|
|
|
| Registros recuperados: 23 | |
|
|
| Harris, Sarah; Kervinen, Matti; Lebigre, Christophe; Pike, Thomas W.; Soulsbury, Carl D.. |
| Male ornaments function as honest cues of male quality in many species and are subject to intra‐ and intersexual selection. These ornaments are generally studied during peak expression, however their size outside the breeding season may determine ultimate ornament size and costliness, and as such reproductive success. We investigated whether male black grouse Lyrurus tetrix eye comb size was related to age, condition and measures of male dominance before and during the breeding season. Total combined eye comb size began to increase ~70 days before the start of the breeding season. Adult males (aged ≥ 2 years old) had consistently larger eye combs than younger males (1 year old) both before and during the breeding season. Heavier and more dominant adult... |
| Tipo: Text |
Palavras-chave: Age; Ornament expression; Dominance. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00440/55121/56577.pdf |
| |
|
|
| Araújo,Túlio Raimundo de; Ribeiro,Ariana Cella; Doria,Carolina Rodrigues da Costa; Torrente-Vilara,Gislene. |
| Belmont Stream is the main tributary of the Madeira River in the area immediately downriver from the Santo Antonio Fall. Samplings were carried out using gill nets in the mouth of this stream between May 2005 and April 2006 and resulted in a list of 74 species. The analyses included values of composition, constancy of occurrence, species richness, abundance, Catch Per Unit of Effort and trophic structure about the ten most abundant species. Characiformes and Siluriformes were dominant order in the samples and Curimatidae (popularly known as "branquinhas") was the most abundant family, represented by Psectrogaster rutiloides (32.57% of the collected specimens), Potamorhina altamazonica (10.72%), and Potamorhina latior (7.79%). The most of species were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Richness; Dominance; CPUE; Migratory route; Amazon. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032009000300001 |
| |
|
|
| Alencar,A.I.; Sousa,M.B.C.; Abbott,D.H.; Yamamoto,M.E.. |
| Dominance status among female marmosets is reflected in agonistic behavior and ovarian function. Socially dominant females receive submissive behavior from subordinates, while exhibiting normal ovulatory function. Subordinate females, however, receive agonistic behavior from dominants, while exhibiting reduced or absent ovulatory function. Such disparity in female fertility is not absolute, and groups with two breeding females have been described. The data reported here were obtained from 8 female-female pairs of captive female marmosets, each housed with a single unrelated male. Pairs were classified into two groups: "uncontested" dominance (UD) and "contested" dominance (CD), with 4 pairs each. Dominant females in UD pairs showed significantly higher... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Callitrichids; Dominance; Progesterone levels; Agonistic behavior; Marmosets. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000500012 |
| |
|
|
| Spehar,Carlos Roberto. |
| High available aluminium and low levels of calcium below the ploughed zone of the soil are limiting factors for agricultural sustainability in the Brazilian Cerrados (Savannahs). The mineral stresses compound with dry spells effect by preventing deep root growth of cultivated plants and causes yield instability. The mode of inheritance for grain yield and mineral absorption ratio of a diallel cross in soybeans [Glycine max (L.) Merrill] grown in high and low Al areas was identified. Differences among the genotypes for grain yield were more evident in the high Al, by grouping tolerant and non-tolerant genotypes for their respective arrays in the hybrids. A large proportion of genetic variance was additive for grain yield and mineral absorption ratio in both... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aluminium; Calcium; Cultivar; Additive; Dominance; Breeding. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000600011 |
| |
|
| |
|
|
| Escalas, Arthur; Catherine, Arnaud; Maloufi, Selma; Cellamre, Maria; Hamlaoui, Sahima; Yepremian, Claude; Louvard, Clarisse; Trousselier, Marc; Bernard, Cécile. |
| Evaluating the causes and consequences of dominance by a limited number of taxa in phytoplankton communities is of huge importance in the current context of increasing anthropogenic pressures on natural ecosystems. This is of particular concern in densely populated urban areas where usages and impacts of human populations on water ecosystems are strongly interconnected. Microbial biodiversity is commonly used as a bioindicator of environmental quality and ecosystem functioning, but there are few studies at the regional scale that integrate the drivers of dominance in phytoplankton communities and their consequences on the structure and functioning of these communities. Here, we studied the causes and consequences of phytoplankton dominance in 50... |
| Tipo: Text |
Palavras-chave: Dominance; Phytoplankton; Co-occurrence network; Community cohesion; Community functioning; Periurban waterbodies. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00508/61962/66081.pdf |
| |
|
|
| Corrêa,S.A.; Fernandes,M.O.; Iseki,K.K.; Negrão,J.A.. |
