Relation of Ectoparasite Load to Host Size and Standard Range

1961 ◽  
Vol 47 (6) ◽  
pp. 978 ◽  
Author(s):  
Carl O. Mohr
Keyword(s):  
Host Size ◽  
Ectoparasite Load ◽  
Standard Range

Labeo rohitaandArgulus siamensisinfection: Host size, local inflammatory reaction and immunity modulate ectoparasite load on fish

2017 ◽  
Vol 49 (2) ◽  
pp. 757-766 ◽  
Author(s):  
Sonali Parida ◽  
Amruta Mohapatra ◽  
Jyotirmaya Mohanty ◽  
Pramoda K Sahoo
Keyword(s):  
Inflammatory Reaction ◽  
Host Size ◽  
Local Inflammatory Reaction ◽  
Ectoparasite Load

Comparative Pharmacognostical Evaluation of Khadirashtaka yavakuta (Powder) and Kashaya (Decoction)

2017 ◽  
Vol 9 (10) ◽  
Author(s):  
Chandani Goswami ◽  
V. D. Hitesh Vyas ◽  
Harisha C. R.
Keyword(s):  
Dietary Habits ◽  
Prolonged Exposure ◽  
Skin Diseases ◽  
Metabolic Changes ◽  
Skin Disorders ◽  
Coarse Powder ◽  
Crude Drugs ◽  
Standard Range

Khadirashtaka Kashaya, a compound Ayurvedic formulation is prescribed mainly in the management of Kushtha Vyadhi( skin diseases), Visarp Roga (erysipelous) and Masoorika (type of measels) and it is mentioned in Sangraha Grantha like, Yogaratnakara, Gadanighraha, Bhaishajya Ratnavali. The era is rising with many of novel dietary habits and lifestyle which are ill-assorted with health. Consumption of incompatible food combinations, heavy meals; faulty temperature acclimatisation leads to several metabolic changes which results in unhealthy skin. Their prolonged exposure leads to long lasting dermatological abnormalities having vitiated Rasa and Rakta Dhatu. Khadirashtaka Kashaya helps to break the pathogenesis of skin disorders by its bitter-astringent taste, light and dry properties as well as blood purifying activity. Till date no work was found having comparatively scientifically analysed on this drug. In Present study Khadirashtaka Kashaya and Khadirashtaka choorna have been evaluated for Pharmacognostical analysis. Finished product microscopy and decoction showing the quality and genuineness of all the constituents of Khadirashtaka Kashaya (Decoction) has been done. Organoleptic features of coarse powder made out of the crude drugs were within the standard range

scholarly journals Determinants of lungworm specificity in five cetacean species in the western Mediterranean

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Rachel Pool ◽  
Clara Romero-Rubira ◽  
Juan Antonio Raga ◽  
Mercedes Fernández ◽  
Francisco Javier Aznar
Keyword(s):  
Bottlenose Dolphins ◽  
Parasite Burden ◽  
Western Mediterranean ◽  
Host Size ◽  
Cetacean Species ◽  
Stenella Coeruleoalba ◽  
Species Similarity ◽  
Pilot Whales ◽  
Common Dolphins ◽  
Prey Overlap

