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| Registros recuperados: 42 | |
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| Allen, Dm; Edwards, D; Feller, Rj; Hutchinson, Se; Ogburnmatthews, V. |
| Unusual events and disturbances are important sources of variability in ecological data sets, but methods for their detection and analysis are not readily available. We have adapted widely-used quality control methods to identify and quantify unusual events in ten-year-long data sets from the relatively pristine North Inlet Estuary, South Carolina, USA.-Seasonal patterns and long-term trends were first removed from biweekly zooplankton and nekton abundance and corresponding water temperature and salinity data using nonparametic smoothing algorithms. The Shewhart Control Chart Method, a quantitative technique used for quality control in industrial manufacturing processes, was used to define four types of events according to intensity and duration.... |
| Tipo: Text |
Palavras-chave: Zooplankton; Nekton; Estuary; Long-term; Disturbance. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00093/20389/18056.pdf |
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| Fleischman, Forrest D.; Workshop in Political Theory and Policy Analysis, School of Public and Environmental Affairs, Indiana University; fleischf@indiana.edu; Boenning, Kinga; Institute of Agricultural Development in Central and Eastern Europe (IAMO); k.boenning@googlemail.com; Garcia-Lopez, Gustavo A; Workshop in Political Theory and Policy Analysis, School of Public and Environmental Affairs, Indiana University; ggarcial@indiana.edu; Mincey, Sarah; Center for the Study of Institutions, Population, and Environmental Change, School of Public and Environmental Affairs, Indiana University; skmincey@indiana.edu; Schmitt-Harsh, Mikaela; Center for the Study of Institutions, Population, and Environmental Change, School of Public and Environmental Affairs, Indiana University; Schmittm@indiana.edu; Lopez, Maria Claudia; Facultad de Estudios Ambientales y Rurales, Universidad Javeriana; mclopezperez@gmail.com; Basurto, Xavier; Duke University Marine Laboratory, Nicholas School of the Environment, Duke University; xavier.basurto@duke.edu; Fischer, Burney; Workshop in Political Theory and Policy Analysis, School of Public and Environmental Affairs, Indiana University; bufische@indiana.edu; Ostrom, Elinor; Workshop in Political Theory and Policy Analysis, School of Public and Environmental Affairs, Indiana University; ostrom@indiana.edu. |
| We develop an analytic framework for the analysis of robustness in social-ecological systems (SESs) over time. We argue that social robustness is affected by the disturbances that communities face and the way they respond to them. Using Ostrom's ontological framework for SESs, we classify the major factors influencing the disturbances and responses faced by five Indiana intentional communities over a 15-year time frame. Our empirical results indicate that operational and collective-choice rules, leadership and entrepreneurship, monitoring and sanctioning, economic values, number of users, and norms/social capital are key variables that need to be at the core of future theoretical work on robustness of self-organized systems. |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Disturbance; Intentional communities; Response; Robustness; Social-ecological systems. |
| Ano: 2010 |
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| Niemi, Gerald; University of Minnesota; gniemi@d.umn.edu; Hanowski, JoAnn; University of Minnesota; jhanowsk@sage.nrri.umn.edu; Helle, Pekka; Finnish Game and Fisheries Research Institute; meltausrta@HELSINKI.RKTL.fi; Howe, Robert; University of Wisconsin; hower@uwgb.wi.edu; Venier, Lisa; Canadian Forest Service; lvenier@nrcan.gc.ca; Welsh, Daniel; Canadian Forest Service; dwelsh@AM.NCR.FORESTRY.CA. |
| We review characteristics of birds in boreal forests in the context of their ecological sustainability under both natural and anthropogenic disturbances. We identify the underlying ecological factors associated with boreal bird populations and their variability, review the interactions between boreal bird populations and disturbance, and describe some tools on how boreal bird populations may be conserved in the future. The boreal system has historically been an area with extensive disturbance such as fire, insect outbreaks, and wind. In addition, the boreal system is vulnerable to global climate change as well as increasing pressure on forest and water resources. Current knowledge indicates that birds play an important role in boreal forests, and... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Birds; Boreal; Conservation; Disturbance; Forests; Forestry; Natural resources; Nearctic; Palearctic; Sustainability; Trends.. |
| Ano: 1998 |
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| Silveira,Thiago Cesar Lima; Rodrigues,Gilberto Gonçalves; Souza,Gabriela Peixoto Coelho de; Würdig,Norma Luiza. |
