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| Registros recuperados: 37 | |
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| Кузьменко, Л. В.; Игнатьев, С. М.. |
| Приводятся результаты исследования количественного развития фитопланктона для прибрежных вод Аргентинского архипелага. Материалы собраны в 7-й УАЭ (зимовка 2002 – 2003 гг.) и 10-й УАЭ (сезонные работы 2005 г.). Впервые получены сведения о сезонной динамике количественного развития, видовом разнообразии фитопланктона, выделены доминирующие виды, сроки их массовой вегетации и стадии сукцессии. В водах архипелага обнаружено 126 видов и разновидностей микроводорослей, 73% из которых – диатомовые, 16,6 % - динофитовые. Исследования, проведённые антарктической осенью 2005 г., дополнили список видов на 31 таксон. Наиболее высокие показатели обилия фитопланктона получены для весенне-летнего сезона, когда в октябре наблюдалось «цветение» воды, вызванное мелкими... |
| Tipo: Journal Contribution |
Palavras-chave: Фитопланктон; Численность; Биомасса; Видовой состав; Аргентинские о-ва; Антарктика; Phytoplankton; Abundance; Biomass; Species composition; Argentine Islands; Antarctic; Фітопланктон; Чисельність; Біомаса; Видовий склад; Аргентинські о-ви. |
| Ano: 2007 |
URL: http://repository.ibss.org.ua/dspace/handle/99011/847 |
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| Marandel, Florianne; Lorance, Pascal; Trenkel, Verena. |
| Sustainable fisheries management requires assessment of exploited populations and communities. Traditional fisheries stock assessment methods need species‐specific input data, which for skates have only recently become available in Europe. To overcome this limitation, a Bayesian multispecies biomass production model was developed. In addition to aggregated landings, input data are short time series with species‐specific information (landings and biomass indices). Applying the approach to four main skate species and a group of two skate species, all managed together in the Bay of Biscay (Northeast Atlantic), long‐term changes in the skate assemblage composition were identified. Since the 1990s, Leucoraja naevus became increasingly dominant, while the... |
| Tipo: Text |
Palavras-chave: Community changes; Fishing impacts; Multispecies management; Multispecies model; Rajiformes; Species composition; Vulnerable skates. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00589/70088/68138.pdf |
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| Pascual-alayon, P; Floch, Laurent; N'Gom, F; Dewals, P; Irie, D; Amatcha, Ah; Amande, M-j. |
| The document presents an overall summary of the fishing activities of the European and assimilated purse seine and bait boat fleets operating in the eastern Atlantic Ocean over the period 1991-2017. We describe the annual changes in fleet technical characteristics (carrying capacity, size), fishing effort (fishing and searching days), extent of fishing grounds, catches and nominal Catch per Unit Effort by species, as well as the average individual weight by species. Maps are also presented indicating the fishing effort distribution in the Atlantic, as well as the spatio-temporal distribution of European and assimilated purse seine catches in 2017 compared to previous years (2010-2016). |
| Tipo: Text |
Palavras-chave: Tuna fishery; Yellowfin; Skipjack; Purse seiners; Catch/effort; CPUE; Species composition; Size composition. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00490/60190/63533.pdf |
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| Mérigot, Bastien; Gaertner, Jean-claude; Brind’amour, Anik; Carbonara, Pierluigi; Esteban, Antonio; Garcia-ruiz, Cristina; Gristina, Michele; Imzilen, Taha; Jadaud, Angelique; Joksimovic, Aleksandar; Kavadas, Stefanos; Kolitari, Jerina; Maina, Irida; Maiorano, Porzia; Manfredi, Chiara; Micallef, Reno; Peristeraki, Panagiota; Relini, Giulio; Sbrana, Mario; Spedicato, Maria Teresa; Thasitis, Ioannis; Vittori, Stefania; Vrgoc, Nedo. |
| Trawling pressure and environmental changes may affect the composition of fish assemblages. Our knowledge on large spatio-temporal patterns of demersal fish composition remains incomplete for the Mediterranean Sea. We investigated (1) the spatio-temporal stability of demersal assemblages, (2) the relationships between these assemblages and potential structuring factors (trawling pressure and environmental conditions) in order to assess the dynamic of the assemblage structure at the scale of the northern Mediterranean Sea. We analysed a dataset of 18062 hauls from 10 to 800 m depth performed annually during the last two decades across 17 Geographical Sub-Areas (GSAs) (MEDITS program). A multi-table analysis (STATICO-CoA) evidenced a strong inter-GSAs... |
