scholarly journals Environmental factors, spatial variation, and specific requirements of Chironomidae in Mediterranean reference streams

2009 ◽  
Vol 28 (1) ◽  
pp. 247-265 ◽  
Author(s):  
Tura Puntí ◽  
Maria Rieradevall ◽  
Narcís Prat
Keyword(s):  
Environmental Factors ◽  
Spatial Variation

Bioeroding sponge assemblages: the importance of substrate availability and sediment

2018 ◽  
Vol 99 (2) ◽  
pp. 343-358 ◽  
Author(s):  
Joseph Marlow ◽  
Christine H.L. Schönberg ◽  
Simon K. Davy ◽  
Abdul Haris ◽  
Jamaluddin Jompa ◽  
...  
Keyword(s):  
Coral Reef ◽  
Environmental Factors ◽  
Spatial Variation ◽  
Environmental Conditions ◽  
Sponge Species ◽  
Coral Mortality ◽  
Substrate Availability ◽  
Abiotic Conditions ◽  
Assemblage Composition ◽  
Reef Health

Despite global deterioration of coral reef health, not all reef-associated organisms are in decline. Bioeroding sponges are thought to be largely resistant to the factors that stress and kill corals, and are increasing in abundance on many reefs. However, there is a paucity of information on how environmental factors influence spatial variation in the distribution of these sponges, and how they might be affected by different stressors. We aimed to identify the factors that explained differences in bioeroding sponge abundance and assemblage composition, and to determine whether bioeroding sponges benefit from the same environmental conditions that can contribute towards coral mortality. Abundance surveys were conducted in the Wakatobi region of Indonesia on reefs characterized by different biotic and abiotic conditions. Bioeroding sponges occupied an average of 8.9% of available dead substrate and variation in abundance and assemblage composition was primarily attributed to differences in the availability of dead substrate. Our results imply that if dead substrate availability increases as a consequence of coral mortality, bioeroding sponge abundance is also likely to increase. However, bioeroding sponge abundance was lowest on a sedimented reef, despite abundant dead substrate. This suggests that not all forms of coral mortality will benefit all bioeroding sponge species, and sediment-degraded reefs are likely to be dominated by a few resilient bioeroding sponge species. Overall, we demonstrate the importance of understanding the drivers of bioeroding sponge abundance and assemblage composition in order to predict possible impacts of different stressors on reefs communities.

scholarly journals PENGGUNAAN SISTEM INFORMASI GEOGRAFIS (SIG) DALAM ANALISIS DAYA DUKUNG DAN DAYA TAMPUNG LINGKUNGAN HIDUP DI KABUPATEN TANAH LAUT

INFO-TEKNIK ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 105
Author(s):  
Muhammad Syahirul Alim
Keyword(s):  
Information System ◽  
Environmental Factors ◽  
Natural Resources ◽  
Spatial Variation ◽  
Geographical Information System ◽  
Carrying Capacity ◽  
Geographical Information ◽  
High Category ◽  
Environmental Carrying Capacity ◽  
Very High

The objective of the study was to provide an overview of the using of Analytical Geographical Information System (GIS) to determine Environmental Carrying Capacity and Capability in Tanah Laut Regency Province of South Kalimantan. The combination methode of Pairwise Comparation and The spatial capacity offered by GIS is directly applicable to understanding the spatial variation by environmental factors. The result of this study shows that carrying capacity and capability can reflect a potential and availability of natural resources in the area of Tanah Laut Regency so that it can be known in which areas have the greatest potential and availability of indicators where the percentage distribution of the extent of the environmental carrying capacity of each ecosistem service potential and the most dominant availability are in the District of Jorong, which is 60% for the High category including 6 Ecosistem Services and 40% for the very high category for 4 Ecosistem Services. 30% Kintap Subdistrict for very high category for 3 Ecosistem Services and 20% for High category includes 2 Ecosistem Services.

scholarly journals Spatial variation in egg size of a top predator: Interplay of body size and environmental factors?

2008 ◽  
Vol 34 (2) ◽  
pp. 186-193 ◽  
Author(s):  
Maite Louzao ◽  
José M. Igual ◽  
Meritxell Genovart ◽  
Manuela G. Forero ◽  
Keith A. Hobson ◽  
...  
Keyword(s):  
Body Size ◽  
Environmental Factors ◽  
Spatial Variation ◽  
Egg Size ◽  
Top Predator

scholarly journals Spatial Variation of Survival for Colorectal Cancer in Malaysia

2021 ◽  
Vol 18 (3) ◽  
pp. 1052
Author(s):  
Anis Kausar Ghazali ◽  
Thomas Keegan ◽  
Benjamin M. Taylor
Keyword(s):  
Colorectal Cancer ◽  
Risk Factors ◽  
Socioeconomic Status ◽  
Environmental Factors ◽  
Spatial Variation ◽  
Survival Data ◽  
Proportional Hazards Model ◽  
Healthcare Provision ◽  
Risk Of Death ◽  
Increased Risk

A patient’s survival may depend on several known and unknown factors and it may also vary spatially across a region. Socioeconomic status, accessibility to healthcare and other environmental factors are likely to contribute to survival rates. The aim of the study was to model the spatial variation in survival for colorectal cancer patients in Malaysia, accounting for individual and socioeconomic risk factors. We conducted a retrospective study of 4412 colorectal cancer (ICD-10, C18-C20) patients diagnosed from 2008 to 2013 to model survival in CRC patients. We used the data recorded in the database of the Malaysian National Cancer Patient Registry-Colorectal Cancer (NCPR-CRC). Spatial location was assigned based on the patients’ central district location, which involves 144 administrative districts of Malaysia. We fitted a parametric proportional hazards model in which the spatially correlated frailties were modelled by a log-Gaussian stochastic process to analyse the spatially referenced survival data, which is also known as a spatial survival model. After controlling for individual and area level characteristics, our findings indicate wide spatial variation in colorectal cancer survival across Malaysia. Better healthcare provision and higher socioeconomic index in the districts where patients live decreased the risk of death from colorectal cancer, but these associations were not statistically significant. Reliable measurement of environmental factors is needed to provide good insight into the effects of potential risk factors for the disease. For example, a better metric is needed to measure socioeconomic status and accessibility to healthcare in the country. The findings provide new information that might be of use to the Ministry of Health in identifying populations with an increased risk of poor survival, and for planning and providing cancer control services.

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