Consulta: subjectFacets:"Resource partitioning"
Registros recuperados: 17
Data/hora: 06/06/2024 17:01:46

Feeding strategies and resource partitioning mitigate the effects of oligotrophy for marine cave mysids
Provedor de dados: 5
Autores: Rastorgueff, Pierre-alexandre; Harmelin-vivien, Mireille; Richard, Pierre; Chevaldonne, Pierre.
We investigated how large populations of several mysid species can coexist in oligo trophic underwater marine caves and their relationships in the marine cave food web using carbon and nitrogen stable isotopes. Isotopic signatures indicate food partitioning among the 5 species of cave-dwelling mysids from the northwest Mediterranean Sea we studied. Hemimysis speluncola feeds mainly on phytoplankton and zooplankton from outside the caves, Siriella gracilipes on sedimentary organic matter and zooplankton from outside, Harmelinella mariannae on small cave-dwelling crustaceans, and Hemimysis margalefi and Hemimysis lamornae mediterranea on sedimentary particulate organic matter. These differences in diet could promote coexistence of such diverse and abundant...
Tipo: Text
Palavras-chave: Trophic ecology; Resource partitioning; Mysidacea; Marine caves; Oligotrophy; Stable isotopes; NW Mediterranean.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00372/48307/48426.pdf

Dolphins and African apes: comparisons of sympatric socio-ecology
Provedor de dados: 16
Autores: Bearzi, M.; Stanford, C.B.
Dolphins and African apes are distantly related mammalian taxa that exhibit striking convergences in their socioecology. In both cetaceans and African apes, two or more closely related species sometimes occur in sympatry. However, detailed reviews of the ways in which sympatric associations of dolphins and apes are similar have not been done. As field studies of dolphins and apes have accumulated, comparisons of how the two groups avoid direct food competition when in sympatry have become possible. In this paper we review sympatric ecology among dolphins and African apes, and examine convergences in species-associations in each taxa. We review evidence for hypotheses that seek to explain avoidance of food competition, and consider whether ape-dolphin...
Tipo: Article / Letter to the editor
Palavras-chave: Sympatry; Convergence; Resource partitioning; 42.84.
Ano: 2007
URL: http://www.repository.naturalis.nl/record/262646

First come, first serve: " sit and wait" behavior in dung beetles at the source of primate dung
Provedor de dados: 82
Autores: Jacobs,Jennifer; Nole,Inés; Palminteri,Susanne; Ratcliffe,Brett.
Dung beetles (Coleoptera: Scarabaeidae: Scarabaeinae) compete intensively for dung resources, and most species forage in the understory. Here, we describe the unique behavior of one dung beetle species, Canthon aff. quadriguttatus (Olivier), associated with two species of monkeys from Peru. We observed this beetle species on the genital and anal regions of the brown titi monkey, Callicebus brunneus (Wagner), and subsequently falling with dung as the monkeys defecated. The same association was also observed with the bald-faced saki monkey, Pithecia irrorata irrorata (Gray). Using the " sit and wait" at the source behavior, C. quadriguttus may arrive first at the dung resource, possibly out-competing other dung beetle species. This paper is the first report...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Competition; Resource partitioning; Phoresy; Niche specialization.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2008000600003

Proboscis Length and Resource Utilization in Two Uruguayan Bumblebees: Bombus atratus Franklin and Bombus bellicosus Smith (Hymenoptera: Apidae)
Provedor de dados: 82
Autores: Arbulo,N; Santos,E; Salvarrey,S; Invernizzi,C.
Bumblebees (Bombus sp.) are eusocial insects with an annual life cycle whose use as pollinator of crops has gained great importance in modern agriculture. Several authors have found that resource use in Bombus species is usually based on the correlation between the proboscis length of the bumblebees and the corolla depth of the flowers. The aim of this study was to determine proboscis length of Bombus atratus and B. bellicosus, two Uruguayan bumblebees, and verify the resource exploitation testing two cultivated species, the red clover and the bird's foot trefoil. Bumblebee foraging activity was recorded in two culture conditions: in a red clover and bird's foot trefoil mixed meadow, and in contiguous plots of these legumes, and the proboscis length of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Native bee; Resource partitioning; Tongue length.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000100010