| Tipo: Text |
Palavras-chave: Species composition; Stability; Demersal assemblages; Environment; Fishing pressure; Large scale; Co-inertia analysis; STATICO-CoA. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00584/69629/67485.pdf |
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| Mendonça Jr,Milton De S; Piccardi,Hosana M F; Jahnke,Simone M; Dalbem,Ricardo V. |
| Galling arthropods create plant structures inside which they find shelter. Factors acting on galler diversity are still being discussed, with this fauna considered more diverse in xeric than mesic environments (higrothermic stress hypothesis, HSH), and also in more plant diverse sites. Here we compare galler abundance (N), equitability (E), species richness (S) and composition between adjacent restinga (xeric) and swamp forests (mesic) in Parque Estadual de Itapeva (29°21' S, 49°45' W), Rio Grande do Sul, southern Brazil. Five trails, two in swamp forest and three in restingas, were sampled four times each (January/December 2005). After an effort of 60h/person, 621 galled plant individuals belonging to 104 gall morphotypes were recorded. This suggests a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hygrothermic stress; Gall; Species composition; Species richness. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000400008 |
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| Casatti,Lilian; Teresa,Fabrício Barreto; Gonçalves-Souza,Thiago; Bessa,Eduardo; Manzotti,Angelo Rodrigo; Gonçalves,Cristina da Silva; Zeni,Jaquelini de Oliveira. |
| The aim of this study was to verify whether taxonomic and functional composition of stream fishes vary under three different preservation conditions of riparian zone: preserved (PRE), intermediate condition (INT), and degraded (DEG). Five stream stretches representing each condition were selected. Samples were taken from each stream in three occasions during the dry seasons from 2004 to 2007. Electro fishing (PRE and INT), sieves, dip nets, and hand seines (DEG) were used according to the characteristics of each sampled site. Overall, 46 species were registered. Differences in the taxonomic and functional species composition among groups were found, following the condition of riparian zones. The ichthyofauna recorded in the PRE was typical to pristine... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biotic homogenization; CWM analysis; Functional composition; Riparian forest; Species composition. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000100020 |
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| Anjos,Maeda Batista dos; Zuanon,Jansen. |
| Small streams are important components of the landscape in terra firme forests in central Amazonia and harbor a large number of fish species. Nevertheless, the lack of a common sampling protocol in studies of this ichthyofauna hinders comparisons among available results. This study evaluates how the length of stream reach sampled affects estimates of local fish species density in 1st, 2nd, and 3rd order streams, and proposes a mean minimum sampling length that best approximates the absolute number of species in a given stream segment. We sampled three streams in the Biological Dynamics of Forest Fragments Project's study sites, between May and August 2004. At each stream, one 1st order, one 2nd order, and one 3rd order segment was sampled. We sampled five... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish diversity; Fish abundance; Stream size; Species composition; Species accumulation curves. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000100006 |
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| Elías, E; Calderón, G.; Luzuriaga, G.; Chavarría, J.. |
| Entre el 04 y 13 de septiembre de 2007, se realizó el crucero T07-09-04HL, para determinar la composición de huevos y larvas de peces en la zona marine costera de la costa ecuatoriana. El área de estudio se subdividió en cuatro subáreas, dentro de las cuales se ubicaron 157 estaciones donde se realizaron arrastres verticales utilizando una red CalVET. Se registro un total de 15 940 huevos de peces.m-2, correspondientes a 11 órdenes, 19 familias, 18 géneros, 18 especies y además huevos en su primer estadio embrionario. También se identificaron 23 140 larvas.m-2, que correspondieron a 12 órdenes, 32 familias, 45 géneros, 45 especies, y organismos en estado de prelarva. La distribución de las áreas de abundancia de huevos y larvas de peces determine zonas de... |
| Tipo: Journal Contribution |
Palavras-chave: Fish eggs; Fish larvae; Species composition; Spatial distribution; Ichthyoplankton. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/4835 |
