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| Registros recuperados: 13 | |
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| Nunes,Lucas; Burle,Giulia; Gumboski,Emerson Luiz; Dechoum,Michele. |
| ABSTRACT Lichens play a key role in natural ecosystems, as they can function as primary producers, recycle minerals and fix nitrogen. Despite their environmental importance, little is known about lichen ecology in Brazil, and especially about how abiotic factors may influence their spatial distribution. In this study, we aimed to verify how the cover and richness of corticolous lichens on Araucaria angustifolia trunks vary between two different habitats (Forest and Grassland). The photoquadrat sampling method was applied to A. angustifolia trunks. The Coral Point Count software with Excel extensions (CPCe) was used to analyze photographs for lichen cover and richness. Additionally, a redundancy analysis was conducted to estimate how five abiotic and two... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ascomycota; Corticolous lichens; Environmental selectivity; Fungi; Lichen ecology; Niche overlap. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000100021 |
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| SOUZA,URSULLA P.; FERREIRA,FABIO C.; CARMO,MICHELE A.F.; BRAGA,FRANCISCO M.S.. |
| ABSTRACT In this paper, we determined diet composition, reproductive periodicity and fecundity of Astyanax intermedius in a headwater stream of a State Park of an Atlantic rainforest. We also evaluated the influence of rainfall, water temperature and fish size on niche width and niche overlap. Sampling was conducted monthly throughout one year in the Ribeirão Grande stream, southeastern Brazil. Diet consisted of 31 food items with equal contribution of allochthonous and autochthonous items. Females were larger than males, and the mean sizes at first maturation were 4.44 cm and 3.92 cm, respectively. Based on 212 pairs of mature ovaries, the number of oocytes per female ranged from 538 to 6,727 (mean = 2,688.7). Niche width and niche overlap were not... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Characidae fishes; Niche overlap; Niche width; Spawning type. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502151 |
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| Galizzi,M. Celeste; Zilli,Florencia; Marchese,Mercedes. |
| The gut contents of nine genera of benthic Chironominae and Tanypodinae from the Middle Paraná River floodplain habitats (a lake and a secondary channel) were analyzed to determine their feeding patterns and functional feeding groups. Amorphous detritus, animal and vegetal tissues, and mineral materials (predominantly sand) were observed in the larval guts. Amorphous detritus were the main food item found for Polypedilum (Tripodura) sp., Chironomus gr. decorus sp., Endotribelos sp., Phaenopsectra sp., Cladopelma sp., and Pelomus sp. (Chironominae), while animal tissues (mainly oligochaetes) were the most important food item found for Ablabesmyia (Karelia) sp., Coelotanypus sp., and Procladius sp. (Tanypodinae). Dietary overlap was calculated for all pairs... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gut content; Niche overlap; Chironominae; Tanypodinae. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000200001 |
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| Silva,Norma Machado da; Fantinel,Carina da Conceição; Valente,Vera Lucia da Silva; Valiati,Vitor Hugo. |
| Ecological parameters such as trophic niche overlap and niche breadth were computed from the frequency of all drosophilid species collected in 2001 and 2002, in the urban area of Porto Alegre city, Brazil. Independently of place, drosophilids community composition and components breeding or feeding sites, the highest frequencies of Zaprionus indianus (Gupta, 1970) were obtained during seasons with higher average temperatures, especially during summer. From a total of the 19,146 individuals of Z. indianus sampled, 80% were found in this season. The data of trophic niche breadth suggest a higher opportunism of adult flies in feeding substrate use, but the females are still selective in oviposition substrate choice. For the values of niche overlap, only for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Drosophilids; Niche overlap; Niche breadth. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212005000300002 |
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| Brewster, J. D.; Giraldo, Carolina; Choy, E. S.; Macphee, S. A.; Hoover, C.; Lynn, B.; Mcnicholl, D. G.; Majewski, A.; Rosenberg, B.; Power, M.; Reist, J. D.; Loseto, L. L.. |
| Polar cod (Boreogadus saida) is one of the most studied Arctic marine fishes given its circumpolar distribution and centralised role in the Arctic marine food web. In contrast, relatively little is known about two other Arctic Gadidae: saffron cod (Eleginus gracilis) and Greenland cod (Gadus ogac). Climate change is expected to have an effect on sea ice-associated species, such as polar cod, but due to our lack of knowledge of other arctic gadid species it remains unclear how climate change will impact them and their interactions within the arctic marine ecosystem. Here, we explored the ecology of three Arctic Gadidae that co-occur in the Canadian Beaufort Sea. Stable isotope (SI) (niche overlap) and fatty acid (FA) (correspondence analysis and linear... |
