scholarly journals Helminth communities in eels Anguilla anguilla from Adriatic coastal lagoons in Italy

2001 ◽  
Vol 75 (1) ◽  
pp. 7-13 ◽  
Author(s):  
D. Di Cave ◽  
F. Berrilli ◽  
C. De Liberato ◽  
P. Orecchia ◽  
C.R. Kennedy
Keyword(s):  
Coastal Lagoons ◽  
Anguilla Anguilla ◽  
Marine Species ◽  
Intestinal Helminth ◽  
Helminth Communities ◽  
Composition And Structure ◽  
Order Of Magnitude ◽  
Adriatic Coast ◽  
Specialist Species ◽  
High Degree

The composition and diversity of the total and intestinal component and infra-communities were determined in eels Anguilla anguilla from three shallow lagoons on the Adriatic coast of Italy to determine whether the helminth communities would differ in composition and structure from those in eels from lagoons on the Tyrrhenian coast. The lagoons differed in respect of their management regimes and the extent of freshwater influx. Both freshwater and marine species of helminths were found in the eels in all three lagoons, but the freshwater component was richer in Valle Figheri. A suite of three digenean eel specialist species occurred in all three lagoons, of which any two members dominated each community. This conferred a high degree of similarity between the communities of the three lagoons. The same three species also dominated helminth communities in eels in lagoons along the Tyrrhenian coast of Italy, and compositional similarity levels were similar within and between western and eastern groups. Species richness was higher in the component communities of the eels of the Adriatic lagoons when compared to the Tyrrhenian ones, but diversity and dominance indices were of a similar order of magnitude and range. Intestinal helminth communities were richer and more diverse in two of the Adriatic lagoons because the proportion of eels with zero or one helminth species was, unusually, in the minority. It was nevertheless concluded that infracommunity structure was similar in eels from both western and eastern lagoons and that the hypothesis that it would differ in Adriatic lagoons could not be supported. The findings provide further evidence of the similarity in composition and structure of helminth communities in eels from coastal lagoons throughout Europe.

Composition and structure of helminth communities in eels Anguilla anguilla from Italian coastal lagoons

1997 ◽  
Vol 71 (1) ◽  
pp. 35-40 ◽  
Author(s):  
C.R. Kennedy ◽  
D. Di Cave ◽  
F. Berrilli ◽  
P. Orecchia
Keyword(s):  
Coastal Lagoons ◽  
Anguilla Anguilla ◽  
Structural Similarity ◽  
Helminth Species ◽  
Community Level ◽  
Intestinal Helminth ◽  
Helminth Community ◽  
Component Community ◽  
Helminth Communities ◽  
Composition And Structure

AbstractThe composition and diversity of total and intestinal helminth component and infracommunities were determined in eels Anguilla anguilla from four shallow coastal lagoons near Rome. The lagoons differed principally in respect of their salinity. Only Lake Burano still received an input of freshwater, and both freshwater and marine helminth species were found in eels. In the other three lagoons all helminth species were marine or euryhaline and communities were dominated by digeneans. At component community level these three lagoons were far more similar to each other than to Lake Burano, but this distinction almost disappeared at infracommunity level. Species richness and diversity declined with increasing salinity at component community level but not at infracommunity level. Despite the changes and differences in helminth community composition, intestinal helminth infracommunity structure was very similar in all four lagoons and to that in eels from freshwater localities in Britain. The findings thus provide further and unexpected support for the view that some factor(s) other than supply side ones must be operating to produce the fundamental structural similarity in helminth communities in eels.

scholarly journals Composition and diversity of helminth communities in eels Anguilla anguilla in the River Tiber: long-term changes and comparison with insular Europe

1998 ◽  
Vol 72 (4) ◽  
pp. 301-306 ◽  
Author(s):  
C.R. Kennedy ◽  
F. Berrilli ◽  
D. Di Cave ◽  
C. De Liberato ◽  
P. Orecchia
Keyword(s):  
Anguilla Anguilla ◽  
Intestinal Helminth ◽  
European Eel ◽  
British Isles ◽  
Helminth Communities ◽  
Composition And Structure ◽  
Using Data ◽  
The Uk ◽  
Freshwater Eels

AbstractMost studies of helminth communities in the European eel Anguilla anguilla have been undertaken in the British Isles, and there are very few analyses of community composition and structure from continental Europe. To fill this gap and test the hypothesis that helminth communities in freshwater eels in the British Isles are not typical of those of continental Europe, helminth communities of eels in the River Tiber below Rome were analysed by season using data collected in 1980 and new data from 1996. The intestinal helminth communities in the Tiber eels were species poor and characterized by low diversity. Most eels harboured one or no parasite species and communities were heavily dominated by the acanthocephalan Acanthocephalus clavula. Intestinal helminth infra-community richness and diversity did not differ between seasons within a year or between the same seasons in 1980 and 1996, although some changes in composition were apparent. Intestinal infracommunities from Tiber eels were very similar in characteristics to those analysed from the British Isles, and their temporal changes also showed close similarities to those reported from rivers in the UK. It seems likely therefore that conclusions derived from British studies can be applied to helminth communities of eels on the continent.