| Wetlands are important because they have high biodiversity and are considered, by environmental agencies, permanently protected areas due to their importance to conservation. In Southern Brazil the aquatic macrophyte Typha domingensis is harvested to be used in the manufacture of handicraft, being an important income source to small farmers. This work aims to test the cut effect of T. domingensis on benthic macroinvertebrates as well as on macrophyte regeneration. These phenomena were analyzed in small areas (1 m²) in a T. domingensis stand by comparing cut treatments and control treatments. Macroinvertebrate were sampled with a corer in the following time sequence after the cut event in both treatments: one day, 26 days, 60 days, 89 days, and 182 days.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Disturbance; Bioindication; Vegetal management; Aquatic macrophytes; Non-wood products. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000300014 |
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| Silveira, Thiago Cesar Lima; UFRGS; Rodrigues, Gilberto Gonçalves; UFBA; Souza, Gabriela Peixoto Coelho de; UFRGS; Würdig, Norma Luiza; UFRGS. |
| Lagoons are considered protected areas because these systems play a key ecological role. However, the extraction of macrophyte Schoenoplectus californicus is held for manufacture of handcrafts, being an alternative income for riverbank communities. This study evaluated the impact of S. californicus experimental cutting on benthic macroinvertebrates trough a field experiment. Macroinvertebrates were sampled at 1, 12, 26 and 60 days after the macrophyte cutting in demarked plots (1 m²), as well at control plots. The families number was not statistically different (ANOVA, p > 0.05), but the total density of invertebrates, and the density of Ceratopogonidae were significant (ANOVA, p < 0.05) for interaction between sampling date and treatment. A... |
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Palavras-chave: 2.00.00.00-6; 2.05.00.00-9; Disturbance; Bioindication; Vegetal management; Schoenoplectus californicus; Aquatic macrophyte; Non-wood products Ecologia Disturbance; Bioindication; Vegetal management; Schoenoplectus californicus; Aquatic macrophyte; Non-wood products. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/6383 |
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| Camus, Patrick; Compere, Chantal; Blanchet, Aline; Dimeet, Joel; Hamon, Dominique; Lacotte, Nicolas; Peleau, Michel; Lassalle, Elisabeth. |
| This study [...] was carried out from June 1998 to January 2000 and enabled the assessment of the scientific knowledge on the biology, ecology and distribution of the Annelida Polychaeta sedentaria: Ficopomatus enigmaticus. [...] In order to better determine the characteristics of this species' environment and development cycle, a study was conducted in the worksite of the marina of Vannes. This study, mostly biological, was completed by a technological study on the fighting techniques (antifouling paints) used against the damage made by this worm on the boat hulls. In addition, this document presents some recommendations to follow in order to limit, or stop, the development of this "pollution". |
| Tipo: Text |
Palavras-chave: Marina harbours; Disturbance; Colonization; Ficopomatus enigmaticus; Port de plaisance; Pertubation; Colonisation; Ficopomatus enigmaticus. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/rapport-6131.pdf |
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| Rocha,Fabíola Carla da; Casatti,Lilian; Carvalho,Fernando Rogério; Silva,Alexandre Marco da. |
| Macrophytes are a major component of lentic and lotic aquatic ecosystems. As consequences of environmental degradation, species of cattail (genus Typha) may become dominant along streams. The purpose of this study was to investigate the structure and feeding of fish assemblages in stream stretches under influence of Typha sp., also addressing the influences of temporal variation on composition, abundance, biomass, diversity, species richness, and feeding of fish. Six streams (labelled S1-S6) in the upper rio Turvo basin, southeast Brazil, with dense stands of Typha sp. in the instream and riparian habitat, were studied in six campaigns during three central months in both of the dry and wet periods, by using a standardized collection effort. Thirty-seven... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Disturbance; Chironomidae larvae; Detritus; Macrophytes; Upper rio Paraná. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200016 |
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| Blanchard, Fabian; Le Loc'H, Francois; Hily, Christian; Boucher, Jean. |
| Within the framework of the 'dynamic equilibrium model', we tested the hypothesis that fishing causes major disturbance to benthic communities on deeper bottoms of the continental shelf. Benthic megafauna on the Bay of Biscay coast of France was sampled on fishing grounds subject to various conditions of exploitation. Samples were taken at around 100 m depth to avoid strong natural disturbances. Species diversity and the largest body mass class of invertebrates were smaller in strongly exploited areas than in moderately exploited ones. Biomass size spectra in strongly exploited areas were characterised by a comparatively large biomass of small invertebrates, hence the K-dominance curve of abundance was either above the biomass curve, or the curves... |
| Tipo: Text |
Palavras-chave: Benthic communities; Community dynamics; Disturbance; Diversity; Size spectrum. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/00000/10896/7578.pdf |
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| Massi,Klécia Gili; Franco,Augusto César. |