Feeding ecology of three juvenile mojarras (Gerreidae) in a tropical estuary of northeastern Brazil
Provedor de dados: 83
Autores: Araújo,Antônio Limeira Felinto de; Dantas,Renato Pereira; Pessanha,André Luiz Machado.
ABSTRACT Distributions and feeding ecology of mojarra species from shallow water of a tropical estuary in Northeastern Brazil were observed aiming to investigate differences in distribution and resource partitioning among juveniles of three species of mojarras. Fishes were collected with a beach seine across four sites along a salinity gradient from January to December of 2011. Highest abundances were recorded during the rainy season in the upper and middle estuary. Microcrustaceans, mainly copepods, were the preferential prey items of all mojarras, irrespective of size or hydrological season, suggesting these areas may be important nursery habitats. Juveniles of mojarra used two important mechanisms for exploitation of resources: (1) spatial segregation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Distribution; Estuarine fishes; Resource partitioning; Shallow water.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100220

Ecomorphology and resource use by dominant species of tropical estuarine juvenile fishes
Provedor de dados: 83
Autores: Pessanha,André Luiz Machado; Araújo,Francisco Gerson; Oliveira,Ronnie Enderson M. C. C.; Silva,Adna Ferreira da; Sales,Natalice Santos.
Eleven ecomorphological attributes and diet of seventeen juvenile fish species were examined to test the hypothesis that morphological patterns determine resource uses in estuarine habitats. Species were separated according to the apparatus to food capture and habitat use (benthic or pelagic) in three different groups: (1) a group with depressed fish body, strong caudal peduncle and enlarged pectoral fins; (2) a second group laterally flattened with a wide protruding mouth, and (3) a third group strongly flattened with small pectorals fins. The following six trophic groups were organized based on prey categories: Zooplanktivores, Benthivores, Omnivores, Detritivores, Macrocarnivores and Insectivores. Significant results (PERMANOVA) between ecomorphological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diets; Estuary; Habitats; Morphology; Resource partitioning.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200401

Ecomorphological patterns of the fishes inhabiting the tide pools of the Amazonian Coastal Zone, Brazil
Provedor de dados: 83
Autores: Soares,Bruno Eleres; Ruffeil,Tiago Octavio Begot; Montag,Luciano Fogaça de Assis.
The present study was based on the identification of the ecomorphological patterns that characterize the fish species found in tide pools in the Amazonian Coastal Zone (ACZ) in the Pará State, Brazil. Representatives of 19 species were collected during two field campaigns in 2011. The dominance, residence status, and trophic guild of each species were established, and morphometric data were obtained for up to 10 specimens of each species. A total of 23 ecomorphological attributes related to locomotion, position in the water column, and foraging behavior were calculated for the analysis of ecomorphological distance. Principal Component Analysis (PCA) was utilized for the evaluation of ecomorphological attributes that explained the variation among species....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecomorphology; Habitat use; Resource partitioning; Intertidal zone; Estuaries.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000400845

DIET OF DENDROPSOPHUS MICROCEPHALUS AND SCARTHYLA VIGILANS (ANURA: HYLIDAE) AT A LOCALITY IN NORTH-WESTERN VENEZUELA WITH NOTES ON MICROHABITAT OCCUPATION
Provedor de dados: 84
Autores: 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

