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| Registros recuperados: 13 | |
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| Lagarde, Franck; Fiandrino, Annie; Ubertini, Martin; Roque D'Orbcastel, Emmanuelle; Mortreux, Serge; Chiantella, Claude; Bec, Beatrice; Bonnet, Delphine; Roques, Cécile; Bernard, Ismael; Richard, Marion; Guyondet, Thomas; Pouvreau, Stephane; Lett, Christophe. |
| The recent discovery of Pacific oyster Crassostrea gigas (also known as Magallana gigas) spatfields in a Mediterranean lagoon intensely exploited for shellfish farming (Thau lagoon) revealed significant contrasts in spatial patterns of recruitment. We evaluated the processes that drive spatial patterns in oyster recruitment by comparing observed recruitment, simulated hydrodynamic connectivity and ecological variables. We hypothesized that spatial variability of recruitment depends on (1) hydrodynamic connectivity and (2) the ecology of the larval supply, settlement, metamorphosis, survival and biotic environmental parameters. We assessed recruitment at 6-8 experimental sites by larval sampling and spat collection inside and outside oyster farming areas... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Coastal lagoon; Larval ecology; Spatial patterns; Connectivity; Settlement; Recruitment; Oligotrophication. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00598/70981/69271.pdf |
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| Vaz, Sandrine; Carpentier, Andre; Coppin, Franck. |
| Multivariate and spatial analyses are used to identify and locate fish, cephalopod, and macrocrustacean species assemblages in the eastern English Channel from 1988 to 2004. Four sub-communities with varying diversity levels were identified in relation to depth, salinity, temperature, seabed shear stress, sediment type, and benthic community nature. From 1997 to 2004, some 25% of overall community structure variance could be related to the available environmental descriptors and 20% to persistent factors such as depth, seabed shear stress, sediment, and macro-invertebrate community type. Although there may be significant interannual shifts in overall community structure and composition, the sub-communities identified persisted over time, reflecting the... |
| Tipo: Text |
Palavras-chave: Structuring environment; Spatial patterns; Fish community; Eastern English Channel; Diversity. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2829.pdf |
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| Silva,Marcelo H. L.; Torres Júnior,Audálio R.; Castro,Antonio C. L.; Azevedo,James W. J.; Ferreira,Cássia F. C.; Cardoso,Rayssa L.; Nunes,Jorge L. S.; Carvalho-Neta,Raimunda N. F.. |
| ABSTRACT: The fish assemblage structure in a port area in São Marcos Bay (Amazonic coast) was evaluated based on the spatial and temporal distributions to identify potential changes in response to anthropic pressure increases associated with industrial and port activities in region. The samples were taken between March 2011 and November 2015. The ichthyofauna was represented by a total of 56 species, distributed in 15 orders and 29 families. Captures were dominated by Genyatremus luteus (Bloch, 1790), but Sciades proops (Valenciennes, 1840) was the most representative in terms of biomass. Seasonal distributions of fish assemblage did not reveal significant differences. However, there was a difference between catch sites, abundance, biomass and Shannon... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ichthyofauna; Estuary; Seasonal variability; Spatial patterns; Maranhão Amazon. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212018000100218 |
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| Oliveira,Ronnie E. M. C. C.; Pessanha,André L. M.. |
| A comparative study involving three mesotidal beaches from reflective to estuarine states was conducted between October 2010 and September 2011 in the estuary of Mamanguape River, northeastern Brazil. The aim was to test for differences in fish assemblages along a morphodynamic continuum, particularly the effects of wave action. In total, 3,732 fish from 71 species were examined; Rhinosardinia bahiensisand Atherinella brasiliensisdominated the estuarine beach, whereas Trachinotus carolinus dominated the reflective beach. Fish assemblages were structured by spatial differences among the sites, and overall abundance, richness and biomass demonstrated a clear increasing trend from the reflective to the estuarine beaches, indicating a primary influence of wave... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Community descriptors; Juveniles; Nursery; Spatial patterns; Wave action. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000100165 |
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| Bellier, Edwige; Planque, Benjamin; Petitgas, Pierre. |
| The spatial extent of small pelagic fish spawning habitat is influenced by environmental factors and by the state of the adult population. In return, the configuration of spawning habitat affects recruitment and therefore the future structure of the adult population. Interannual changes in spatial patterns of spawning reflect variations in adult population structures and their environment. The present study describes the historical changes in the spatial distribution of spawning of anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) in the Bay of Biscay during two periods: 1967-72 and 2000-2004. Using data from egg surveys conducted in spring, the spatial distributions of anchovy and sardine eggs are characterized by means of geostatistics.... |
| Tipo: Text |
Palavras-chave: Spawning habitat; Spatial patterns; Sardine; Long term changes; Bay of Biscay; Anchovy. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2179.pdf |
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| Zucaratto,Rodrigo; Pires,Alexandra dos Santos. |