Abstract Background Current data about Pseudaliidae show contrasting patterns of host specificity between congeneric species. We investigated how both contact and compatibility between hosts and parasites contributed to the patterns of lungworm infection observed in a community of five species of cetaceans in the western Mediterranean. Methods The lungs of 119 striped dolphins Stenella coeruleoalba, 18 bottlenose dolphins Tursiops truncatus, 7 Risso’s dolphins Grampus griseus, 7 long-finned pilot whales Globicephala melas, and 6 common dolphins Delphinus delphis were analysed for lungworms. Parasites were identified by morphology and analysis of ITS2 sequences using both maximum likelihood and Bayesian inference methods. Body length was used as a proxy for lungworm species fitness in different hosts and compared with Kruskal-Wallis tests. Infection parameters were compared between cetacean species using Fisher’s exact tests and Kruskal-Wallis tests. Phylogenetic specificity was explored by collating the overall lungworm species prevalence values in hosts from previous surveys in various localities. To explore the relative importance of vertical and horizontal transmission, Spearman’s rank correlation was used to look for an association between host size and lungworm burden. A Mantel test was used to explore the association between lungworm species similarity and prey overlap using dietary data. Results Halocercus delphini had higher infection levels in striped dolphins and common dolphins; Stenurus ovatus had higher infection levels in bottlenose dolphins; and Stenurus globicephalae had higher infection levels in long-finned pilot whales. These results are congruent with findings on a global scale. Morphometric comparison showed that the larger nematodes were found in the same host species that had the highest parasite burden. Lungworms were found in neonatal striped dolphins and a Risso’s dolphin, and there was a weak but significant correlation between host size and parasite burden in striped dolphins and bottlenose dolphins. There was also a weak but significant association between prey overlap and lungworm species similarity. Conclusions Data indicate that phylogenetic specificity has an important role in governing host–parasite associations, as indicated by the higher infection levels and larger nematode size in certain hosts. However, diet can also influence infection patterns in these preferred hosts and contribute to less severe infections in other hosts.

Differential dispersal and survival of an African mistletoe: does host size matter?

Plant Ecology ◽  
2007 ◽  
Vol 195 (1) ◽  
pp. 21-31 ◽  
Author(s):  
Lizanne Roxburgh ◽  
Sue W. Nicolson
Keyword(s):  
Host Size ◽  
Size Matter

Prevalence and patterns of infection by the epicaridean parasite, Gyge ovalis and the emergence of intersex in the estuarine mud shrimp, Upogebia major

2013 ◽  
Vol 94 (3) ◽  
pp. 557-566 ◽  
Author(s):  
Jonathan P. Ubaldo ◽  
Takahiro Nanri ◽  
Yoshitake Takada ◽  
Masayuki Saigusa
Keyword(s):  
Tidal Flat ◽  
Abdominal Segment ◽  
Early Infection ◽  
Host Size ◽  
Tidal Level ◽  
Tidal Zone ◽  
Cuticular Ridge ◽  
High Prevalence ◽  
The Seto Inland Sea ◽  
Mud Shrimp

A population of the mud shrimp, Upogebia major, inhabiting Kasaoka Inlet had a higher frequency of intersex males compared to other populations in the Seto Inland Sea, Japan. This population also featured a high prevalence of the branchial epicaridean parasite, Gyge ovalis, and inhabited a tidal flat characterized by increasingly softer sediments going into the lower tidal areas. We examined the rates at which infection co-occurred with intersex features and checked whether infection patterns varied with intersex occurrence according to host size and tidal level position. Fewer specimens were both intersex and infected than those having only one of either condition; infection was not a significant predictor of intersex. However, infection in young hosts that recovered from the parasite could be associated with the intersex morphologies and account for the majority of cases that were intersex but parasite-free. Deletions of the cuticular ridge (CRD) between the first and second abdominal segment and tidal level position were correlated with intersex. Lower tidal zone mud shrimp were, respectively, three and four times more likely to be intersex and exhibit CRD than those in the upper tidal zone. Potentially inclusive factors that may influence these trends are higher rates of early infection and increased exposure to sediment-bound pollutants in mud shrimp inhabiting the lower tidal areas.

scholarly journals SEX-RATIO MANIPULATION BY THE PARASITOID WASPMUSCIDIFURAX RAPTORIN RESPONSE TO HOST SIZE

Evolution ◽  
1993 ◽  
Vol 47 (6) ◽  
pp. 1876-1882 ◽  
Author(s):  
Sandra E. Seidl ◽  
Bethia King
Keyword(s):  
Sex Ratio ◽  
Host Size

scholarly journals Inventory and comparison of abundance of parasitic copepods on fish hosts in the western Wadden Sea (North Sea) between 1968 and 2010

