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A continuous model of biomass size spectra governed by predation and the effects of fishing on them ArchiMer
Benoit, Eric; Rochet, Marie-joelle.
A new time-dependent continuous model of biomass size spectra is developed. In this model, predation is the single process governing the energy flow in the ecosystem, as it causes both growth and mortality. The ratio of predator to prey is assumed to be distributed: predators may feed on a range of prey sizes. Under these assumptions, it is shown that linear size spectra are stationary solutions of the model. Exploited fish communities are simulated by adding fishing mortality to the model: it is found that realistic fishing should affect the curvature and stability of the size spectrum rather than its slope.
Tipo: Text Palavras-chave: Predation; Mortality; Growth; Biomass size spectrum; Allometry.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-665.pdf
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A model of nematode dynamics in the Westerschelde Estuary OMA
Li, J.; Vincx, M.; Herman, P.M.J..
We developed a time dynamic model to investigate the temporal dynamics of nematode community in the brackish zone of the Westerschelde Estuary. The biomass of four nematode feeding groups observed from March 1991 to February 1992 is used to calibrate the model. Using environmental data as the input, the model predicts the temporal modification and interrelation of four nematode feeding groups. Nematodes achieve a dominant position in the community because of their lower loss rate (in respiration, excretion and natural death). Predators which are deposit-feeding macrobenthos control the variations of dominant nematodes, such as omnivores and non-selective deposit feeders. Food availability causes modification only for rare nematodes such as epigrowth...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diatoms; Ecology; Food; Light; Marine nematodes; Meiobenthos; Population dynamics; Predation; Respiration; Temperature; Nematoda [Nematodes].
Ano: 1996 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7284
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A preliminary analysis of death cause, capture-related mortality, and survival of adult red deer in northwestern Patagonia Ecología austral
Flueck,Werner T; Smith-Flueck,Joanne M; Bonino,Never A.
The red deer (Cervus elaphus), among the world´s 14 most invasive exotic mammals, has recently arrived in Patagonia. Forty-seven deer were captured, marked with radio collars, and monitored in order to determine survival rates and identify causes of death. Net gunning from a helicopter allowed captures to be evenly distributed through the study area and in a timely manner. The absence of capture related mortality in our study agrees with previously reported low rates for this method. Animals were monitored for periods ranging from 5 to 2611 days. Ten animals provided censored values due to radio failures or being shot: they survived on average 811 days (SE = 221) after capture. Ten animals experienced natural deaths with an average time alive after capture...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Invasion; Cervus elaphus; Puma concolor; Predation; Disease; Radio telemetry; Population dynamics; Capture by net gunning.
Ano: 2005 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2005000100004
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Adult feeding moths (Sphingidae) differ from non-adult feeding ones (Saturniidae) in activity-timing overlap and temporal niche width. Repositório Alice
CAMARGO, N. F. de; CAMARGO, W. R. F. de; CORREA, D. do C. V.; CAMARGO, A. J. A. de; VIEIRA, E. M..
Abstract According to classic ecology, resource partitioning by segregation along at least one of the three main niche axes (time, food, and space) must take place for the coexistence of species with similar ecological requirements. We used nocturnal light traps to investigate the assemblage structuration of two moth families: Sphingidae (23 species) and Saturniidae (13 species). Because competition for food among adults potentially occurs only among sphingids, only for this family did we expect less overlap of diel activity patterns than expected by chance and also a greater temporal niche width compared to saturniids. Moreover, we expected a greater number of sphingid species pairs to differ in activity timing compared to saturniid pairs. We also...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Cronobiologia; Traça; Praga de planta; Competição biológica; Lepidoptero; Moths; Plant pests; Ecological competition; Sphingidae; Saturniidae; Predation.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1036152
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Alimentação de Serrasalmus maculatus (Kner, 1858) (Characiformes; Serrasalmidae) no trecho inferior bacia do rio Sorocaba, São Paulo, Brasil - DOI: 10.4025/actascibiolsci.v30i3.5011 Biological Sciences
Villares Junior, Gilberto Aparecido; UNESP; Gomiero, Leandro Muller; UNESP; Goitein, Roberto; UNESP.
