 (3) ◽  
pp. 513-520 ◽  
Author(s):  
Zdzisław Laskowski ◽  
Witold Jeżewski ◽  
Krzysztof Zdzitowiecki
Keyword(s):  
Dominant Species ◽  
Antarctic Fish ◽  
Common Species ◽  
South Shetland Islands ◽  
Admiralty Bay ◽  
Shetland Islands ◽  
Orkney Islands ◽  
Digenean Species ◽  
Notothenia Coriiceps ◽  
Almost All

AbstractThe infection of black rockcod,Notothenia coriiceps,with digeneans in Admiralty Bay (South Shetland Islands) within three months, from November 2007 to January 2008, is compared with the infection in the same three months in 1978/79, based on the examination of twenty fish collected in each month. Digenea found in 1978/1979 season were more numer-ous, and more diverse. Only five digenean species,Macvicaria georgiana,Neolebouria antarctica,Lepidapedon garrardi,Genolinea bowersiandLecithaster macrocotyle, were re-corded during both investigations, whereas three species,Neolepidapedon trematomi,Elytro-phalloides oatesiandGonocerca phycidis, only in 1978/79.M. georgianawas the dominant species in 1978/79 and sub-dominant in 2007/08. Other digeneans were found inN. coriicepsin 2007/08 invariably together withM. georgiana. G. bowersiwas the sub-dominant species in 1978/79 and the most common species in 2007/2008. Infections with Digenea belonging to other species were much less intense. Of the three rare or common species in 1978/79, the two,L. garrardiandL. macrocotyle, occurred in both seasons, whereasE. oatesioccurred only in 1978/79. Three remaining species were sporadic or absent. The overall results there-fore demonstrated that infections with almost all digenean species were less strong in 2007/08 than three decades earlier, in 1978/79. Only data onM. georgiana,G. bowersiandL.garrardiwere statistically significant (p <0.05). Data on the occurrence of 14 species of Digenea inN. coriicepsfrom South Shetland Islands, South Orkney Islands, South Georgia, Argentine Is-lands, Melchior Islands, Adelie Land and Heard Island are given.

The demography of a dominant Amazon liana species exhibits little environmental sensitivity

2015 ◽  
Vol 32 (1) ◽  
pp. 79-82 ◽  
Author(s):  
Luciana de Campos Franci ◽  
Jens-Christian Svenning ◽  
Henrik Balslev ◽  
Fernando Roberto Martins ◽  
Jacob Nabe-Nielsen
Keyword(s):  
Dominant Species ◽  
Environmental Gradients ◽  
Floristic Composition ◽  
Environmental Variation ◽  
Common Species ◽  
Amazon Forest ◽  
Vegetation Density ◽  
Vital Rates ◽  
Relative Growth ◽  
Positive Effect

Abstract:Despite its high plant diversity, the Amazon forest is dominated by a limited number of highly abundant, oligarchic tree and liana species. The high diversity can be related to specific habitat requirements in many of the less common species, but fewer studies have investigated the characteristics of the dominant species. To test how environmental variation may contribute to the success of dominant species we investigated whether the vital rates of the abundant liana Machaerium cuspidatum is sensitive to canopy height, topographic steepness, vegetation density, soil components and floristic composition across an Ecuadorian Amazon forest. The population was inventoried in 1998 and in 2009. Plants were divided into seedling-sized individuals, non-climbers and climbers. Out of 448 seedling-sized plants 421 died, 539 of 732 non-climbers died, and 107 of 198 climbers died. There was weak positive effect of dense understorey on the relative growth rate of climbers. The mortality of seedling-sized plants was higher in areas with intermediate slope, but for larger plants mortality was not related to environmental variation. The limited sensitivity of the vital rates to environmental gradients in the area suggests that ecological generalism contributes to the success of this dominant Amazonian liana.

New data on the occurrence of Acanthocephala in some fish in Admiralty Bay (South Shetland Islands)

2013 ◽  
Vol 58 (4) ◽  
Author(s):  
Krzysztof Zdzitowiecki ◽  
Zdzisław Laskowski
Keyword(s):  
South Shetland Islands ◽  
Admiralty Bay ◽  
Shetland Islands ◽  
Notothenia Coriiceps ◽  
Reverse Situation ◽  
The Mean ◽  
Trematomus Bernacchii ◽  
Notothenia Rossii

