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Registros recuperados: 12
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Are food web structures well represented in isotopic spaces? ArchiMer
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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Complexity in trophic structure and stability in a modelled West African estuary ArchiMer
Villanueva, Ching-maria; Diouf, P.s.; Albaret, J.-j.; Moreau, J..
Un modèle Ecopath de l'estuaire du Sine-Saloum (Sénégal) comportant au total 37 groupes fonctionnels a été appliqué dans la présente étude en vue de déterminer les faits essentiels de ce système aquatique. La grande biodiversité spécifique des poissons de l'écosystème peut y jouer un rôle en assurant son intégrité, spécialement en présence de facteurs de stress, bien qu'il ait été observé que ce n'est pas entièrement le cas. Les résultats montrent qu'un autre facteur de mitigation est le niveau des forces d'interaction entre les groupes fonctionnels. La stabilité est accrue par des relations plus faibles et des pyramides plus courtes et plus larges. Bien que différentes questions se posent concernant les facteurs conduisant à la stabilité d'un système, les...
Tipo: Text Palavras-chave: Stabilité des systèmes; Sénégal; Omnivorie; Estuaire; Ecosystème côtier; Ecopath; Biodiversité; Afrique de l'Ouest; West Africa; System Stability; Senegal; Omnivory; Estuary; Ecopath; Coastal Ecosystem; Biodiversity.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-2554.pdf
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Diet and feeding behavior of Kyphosus spp. (Kyphosidae) in a Brazilian subtropical reef BABT
Silvano,Renato Azevedo Matias; Güth,Arthur Ziggiatti.
The present study analyzed and compared diet and feeding behavior (substrate use, position in water column, interactions with other fishes) of Kyphosus spp. (sea chubs) in a Brazilian subtropical reef. Juveniles (< 160 mm) of Kyphosus incisor consumed both algae and invertebrates, which were mainly calanoid copepods. Juvenile and small adults of also observed foraging in the water column. We thus provide the first record of omnivory for Kyphosids in the southwest Atlantic Ocean.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Herbivory; Kyphosidae; Omnivory; Ontogenetic diet shift; Coastal fishes.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000500012
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Effect of gossypol on survival and reproduction of the zoophytophagous stinkbug Podisus nigrispinus (Dallas) Rev. Bras. entomol.
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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Effects of Plant Species on Development of Wollastoniella rotunda (Hemiptera: Anthocoridae) OAK
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...
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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Effects of the introduction of an omnivorous fish on the biodiversity and functioning of an upland Amazonian lake Acta Amazonica
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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Feeding habits of Chaoboridae larvae in a tropical Brazilian reservoir BJB
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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Investigating trophic-level variability in Celtic Sea fish predators ArchiMer
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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Omnivory and resource - sharing in nutrient - deficient Rio Negro waters: stabilization of biodiversity? Acta Amazonica
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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Peixes onivoros da planicie inundavel do rio Miranda, Pantanal, Mato Grosso do Sul, Brasil. Infoteca-e
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; Alimentacao; Cadeia alimentar; Onivoria; Inseto; Rio Miranda; Pantanal; Mato Grosso do Sul; Brasil; Omnivorous fishes; Comunity; Feeding; Food chain; Omnivory; Insect; Brazil.
Ano: 2000 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/804413
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Phytophagous Neomegalotomus parvus (Westwood) (Hemiptera: Alydidae) feeding on carrion and feces Anais da SEB
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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Trophic ecology of the chiton Acanthopleura echinata on Chilean rocky shores RChHN
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
Registros recuperados: 12
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