O objetivo foi abordar a alimentação de Serrasalmus maculatus. A captura dos exemplares foi realizada com a utilização de redes de emalhar de malhas entre 3 a 8 cm entre nós opostos, totalizando 100 m. Foram coletados 107 indivíduos com comprimento-padrão variando entre 62 e 210 mm, representados principalmente por fêmeas e imaturos. Nenhum indivíduo foi capturado em temperaturas inferiores a 21ºC. Ocorreram quatro categorias de itens alimentares nos estômagos analisados, a saber: pedaços de musculatura de peixe, partes de nadadeiras, fragmentos de vegetais e insetos. Foram feitas comparações entre as classes de comprimento mostrando que ocorrem diferenças significativas nos itens alimentares consumidos na maioria dessas classes. A partir da...
Palavras-chave: 2.00.00.00-6 Ciências Biológicas dieta; Piranhas; Predação; Rio Sorocaba. diet; Piranhas; Predation; Sorocaba river.
Ano: 2008 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5011
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Alimentación de la merluza (Merluccius hubbsi) en el Golfo San Jorge y aguas adyacentes OceanDocs
Sánchez, F..
The information obtained in summer research cruises carried out in 1995, 1999 and 2002 allowed to determine the trophic spectrum of common hake (Merluccius hubbsi) and to estimate anchovy (Engraulis anchoita) and hake consumption in the nursery area of the San Jorge Gulf and shelf adjacent waters (Argentine Sea, SW Atlantic). The area surveyed extended from 44ºS to 47ºS and between the 50-100 m isobaths. In the stomach content the most frequent items were crustaceans followed by fish. In all size groups sampled the presence of anchovy and common hake was observed. In the area assessed consumption of anchovy, weighted for the three summer months of 1995 was 56,639 t. The greatest predation pressure was observed on classes between 14-16 cm TL. Hake...
Tipo: Journal Contribution Palavras-chave: Predation; Trophic relationships; Marine environment; Predation; Marine environment; Http://aims.fao.org/aos/agrovoc/c_6162; Http://aims.fao.org/aos/agrovoc/c_4610.
Ano: 2009 URL: http://hdl.handle.net/1834/3457
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Alimentación de Squalus acanthias y predación sobre Merluccius hubbsi en el Mar Argentino entre 34°47'-47°S. OceanDocs
Garcia de la Rosa, S.B.; Sánchez, M.F..
The spiny dogfish, Squalus acanthias is an euribatic, euritermic and cosmopolitan specie. In the Argentine Sea it consumes diversity of preys, characteristic of a generalist and oportunist feeder, butits principal food items are ctenophores, fishes and cephalopods.Diet overlap between sexes was found between 34°-37°S and 101-150 m,where males principally feed on fishes, squid and polichaetes,sharing only ctenophores and hake consumption with the females. Near 62 cm TL there is a shift in the diet, due to an increment of argentine hake Merluccius hubbsi and squid Illex argentinus predation and a diminution in ctenophores Pleurobrachia pileus eating. Feeding shows an increment from north to south, its mode on 42°-43°S.Argentine hake is an important prey...
Tipo: Journal Contribution Palavras-chave: Feeding behaviour; Predation; Stomach content; Trophic relationships; Feeding behaviour; Predation; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_6162.
Ano: 1997 URL: http://hdl.handle.net/1834/1938
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An Antitrust Economic Analysis of Stop & Shop's Proposed Acquisition of the Big V Shop Rite Supermarket Chain AgEcon
Cotterill, Ronald W..
In early 2002, the Royal Ahold subsidiary, Stop & Shop Supermarkets, offered to purchase the Big V supermarket chain, which was in bankruptcy court after three successive, unsuccessful leveraged buyouts over the past ten years. At a later date, Pathmark Supermarkets joined the offer to purchase. Big V was Wakefern Food Corporation’s largest member. The acquisition was a horizontal merger in at least three local markets, Newburgh NJ, Poughkeepsie NY, and Trenton NJ. This research was conducted for the Wakefern Food Corporation who provided much of the underlying data and information. We presented this report to the Bureau of Competition, Federal Trade Commission in March 2002 and to the New Jersey and New York Attorney Generals, Antitrust Section in...