Trophic ecology and microhabitat utilization by the Bufo gargarizans, Rana guentheri, and Rana limnocharis in southwestern China
Provedor de dados: 103
Autores: Yu,Tonglei; Guo,Yanshu.
We studied the trophic ecology and microhabitat use of the Asiatic toad, Bufo gargarizans Cantor, 1842; Guentheri frog, Rana guentheri (Boulenger, 1882); and the Ricefield frog, Rana limnocharis (Boie, 1834). These three species are common around Nanchong City, in southwestern China, where they live in the same habitat before hibernation. The main objective of this study was to analyze the diets and patterns of coexistence relative to the microhabitat of each species. In the Asiatic toad, based on index of relative importance, the diet was dominated by adult Coleoptera, Isopoda, and Hymenoptera (29.53%, 22.07%, and 15.20%, respectively), while the Guenther's frog and Ricefield frog ingested predominantly Orthoptera (67.44% and 40.94%, respectively). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anuran; Asiatic toad; Diet; Guentheri frog; Habitat; Resource partitioning; Ricefield frog.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702012000100006

The coexistence of species La coexistencia de especies
Provedor de dados: 97
Autores: GORDON,CALEB E.
This paper is a critical literature review on the topic of the coexistence of similar species within ecological communities. A conceptual framework is provided for dividing coexistence studies and concepts into three distinct time scales. The first six sections deal primarily with ecological-scale, or mesoscale coexistence, defined as coexistence in the classic sense of the competitive exclusion principle and Lotka-Volterra models, wherein interacting populations have had enough time to reach equilibrium. The first four sections briefly review resource partitioning studies and competitive coexistence models, and discuss the relative contributions of, and interaction between empirical and theoretical approaches to the problem of ecological-scale...
Tipo: Journal article
Palavras-chave: Coexistence; Competition; Community structure; Resource partitioning; Niche.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000100016

Activity patterns of nine phyllostomid bat species in a fragment of the Atlantic Forest in southeastern Brazil
Provedor de dados: 104
Autores: Aguiar,Ludmilla Moura de Souza; Marinho-Filho,Jader.
Seasonal, monthly and hourly activity patterns of nine bat species were studied based on their capture rates at the Reserva Particular do Patrimônio Natural Feliciano Miguel Abdala (RPPN-FMA), Caratinga, Minas Gerais state, southeastern Brazil. The frugivorous and nectarivorous bat species have their activity closely related to the availability of food. Divergence in monthly and hourly activity is discussed for pairs of similar species and the hypothesis of reduction in competition for nectarivorous and frugivorous species are rejected. Further studies on frugivores-plants interactions should be conducted to assess the long term consequences for the whole system at the RPPN-MFA.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chiroptera; Phyllostomidae; Resource partitioning; Temporal activity.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752004000200037

Resource use and coexistence of two syntopic hylid frogs (Anura, Hylidae)
Provedor de dados: 104
Autores: 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

Partição de recursos florais de espécies de Sida Linnaeus e Malvastrum coromandelianum (Linnaeus) Garcke (Malvaceae) entre Cephalurgus anomalus Moure &amp;amp; Oliveira (Hymenoptera, Andrenidae, Panurginae) e Melissoptila cnecomala (Moure) (Hymenoptera, Apidae, Eucerini)
Provedor de dados: 104
Autores: Morato,Elder Ferreira; Campos,Lúcio Antônio de O.
The flowering pattern and the visiting bee species on Sida spp. and Malvastrum coromandelianum (L.) Garcke were studied in a restricted area at the campus of the Universidade Federal de Viçosa, Minas Gerais, Brazil. There were differences among plant species but not among individuals in relation to the flowering time along the day and the time at which the flowers were visited by bees. Melissoptila cnecomala (Moure, 1944) and Cephalurgus anomalus Moure &amp;amp; Oliveira, 1962 were the most frequent visitors. Both species foraged on flowers for nectar and pollen. C. anomalus visited mainly plants with anthesis in the morning and M. cnecomala plants with anthesis in the afternoon. This fact sugests that those species of bees may be showing contrasting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malvaceae; Sida; Malvastrum; Bees; Resource partitioning.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000300016

