scholarly journals A PRELIMINARY NOTE ON THE INTERNAL PARASITES OF PUERTO RICAN CATTLE WITH SPECIAL REFERENCE TO THOSE SPECIES FOUND IN CALVES SUFFERING FROM "TROPICAL DIARRHEA"

1969 ◽  
Vol 24 (4) ◽  
pp. 121-132
Author(s):  
John S. Andrews ◽  
José F. Maldonado
Keyword(s):  
Puerto Rican ◽  
Intestinal Parasites ◽  
Common Species ◽  
Preliminary Note ◽  
Preliminary Step ◽  
The North ◽  
Large Numbers ◽  
Verminous Pneumonia ◽  
Internal Parasites ◽  
North And South

The results of a survey of the internal parasites of Puerto Rican cattle made as a preliminary step in connection with investigations on "tropical diarrhea" in calves have shown that the four most common species of gastro-intestinal parasites in the 22 calves autopsied were, B. phlebotomum (77.3%), O. radiatum (63.6%), C. punctata (54.5%), and H. contortus (50%). Eight of the 22 calves and one calf not autopsied were found to be suffering from "tropical diarrhea." These nine calves were from 2 to 11 months old and were about evenly divided between the central mountainous section and the north and south coastal plains. Eight of the nine cases occurred during the first 3 months of the calendar year. One occurred in June. E. zurni, together with the four species of nematodes just mentioned were recovered in large numbers from calves suffering from "tropical diarrhea.". The nematode, S. papillosus, was also implicated in one case as the result of finding large numbers of eggs in the feces of a calf. The remainder of the 21 species of parasites listed, with the exception of the lung worm, D. viviparus, which was found to be the cause of verminous pneumonia in 3 calves, were considered to be of little pathogenic importance in the calves examined.

Is the north side of the Strait of Gibraltar more diverse than the south side? A case study using the intertidal peracarids (Crustacea: Malacostraca) associated to the seaweed Corallina elongata

2009 ◽  
Vol 89 (2) ◽  
pp. 387-397 ◽  
Author(s):  
José M. Guerra-García ◽  
Pilar Cabezas ◽  
Elena Baeza-Rojano ◽  
Free Espinosa ◽  
J. Carlos García-Gómez
Keyword(s):  
Diversity Index ◽  
Common Species ◽  
Rocky Shores ◽  
Mediterranean Species ◽  
Strait Of Gibraltar ◽  
Human Pressure ◽  
The North ◽  
North Side ◽  
North And South

The objectives of this study were to describe the peracaridean fauna associated to the algae Corallina elongata from the Strait of Gibraltar, and explore possible biodiversity and biogeographical patterns of variation along the north–south and Atlantic–Mediterranean axes across the Strait of Gibraltar. Twenty-five stations were selected along the north and south coasts of the Strait to cover the broadest possible range of human pressure and environmental conditions, including both natural rocky shores and artificial breakwaters. The alga Corallina elongata was selected as substrate, and the peracaridean crustaceans were identified to species level and classified in geographical distribution groups. Univariate and multivariate analyses were conducted to explore and confirm patterns of variation. Forty peracarid species were collected, most of them with an Atlantic–Mediterranean distribution (67%) with only the gammarid Parhyale eburnea, being an endemic Mediterranean species. The most common species collected during the present study were the gammarids Hyale stebbingi, Jassa marmorata, Stenothoe monoculoides and Ampithoe spp., the caprellids Caprella grandimana and C. penantis, the isopod Ischyromene lacazei and the tanaid Tanais dulongi. The number of species per station and the diversity index were significantly higher in the stations located along the north side of the Strait of Gibraltar. However, the two-way ANOVA discarded differences between north and south due to the type of substrate (natural versus artificial) and degree of human pressure. Based on peracaridean assemblages, the Strait of Gibraltar behaves as a whole and homogeneous region, with a very similar faunal composition in all stations and there is not a clear gradient of species substitution from the Mediterranean to the Atlantic stations. Provided that we selected the same substrate in all stations, and that statistical analyses revealed that differences between north and south stations were not due to environmental factors such as anthropogenic stress or type of substrate, we should look to historical biogeographical reasons to explain the higher diversity in the north side of the Strait of Gibraltar.

scholarly journals VII.—Preliminary Note on the Volcanic and Associated Rocks of the Neighbourhood of Nuneaton

1886 ◽  
Vol 3 (7) ◽  
pp. 322-325 ◽  
Author(s):  
H. Waller
Keyword(s):  
Microscopical Examination ◽  
Preliminary Note ◽  
The North ◽  
North And South

The relations of the various rocks of the district lying to the North and South of Nuneaton have already been discussed by Prof. Lapworth from the data afforded by investigation in the field. He put into my hands many specimens of the different rocks for the purpose of microscopical examination. I have also received specimens from Mr. W. J. Harrison, and have collected some myself. Mr. J. J. H. Teall has also placed at my disposal a number of slides which he has had prepared from material of his own collecting.

