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| Registros recuperados: 12 | |
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| Jabot, Franck; Giraldo, Carolina; Lefebvre, Sebastien; Dubois, Stanislas. |
| Isotopic analyses are increasingly used to assess the structure of food webs and a series of isotopic functional indices have been proposed in the last decade to characterize this structure. These indices are based on the foundational assumption that proximity in the isotopic space informs on trophic similarity between species. While it has been recognized for long that this simplifying assumption should be used with caution, no formal evaluation of its domain of validity has been performed to date. We here simulate a large number (15,000) of food webs with varying characteristics to assess i) whether isotopic distance is a good proxy of trophic dissimilarity; ii) whether isotopic functional indices are good proxies of trophic functional properties; and... |
| Tipo: Text |
Palavras-chave: Connectance; Isotopic functional indices; Niche model; Omnivory; Virtual ecology. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00385/49596/50110.pdf |
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| Evangelista Junior,Walter S.; Santos,Roberta L.; Torres,Jorge B.; Zanuncio,José C.. |
| Effect of gossypol on survival and reproduction of the zoophytophagous stinkbug Podisus nigrispinus (Dallas). Gossypol is a sesquiterpene aldehyde found in cotton plants conferring resistance against herbivory. Although the effect of this sesquiterpenoid on insect pests of cotton is known, the interaction of this compound with zoophytophagous predators such as Podisus nigrispinus (Dallas) (Hemiptera, Pentatomidae) has not been studied so far. Thus, the objective of this study was to evaluate the effect of the purified gossypol on nymphs and adults of P. nigrispinus. Nymphs and adults of this predator were fed on Tenebrio molitor pupae and supplemented with solutions of gossypol at concentrations of 0.00, 0.05, 0.10, and 0.20% (w/v) during the nymphal and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Asopinae; Host plant resistance; Omnivory; Zoophytophagy. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262011000200018 |
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| 上船, 雅義; 仲島, 義貴; 田頭, 栄子; 高林, 純示; 高木, 正見. |
| We studied the effects of plant species on the development of Wollastoniella rotunda under laboratory conditions. We reared newly emerged first instars of W. rotunda on eggs of Ephestia kuehniella together with one of four different plant leaves, eggplant, cucumber, kidney bean and tomato. As a control, we used either moist cotton wool or nothing instead of the plant leaves. In the absence of water, first instars died within a day, suggesting that the predator needs to acquire water from plants in order to survive. Survival rates of W. rotunda differed among plant species, being lowest on cucumber leaves when compared to eggplant or tomato leaves. The duration of instar development was not affected by plant species. When offered moist cotton wool, bugs... |
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Palavras-chave: Biological control; Omnivory; Plant feeding; Plant suitability; Wollastoniella rotunda. |
| Ano: 2008 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2584 |
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| NOBRE,Regina L. G.; CALIMAN,Adriano; GUARIENTO,Rafael D.; BOZELLI,Reinaldo L.; CARNEIRO,Luciana S.. |
| ABSTRACT The introduction of nonnative species is one of the main threats to freshwater ecosystems. Although omnivory and intraguild predation are common in those systems, little is known about the effects of introduced omnivorous fish on pelagic and littoral communities. This study tested predictions of food-web theory regarding the effects of omnivorous fish introduction on previously fishless lakes in the Amazonian uplands of Serra dos Carajás, Pará, Brazil. The trophic structure of two similar lakes, one with and the other without the introduced omnivorous fish Astyanax bimaculatus, was compared using a data series of biotic variables collected from both lakes twice a year from 2010 to 2013. Zooplankton was more abundant in the lake with fish, and the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Trophic cascade; Species translocation; Community structure; Biological invasions; Omnivory. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672019000300221 |
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| ARCIFA,M. S.. |
| The diet of the four larval instars of a Chaoboridae species of Lake Monte Alegre, was evaluated through the analysis of the crop content of individuals caught at night in the lake. Peridinium and zooflagellates were the major components of the diet of instars I and II, whereas microcrustaceans, especially the cladoceran Bosmina, were most important for late instars. When the preferential prey decreased, in the course of the year, the diet was more diversified, increasing the ingestion of Peridinium by instars III and IV. There is a relationship between the mouth diameter of the larvae and the maximum width, height, or diameter of the ingested organisms. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chaoboridae; Four instars; Diet; Zooplankton; Omnivory. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400008 |