Tipo: Working or Discussion Paper Palavras-chave: Horizontal merger; Market power; Predation; Agribusiness; Industrial Organization.
Ano: 2002 URL: http://purl.umn.edu/25194
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Análise de sobrevivência e germinação em plantios de Araucaria angustifolia derivado de mudas e sementes. Repositório Alice
MARAN, J. C.; ROSOT, M. A. D.; RADOMSKI, M. I.; KELLERMANN, B..
O bioma florestal mais característico do Sul do Brasil é a Floresta Ombrófila Mista, fortemente marcada pela presença da espécie Araucaria angustifolia. Entretanto, a exploração irracional e descontrolada desta espécie reduziu drasticamente sua área de ocorrência a 2% de sua área original. Assim, esforços devem ser feitos para auxiliar e promover sua regeneração natural, visando a sua preservação e o uso sustentável de seus recursos econômicos. Com o objetivo de avaliar a germinação, sobrevivência e predação de mudas e sementes de Araucaria angustifolia foi implantado um experimento em delineamento inteiramente casualizado, no qual foram investigados os efeitos de dois fatores com dois níveis cada (tipo de plantio: puro/ misto; material plantado:...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Predação; Paraná pine nuts; Araucaria angustifolia; Pinheiro do Paraná; Espécie nativa; Fauna; Pinhão; Fauna; Predation.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1066529
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Anti-predator response of Haliotis tuberculata is modified after only one generation of domestication ArchiMer
Roussel, Sabine; Bisch, T; Lachambre, S; Boudry, Pierre; Gervois, Jl; Lambert, Christophe; Huchette, S; Day, R.
Domestication of Haliotis tuberculata has only recently begun. During the process, we expect that behavioural and physiological traits may evolve to become more adapted to their captive environment. These modifications may result from intentional selection of production traits or unconscious and unintentional selection due to conditions experienced in the farm environment. To study this process at the earliest stage, the progeny of 3 different broodstocks obtained from wild parents, selected farmed abalone and randomly sampled farmed abalone, were studied. After rearing for 16 mo in separate tanks, offspring from the 3 progenies were placed together in sea cages at the same density. After 3 yr, behavioural traits were studied, and the immune status after a...
Tipo: Text Palavras-chave: Predation; Hiding behaviour; Haliotis tuberculata; Domestication; Selection; Captive; Abalone.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00487/59841/62989.pdf
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Ants as predators of the egg parasitoid Trichogramma cacoeciae (Hymenoptera: Trichogrammatidae) applied for biological control of the olive moth, Prays oleae (Lepidoptera: Plutellidae) in Portugal IPB - Escola Superior Agrária
Pereira, J.A.; Bento, Albino; Cabanas, J.E.; Torres, L.; Herz, A.; Hassan, S.A..
The detrimental effect of predators on Trichogramma cacoeciae March. releases to control the olive moth, Prays oleae Bern., in the Trás-os-Montes region (Northeast of Portugal), was evaluated during three releases against the flower generation of the pest in 2002. At 1 and 3 h and at 1, 3, 7 and 14 days after each release, 30 Trichogramma releasing cards were examined in the field and predators were collected and identified. Furthermore, at 1, 3, 7 and 14 days after each release, the percentage of egg predation on the cards was also determined. Formicidae were the most abundant group of predators at 99.1% of the total individuals collected. Ten species were identified, Camponotus aethiops, C. lateralis, C. piceus, C. truncatus, Crematogaster auberti, C....
Tipo: Article Palavras-chave: Inundative releases; Predation; Ants; Trichogramma; Olive moth; Biological control.
Ano: 2004 URL: http://hdl.handle.net/10198/724
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Anuran larvae as prey and hosts of invertebrates in neotropical aquatic habitats RChHN
Gambale,Priscilla Guedes; Batista,Vinícius Guerra; Oda,Fabrício Hiroiuki; Campos,Renata Mayara; Takemoto,Ricardo Massato; Bastos,Rogério Pereira.
