Phytoplankton distribution along the eastern coast of the USA. I. Phytoplankton composition

1976 ◽  
Vol 38 (1) ◽  
pp. 81-89 ◽  
Author(s):  
H. G. Marshall
Keyword(s):  
Eastern Coast ◽  
Phytoplankton Composition ◽  
Phytoplankton Distribution ◽  
The Usa

scholarly journals Phytoplankton community of a polymictic reservoir, La Plata River basin, Uruguay

1999 ◽  
Vol 59 (4) ◽  
pp. 535-541 ◽  
Author(s):  
M. C. PÉREZ ◽  
S. BONILLA ◽  
G. MARTÍNEZ
Keyword(s):  
Spatial Heterogeneity ◽  
River Basin ◽  
Phytoplankton Community ◽  
Water Reservoir ◽  
Phytoplankton Composition ◽  
Phytoplankton Abundance ◽  
La Plata ◽  
Phytoplankton Distribution ◽  
Aulacoseira Granulata

This paper deals with the analysis of phytoplankton composition and abundance from four sampling stations at the polymictic system, Rincón del Bonete water reservoir in Uruguay. Sampling data were obtained in 4 seasonal periods between February and November 1993. A hundred and twenty-four taxa were identified, where Aulacoseira granulata (Ehrenb.) Simon., A. granulata var. angustissima (Muller) Simon., A. granulata var. angustissima f. spiralis, (Muller) Simon., A. cf. ambigua, (Grun.) Simon., A. cf.. distans (Ehrenb.) Simon., Cryptomonas spp. and Synedra ulna (Nitzsch) Ehrenberg, were always present. Phytoplankton abundance fluctuated between 29 (autumn) and 2129 (summer) ind/ml. The general dominance of Aulacoseira spp. could be related to the polymictic condition of the system. In cold months phytoplankton distribution was homogeneous among sampling stations, while in warm months, spatial heterogeneity was detected, suggesting that sampling stations can behave as independent compartments.

January-thaw singularity and wave climates along the Eastern coast of the USA

Nature ◽  
1976 ◽  
Vol 263 (5577) ◽  
pp. 491-492 ◽  
Author(s):  
BRUCE P. HAYDEN
Keyword(s):  
Eastern Coast ◽  
The Usa

scholarly journals Atypus karschi Dönitz, 1887 (Araneae: Atypidae): an Asian purse-web spider established in Pennsylvania, USA

2021 ◽  
Author(s):  
Milan Řezáč ◽  
Steven Tessler ◽  
Petr Heneberg ◽  
Ivalú Macarena Ávila Herrera ◽  
Nela Gloríková ◽  
...  
Keyword(s):  
Sex Chromosome ◽  
Carabid Beetles ◽  
Eastern Coast ◽  
Physical Parameters ◽  
Web Spider ◽  
Wide Range ◽  
Close Relationship ◽  
Eastern Usa ◽  
The Usa ◽  
Sex Chromosome System

The Mygalomorph spiders of the family Atypidae are among the most archaic spiders. The genus Atypus Latreille, 1804 occurs in Eurasia and northern Africa, with a single enigmatic species, Atypus snetsingeri Sarno, 1973, restricted to a small area in southeastern Pennsylvania in Eastern USA. This study was undertaken to learn more about genetics of that species, its habitat requirements and natural history. A close relationship to European species could be assumed based on A. snetsingeri’s occurrence on the eastern coast of the USA, however molecular markers (CO1 sequences) confirmed that A. snetsingeri is identical with Atypus karschi Dönitz, 1887 native to East Asia; it is an introduced species. The specific epithet snetsingeri is therefore relegated to a junior synonym of A. karschi . The karyotype of A. karschi has 42 chromosomes in females and 41 in males (X0 sex chromosome system). Chromosomes were metacentric except for one pair, which exhibited submetacentric morphology. In Pennsylvania the above-ground webs are usually vertical and attached to the base of bushes, trees, or walls, although some webs are oriented horizontally near the ground. It was found in a variety of habitats from forests to suburban shrubbery, and over a wide range of soil humidity and physical parameters. Prey include millipedes, snails, woodlice, carabid beetles and earthworms. The number of juveniles in excavated female webs ranged from 70 to 201. Atypus karschi is the first known case of an introduced purse-web spider. It is rarely noticed but well-established within its range in southeastern Pennsylvania.

Phytoplankton in Quebec Lakes: Variation with Lake Morphometry, and with Natural and Anthropogenic Acidification

1990 ◽  
Vol 47 (5) ◽  
pp. 1047-1057 ◽  
Author(s):  
Bernadette Pinel-Alloul ◽  
Ginette Méthot ◽  
Ghislain Verrault ◽  
Yvan Vigneault
Keyword(s):  
Environmental Factors ◽  
Newfoundland And Labrador ◽  
Data Matrix ◽  
Lake Morphometry ◽  
Phytoplankton Composition ◽  
Phytoplankton Distribution ◽  
Total Phytoplankton ◽  
Linkage Cluster ◽  
Lake Size ◽  
Flexible Linkage

Phytoplankton of 54 Québec lakes were studied to determine the effects of acidification, physico-chemistry, and lake morphometry on the community composition. The phytoplankton groups data matrix was submitted to a flexible linkage cluster analysis. The resulted six clusters of lakes are distributed along the northeast to southwest geographic axis and are related to an ascending density gradient in total phytoplankton, chlorophytes, cyanophytes, and microflagellates. Factor analysis produced five derived environmental factors (hardness-alkalinity, lake depth and transparency, dystrophy, lake size and salinity-sulphates loading), which explain 73% of the total variance of the abiotic data matrix. Alkalinity–acidity gradient is the most important factor related to phytoplankton groups and species distribution. Most of the cyanophytes taxa and some chlorophytes are positively related to the hardness-alkalinity and the sulphates loading factors. The abundances of pyrrophytes increases in alkaline lakes subjected to great sulphates loading. Lake morphometry and trophy also influence the phytoplankton distribution. Deep and clear lakes in eastern Quebec are dominated by chrysophycean species. Few species are related to the dystrophy factor. Phytoplankton distribution and relationships with environmental factors in Quebec lakes are compared with studies of the phytoplankton composition in Newfoundland and Labrador lakes.

scholarly journals Population structure of the squid Doryteuthis (Loligo) pealeii on the eastern coast of the USA: Reply to Gerlach et al. (2012)

2012 ◽  
Vol 450 ◽  
pp. 285-287 ◽  
Author(s):  
PW Shaw ◽  
L Hendrickson ◽  
NJ McKeown ◽  
T Stonier ◽  
MJ Naud ◽  
...  
Keyword(s):  
Population Structure ◽  
Eastern Coast ◽  
The Usa ◽  
Loligo Pealeii
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