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| Chassot, E; Rouyer, Tristan; Trenkel, Verena; Gascuel, D. |
| The trophic level mean and variance, and the degree of omnivory for five Celtic Sea fish predators were estimated using a database of stomach content records characterized by a high level of taxonomic resolution. The predators occupied a high position in the food web, i.e. 4.75 for Atlantic cod Gadus morhua, 444 for haddock Melanogrammus aeglefinus, 4.88 for European hake Merluccius merluccius, 5.00 for megrim Lepidorhombus whiffiagonis and 5.27 for whiting Merlangius merlangus. The level of taxonomic resolution of the prey did not greatly affect mean T-L predator values; an effect on variance was evident, low resolution masking intra-population variability in T-L. Generalized additive models (GAM) were used to explain the variability of predator T-L... |
| Tipo: Text |
Palavras-chave: Trophic level; Predation; Omnivory; Indicator; GAM; Food web. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4699.pdf |
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| Walker,Ilse. |
| Amazonian biodiversity is notorious, this is also valid for the fauna of the mineral-deficient waters of the Rio Negro System. Some 25 years of research on the benthic fauna of Central Amazonian streams resulted in species-rich foodwebs with a high degree of omnivory within dense animal communities. To exemplify the taxonomic range of omnivorous consumers, the detailed resource spectra of 18 consumer species, including Protozoa (2 species), Platyhelminthes (1 species), insects (2 species), fish (6 species) and shrimps (Decapoda, 7 species), associated primarily with the benthic habitats of Rio Negro tributaries, are presented. Special features of omnivory are characterized, and the importance of litter-decomposing fungi as essential energy input into the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazonas; Rio Negro; Omnivory. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672009000300017 |
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| RESENDE, E. K. de; PEREIRA, R. A. C.; ALMEIDA, V. L. L. de; SILVA, A. G. da. |
| Identificaram-se 24 especies de peixes onivoros na planicie de inundacao do rio Miranda (dois meandros abandonados, uma vazante e uma baia). Destas, 11 sao Characiformes, 9 Siluriformes e 4 Perciformes. Entre os Characiformes, 9 sao da familia Characidae, uma Parodontidae, e uma Anostomidae. Dentre os Siluriformes, uma pertence a familia Sternopygidae, 4 a Pimelodidae, 3 a Doradidae e uma a Callichthyidae. Dos Perciformes, todas pertencem a familia Cichlidae. Os alimentos consumidos por estas especies consitiram basicamente em insetos (terrestres e aquaticos), vegetais (terrestres e aquaticos), e microcrustaceos (cladoceros, ostracodos, conchostracos e copepodos). Outros alimentos ingeridos em quantidades expressivas, com menor frequencia, foram algas,... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Peixe onivoro; Comunidade; Onivoria; Rio Miranda; Mato Grosso do Sul; Brasil; Omnivorous fishes; Comunity; Feeding; Omnivory; Insect.; Alimentação; Cadeia Alimentar; Inseto.; Brazil; Pantanal; Food chain.. |
| Ano: 2000 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/804413 |
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| Ventura,Maurício U.; Silva,Jovenil J.; Panizzi,Antônio R.. |
| The phytophagous bug Neomegalotomus parvus (West.) feeds on pods and seeds of legumes. However, by the first time, in a laboratory colony, adults were found feeding on coespecific nymph and adult cadavers. Second instar nymphs, deprived of leguminous seeds, fed exclusively on died nymphs, reached the third instar. In the field, adults of N. parvus were found on animal carrions and feces, apparently feeding. Aggregations of adults were found on dog feces, as well. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Insecta; Heteroptera; Broatheaded bug; Omnivory. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80592000000400028 |
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| CAMUS,PATRICIO A; NAVARRETE,ARTURO H; SANHUEZA,ÁLVARO G; OPAZO,L. FELIPE. |
| Polyplacophorans are common herbivores on rocky shores, but basic aspects of their ecology remain scarcely studied and their role within communities could be more complex than previously considered. Such is the case of Acanthopleura echinata (Barnes), one of the largest and most conspicuous chitons in the world, and at the same time, one of the least known intertidal species in the southeastern Pacific. To improve the basic ecological knowledge of this potentially important intertidal consumer, we studied the diet of A. echinata and its variation among sites of varying levels of coastal upwelling spread over 1000 km along the coast of northern Chile. A seasonal evaluation of diet, body size distribution and density at sites expected to vary in overall... |
| Tipo: Journal article |
Palavras-chave: Body size; Intertidal; Niche breadth; Omnivory; Upwelling. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000100010 |
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| Registros recuperados: 12 | |
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