Interactions between carpenter bees and orchid bees (Hymenoptera: Apidae) in flowers of Bertholletia excelsa Bonpl. (Lecythidaceae)
Provedor de dados: 36
Autores: Santos,Charles Fernando dos; Absy,Maria Lúcia.
Competition between two species of bees for the same type of floral resource may generate antagonistic behavior between them, especially in cultivated areas where food resources are limited, seasonally and locally. In this study, was tested the hypothesis of antagonism between two solitary bee species of the family Apidae, Eulaema mocsaryi (Euglossini) and Xylocopa frontalis (Xylocopini), visiting the Brazil nut flowers (Bertholletia excelsa: Lecythidaceae) in a central Amazonia agricultural area. The visitation time was analyzed to detect the possible temporal overlap in the foraging of these bees. Furthermore, was analyzed their interspecific interactions for manipulating flower species visited by an opponent species, as well as attempts to attack this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antagonism; Behaviors; Facilitation; Resource partitioning; Pollinators.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672012000100011

Preliminary data on the feeding habits of the freshwater stingrays Potamotrygon falkneri and Potamotrygon motoro (Potamotrygonidae) from the Upper Paraná River basin, Brazil
Provedor de dados: 49
Autores: Silva,Thiago Buosi; Uieda,Virgínia Sanches.
Stingrays of the Potamotrygonidae family are a singular group of Neotropical ichthyofauna. Although ancient reports exist about the group, there are still many questions that need to be clarified, such as the biology of the species that occur in the Paraná-Paraguay River system. In the present work, the diet of Potamotrygon falkneri and Potamotrygon motoro, captured in the Upper Paraná River, downstream from the Engenheiro Souza Dias Hydroelectric Power Station (UHE Jupiá), was analyzed. Both species showed a diversified diet, consisting of 14 food items, including Mollusca, Crustacea, Insecta and fish, with the predominance in diversity and abundance of aquatic insects. Only one individual of each species ingested fish. Potamotrygon motoro consumed mainly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Rays; Resource partitioning; Microhabitat.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032007000100027

The coexistence of endemic species of Astyanax(Teleostei: Characidae) is propitiated by ecomorphological and trophic variations
Provedor de dados: 49
Autores: Mise,Fabio Teruo; Fugi,Rosemara; Pagotto,João Paulo Alves; Goulart,Erivelto.
The aim of the present study was to evaluate factors that may favor the coexistence of three endemic species of Astyanax (Astyanax bifasciatus,Astyanax minor and Astyanax gymnodontus) in Segredo Reservoir (Iguaçu River, Paraná State, Brazil), and to test the hypothesis that these species share food resources, being the dietary variations related to morphological characteristics. Fish were collected at three samplings sites in 1993 and 1994, during the first year after the filling phase of the reservoir. The diet was assessed using stomach content analysis and ecomorphology by ecomorphological indices. Diet and ecomorphology data were ordinated by multivariate techniques (DCA and PCA, respectively), aiming to characterize trophic guilds and identify...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish; Resource partitioning; Ecomorphological divergence; Iguaçu River; Segredo reservoir.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000300021

Feeding habits and microhabitat utilization by two syntopic Brazilian Amazonian frogs (Hyla minuta and Pseudopaludicula sp. (gr. falcipes)
Provedor de dados: 57
Autores: VAN SLUYS,M.; ROCHA,C. F. D.
We studied the feeding habits and microhabitat use of the Amazonian frogs Hyla minuta and Pseudopaludicula sp. at Serra Norte, Carajás, Brazil. Although living syntopically, the two species differed markedly in both prey types and sizes. Standardized feeding niche breadth of H. minuta (Bst = 0.572) was larger than that of Pseudopaludicula sp. (Bst = 0.149) and their feeding niche overlap was considerably low (10.5%). The two frog species also differed in microhabitat use. When active, Pseudopaludicula sp. were found partially submerged at the lake border whereas H. minuta were found predominantly on Nymphaea sp. leaves. Although we have not evaluated taxonomic effects on diet composition, differences in diet may be partially explained by differences in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Frogs; Resource partitioning; Syntopy.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400003