AbstractNew data on the infection with Acanthocephala of 33 fish caught in Admiralty Bay in November 2007 to January 2008 are given. These fish belong to 5 species: Notothenia rossii (22 immature specimens), Lindbergichthys nudifrons (n = 7), Trematomus bernacchii (n = 1), T. newnesi (n = 1) and Harpagifer antarcticus (n = 2). Three species of Echinorhynchida: Aspersentis megarhynchus, Metacanthocephalus dalmori and M. johnstoni and four species of Polymorphida: Corynosoma arctocephali, C. bullosum, C. hamanni and C. pseudohamanni, were found. Prevalence of N. rossii and L. nudifrons was 100%. The mean abundance of infection of N. rossii (125.09) was larger than that of Notothenia coriiceps (82.93). Data of infection of N. rossii in 2007 was almost identical with that in 1979 (mean abundance 118.66). The most abundant in this host were A. megarhynchus, M. johnstoni, C. hamanni and C. pseudohamanni (mean abundances 36.36, 29.77, 13.86 and 44.73, respectively). In total Echinorhynchida were more abundant than Polymorphida in 2007/08 (66.18 versus 58.91). Reverse situation was in 1979 (mean abundance 47.36 for Echinorhynchida and 71.3 for Polymorphida. Only 7 L. nudifrons were examined in 2007/08 and Echinorhynchida were more numerous in this host (mean abundance 26.71) than Polymorphida (10.29). Single specimens of other fish were infected with a few Acanthocephala belonging to species recorded in the same hosts with those found in 1978/79.

scholarly journals INVENTARISASI JENIS BURUNG PANTAI DI KAWASAN PULAU MARSEGU KABUPATEN SERAM BAGIAN BARAT PROVINSI MALUKU

2020 ◽  
Vol 8 (1) ◽  
pp. 16
Author(s):  
Billy Seipalla
Keyword(s):  
Food Availability ◽  
Human Activity ◽  
Dominant Species ◽  
Common Species ◽  
Island Region ◽  
Nature Tourism ◽  
Marine Tourism ◽  
The Government ◽  
Gathering Place ◽  
Species Being

This research was conducted on the island of Marsegu because this area is included in the area of the natural marine tourism park which should be the concern of the government and the community around the island. The study aimed to determine the species of shorebirds found in the Marsegu island region in the western part Seram. The study was conducted in the morning and evening for 2 days at the location which is a gathering place for shorebirds. In the study location, 8 species of shorebirds were found and then inventoried and identified. The number of shorebirds species found in the Marsegu island area was 8 species, among others; Coral egrets (Egratta sacra), Big Egrets (Egretta alba), Trinil Beach (Actitis hypoleucos), Little sea worms (Sterna albifrons), Black wing sea worms (Sterna fuscata), Big (Fregata minor), Sea-eagle belly white (Haliaetus leucogaster), Bondol Hawk (Indus Haliastur), with the dominant species being the Big Cingkalang (Fregata minor). The most common species are large Cikalang (minor Fregata), small sea virgin (Sterna albifrons), and large egret (Egretta alba). Factors that cause the survival of shorebirds on the Marsegu island region because they store a lot of food supplies. In addition, food availability is affected by a lack of human activity in this region and the establishment of this area as a Marine Nature Tourism Park.

scholarly journals Features of the formation of click beetle complexes in perennial plantings of the Western Caucasus

2021 ◽  
Vol 34 ◽  
pp. 04015
Author(s):  
Valeriy Orlov
Keyword(s):  
Dominant Species ◽  
Common Species ◽  
Western Caucasus ◽  
Forest Zone ◽  
Click Beetles ◽  
Click Beetle ◽  
The Western Caucasus

The complexes of click beetles in the perennial plantations of the Western Caucasus are formed at the expense of species from the surrounding (adjacent) biotopes. In the forest zone, the complexes are formed by their similarity to meadow biotopes (biocenoses) with inclusions of dominant species from meadow biotopes of the foothill lane. Agriotes tauricus Heyd., and Drasterius bimaculatus (Rossi) are common species in all lanes and zones of the studied region. Species Agriotes gurgistanus (Fald.), Melanotus fusciceps (Gyll.), Athous Circassiensis Reitt., Agriotes sputator (L.) are most often dominant of elateridocoplex.

scholarly journals MICROHABITAT PREFERENCE OF SEASTAR IN HARI ISLAND WATERS, SOUTHEAST SULAWESI

2014 ◽  
Vol 6 (1) ◽  
Author(s):  
Syamsidar Gaffar ◽  
Neviaty P Zamani ◽  
Pradina Purwati
Keyword(s):  
Dominant Species ◽  
Food Source ◽  
Reef Coral ◽  
Sampling Technique ◽  
Common Species ◽  
Shallow Waters ◽  
Microhabitat Preference ◽  
Coordinate Position ◽  
Northern Side ◽  
Linckia Laevigata