Richness and diversity of helminth species in eels from a hypersaline coastal lagoon, Mar Menor, south-east Spain

2014 ◽  
Vol 89 (3) ◽  
pp. 345-351
Author(s):  
E. Mayo-Hernández ◽  
J. Peñalver ◽  
A. García-Ayala ◽  
E. Serrano ◽  
P. Muñoz ◽  
...  
Keyword(s):  
Coastal Lagoon ◽  
Coastal Lagoons ◽  
Anguilla Anguilla ◽  
Marine Species ◽  
Dominant Group ◽  
Component Community ◽  
Mar Menor ◽  
Total Prevalence ◽  
Composition And Structure ◽  
Hypersaline Coastal Lagoon

AbstractThe composition and diversity of parasite communities and intestinal components, as well as infra-community structure, were assessed in eels Anguilla anguilla, from Mar Menor, a permanent Mediterranean hypersaline coastal lagoon. Data were used to determine whether this helminth community differs in composition and structure from that of eels in lagoons with lower salinity regimes and higher freshwater inputs. A total prevalence of 93% was detected. Specifically, parasites were identified as Deropristis inflata, Bucephalus anguillae, Contracaecum sp., Anguillicoloides crassus and two plerocercoid larvae belonging to the order Proteocephalidae, the marine species representing 91% of the isolated helminths. In the total community, digenetic trematodes were the dominant group of helminths, and D. inflata, an eel specialist, dominated both the component community and the infra-community. Richness and diversity were low but similar to those reported in other saline lagoons, and maximum species per eel did not exceed four. At the infra-community level, higher abundance than in other brackish or marine Mediterranean environments was detected. The findings provide further evidence of the similarity in composition and structure of helminth communities in eels from various Mediterranean coastal lagoons. Moreover, salinity-dependent specificities are well supported and reflect the life history of individual eels.

Long-term stability in the richness and structure of helminth communities in eels, Anguilla anguilla, in Lough Derg, River Shannon, Ireland

2002 ◽  
Vol 76 (4) ◽  
pp. 315-322 ◽  
Author(s):  
C.R. Kennedy ◽  
C. Moriarty
Keyword(s):  
Community Diversity ◽  
Large Rivers ◽  
Small Rivers ◽  
Intestinal Helminth ◽  
Helminth Parasites ◽  
Component Community ◽  
Data Set ◽  
Helminth Communities ◽  
Composition And Structure ◽  
Acanthocephalus Lucii

AbstractA data set on intestinal helminth parasites was collected in the course of an 18 year investigation into the biology of eels in Meelick Bay, Lough Derg, River Shannon. This was used to test two hypotheses relating to the composition and structure of intestinal helminth communities, namely that eels in large rivers do not harbour richer and more diverse communities than those in small rivers but that community composition and structure are more stable over time than in small rivers. The helminth community was species poor, with only six species comprising the component community and a maximum infracommunity richness of three species. The community was overwhelmingly dominated by the acanthocephalan Acanthocephalus lucii, reflecting the importance of its intermediate host Asellus aquaticus in the eels' diet. The remaining helminth species contributed to species richness but made very little contribution to community diversity. Population levels of Acanthocephalus lucii fell and remained low between 1992 and 2000, probably reflecting increased movement of eels from other parts of the lough into Meelick Bay. Diversity values were low, but similar to those reported from other rivers in Britain and Europe. The results provided support for both hypotheses and indicated that in respect of richness, diversity and dominance, the helminth communities of eels in the River Shannon were typical of, and comparable to, those of other large rivers throughout Europe.

Richness and diversity of intestinal metazoan communities in brown trout Salmo trutta compared to those of eels Anguilla anguilla in their European heartlands

Parasitology ◽  
2000 ◽  
Vol 121 (1) ◽  
pp. 55-64 ◽  
Author(s):  
C. R. KENNEDY ◽  
R. A. HARTVIGSEN
Keyword(s):  
Community Structure ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Interspecific Interactions ◽  
Anguilla Anguilla ◽  
Intestinal Helminth ◽  
Published Data ◽  
European Eel ◽  
Character Species ◽  
Helminth Communities

