scholarly journals Multivariate statistical approach to the temporal and spatial patterns of selected bioindicators observed in the North Sea during the years 1995?1997

1999 ◽  
Vol 53 (3-4) ◽  
pp. 257-266 ◽  
Author(s):  
S. R. Schmolke ◽  
K. Broeg ◽  
S. Zander ◽  
V. Bissinger ◽  
P. D. Hansen ◽  
...  
Keyword(s):  
Spatial Patterns ◽  
North Sea ◽  
Statistical Approach ◽  
Multivariate Statistical ◽  
Temporal And Spatial Patterns ◽  
The North ◽  
Multivariate Statistical Approach ◽  
The North Sea ◽  
Temporal And Spatial

Simulating the temporal and spatial dynamics of the North Sea using the new model GETM (general estuarine transport model)

2004 ◽  
Vol 54 (2) ◽  
pp. 266-283 ◽  
Author(s):  
Adolf Stips ◽  
Karsten Bolding ◽  
Thomas Pohlmann ◽  
Hans Burchard
Keyword(s):  
North Sea ◽  
Transport Model ◽  
Spatial Dynamics ◽  
New Model ◽  
The North ◽  
The North Sea ◽  
Temporal And Spatial

scholarly journals Satellite observations for describing fire patterns and climate-related fire drivers in the Brazilian savannas

2018 ◽  
Vol 18 (1) ◽  
pp. 125-144 ◽  
Author(s):  
Guilherme Augusto Verola Mataveli ◽  
Maria Elisa Siqueira Silva ◽  
Gabriel Pereira ◽  
Francielle da Silva Cardozo ◽  
Fernando Shinji Kawakubo ◽  
...  
Keyword(s):  
Land Use ◽  
Spatial Analysis ◽  
Spatial Patterns ◽  
Satellite Observations ◽  
Fire Occurrence ◽  
Burned Areas ◽  
Temporal And Spatial Patterns ◽  
The North ◽  
Vegetation Condition ◽  
Temporal And Spatial

Abstract. In the Brazilian savannas (Cerrado biome) fires are natural and a tool for shifting land use; therefore, temporal and spatial patterns result from the interaction of climate, vegetation condition and human activities. Moreover, orbital sensors are the most effective approach to establish patterns in the biome. We aimed to characterize fire, precipitation and vegetation condition regimes and to establish spatial patterns of fire occurrence and their correlation with precipitation and vegetation condition in the Cerrado. The Cerrado was first and second biome for the occurrence of burned areas (BA) and hotspots, respectively. Occurrences are higher during the dry season and in the savanna land use. Hotspots and BA tend to decrease, and concentrate in the north, but more intense hotspots are not necessarily located where concentration is higher. Spatial analysis showed that averaged and summed values can hide patterns, such as for precipitation, which has the lowest average in August, but minimum precipitation in August was found in 7 % of the Cerrado. Usually, there is a 2–3-month lag between minimum precipitation and maximum hotspots and BA, while minimum VCI and maximum hotspots and BA occur in the same month. Hotspots and BA are better correlated with VCI than precipitation, qualifying VCI as an indicator of the susceptibility of vegetation to ignition.

scholarly journals Combination of genetics and spatial modelling highlights the sensitivity of cod (Gadus morhua) population diversity in the North Sea to distributions of fishing

2013 ◽  
Vol 71 (4) ◽  
pp. 794-807 ◽  
Author(s):  
Michael R. Heath ◽  
Mark A. Culling ◽  
Walter W. Crozier ◽  
Clive J. Fox ◽  
William S. C. Gurney ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Spatial Patterns ◽  
North Sea ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Population Diversity ◽  
Trawl Survey ◽  
The North ◽  
Animal Populations ◽  
The North Sea

Abstract Conserving genetic diversity in animal populations is important for sustaining their ability to respond to environmental change. However, the “between-population” component of genetic diversity (biocomplexity) is threatened in many exploited populations, particularly marine fish, where harvest management regions may be larger than the spatial extent of genetically distinct subpopulations. Using single-nucleotide polymorphism data, we delineated the geographic limits of three population units of Atlantic cod (Gadus morhua) in northwest European waters. Two of the populations cohabit the North Sea, and trawl survey data showed differing trends in their abundances. We developed a spatial model of these units to simulate population dynamics under spatial patterns of harvesting. Competition between units during the pelagic juvenile stages in the model led to suppression of the more localized northern North Sea (Viking) unit by the more widespread (Dogger) unit, and its premature extinction under some spatial patterns of fishing. Fishery catch limits for cod are set at the scale of the whole North Sea without regard to such subpopulation dynamics. Our model offers a method to quantify adjustments to regional fishing mortality rates to strike a balance between maximizing sustainable yield and conserving vulnerable populations.

scholarly journals Spatial patterns of infauna, epifauna, and demersal fish communities in the North Sea

2009 ◽  
Vol 67 (2) ◽  
pp. 278-293 ◽  
Author(s):  
Henning Reiss ◽  
Steven Degraer ◽  
Gerard C. A. Duineveld ◽  
Ingrid Kröncke ◽  
John Aldridge ◽  
...  
Keyword(s):  
Spatial Patterns ◽  
North Sea ◽  
Ecosystem Management ◽  
Large Scale ◽  
Fish Communities ◽  
Demersal Fish ◽  
Environmental Drivers ◽  
The North ◽  
Oyster Ground ◽  
The North Sea

Abstract Reiss, H., Degraer, S., Duineveld, G. C. A., Kröncke, I., Aldridge, J., Craeymeersch, J., Eggleton, J. D., Hillewaert, H., Lavaleye, M. S. S., Moll, A., Pohlmann, T., Rachor, E., Robertson, M., vanden Berghe, E., van Hoey, G., and Rees, H. L. 2010. Spatial patterns of infauna, epifauna, and demersal fish communities in the North Sea. – ICES Journal of Marine Science, 67: 278–293. Understanding the structure and interrelationships of North Sea benthic invertebrate and fish communities and their underlying environmental drivers is an important prerequisite for conservation and spatial ecosystem management on scales relevant to ecological processes. Datasets of North Sea infauna, epifauna, and demersal fish (1999–2002) were compiled and analysed to (i) identify and compare spatial patterns in community structure, and (ii) relate these to environmental variables. The multivariate analyses revealed significantly similar large-scale patterns in all three components with major distinctions between a southern community (Oyster Ground and German Bight), an eastern Channel and southern coastal community, and at least one northern community (>50 m deep). In contrast, species diversity patterns differed between the components with a diversity gradient for infauna and epifauna decreasing from north to south, and diversity hotspots of demersal fish, e.g. near the major inflows of Atlantic water. The large-scale hydrodynamic variables were the main drivers for the structuring of communities, whereas sediment characteristics appeared to be less influential, even for the infauna communities. The delineation of ecologically meaningful ecosystem management units in the North Sea might be based on the structure of the main faunal ecosystem components.

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