Spatial patterns and seasonality in the epibenthic communities of the Westerschelde (Southern Bight of the North Sea)

2000 ◽  
Vol 80 (1) ◽  
pp. 27-36 ◽  
Author(s):  
K. Hostens
Keyword(s):  
Longitudinal Axis ◽  
Common Species ◽  
Freshwater Species ◽  
Low Oxygen ◽  
Southern Bight ◽  
The North ◽  
Westerschelde Estuary ◽  
Large Numbers ◽  
Mesohaline Zone ◽  
Short Time

Beamtrawl samples were taken monthly between January 1988 and December 1989 in 14 subtidal stations along the longitudinal axis of the Westerschelde Estuary. The estuary harboured high densities of epibenthic species (total average of 2250 ind 1000 m−2). Only 37 fish species were recorded and three mobile macroinvertebrate species were quantified. Seventeen epibenthic species were common, only eight of which were very abundant. An overall dominance of the brown shrimp Crangon crangon was noted. The near absence of anadromous and freshwater species was correlated with the low oxygen concentrations upstream the Dutch–Belgian border. The epibenthic species could be divided into a polyhaline and a mesohaline community along the main salinity–oxygen–turbidity gradients of the estuary. The mesohaline zone was characterized by higher densities and biomasses for shrimps, gobies and flatfish. The spatial structure in the epibenthic community of the polyhaline zone was more influenced by the watermasses from the sea and inflowing channels, and was correlated with the degree of exposure (current velocities and tides). A classification is proposed, based on the season in which the epibenthic species occur in the estuary, and on their life stages and abundances during that period. The monthly data demonstrate that while the eight abundant epibenthic species were generally present throughout the year (summer or winter resident), the majority tended to appear in the Westerschelde at varying times (summer, winter or bimodal) and often remained in large numbers (nine common species) for only a short time. The fact that mainly juveniles were recorded in the higher density-classes, suggests that the Westerschelde Estuary still acts as a nursery area for many epibenthic species.

The Effect of Environmental Factors on the Distribution of the Amphipod Pectenogammarus Planicrurus, with Particular Reference to Grain Size

1970 ◽  
Vol 50 (3) ◽  
pp. 769-785 ◽  
Author(s):  
Edward Morgan
Keyword(s):  
High Water ◽  
Type Locality ◽  
General Idea ◽  
Isle Of Man ◽  
The North ◽  
North Side ◽  
Vertical Range ◽  
Large Numbers ◽  
North And South ◽  
British Coast

The distribution of Pectenogammarus planicrurus Reid around the British coast appears to be restricted to a few scattered areas. As far as is known it has only been recorded in three localities.The first of those is the ‘type locality’, described by Reid (1940), at Saltdean, Sussex. Here the upper region of the shore consists mainly of flint pebbles, the middle shore mainly of sand with patches of flint and chalk pebbles and the lower shore of boulders of chalk on a solid chalk base. Reid found it plentiful under stones near high water mark.In a brief survey of the south coast beaches, from Brighton, Sussex, to Deal, Kent, in the summer of 1965, P. planicrurus was found in large numbers on the chalk and flint beaches associated with the coastal outcropping of the chalks of the North and South Downs. By far the largest populations were found at Seaford, Sussex, where, unlike Saltdean, the pebbles and gravel extend down to low water and P. planicrurus was not restricted to the upper part of the beach as it was at Saltdean. It appears that the ‘type locality’ described by Reid (1940) does not give a true picture of the vertical range of distribution of the species.The second locality is at Port Erin, Isle of Man, where Jones (1948) observed P. planicrurus ‘under stones’ between H.W.N. and L.W.N. at Spaldrick on the north side of Port Erin Bay. Jones did not find this species in sufficient numbers to formulate a general idea of its habitat.

Preliminary results of the study on the reasons of the Hai Hau erosion phenomenon

2007 ◽  
Vol 29 (3) ◽  
pp. 415-426
Author(s):  
Pham Van Ninh ◽  
Phan Ngoc Vinh ◽  
Nguyen Manh Hung ◽  
Dinh Van Manh
Keyword(s):  
Mathematical Modeling ◽  
Historical Data ◽  
Middle Part ◽  
Red River ◽  
Erosion Process ◽  
Red River Delta ◽  
The North ◽  
Severe Erosion ◽  
North And South ◽  
Very High

Overall the evolution process of the Red River Delta based on the maps and historical data resulted in a fact that before the 20th century all the Nam Dinh coastline was attributed to accumulation. Then started the erosion process at Xuan Thuydistrict and from the period of 1935 - 1965 the most severe erosion was contributed in the stretch from Ha Lan to Hai Trieu, 1965 - 1990 in Hai Chinh - Hai Hoa, 1990 - 2005 in the middle part of Hai Chinh - Hai Thinh (Hai Hau district). The adjoining stretches were suffered from not severe erosion. At the same time, the Ba Lat mouth is advanced to the sea and to the North and South direction by the time with a very high rate.The first task of the mathematical modeling of coastal line evolution of Hai Hau is to evaluate this important historical marked periods e. g. to model the coastal line at the periods before 1900, 1935 - 1965; 1965 - 1990; 1990 - 2005. The tasks is very complicated and time and working labors consuming.In the paper, the primarily results of the above mentioned simulations (as waves, currents, sediments transports and bottom - coastal lines evolution) has been shown. Based on the obtained results, there is a strong correlation between the protrusion magnitude and the southward moving of the erosion areas.

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