| The objective of the present study was to investigate the influence of the establishment of dominance relationships and social stress on plasma cortisol and metabolite levels in Nile tilapia (Oreochromis niloticus). During the 30-day experiment, the fish weighing 236 ± 29 g were kept in individual aquaria, except for two pairings lasting 6 h each. Blood samples were taken from the animals before and after pairing. Display, approach, attack, rebuff, chase flight, and coloration were carried out on days 16 and 30. Activities and behaviors characteristic of the establishment of dominance relationships were described. It was possible to classify all experimental fish (N = 30) as dominant or subordinate. No differences were detected between dominant (N = 15)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tilapia; Social stress; Social relationships; Agonistic behaviors; Cortisol; Dominance. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003001200015 |
| |
|
| |
|
|
| Lanna,Lucas L.; Azevedo,Cristiano S. de; Claudino,Ricardo M.; Oliveira,Reisla; Antonini,Yasmine. |
| ABSTRACT During flight, hummingbirds achieve the maximum aerobic metabolism rates within vertebrates. To meet such demands, these birds have to take in as much energy as possible, using strategies such as selecting the best food resources and adopting behaviors that allow the greatest energy gains. We tested whether hummingbirds choose sources that have higher sugar concentrations, and investigated their behaviors near and at food resources. The study was conducted at Atlantic forest remnant in Brazil, between June and December 2012. Four patches were provided with artificial feeders, containing sucrose solutions at concentrations of 5%, 15%, 25% and 35% weight/volume. Hummingbird behaviors were recorded using the ad libitum method with continuous... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Behavioral strategies; Dominance; Food resources; Subordination; Trapline. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702017000100305 |
| |
|
|
| DEMARCHI,Layon Oreste; SCUDELLER,Veridiana Vizoni; MOURA,Livia Carvalho; DIAS-TERCEIRO,Randolpho Gonçalves; LOPES,Aline; WITTMANN,Florian Karl; PIEDADE,Maria Teresa Fernandez. |
| ABSTRACT The Amazonian white-sand vegetation presents a set of unique features, such as the dominance of a few species, high endemism and low species richness, which differentiate it from other Amazonian forests. Soil parameters have long been recognized as the main drivers of white-sand vegetation (WSV) characteristics. However, how they influence the composition, richness and structure of this vegetation type is still poorly understood. In this study we investigated the variation in floristic composition between patches and the soil-vegetation relations in three central Amazonian WSV patches. We tested whether slight differences in soil properties are linked with differences in floristic composition, species richness and forest structure in adjacent... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Species richness; Oligotrophic ecosystems; Dominance; Sum of bases. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672018000100046 |
| |
|
|
| Prestes,Alan Miranda; Oliveira,Mauricio Morgado de; Mello,Fernanda Cristina Breda; Rorato,Paulo Roberto Nogara; Lopes,Jader Silva; Feltes,Giovani Luis; Bravo,André Padilha. |
| Abstract: The objective of this work was to identify the most suitable model for the genetic evaluation of post-weaning weight gain in a multibreed Angus-Nelore population. Three models were tested using the Bayesian inference method: traditional animal model (M1), multibreed animal model without (M2) and with segregation (M3). The choice of the best model followed the criteria: number of parameters (Np), deviance information criterion (DIC), conditional predictive ordinate (CPO), and deviance based on Bayes factors. Spearman’s rank correlations were estimated for the top 10, 20, and 30% sires. M1 presented the highest values for all criteria, except for Np, and the lowest direct heritability estimate of 0.15±0.01. The heritability estimates for M2 and M3... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal breeding; Crossbreeding; Dominance; Epistatic losses; Genetic parameters. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102803 |
| |
|
|
| Oliveira-Silva,Leonardo; Ramos,Telton Pedro Anselmo; Carvalho-Rocha,Yuri Gomes Ponce; Viana,Katherine Morais Porto; Avellar,Raizze da Costa; Ramos,Robson Tamar da Costa. |
| Abstract: The Mamanguape River Basin is located in a peripheral semi-arid area of South America, with its headwaters and middle reaches running through the Caatinga (from wetter to drier) and its lower reaches through the Atlantic Forest. The objective of this study was to inventory the fish fauna of the Mamanguape river basin through a comprehensive sampling and to discuss its ichthyofaunal dominance pattern. Sampling was conducted between 2015 and 2016 at 38 points throughout. The main river course was sampled at 18 fixed points during two expeditions (dry and wet seasons) using traw nets, cast nets, and dip nets, with a standardized effort. The tributaries were sampled during the dry season at 20 points using an adaptaptation of the AquaRAP methodology.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Neotropical Region; Brazilian Semiarid; Freshwater Fish; Species List; Dominance; Endemism. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000300204 |