The objective of this study was to explore the information on the microhabitat preference of asteroidea in Hari Island Waters, Southeast Sulawesi.  The specimens were collected in August 2012 and December 2012. The methods used in this study were road sampling technique, freehandpicking, and observation. The geographical coordinate position of the asteroidea and microhabitat were recorded by using GPS and then mapped by using the ArcGIS 10.1.  Asteroidea map was overlayed with microhabitat map to determine the microhabitat preference. The study found 9 species of asteroidea belonging to 7 generas, 4 families, and 2 orders. All the asteroidea were relatively common species in the tropical shallow waters. The species were distributed along sides of the island with majority found in the northern side. The dominant species, Linckia laevigata, was found in all microhabitat which had beed adapted to various microhabitat conditions and water fluctuation. Based on area of distribution and population density, seastar tended to use reef coral as its microhabitat preference since reef coral could serve as a food source and habitat protection. Keywords: Seastar, microhabitat preference, Hari island

Spatial-typological structure of blackflies communities (Diptera: Simuliidae) of the River Tisa basin within of the Ukrainian Carpathians

2019 ◽  
Vol 15 (2) ◽  
pp. 59-70
Author(s):  
A. M. Tepliuk ◽  
K. B. Sukhomlin
Keyword(s):  
Species Diversity ◽  
High Altitude ◽  
River Basin ◽  
Dominant Species ◽  
Common Species ◽  
High Mountain ◽  
Typological Structure ◽  
Subdominant Species

A total of 46 species of blackflies from 2 genera were recorded in the watercourses of the Tisa River basin within Ukrainian Carpathians. In qualitative terms, the genus Simulium Latreille, 1802 predominates, with 42 species in 5 subgenera: Nevermannia Enderlein, 1921 (9 species), Eusimulium Roubaud, 1906 (2 species), Wilhelmia Enderlein, 1921 (4 species), Obuchovia Rubtsov, 1947 (2 species) and Simulium Latreille, 1802 (25 species). The genus Prosimulium Roubaud, 1906 is represented with only 4 species. Moreover, 33 species develop in streams (the index of the species diversity of Simpson (Is) is 0,094), and 32 species (Is – 0,087) of Simuliidae develop in rivers. There are 19 common species for both types of watercourses (the index of similarity of Chekanovsky-Sorensen (I) is 0.37). Only 14 species of blackflies develop in streams, and only 13 species develop in rivers. Two dominant species (S. (s.str.) intermedium, S. (s.str.) trifasciatum) and 4 subdominant species (S. (s.str.) argyreatum, S. (s.str.) ornatum, S. (s.str.) reptans, S. (s.str.) variegatum) form the nucleus of the fauna Simuliidae of the Tisa River basin. The species diversity of blackflies reaches 33 species (Is – 0,075) at watercourses of the low mountain level (at altitudes up to 499 m), is has 38 species (Is – 0,067) at the middle mountain level (500–999 m) and only 24 species (Is – 0,021) at high mountain level (above 1000 m). Only 6 species (S. (Eusimulium) velutinum, S.(Obuchovia) brevifile, S. (s.str.) noelleri, S. (s.str.) rostratum, S. (s.str.) tuberosum and S. (s.str.) voilense) develop in the watercourses of the low mountain level, 5 blackfly species (S. (Nevermannia) codreanui, S. (Wilhelmia) pseudoequinum, S. (s.str.) argenteostriatum, S. (s.str.) paramorsitans and S. (s.str.) vulgare) develop in the watercourses of the middle mountain level and 2 species blackflies (S. (Nevermannia) crenobium and S. (Nevermannia) oligotuberculatum) develop in the watercourses of the high mountain level. There are 16 species of Simuliidae common for this high altitude belts, among them S. (Nevermannia) vernum, S. (s.str.) fontanum, S.(s.str.) intermedium, S.(s.str.) ornatum and S. (s.str.) trifasciatum did not reveal the definite patterns of belonging to the specific altitudes, since their quantity was approximately the same at different heights.

Experimental removal of a dominant species at two levels of soil fertility

1989 ◽  
Vol 67 (12) ◽  
pp. 3470-3477 ◽  
Author(s):  
Jessica Gurevitch ◽  
Robert S. Unnasch
Keyword(s):  
Species Richness ◽  
Species Diversity ◽  
Soil Fertility ◽  
Dominant Species ◽  
Dactylis Glomerata ◽  
Common Species ◽  
Herbaceous Plant ◽  
Old Field ◽  
Steep Decline ◽  
Dactylis Glomerata L

Fertilization of the soil in herbaceous plant communities has been observed to lead to an increase in productivity but a decline in species richness and diversity. We tested the hypothesis that the decline in diversity is due to increased competition from a dominant species by removing the dominant species, Dactylis glomerata L., from an old field community with and without fertilization. Fertilization without the removal of Dactylis resulted in a steep decline in species numbers and in species diversity. The removal of Dactylis when fertilizer was added prevented the decline in species richness. Removal of this dominant species led to an increase in species diversity, an increase in either the frequency or the abundance of almost half of the common species in the system, and an increase in the combined biomass of uncommon species. The response to the removal of Dactylis was greater at higher than at low soil fertility for most but not all variables. Key words: old-field, fertilization, competition, species diversity, community structure, Dactylis glomerata.

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