| Tipo: Text |
Palavras-chave: Niche overlap; Fatty acids; Stable isotopes; Beaufort Sea; Cod. |
| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00397/50797/54141.pdf |
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| FONSECA-PÉREZ,KIMBERLYN A.; MOLINA,CÉSAR; TÁRANO,ZAIDA. |
| ABSTRACT The coexistence of species with similar ecological requirements (food, space, time) has typically drawn attention of researchers because competition for resources is expected to be high. The diet and microhabitat occupation of two morphologically and ecologically similar species of Hylidae (Anura), Dendropsophus microcephalus and Scarthyla vigilans, were analyzed at a locality in north-western Venezuela, with the aim of addressing the potential for space and food competition between them. Diet was estimated through the analysis of stomach contents and microhabitat occupation was estimated through recordings of perch type, height and horizontal distance to water. Thirty-six prey categories (32 families, 4 orders) of arthropods were identified: 30... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diet; Generalist; Niche overlap; Resource partitioning; Microhabitat; Morphometry. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492017000700093 |
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| Doutel-Ribas,Cynthia; Martins,Fernando Ibanez; Campos,Zilca; Piovezan,Ubiratan; Tomas,Walfrido; Silva,Virgínia Santiago; Pellegrin,Aiesca; Mourão,Guilherme. |
| Abstract: The objective of this work was to estimate an index of the relative biomass per species, in a medium to large-sized mammal community, as well as to determine how the introduced wild boar (Sus scrofa) fits into this index, and to verify if the occupancy of sites by domestic dogs interferes with those of wild boars and how much the periods of dogs’ activity overlap those of wild boars. The biomass/effort index was measured for each native mammal species and for the introduced wild boar, in two surveyed farms in Brazil’s Western Atlantic Forest range, through the use of camera trappings that were also used to verify if dogs and wild boar overlap in space and activity time. Wild boars seem to dominate the community, just a few years after their... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Canis familiaris; Sus scrofa; Activity time; Community composition; Niche overlap. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000104100 |
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| Silva-Camacho,Débora de S.; Santos,Joaquim N. de S.; Gomes,Rafaela de S.; Araújo,Francisco G.. |
| The aim of this study was to assess the ecomorphological patterns and diet of four Characiformes fish species in a poorly physically structured tropical reservoir. We tested the hypothesis that body shape and diet are associated, because environmental pressure acts on the phenotype, selecting traits according to the available resources. Ten ecomorphological attributes of 45 individuals of each species - Astyanax cf. bimaculatus (Linnaeus, 1758), Astyanax parahybae Eigenmann, 1908, Oligosarcus hepsetus (Cuvier, 1829), and Metynnis maculatus (Kner, 1858) - , collected between February and November 2003, were analyzed, and the patterns were assessed using Principal Components Analysis (PCA). Diet similarity among fish species was assessed using cluster... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Body shape; Diet; Freshwater fishes; Morphological diversity; Niche overlap. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000100004 |
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| Menin,Marcelo; Rossa-Feres,Denise de C.; Giaretta,Ariovaldo A.. |
| The objectives of this study were to measure and compare niche breadth and overlap of males of Hyla nana Boulenger, 1889 and Hyla sanborni Schmidt, 1944 in three neighboring ponds. The measured niche dimensions were seasonal occurrence, call site, and diet. The reproductive season of H. sanborni was longer in permanent ponds, whereas H. nana had a longer reproductive season in the temporary pond. Call site characteristics were similar for both species, however H. sanborni called from higher perches than H. nana. Diptera (Nematocera) were the most consumed item by both species in the three ponds but, in general, H. nana ingested larger prey than H. sanborni. For both species, the consumption of prey types was correlated with the availability in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hyla; Multidimensional overlap; Niche breadth; Niche overlap; Resource partitioning. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752005000100008 |
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| Registros recuperados: 13 | |
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