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Registros recuperados: 13
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A comparison of the trophic ecology of Beaufort Sea Gadidae using fatty acids and stable isotopes ArchiMer
Brewster, J. D.; Giraldo, Carolina; Choy, E. S.; Macphee, S. A.; Hoover, C.; Lynn, B.; Mcnicholl, D. G.; Majewski, A.; Rosenberg, B.; Power, M.; Reist, J. D.; Loseto, L. L..
Polar cod (Boreogadus saida) is one of the most studied Arctic marine fishes given its circumpolar distribution and centralised role in the Arctic marine food web. In contrast, relatively little is known about two other Arctic Gadidae: saffron cod (Eleginus gracilis) and Greenland cod (Gadus ogac). Climate change is expected to have an effect on sea ice-associated species, such as polar cod, but due to our lack of knowledge of other arctic gadid species it remains unclear how climate change will impact them and their interactions within the arctic marine ecosystem. Here, we explored the ecology of three Arctic Gadidae that co-occur in the Canadian Beaufort Sea. Stable isotope (SI) (niche overlap) and fatty acid (FA) (correspondence analysis and linear...
Tipo: Text Palavras-chave: Niche overlap; Fatty acids; Stable isotopes; Beaufort Sea; Cod.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00397/50797/54141.pdf
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Abiotic effects on the cover and richness of corticolous lichens on Araucaria angustifolia trunks Acta Botanica
Nunes,Lucas; Burle,Giulia; Gumboski,Emerson Luiz; Dechoum,Michele.
ABSTRACT Lichens play a key role in natural ecosystems, as they can function as primary producers, recycle minerals and fix nitrogen. Despite their environmental importance, little is known about lichen ecology in Brazil, and especially about how abiotic factors may influence their spatial distribution. In this study, we aimed to verify how the cover and richness of corticolous lichens on Araucaria angustifolia trunks vary between two different habitats (Forest and Grassland). The photoquadrat sampling method was applied to A. angustifolia trunks. The Coral Point Count software with Excel extensions (CPCe) was used to analyze photographs for lichen cover and richness. Additionally, a redundancy analysis was conducted to estimate how five abiotic and two...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ascomycota; Corticolous lichens; Environmental selectivity; Fungi; Lichen ecology; Niche overlap.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000100021
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Diet and ecomorphological relationships of an endemic, species-poor fish assemblage in a stream in the Iguaçu National Park Neotropical Ichthyology
Neves,Mayara Pereira; Delariva,Rosilene Luciana; Wolff,Luciano Lazzarini.
This study investigated the morphological and dietary relationships of the fish assemblage in a stream with an endemic fauna and low species richness. The ichthyofauna was sampled quarterly from September 2011 to July 2012, through the electrofishing technique. The stomach contents of 419 individuals belonging to seven species were analyzed by the volumetric method, and the ecomorphological traits of 30 specimens of each species were estimated. The main food items consumed were detritus, aquatic and terrestrial insects, and other aquatic invertebrates. We observed low levels of trophic niche breadth and diet overlap between most species. The PCA scores indicated the occurrence of three ecomorphotypes. PCA axis 1 segregated at one extreme, species with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Feeding ecology; Iguaçu River basin; Morphotypes; Niche overlap; Stream fishes.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000100245
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Diet and functional feeding groups of Chironomidae (Diptera) in the Middle Paraná River floodplain (Argentina) Iheringia, Sér. Zool.
Galizzi,M. Celeste; Zilli,Florencia; Marchese,Mercedes.
