Gaussian Analysis: Identifying Environmental Factors Influencing Bell-Shaped Species Distributions

Ecology ◽  
1980 ◽  
Vol 61 (4) ◽  
pp. 733-739 ◽  
Author(s):  
Walter E. Westman
Keyword(s):  
Environmental Factors ◽  
Species Distributions ◽  
Factors Influencing ◽  
Gaussian Analysis

Factors Influencing the Distribution of Phytoplankton in 97 Headwater Lakes in Insular Newfoundland

1987 ◽  
Vol 44 (3) ◽  
pp. 639-649 ◽  
Author(s):  
J. C. Earle ◽  
H. C. Duthie ◽  
David A. Scruton
Keyword(s):  
Environmental Factors ◽  
Species Distributions ◽  
Factors Influencing ◽  
Headwater Lakes ◽  
Species Abundances ◽  
Selected Subset ◽  
Highly Correlated ◽  
Linkage Cluster ◽  
Complete Linkage Cluster ◽  
Lake Size

Phytoplankton samples collected from 97 headwater lakes throughout insular Newfoundland were analyzed and used as a basis for a statistical evaluation of the environmental factors influencing species distributions. A selected subset of 77 taxa were clustered using a complete-linkage cluster analysis. The final 12 clusters represent the associations of species found occurring together in insular Newfoundland. Physical, chemical, and morphometric data collected with the phytoplankton served to characterize the environment. Factor analysis simplified the original variables, many of which were highly correlated and uninterpretable, into seven derived environmental factors: dystrophy, hardness, salinity, lake size, season, watershed influence, and orthophosphate enrichment. The resulting orthogonally rotated (VARIMAX) scores comprising these seven factors were correlated with species abundances. Spearman correlations showed several relationships between species distributions and the seven derived environmental factors. Although the analysis identified a subset of naturally acidic, dystrophic lakes, it failed to reveal any evidence of anthropogenic acidification in the lakes studied. For the most part, the members from each of the cluster groups demonstrated similar relationships with the derived environmental factors. The evidence suggests that the cluster groups may represent species associations; groups of species that co-occur because of their common requirements for specific environmental conditions. Phytoplankton autecological findings resulting from this study of insular Newfoundland lakes correspond well with conclusions derived independently from a comparable study of 95 headwater lakes in Labrador.

scholarly journals Physical, motivational and environmental factors influencing physical activity promotion during hospitalization: older patients’ perspective

2021 ◽  
Author(s):  
Kira Scheerman ◽  
Amber Hendrica Cornelia Schoenmakers ◽  
Carel Gerardus Maria Meskers ◽  
Andrea Britta Maier
Keyword(s):  
Physical Activity ◽  
Environmental Factors ◽  
Older Patients ◽  
Physical Activity Promotion ◽  
Factors Influencing ◽  
Activity Promotion ◽  
Patients Perspective

scholarly journals Environmental factors influencing the number of mosquitoes captured by C0_2 traps at residential areas in Tokyo and neighboring cities, Japan

2005 ◽  
Vol 56 (Supplement) ◽  
pp. 48
Author(s):  
N Nihei ◽  
T Tsuda ◽  
H Kurahashi ◽  
Y Higa ◽  
O Komagata ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Residential Areas ◽  
Factors Influencing

scholarly journals Evaluating socio‐economic and environmental factors influencing farm‐level water scarcity in Punjab, Pakistan

2020 ◽  
Author(s):  
Muhammad Awais Ali Khan ◽  
Khalid Mahmood Ch. ◽  
Ijaz Ashraf ◽  
Muhammad Tahir Siddiqui ◽  
Jerry W. Knox
Keyword(s):  
Environmental Factors ◽  
Water Scarcity ◽  
Farm Level ◽  
Factors Influencing

Hydrology and local environmental factors influencing zooplankton communities in floodplain ponds

Wetlands ◽  
2007 ◽  
Vol 27 (4) ◽  
pp. 864-872 ◽  
Author(s):  
Kim A. Medley ◽  
John E. Havel
Keyword(s):  
Environmental Factors ◽  
Factors Influencing ◽  
Zooplankton Communities

Physiologic and environmental factors influencing the calcium-to-tissue ratio in populations of three species of freshwater pulmonate snails

Oecologia ◽  
1977 ◽  
Vol 29 (3) ◽  
pp. 205-218 ◽  
Author(s):  
R. Douglas Hunter ◽  
Wendy W. Lull
Keyword(s):  
Environmental Factors ◽  
Factors Influencing
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