Food Webs
Mostrando 13-24 de 69 artigos, teses e dissertações.
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13. Modificações comportamentais em aranhas orbitelas Araneae: Tetragnathidae, Nephilidae, Araneidae) atacadas por vespas parasitóides (Ichneumonidae, Pimplinae, Polysphinctini)
Parasitoid wasps use a wide diversity of arthropods as food for their larvae. Among the koinobiont species, (those whose development of the parasitoid does not interrupt the normal activities of the host), there is a group of wasps that it uses exclusively spiders as host. In the group, Polysphincta (Hymenoptera, Ichneumonidae, Pimplinae), some species are a
Publicado em: 2009
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14. Text not informed by the author. / Evolução do cleptoparasitismo em Argyrodes elevatus (theridiidae, aranae)
Kleptoparasitism is an animal interaction consisting in stealth of collected or processed food items. It occurs on many animal taxa. Among spiders, the subfamily Argyrodinae (Araneae) is one of the groups with more kleptoparasite species. In this study, we present a set of different actions that the kleptoparasite Argyrodes elevatus can do in host spiders we
Publicado em: 2009
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15. Sucessão ecológica em parcelas orgânicas de madeira, macroalgas e em carcassas de baleia no mar profundo; e similaridade de espécies entre habitats redutores no talude continental da Califórnia (Pacífico Nordeste) / Whales, wood and kelp islands in the deep-sea: ecological succession and species overlap with other chemosynthetic habitats in the Californian continental slope (NE Pacific)
Sunken parcels of macroalgae, wood and whale carcasses provide important oases of organic enrichment at the deep-sea floor, but sediment community structure and succession around these habitat islands are poorly evaluated. We experimentally implanted parcels of kelp and wood falls nearby a 30-ton deep-sea whale-fall at 1670 m in the Santa Cruz Basin (SCr; NE
Publicado em: 2009
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16. Tenacidade e investimento em seda em aranhas de teia orbicular / Tenacity and silk investment in orb web spiders
The origin of the most diverse branch of orbweavers, the Araneoidea, coincides with the origin of the viscid silk in the group Orbiculariae. Many hypotheses were proposed to explain the increased diversity in Araneoidea, however none of them explain this phenomena completely. The present work investigates a new hypothesis: the disappearance of the cribellate
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/04/2007
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17. Species assembly rules and the biodiversity-ecosystem functioning relationship / Regras entre assemblÃias de espÃcies: relaÃÃo entre biodiversidade e funcionamento do ecossistema
The biological diversity of ecosystems has important implications for their functioning. However, in order for reliable predictions to be made on the effects of species extinctions and/or additions on particular ecosystem functions, accurate knowledge is required on the ways in which species interact. These interactions in turn are important drivers of commu
Publicado em: 2007
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18. ASPECTOS DA BIOGEOQUIMICA DO MERCÚRIO EM LAGOS NA PLANICIE COSTEIRA DO SUL DO RIO GRANDE DO SUL
Mercury is one of the most hazardous contaminant in aquatic environment. Mercury contamination in aquatic environment food webs can be severe and persistent, and fish are a major source of mercury contamination in humans across food web. In this study: - Was measured mercury levels at three lakes in southern Brazil and assessed relationships between mercury
Publicado em: 2006
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19. Consumo e influência de exopolissacarideos de Anabaena spiroides (Cyanophyceae) sobre a toxicidade e captura do cobre por Ceriodaphnia cornuta (Cladocera, Daphnidae).
Human specie can alter deeply and very fast the enviroment in which it is in. Because of the industrial development, the water, air and soil contamination have become cause of concern, chiefly in big cities with great populations. Among the contaminants figure the heavy metals, which levels at aquatic and terrestrial ecossistems are growin up every year. The
Publicado em: 2004
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20. INFLUÊNCIA DO PULSO DE INUNDAÇÃO NA COMPOSIÇÃO ISOTÓPICA (d13C E d15N) DAS FONTES PRIMÁRIAS DE ENERGIA NA PLANÍCIE DE INUNDAÇÃO DO RIO PARAGUAI (PANTANAL MS) / SEASONAL PATTERN DETERMINING PRIMARY ENERGY SOURCES d13C AND d15N IN THE PARAGUAY RIVER FLOODPLAIN TROPHIC WEB, PANTANAL WETLAND - BRAZIL
The food web of the Pantanal wetland in Brazil was investigated during a complete hydrologic cycle (1998-99) using a multiple stable isotope approach (d13C and d15N) with the goal of identifying the primary carbon sources, which drive the system energy flux. The sampling was done in a representative marginal lake (Baía do Castelo) of Paraguay River floodpla
Publicado em: 2003
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21. Comportamento predatório, dispersão e reprodução em colonias de anelosimus jabaquara (Araneae: Theridiidae), na Serra do Japi, Jundiai, SP
The predatory behavior is one of the most important aspects in formation and maintenance of social structures in spiders. The collective prey consumption in spiders colonies could promote dominance systems which result in an asymmetrical access to food. At this situation could occur an asynchronous development and differences in females nutritional state, in
Publicado em: 1999
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22. Ecologia de populações da aranha Porrimosa lagotis (Lycosidae) nas reservas da Mata de Santa Genebra, Campinas (SP) eSerra do Japi, Jundiai (SP)
Porrimosa lagotis (Holmberg) is a South-american web-building spider of the Family Lycosidae. It is an exception in this family, that is composed mainly by wandering spiders. From May of 1990 to January of 1992, ecological aspects of two populations of P. lagotis were studied in the following forest areas: Serra do Japi (Jundiaí - SP) and Reserva de Santa G
Publicado em: 1996
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23. Food webs and the dimensionality of trophic niche space
If the trophic niche of a kind of organism is a connected region in niche space, then it is possible for trophic niche overlaps to be described in a one-dimensional niche space if and only if the trophic niche overlap graph is an interval graph. An analysis of 30 food webs, using the combinatorial theory of interval graphs, suggests that a niche space of dim
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24. Food-web structure and network theory: The role of connectance and size
Networks from a wide range of physical, biological, and social systems have been recently described as “small-world” and “scale-free.” However, studies disagree whether ecological networks called food webs possess the characteristic path lengths, clustering coefficients, and degree distributions required for membership in these classes of networks. O
The National Academy of Sciences.