The gut contents of nine genera of benthic Chironominae and Tanypodinae from the Middle Paraná River floodplain habitats (a lake and a secondary channel) were analyzed to determine their feeding patterns and functional feeding groups. Amorphous detritus, animal and vegetal tissues, and mineral materials (predominantly sand) were observed in the larval guts. Amorphous detritus were the main food item found for Polypedilum (Tripodura) sp., Chironomus gr. decorus sp., Endotribelos sp., Phaenopsectra sp., Cladopelma sp., and Pelomus sp. (Chironominae), while animal tissues (mainly oligochaetes) were the most important food item found for Ablabesmyia (Karelia) sp., Coelotanypus sp., and Procladius sp. (Tanypodinae). Dietary overlap was calculated for all pairs...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gut content; Niche overlap; Chironominae; Tanypodinae.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000200001
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DIET OF DENDROPSOPHUS MICROCEPHALUS AND SCARTHYLA VIGILANS (ANURA: HYLIDAE) AT A LOCALITY IN NORTH-WESTERN VENEZUELA WITH NOTES ON MICROHABITAT OCCUPATION Pap. Avulsos de Zool. (São Paulo)
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
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DIET OF DIRECT-DEVELOPING FROGS (ANURA: CRAUGASTORIDAE: Pristimantis) FROM THE ANDES OF WESTERN COLOMBIA Acta biol.Colomb.
GARCIA-R,Juan Carlos; POSSO-GÓMEZ,Carmen Elisa; CÁRDENAS-HENAO,Heiber.
We studied the diet of 15 montane frog species of the genus Pristimantis (Craugastoridae) from the Andes of Western Colombia to determine the diet range, breadth of niche and overlap among species. We identified 499 prey items from stomach and intestinal contents of 154 specimens. Prey items were included in 74 different categories. The most common 15 prey categories accounted for 65 % of all frogs' diet. The invertebrate families Isotomidae, Chironomidae, Formicidae, and Tipulidae were the most abundant categories and accounted for 32 % of the frogs' diet. Ten of the 15 frog species were found with at least one item of Araneae. Coleoptera and Tipulidae were found in nine frog species, and Acari and Carabidae in eight frog species. In general, beetles were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Colombia; Diet; Niche breadth; Niche overlap; Pristimantis; Western Cordillera.
Ano: 2015 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2015000100009
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Ecology of colonizing populations of the figfly Zaprionus indianus (Diptera, Drosophilidae) in Porto Alegre, Southern Brazil Iheringia, Sér. Zool.
Silva,Norma Machado da; Fantinel,Carina da Conceição; Valente,Vera Lucia da Silva; Valiati,Vitor Hugo.
Ecological parameters such as trophic niche overlap and niche breadth were computed from the frequency of all drosophilid species collected in 2001 and 2002, in the urban area of Porto Alegre city, Brazil. Independently of place, drosophilids community composition and components breeding or feeding sites, the highest frequencies of Zaprionus indianus (Gupta, 1970) were obtained during seasons with higher average temperatures, especially during summer. From a total of the 19,146 individuals of Z. indianus sampled, 80% were found in this season. The data of trophic niche breadth suggest a higher opportunism of adult flies in feeding substrate use, but the females are still selective in oviposition substrate choice. For the values of niche overlap, only for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Drosophilids; Niche overlap; Niche breadth.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212005000300002
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Ecomorphological relationships among four Characiformes fish species in a tropical reservoir in South-eastern Brazil Rev. Bras. Zool.
Silva-Camacho,Débora de S.; Santos,Joaquim N. de S.; Gomes,Rafaela de S.; Araújo,Francisco G..
The aim of this study was to assess the ecomorphological patterns and diet of four Characiformes fish species in a poorly physically structured tropical reservoir. We tested the hypothesis that body shape and diet are associated, because environmental pressure acts on the phenotype, selecting traits according to the available resources. Ten ecomorphological attributes of 45 individuals of each species - Astyanax cf. bimaculatus (Linnaeus, 1758), Astyanax parahybae Eigenmann, 1908, Oligosarcus hepsetus (Cuvier, 1829), and Metynnis maculatus (Kner, 1858) - , collected between February and November 2003, were analyzed, and the patterns were assessed using Principal Components Analysis (PCA). Diet similarity among fish species was assessed using cluster...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Body shape; Diet; Freshwater fishes; Morphological diversity; Niche overlap.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000100004
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Feeding and reproductive patterns of Astyanax intermedius in a headwater stream of Atlantic Rainforest Anais da ABC (AABC)
SOUZA,URSULLA P.; FERREIRA,FABIO C.; CARMO,MICHELE A.F.; BRAGA,FRANCISCO M.S..