BACKGROUND: Biotic processes, such as predation and parasitism events, are crucial for answering questions in ecology and evolution. Here, we report predation and ectoparasitism events of invertebrates upon tadpoles in aquatic habitats of southern Brazil. FINDINGS: Four lentic water bodies were sampled twice a month (December 2012 to March 2013). Those water bodies were located in the Diamante do Norte County, State of Paraná, southern Brazil. The tadpoles, Dendropsophus aff. minutus, Hypsiboas raniceps, Scinax fuscovarius, Physalaemus cuvieri and Elachistocleis bicolor were observed being predated by six different invertebrate predators. However, Leptodactylus fuscus and Pseudis sp. were also recorded on the same water bodies and were not observed being...
Tipo: Journal article Palavras-chave: Tadpoles; Anura; Predation; Parasitism; Brazil.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100026
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Assessment and Management of Invasive Alien Predators Ecology and Society
Park, Kirsty; University of Stirling; k.j.park@stir.ac.uk.
Although invasive alien species have been identified as the second greatest threat to biodiversity after habitat loss, characterizing and quantifying their impacts on native species and habitats remains a fundamental problem in conservation biology. Here, I review the techniques that are currently used to assess the impact of invasive alien species on biodiversity, highlighting both their uses in invasive species ecology and their limitations in establishing a causal relationship. Adopting a hypothesis-driven experimental approach to impact assessment, and to eradication efforts through adaptive management, would benefit our ecological understanding of invasive species without delaying critical management action that could reduce the spread of invasive...
Tipo: Peer-Reviewed Reports Palavras-chave: Adaptive management; Experimental; Impact assessment; Invasive alien species; Predation.
Ano: 2004
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Biologia e consumo do predador Callida sp. (Coleoptera: Carabidae) criado em Anticarsia gemmatalis Hubner, 1818. Repositório Alice
CORREA-FERREIRA, B.S.; POLLATO, S.L.B..
Com o objetivo de conhecer a biologia e o potencial de consumo do carabideo predador Callida sp., conduziram-se estudos de laboratorio em Londrina, PR. Sob as condicoes de 26oC ñ 2o C de temperatura a 60% ñ 10% de umidade relativa, a duracao media para o periodo de ovo a adulto foi de 32 dias, verificando-se que a maior mortalidade ocorreu no terceiro instar larval (26,67%). Quanto ao peso do corpo das larvas, constatou-se que o acrescimo maior (7,73 mg) ocorreu tambem no terceiro instar. O consumo total medio do periodo larval foi de 0,63, 1,93 e 6,20 lagartas para o primeiro, segundo o terceiro instares, respectivamente. Considerando-se que os adultos de Callida sp. consumiram uma media diaria de 48,10 lagartas pequenas e tiveram uma longevidade media de...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Inseto; Entomologia; Predador; Controle biologico; Nutricao; Predacao; Insect; Predation; Nutrition; Biology; Anticarsia Gemmatalis; Biologia; Callida sp; Biological control; Entomology.
Ano: 1989 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/444596
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Biological aspects of the genus Brachistosternus (Bothriuridae) in the Atacama Desert (Chile), with the description of a new type of pedipalp macroseta Gayana
Ojanguren-Affilastro,Andrés A.; Botero-Trujillo,Ricardo; Castex,Alberto; Pizarro-Araya,Jaime.
ABSTRACT New data about several aspects of the biology of scorpions of genus Brachistosternus of the Atacama Desert are provided. Predatory techniques on tenebrionid larvae, and large spiders in their burrows are described, as well as the method used to transport large preys. The habitat of Brachistosternus mattonii Ojanguren-Affilastro 2005, by the tide line, is described for the first time. Finally a new type of pedipalp macroseta of Bothriuridae is described.
Tipo: Journal article Palavras-chave: Scorpiones; Brachistosternus; Atacama; Predation; Macroseta.
Ano: 2016 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382016000200169
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Biological parameters of Cydnodromus picanus and Phytoseiulus persimilis raised on the carmine spider mite, Tetranychus cinnabarinus (Acari: Phytoseiidae, Tetranychidae) Ciencia e Investigación Agraria
Tello,Víctor; Vargas,Robinson; Araya,Jaime; Cardemil,Antonieta.