The hypothesis that intestinal helminth communities in freshwater brown trout are dissimilar in composition and structure to those in the European eel was tested by an analysis of component communities from 72 localities and of infracommunities from 34 localities in the British Isles and Norway. Derived indices were then compared with published data from eels. Composition of helminth communities differed considerably between the two hosts as a group of 4 species occurred commonly in trout and so gave greater predictability to the community composition. These 4 species were trout specialists and in 97% of the localities a trout specialist dominated the community rather than a generalist acanthocephalan as is typical for eels. By contrast all measures of community structure and indices of richness and diversity indicated that helminth communities in trout were isolationist in character, species poor and exhibited low diversity at both component and infracommunity levels. All values of indices for trout helminth communities were strikingly similar to those obtained from eels. Evidence of interspecific interactions within the trout helminth communities and a limit of 4 to infracommunity species richness further enhanced the similarities and suggested a common determinant of community structure. The hypothesis was thus supported in respect of species composition but refuted in respect of community structure.

Organochlorine pesticides and PCBs in European eel (Anguilla anguilla) from Spanish Balearic coastal lagoons

2021 ◽  
Vol 350 ◽  
pp. S182
Author(s):  
A. Pérez-Vegas ◽  
M. Pérez-López ◽  
E. Barcala ◽  
E. Trofimova ◽  
D. Romero ◽  
...  
Keyword(s):  
Organochlorine Pesticides ◽  
Coastal Lagoons ◽  
Anguilla Anguilla ◽  
European Eel

scholarly journals NEAR-SHORE FLOATING WAVE ENERGY CONVERTERS: APPLICATIONS FOR COASTAL PROTECTION

2011 ◽  
Vol 1 (32) ◽  
pp. 61 ◽  
Author(s):  
Piero Ruol ◽  
Barbara Zanuttigh ◽  
Luca Martinelli ◽  
Peter Kofoed ◽  
Peter Frigaard
Keyword(s):  
Sediment Transport ◽  
Wave Energy ◽  
Coastal Protection ◽  
Transmission Characteristics ◽  
Body Type ◽  
Wave Energy Converters ◽  
Physical Model Tests ◽  
Order Of Magnitude ◽  
Adriatic Coast ◽  
Near Shore

Aim of this note is to analyse the possible application of a Wave Energy Converter (WEC) as a combined tool to protect the coast and harvest energy. Physical model tests are used to evaluate wave transmission past a near-shore floating WEC of the wave activated body type, named DEXA. Efficiency and transmission characteristics are approximated to functions of wave height, period and obliquity. Their order of magnitude are 20% and 80%, respectively. It is imagined that an array of DEXA is deployed in front of Marina di Ravenna beach (IT), a highly touristic site of the Adriatic Coast. Based on the CERC formula, long-shore sediment transport is evaluated in presence and in absence of this array of DEXAs. The sediment transport in this site is quite large and frequently changes directions during the year. The larger North directed contribution and the more persistent South directed one are similar in magnitude and almost compensate each other, with the latter only slightly prevailing. It is shown that the DEXA could be designed so that the effect on sediment transport becomes quite significant and the direction of the net transport can be reversed.

TORSION BALANCE STEP ANOMALIES IN NORTHERN TILLMAN COUNTY, OKLAHOMA

Geophysics ◽  
1945 ◽  
Vol 10 (4) ◽  
pp. 507-525
Author(s):  
K. Klaus
Keyword(s):  
Cross Sections ◽  
Torsion Balance ◽  
Second Derivative ◽  
Contour Maps ◽  
Probability Rating ◽  
Order Of Magnitude ◽  
Wichita Mountains ◽  
Gravity Map ◽  
High Degree ◽  
Quantitative Calculations

The results of a semi‐detailed areal torsion balance survey in Southwestern Oklahoma are shown by means of a gradient‐curvature map, a gravity map, two second derivative contour maps, and gravity and second derivative profiles. Detailed quantitative calculations were made of a number of geological cross sections, two of which are shown in Figs. 8 and 9. Fig. 9 represents the subsurface situation with the highest probability rating, since it combines a high degree of geological probability with the fact that it will reproduce the gravity and second derivative curves of Figs. 6 and 7 very closely. This interpretation embodies a fault with a throw of the order of magnitude of 10,000 feet. If this interpretation is substantially correct, it implies a thick sedimentary section in the down‐thrown block, which might be of great economic interest in prospecting for oil. A comparison of the gravity and second derivative data may be of interest to the geophysicist. The geologist may find the results of this survey interesting because of their possible bearing on the orogeny of the Wichita Mountains.

A COMPARISON OF THE INTESTINAL HELMINTH COMMUNITIES OF EQUIDAE IN SOUTHERN AFRICA

2004 ◽  
Vol 90 (6) ◽  
pp. 1263-1273 ◽  
Author(s):  
Sonja Matthee ◽  
Rosina C. Krecek ◽  
Melodie A. McGeoch
Keyword(s):  
Southern Africa ◽  
Intestinal Helminth ◽  
Helminth Communities
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