ABSTRACT In this paper, we determined diet composition, reproductive periodicity and fecundity of Astyanax intermedius in a headwater stream of a State Park of an Atlantic rainforest. We also evaluated the influence of rainfall, water temperature and fish size on niche width and niche overlap. Sampling was conducted monthly throughout one year in the Ribeirão Grande stream, southeastern Brazil. Diet consisted of 31 food items with equal contribution of allochthonous and autochthonous items. Females were larger than males, and the mean sizes at first maturation were 4.44 cm and 3.92 cm, respectively. Based on 212 pairs of mature ovaries, the number of oocytes per female ranged from 538 to 6,727 (mean = 2,688.7). Niche width and niche overlap were not...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Characidae fishes; Niche overlap; Niche width; Spawning type.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502151
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Feeding ecology of carnivores (Mammalia, Carnivora) in Atlantic Forest remnants, Southern Brazil Biota Neotropica
Rocha-Mendes,Fabiana; Mikich,Sandra Bos; Quadros,Juliana; Pedro,Wagner André.
The diet of some sympatric carnivore species in three Atlantic Forest remnants of Southern Brazil was studied in order to assess their food niche. We conducted monthly field trips between February 2003 and January 2004 to collect fecal samples that were subsequently examined together with others collected sporadically between November 1994 and January 2003. Of the 416 samples analysed, 198 had the "author" species identified through microscopic analysis guard hairs, which revealed the presence of 10 carnivores and some information about their diet. Puma yagouaroundi had the largest dietary niche breadth, whereas Leopardus tigrinus and Nasua nasua showed the lowest values. Extensive niche overlap was observed between L. tigrinus and N. nasua, L. tigrinus...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carnivores; Diet; Endangered species; Atlantic Forest; Forest fragments; Neotropics; Niche overlap.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000400001
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Feeding ecology of Ozotoceros bezoarticus: conservation implicationsin Uruguay Iheringia, Sér. Zool.
Cosse,Mariana; González,Susana; Gimenez-Dixon,Mariano.
The pampas deer (Ozotoceros bezoarticus Linnaeus, 1758) was in the recent past one of the most characteristic species in the Uruguayan grasslands. However, today the species is very rare, with small relict populations inhabiting in few ranches. To improve our understanding of pampas deer habitat use in modified ecosystems and propose management guidelines we analyzed the pampas deer feeding ecology at Los Ajos ranch. We performed an annual vegetation survey with the purpose to identify the main components of pampas's deer diet and the spatial overlap with livestock. Vegetation offer was characterized by predominance of monocotyledon plants; in three of the four sample periods. The preference values for the crops were positive for ryegrass in winter (0.24)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diet; Habitat use; Mixed feeders; Niche overlap; Pampas deer.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212009000200007
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Invasive wild boars and native mammals in agroecosystems in the Atlantic Forest of Western Brazil PAB
Doutel-Ribas,Cynthia; Martins,Fernando Ibanez; Campos,Zilca; Piovezan,Ubiratan; Tomas,Walfrido; Silva,Virgínia Santiago; Pellegrin,Aiesca; Mourão,Guilherme.
Abstract: The objective of this work was to estimate an index of the relative biomass per species, in a medium to large-sized mammal community, as well as to determine how the introduced wild boar (Sus scrofa) fits into this index, and to verify if the occupancy of sites by domestic dogs interferes with those of wild boars and how much the periods of dogs’ activity overlap those of wild boars. The biomass/effort index was measured for each native mammal species and for the introduced wild boar, in two surveyed farms in Brazil’s Western Atlantic Forest range, through the use of camera trappings that were also used to verify if dogs and wild boar overlap in space and activity time. Wild boars seem to dominate the community, just a few years after their...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Canis familiaris; Sus scrofa; Activity time; Community composition; Niche overlap.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000104100
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Resource use and coexistence of two syntopic hylid frogs (Anura, Hylidae) Zoologia
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
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