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| Hasegawa,Motohiro; Fukuyama,Kenji; Makino,Shun'ichi; Okochi,Isamu; Tanaka,Hiroshi; Okabe,Kimiko; Goto,Hideaki; Mizoguchi,Takeo; Sakata,Tadashi. |
| Collembolan communities in conifer plantations (Japanese cedar, Cryptomeria japonica) and secondary deciduous broad-leaved forests of varying ages were investigated to determine the extent to which forest conversion (broad-leaved to coniferous) affects the species richness and assemblage composition of Collembola in central Japan. Density and total species richness of Collembola not differed between the broad-leaved and cedar forests except immediately after clear-cutting. The amount of forest-floor organic matter was larger in cedar forests and positively correlated with the species richness of detritus feeders. Species richness of fungal feeders and sucking feeders positively correlated with the species richness of forest-floor plants. There was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Japanese cedar; Species composition; Feeding habit; Undergrowth. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000800012 |
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| Ferreira,Alexandre Cunha de Barcellos; Borin,Ana Luiza Dias Coelho; Bogiani,Julio Cesar; Lamas,Fernando Mendes. |
| Abstract: The objective of this work was to evaluate the dry matter yield of cover crops and their suppressive effects on weeds. The experiment was carried out during three years in a cerrado area of the state of Goiás, Brazil, and consisted of 16 treatments with fallow and cover crops cultivated in single cropping and intercropping. Fallow allowed high weed infestation. Cover crops affected the composition of weeds, which showed greater diversity in fallow, followed by the Pennisetum glaucum 'BRS 1501' and Cajanus cajan crops. In the average of the three experimental years, the highest dry matter yield was observed for the treatments Panicum maximum (10,857 kg ha-1), Urochloa brizantha 'Piatã' (11,437 kg ha-1), U. ruziziensis (9,463 kg ha-1), and U.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fallow; Species composition; Straw mulch; Weed control. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000500566 |
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| Soares,Stela de Almeida; Suarez,Yzel Rondon; Fernandes,Wedson Desidério; Tenório,Patrícia Mara Soares; Delabie,Jacques Hubert Charles; Antonialli-Junior,William Fernando. |
| Temporal variation in the composition of ant assemblages (Hymenoptera, Formicidae) on trees in the Pantanal floodplain, Mato Grosso do Sul, Brazil. In this paper we investigate how seasonal flooding influences the composition of assemblages of ants foraging on trees in the Pantanal of Mato Grosso do Sul. During the flood in the Pantanal, a large area is covered by floods that are the main forces that regulate the pattern of diversity in these areas. However, the effects of such natural disturbances in the ant communities are poorly known. In this sense, the objective of this study was to evaluate the effect of temporal variation in assemblages of ants foraging on trees in the Pantanal of Miranda. Samples were collected during a year in two adjacent areas,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ants; Flood and non-flood season; Insecta; Richness; Species composition. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262013000100013 |
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| MENESES,ISABEL; SANTELICES,BERNABE. |
| According to biogeographic studies made two decades ago, marine benthic algal species of the Pacific temperate coast of South America could be grouped into five components according to their geographic affinities. Each of these components was distributed differentially along the coastline between 4º and 56ºS and thus, their contribution to the overall flora varied depending on the latitude. Species composition changed at specific latitudes in such a way that three groups could be observed: from 4 to 6ºS, from 6 to 30ºS and from 30 to 55ºS. Since 1980, new information on marine algae along this coastline allows a review of the previous phytogeographic characterization. The presence/absence of algal species, separated by division and geographic affinity, was... |
| Tipo: Journal article |
Palavras-chave: Distribution patterns; Breaking points; Species composition; Temperate Pacific. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400006 |
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| Registros recuperados: 37 | |
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