| ABSTRACT Cerrado tree species can survive fire by resprouting. Generally, large and less damaged plants produce new branches and leaves from stem buds (aerial), whereas small and highly injured individuals would resprout from the stem base or from underground organs (basal). We compared the three most common Cerrado woody plant species in a savanna area of the IBGE Ecological Reserve, Brasília, Brazil, aiming to verify if the resprouting strategy (aerial or basal) differed between species and if that was related to plant size. Guapira noxia had small-sized plants, a higher percentage of trunk charred and more individuals with basal resprouting, while Eriotheca pubescens had large-sized plants with a greater intensity of aerial resprouting, Basal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cerrado; Disturbance; Fire; Resprout; Size; Tree. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000400693 |
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| Chaneton,Enrique J; Mazía,Noemí; Garibaldi,Lucas A; Chaij,Jaquelina; Kitzberger,Thomas. |
| Volcanism has been a major force shaping the dynamics of Andean landscapes during the Holocene. Yet we still know little about the consequences of modern volcanic events on forest functioning. Ash fall may elicit multiple direct and indirect effects on key ecosystem attributes, with disturbance severity likely varying with distance to the crater. We examined the impact of ash deposition on foliage productivity and insect herbivory after the 2011 eruption of the Volcán Puyehue-Cordón Caulle system, in Nothofagus pumilio forests of northern Patagonia, Argentina. Tree leaf litterfall, a surrogate for annual foliar production, was measured before and after the event in wet and dry forest sites, which were located 22 km and 80 km east from the crater and were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Canopy insects; Disturbance; Herbivory; Long-term study; Nothofagus pumilio; Productivity; Volcanism. |
| Ano: 2014 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2014000100007 |
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| Sánchez-Botero,Jorge Iván; Sequeira Garcez,Danielle; Pellegrini Caramaschi,Erica; Miguel Saad,Adriana. |
| The effects of a disturbance by sandbank opening on the fish fauna community were evaluated through a long-term study in the Imboassica coastal lagoon, Rio de Janeiro State, Brazil. The fish and salinity samples were conducted between 1993 and 2004, with the goal of characterizing the structure and effects of four sandbank openings on this community, such as resilience and resistance measurements. During three sandbank openings, between the years of 1993 and 1996, the resilience time of the fish community could not be identified due to the short time period between openings, their magnitude and the discontinuity of the fish sampling. Monitoring studies previously conducted between 1993 and 2004, indicated that factors structuring the fish fauna of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Disturbance; Fish community; Coastal lagoon; Brazil. |
| Ano: 2009 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612009000100010 |
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| Lima,Tatiane N.. |
| ABSTRACT Antlion larvae of Myrmeleon brasiliensis (Návas, 1914) build their traps in a microenvironment with protection from the direct action of rain and other perturbations as well as microhabitats that are less protected from disturbances that can destroy the traps. Differences in microhabitats may affect the characteristics of the trap-building process due the high energy expenditure exerted in building and maintaining these traps, which led to the following question: Do antlion larvae of M. brasiliensis build larger traps in protected microhabitats? Considering the occurrence of M. brasiliensis larvae in two microhabitats and the measurements of the size of the larvae and their traps, the hypothesis was that larvae would occur in greater abundance and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antlion; Disturbance; Foraging; Traps. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212020000100215 |
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| Mesa,Leticia Mariana. |
| The aim of this study was to assess the interannual and seasonal changes in the community composition, abundance and presence-absence of macroinvertebrates in the streams of the northwestern of Argentina. The importance of environmental variability in determining these changes was also analyzed. Macroinvertebrates were collected in eleven streams during high (March) and low (September) water periods during two years. Physical variables and water parameters were also recorded at each site. Community composition and abundance differed significantly between seasons, but the presence-absence data did not exhibit a clear pattern of seasonal change. Rapid recolonization of disturbed substrate could ensure the recuperation of benthic community. Small body sizes,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Andean streams; Disturbance; Northwestern Argentina; Seasonal spates. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000300011 |
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| Registros recuperados: 42 | |
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