The Annual Reproductive Patterns of Bathyporeia Pilosa and Bathyporeia Pelagica [Crustacea: Amphipoda]

1970 ◽  
Vol 50 (2) ◽  
pp. 475-488 ◽  
Author(s):  
J. D. Fish ◽  
G. S. Preece
Keyword(s):  
Vertical Distribution ◽  
West Coast ◽  
Sandy Beach ◽  
Present Report ◽  
Sandy Beaches ◽  
Annual Reproductive Cycle ◽  
The West ◽  
Reproductive Patterns ◽  
Reproductive Cycles ◽  
The Vertical Distribution

The genus Bathyporeia has featured in many reports on the ecology of sandy beaches, yet little is known of the annual reproductive cycles of the species in British waters. Watkin (1938,1939a, b, 1941, 1942) has studied the taxonomy and aspects of the ecology of the genus, and more recently Salvat (1967) has described the annual reproductive cycle of B. pilosa Lindstrom, B. pelagica (Bate), B. sarsi Watkin and B. guilliamsonia (Bate) on the west coast of France. The present report is the result of an investigation into the vertical distribution and annual reproductive patterns of B. pilosa and B. pelagica on a sandy beach at Ynyslas, Cardiganshire. Whilst enabling comparisons to be made with Salvat's data, this study also forms the basis for an investigation into the ecophysiological complex of B. pilosa and B. pelagica.

Submersible observations on the daytime vertical distribution of Aequorea ?forskalea off the west coast of southern Africa

2005 ◽  
Vol 85 (3) ◽  
pp. 519-522 ◽  
Author(s):  
Conrad Sparks ◽  
Andrew S. Brierley ◽  
Emmanuelle Buecher ◽  
Dave Boyer ◽  
Bjøern Axelsen ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Southern Africa ◽  
West Coast ◽  
Sea Surface ◽  
The West ◽  
Spatial Overlap ◽  
The Mean ◽  
The Vertical Distribution

The vertical distribution of the hydromedusa Aequorea ?forskalea was investigated using observations from the research submersible ‘Jago’ collected during 36 dives off the west coast of southern Africa during November 1997 and April 1999. The mean population depth of Aequorea ?forskalea deepened with increasing sea surface temperature. We suggest that this behaviour enables individuals to avoid offshore advection, to minimize spatial overlap with other large medusae and to maintain their position over the middle of the shelf.

scholarly journals The vertical distribution of biomass burning pollution over tropical South America from aircraft in situ measurements during SAMBBA

2019 ◽  
Vol 19 (9) ◽  
pp. 5771-5790 ◽  
Author(s):  
Eoghan Darbyshire ◽  
William T. Morgan ◽  
James D. Allan ◽  
Dantong Liu ◽  
Michael J. Flynn ◽  
...  
Keyword(s):  
Air Quality ◽  
South America ◽  
Vertical Distribution ◽  
Biomass Burning ◽  
Mixing Layer ◽  
Free Troposphere ◽  
The West ◽  
The Vertical Distribution ◽  
Tropical South America

Abstract. We examine processes driving the vertical distribution of biomass burning pollution following an integrated analysis of over 200 pollutant and meteorological profiles measured in situ during the South AMerican Biomass Burning Analysis (SAMBBA) field experiment. This study will aid future work examining the impact of biomass burning on weather, climate and air quality. During the dry season there were significant contrasts in the composition and vertical distribution of haze between western and eastern regions of tropical South America. Owing to an active or residual convective mixing layer, the aerosol abundance was similar from the surface to ∼1.5 km in the west and ∼3 km in the east. Black carbon mass loadings were double as much in the east (1.7 µg m−3) than the west (0.85 µg m−3), but aerosol scattering coefficients at 550 nm were similar (∼120 Mm−1), as too were CO near-surface concentrations (310–340 ppb). We attribute these contrasts to the more flaming combustion of Cerrado fires in the east and more smouldering combustion of deforestation and pasture fires in the west. Horizontal wind shear was important in inhibiting mixed layer growth and plume rise, in addition to advecting pollutants from the Cerrado regions into the remote tropical forest of central Amazonia. Thin layers above the mixing layer indicate the roles of both plume injection and shallow moist convection in delivering pollution to the lower free troposphere. However, detrainment of large smoke plumes into the upper free troposphere was very infrequently observed. Our results reiterate that thermodynamics control the pollutant vertical distribution and thus point to the need for correct model representation so that the spatial distribution and vertical structure of biomass burning smoke is captured. We observed an increase of aerosol abundance relative to CO with altitude both in the background haze and plume enhancement ratios. It is unlikely associated with thermodynamic partitioning, aerosol deposition or local non-fire sources. We speculate it may be linked to long-range transport from West Africa or fire combustion efficiency coupled to plume injection height. Further enquiry is required to explain the phenomenon and explore impacts on regional climate and air quality.

scholarly journals On the fossil flora of the forest of Dean coalfield (Gloucestershire), and the relationships of the coalfields of the west of England and South Wales

1912 ◽  
Vol 84 (575) ◽  
pp. 543-545 ◽  
Keyword(s):  
Vertical Distribution ◽  
Royal Society ◽  
Rare Plants ◽  
Fossil Flora ◽  
The West ◽  
South Wales ◽  
Government Grant ◽  
The Vertical Distribution

Very little has been previously recorded of the flora of the Forest of Dean coalfield, and in the present paper the results of a thorough examination of the flora, and of the vertical distribution of the plants in the three divisions of the productive measures of this coalfield, are discussed. In all 44 species are described, none of which, however, are new to Britain, though some are rare plants elsewhere. The list of species, which have been collected chiefly by the aid of grants from the Royal Society Government Grant Committee, is as follows :— Equisetales— Calamites varians Sternb.; C. ramosus Artis.; C. suckowi Brongn.; C. undulatus ? Sternb. Calamocladus equisetiformis (Schloth.). Annularia radiata ? (Brongn.); A. stellata (Schloth.); A. galioides (L. and H.); A. sphenophylloides (Zenker). Calamostachys tuberculata (Sternb.). Macrostachya infundibuliformis (Brongn.).

A taxonomic revision of Pseudochitinopoma Zibrowius, 1969 (Annelida, Serpulidae) with description of two new species

Zootaxa ◽  
2012 ◽  
Vol 3507 (1) ◽  
pp. 57
Author(s):  
ELENA K. KUPRIYANOVA ◽  
HARRY A. TEN HOVE ◽  
EJIROH NISHI
Keyword(s):  
New Species ◽  
North America ◽  
Red Sea ◽  
Western Australia ◽  
West Coast ◽  
Taxonomic Revision ◽  
The West ◽  
Reproductive Patterns ◽  
Two New Species ◽  
Phylogenetic Affinities

This study is a revision of the poorly known genus Pseudochitinopoma Zibrowius, 1969 (Annelida, Serpulidae), erected for Hyalopomatopsis occidentalis Bush, 1905 from the West Coast of North America. Subsequently, an unnamed Pseudochitinopoma sp. nov. from the Seychelles (ten Hove 1994) (described herein as P. amirantensis sp. nov.) and P. pavimentata Nishi, 1999 were added to the genus. Ficopomatus capensis Day, 1961 is herein referred to Pseudochitinopoma, based on examination of the type material. Finally, Pseudochitinopoma beneliahuae sp. nov. was described from Western Australia and the Red Sea. Reproductive patterns and phylogenetic affinities of Pseudochitinopoma spp. are discussed.

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