The postembryonic development, consumption and life table parameters of Cydnodromus picanus Ragusa and Phytoseiulus persimilis (Athias-Henriot) were studied at 29.44 ± 1.47 °C and 42.35 ± 5.01% of RH with a photoperiod of 14:10 h (L:D) in order to evaluate the potential of these predators for feeding on the carmine spider mite Tetranychus cinnabarinus (Boisduval). Eggs, larvae and protonymphs of T cinnabarinus may be optimal food for C. picanus, which obtained survival rates of 100%, 97% and 93%, respectively, on them. The survival of P persimilis was around 6.7% with diets based on eggs, larvae and protonymphs, showing a high mortality level by dehydration when fed with eggs. The time of the postembryonic development was significantly shorter (p <...
Tipo: Journal article Palavras-chave: Biological control; Life table; Postembryonic development; Predation.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000200012
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Biology of the coccinelid Micraspis hirashimai (Sasaji) (Coleoptera: Coccinellidae) and its predation on some rice insect pests International Rice Research Institute
Ye Win.
93 l. : ill., photographs. Thesis (M.S.) -- Central Luzon State University
Tipo: Thesis Palavras-chave: Rice; Insect pests; Coccinellidae; Predatory insects; Predation; Micraspis hirashimai.
Ano: 1989 URL: http://hdl.handle.net/123456789/1081
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Center for Independent Experts (CIE) Review of the Status of the Eastern Oyster (Crassostrea virginica) ArchiMer
Goulletquer, Philippe.
NOAA’s National Marine Fisheries Services (NMFS) received a petition to list the Eastern oyster (Crassostrea virginica) as either threatened or endangered under the Endangered Species Act (ESA). The Eastern oyster is an emblematic species in the US coastal states, playing a significant role at various levels: shaping coastal social communities, providing a commercial activity (public fishery & aquaculture) and recreational - amenity benefits, and as a keystone species in highly diverse and sensitive ecosystems (estuaries). This petition is likely the result of concerns regarding the partial collapse of public fisheries in several states as well as from the resulting damages to this species induced by severe hurricanes. A Biological Review Team (BRT)...
Tipo: Text Palavras-chave: Biology; Habitat threats; Predation; Disease; Bivalvia; Crassostrea virginica; Oyster; Recommendations.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/00043/15458/12833.pdf
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Coexistence of surface and cave amphipods in an ecotone environment Naturalis
Luštrik, R.; Turjak, M.; Kralj-Fišer, S.; Fišer, C..
Interspecific interactions between surface and subterranean species may be a key determinant for species distributions. Until now, the existence of competition (including predation) between these groups has not been tested. To assess the coexistence and potential role of interspecific interactions between surface Gammarus fossarum and subterranean Niphargus timavi, and to determine their micro distributions, we conducted a series of field and laboratory observations. We aimed to determine: (1) species substrate preference, (2) whether the presence of G. fossarum influences the habitat choice of N. timavi, and (3) possible predation effects on micro habitat choice of small juveniles. Throughout a small river in SW Slovenia, N. timavi was predominantly found...
Tipo: Article / Letter to the editor Palavras-chave: Amphipoda; Cannibalism; Competition; Ecotone; Microhabitat preference; Predation; 42.74.
Ano: 2011 URL: http://www.repository.naturalis.nl/record/377199
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Comparaison de cinq indices alimentaires utilises dans l'analyse des contenus stomacaux ArchiMer
Rosecchi, E; Nouaze, Y.
Compound indices are often used in the analysis of fish stomach contents to characterize diet. Five of these indices, combining two or three measures of prey importance: weight, abundance and frequency of occurrence, are mathematically compared in this work. Data from a feeding study of sparid fish show that different indices can produce different results. Four classifications of food, in terms of preferences, are applied to Sparidae, compared and discussed. A new method of classifying the prey of fish into groups is proposed. It characterizes the main items in the diet, whatever feeding index is chosen for the analysis.
Tipo: Text Palavras-chave: Quantitative distribution; Weight; Predation; Stomach content; Feeding.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/publication-1773.pdf
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