2013 ◽  
Vol 94 (3) ◽  
pp. 547-555 ◽  
Author(s):  
Wouter Koch ◽  
Peter Boer ◽  
Johannes IJ. Witte ◽  
Henk W. Van der Veer ◽  
David W. Thieltges
Keyword(s):  
North Sea ◽  
Wadden Sea ◽  
Temporal Stability ◽  
Parasite Fauna ◽  
Fixed Number ◽  
Fish Host ◽  
Host Size ◽  
Negative Effects ◽  
Parasitic Copepods ◽  
Fish Hosts

A conspicuous part of the parasite fauna of marine fish are ectoparasites, which attach mainly to the fins or gills. The abundant copepods have received much interest due to their negative effects on hosts. However, for many localities the copepod fauna of fish is still poorly known, and we know little about their temporal stability as long-term observations are largely absent. Our study provides the first inventory of ectoparasitic copepods on fish from the western Wadden Sea (North Sea) based on field data from 1968 and 2010 and additional unpublished notes. In total, 47 copepod parasite species have been recorded on 52 fish host species to date. For two copepod species parasitizing the European flounder (Platichthys flesus), a quantitative comparison of infection levels between 1968 and 2010 was possible. Whereas Acanthochondria cornuta did not show a change in the relationship between host size and infection levels, Lepeophtheirus pectoralis shifted towards the infection of smaller hosts, with higher infection levels in 2010 compared to 1968. These differences probably reflect the biology of the species and the observed decrease in abundance and size of flounders during the last decades. The skin-infecting L. pectoralis can probably compensate for dwindling host abundance by infecting smaller fish and increasing its abundance per given host size. In contrast, the gill cavity inhabiting A. cornuta probably faces a spatial constraint (fixed number of gill arches), thus limiting its abundance and setting a minimum for the host size necessary for infections.

Costs of intraspecific and interspecific host sharing in acanthocephalan cystacanths

Parasitology ◽  
2001 ◽  
Vol 122 (4) ◽  
pp. 483-489 ◽  
Author(s):  
B. S. DEZFULI ◽  
L. GIARI ◽  
R. POULIN
Keyword(s):  
Intermediate Host ◽  
Definitive Host ◽  
Interspecific Interactions ◽  
Sympatric Species ◽  
Competitive Interactions ◽  
Host Size ◽  
Intermediate Hosts ◽  
Transmission Success ◽  
Additional Costs ◽  
Net Benefits

Larval helminths often share individual intermediate hosts with other larval worms of the same or different species. In the case of immature acanthocephalans capable of altering the phenotype of their intermediate hosts, the benefits or costs of host sharing can be evaluated in terms of increased or decreased probability of transmission to a suitable definitive host. Competitive interactions among the immature stages of acanthocephalans within the intermediate host could create additional costs of host sharing, however. The effects of intraspecific and interspecific interactions were measured in 3 sympatric species of acanthocephalans exploiting a population of the amphipod Echinogammarus stammeri in the River Brenta, Italy. The strength of interactions was assessed from differences in the size achieved by infective cystacanths in the intermediate host. The size of Pomphorhynchus laevis cystacanths was not correlated with host size, whereas the size of Acanthocephalus clavula and Polymorphus minutus cystacanths increased with host size. Reductions in cystacanth size caused by intraspecific competition were only detected in P. laevis, but may also occur in both A. clavula and P. minutus. When co-occurring in the same amphipod with cystacanths of A. clavula, cystacanths of P. laevis attained a smaller size than when they occurred on their own. This effect was not reciprocal, with the size of A. clavula cystacanths not being affected. This supports earlier suggestions that it is adaptive for A. clavula to associate with P. laevis in amphipod intermediate hosts, with both species going to the same fish definitive hosts. In contrast, cystacanths of P. laevis achieved their largest size when they co-occurred in an amphipod with a cystacanth of P. minutus, which has a different definitive host (i.e. birds). These findings suggest that the net benefits of sharing an intermediate host can only be estimated by taking into account both the effects on transmission success and the consequences for cystacanth development.

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