| |
|
|
| Cabrales-Herrera,Eliecer Miguel; Barrera-Violeth,José Luis; Novoa-Yanez,Rafael. |
| Abstract Currently plantain cultivation makes excessive use of agrochemicals, condition that threatens a sustainable production system and leads to the degradation of the environment, reducing the quality of the products. Based on the foregoing, and in order to expand knowledge of the arbuscular mycorrhizal fungi associated with plantain cultivation, the aim of this study was to isolate and identify fungal morphotypes that form symbiosis with plantain (Musa AAB Simmonds cv. Hartón), in farms from seven municipalities of the department of Córdoba, Colombia. In each farm, soil samples from the first 20 cm of soil depth in the rhizosphere area were taken to the soil laboratory at Universidad de Córdoba, Colombia, where spores were extracted using the OHM and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Endomycorrhizae; Musa AAB; Diversity; Dominance; Glomus; Morphotype. |
| Ano: 2018 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100017 |
| |
|
| |
|
|
| Murakami,André S. N.; Shima,Sulene N.; Desuó,Ivan C.. |
| In the primitively eusocial wasps, especially Polistini and Mischocyttarini tribes, the physiological condition of each individual is strongly associated with its dominance status in the colonial hierarchy. As a rule, in independent-founding wasps, female wasps are all morphologically alike, and their role is apparently quite flexible even as adults. However, some studies have shown that differences in body size can exist between reproductive and non-reproductive females. Thus, the present study aimed at detecting differences between reproductive (inseminated) and non-reproductive (uninseminated) individuals based on morphological and physiological parameters. We tape-recorded the daily behavioural repertory of six colonies of Mischocyttarus cassununga for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dominance; Social hierarchy; Morphometry; Physiology; Mischocyttarini. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262009000400017 |
| |
|
|
| Hennessy, David A.. |
| While rotation strategies are important in determining agricultural commodity supply and environmental benefits from land use, little has been said about the economics of crop rotation. An issue when seeking to identify rotation dominance is whether yield and input-saving carry-over effects persist for one or more years. Focusing on length of carry-over, expected profit maximization, and the monoculture decision, this paper develops principles concerning choice of rotation structure. For some rules that we develop, rotations may be discarded without reference to price levels while other rules require price data. We also show how risk aversion in the presence of price uncertainty can alter preferences over rotations. A further consideration in rotation... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Dominance; Jointness; Quasiconvexity; Rotation algebra; Specialization; Time rationing; Crop Production/Industries. |
| Ano: 2004 |
URL: http://purl.umn.edu/18562 |
| |
|
| |
|
|
| Concenço,G.; Tomazi,M.; Correia,I.V.T.; Santos,S.A.; Galon,L.. |
| In simple terms, a phytosociological survey is a group of ecological evaluation methods whose aim is to provide a comprehensive overview of both the composition and distribution of plant species in a given plant community. To understand the applicability of phytosociological surveys for weed science, as well as their validity, their ecological basis should be understood and the most suitable ones need to be chosen, because cultivated fields present a relatively distinct group of selecting factors when compared to natural plant communities. For weed science, the following sequence of steps is proposed as the most suitable: (1) overall infestation; (2) phytosociological tables/graphs; (3) intra-characterization by diversity; (4) inter-characterization and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weed community; Density; Frequency; Dominance; Diversity; Similarity. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000200025 |
| |
|
|
| Cromberg,VU; Stein,MS; Boleli,IC; Tonhati,H; Queiroz,SA. |
| The aim of this research study was to evaluate the reproductive performance of tinamous submitted to five different male:female ratios. The study was carried out with 72 birds in a randomized experimental design with 4 replications. Tinamous were housed in cages, using the ratios of one (1:1), two (2:1), three (3:1) and four (4:1) females per male, and also one male was housed with three females individually (3R:1), in a rotational system. Reproductive records of the breeding season from September 2004 to March 2005 were used. The reproductive traits studied were: number of eggs laid, fertility, and percentage of eggs damaged and cracked by pecking. Nonparametric analyses of these traits were performed using Kruskal-Wallis test. Two replications of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agonistic behavior; Domestication; Dominance; Laying birds; Tinamous. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2007000300004 |
| |
|
| |
| Registros recuperados: 23 | |
|
|
|