| Spatial pattern of the palm Astrocaryum aculeatissimum was investigated in an urban Atlantic Forest fragment (Tijuca National Park, Brazil) where its main seed disperser, the red-rumped agouti Dasyprocta leporina, is locally extinct. A 120 × 130 m plot (1.56 ha) was established in which all A. aculeatissimum individuals were quantified, georeferenced, and classified by ontogenetic stages, namely, seedling, infant, juvenile, immature individual, and adult. Analyses were performed using Ripley's K function. We recorded 376 individuals, most of which were in the juvenile stage (n = 228). The spatial pattern was aggregated as observed for other palm species. Seedlings and infants were not associated with adults, whereas juveniles and immature individuals were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantic Forest; Palm; Recruitment distances; Ripley's K function; Spatial patterns. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000200244 |
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| Woillez, Mathieu; Rivoirard, Jacques; Petitgas, Pierre. |
| This paper presents the spatial indicators used in the European project FISBOAT. These are statistics intended to capture spatial patterns of fish populations, using fish density data collected during scientific surveys. To handle diffuse population limits, indicators are designed not to depend on arbitrary delineation of the domain. They characterize the location (centre of gravity and spatial patches), occupation of space (inertia, isotropy, positive area, spreading area and equivalent area) and microstructure. Collocation between different populations is summarized by a global index of collocation. These spatial indicators have the potential to be used in a monitoring system to detect changes in spatial distribution. They could be helpful for relating... |
| Tipo: Text |
Palavras-chave: Fish populations; Spatial patterns; Monitoring; Spatial indicators. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6687.pdf |
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| Trenkel, Verena; Beecham, Jonathan A.; Blanchard, Julia L.; Edwards, Charles T. T.; Lorance, Pascal. |
| The status of an exploited population is ideally determined by monitoring changes in abundance and distributional range and pattern over time. Area of occupancy is a measure of the current distribution. Unfortunately, for many populations, scientific abundance and distribution information is not readily available. To evaluate the reliability of commercial fishing data for deriving occupancy indicators that could serve as proxies for stock abundance, we investigated four questions: 1) Occupancy changes with stock biomass, but is this change strong enough to make occupancy a sensitive indicator of population biomass? 2) Fishing boats follow fish, but when does such activity alter the positive macroecological relationship between occupancy and abundance? 3)... |
| Tipo: Text |
Palavras-chave: Catch per unit effort; Spatial patterns; Macroecology; Fisheries management; Marine Strategy Framework Directive; MSFD. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00176/28759/27232.pdf |
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| Lopes,Celio M.; Misaki,Flora; Santos,Karina; Evangelista,Carlos A. P.; Carrijo,Tatiana T.; Garbin,Mário L.. |
| ABSTRACT The interplay between plant-plant interactions and light heterogeneity in the understory of tropical forests has rarely been examined. We aimed to identify the relative importance of the understory light environment and terrestrial bromeliads in explaining the abundance and spatial organization of different plant life forms along a coastal forest gradient from seashore inland in southeastern Brazil. We estimated the abundance of various life forms (herbs, woody plants, bromeliads, climbers, and palms) and the degree of light availability using hemispherical photographs in 165 plots (1 m2) within a 1.75 ha site. We used ordination methods, partial redundancy analysis (pRDA), spatial filtering using Moran’s eigenvector mapping, and Moran’s I... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Community assembly; Hemispherical photographs; Herb layer; Shrub layer; Spatial patterns. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000100084 |
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| Bailey, Sarah A.; Brown, Lyndsay; Campbell, Marnie L.; Canning‐clode, João; Carlton, James T.; Castro, Nuno; Chainho, Paula; Chan, Farrah T.; Creed, Joel C.; Curd, Amelia; Darling, John; Fofonoff, Paul; Galil, Bella S.; Hewitt, Chad L.; Inglis, Graeme J.; Keith, Inti; Mandrak, Nicholas E.; Marchini, Agnese; Mckenzie, Cynthia H.; Occhipinti‐ambrogi, Anna; Ojaveer, Henn; Pires‐teixeira, Larissa M.; Robinson, Tamara B.; Ruiz, Gregory M.; Seaward, Kimberley; Schwindt, Evangelina; Son, Mikhail O.; Therriault, Thomas W.; Zhan, Aibin; Hussey, Nigel. |
| Aim The introduction of aquatic non‐indigenous species (ANS) has become a major driver for global changes in species biogeography. We examined spatial patterns and temporal trends of ANS detections since 1965 to inform conservation policy and management. Location Global. Methods We assembled an extensive dataset of first records of detection of ANS (1965–2015) across 49 aquatic ecosystems, including the (a) year of first collection, (b) population status and (c) potential pathway(s) of introduction. Data were analysed at global and regional levels to assess patterns of detection rate, richness and transport pathways. Results An annual mean of 43 (±16 SD) primary detections of ANS occurred—one new detection every 8.4 days for 50 years. The global rate of... |
| Tipo: Text |
Palavras-chave: Aquatic non-indigenous species; Biological invasions; Detection rate; Inventory; Long-term dataset; Population status; Richness; Spatial patterns; Temporal trends; Transport pathways. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00653/76496/77661.pdf |
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| Registros recuperados: 13 | |
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