Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"590 Animals (Zoology)"”.
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A study of aspects of the biology and distribution of freshwater crayfish in the Thames catchment
The results presented in this thesis concern an examination of the biology and distribution of freshwater crayfish in the Thames Catchment. Studies of the distribution of both the native (Austropotamobius pallipes. Lereb.), and an introduced (Pace as acus leniusculus. Dana.) species have been …
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A phyletic analysis of viperine snakes
The intention of the present study is to investigate the problem of cladistic relationships among snakes currently assigned to the subfamily Viperinae, using characters drawn from the internal and external anatomy of preserved museum specimens, and elements of the methodology known as cladistic or …
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Aspects of the biology of fish populations from the Medway Estuary, based on power station intake sampling with special reference to parasitism and pollution
Historical records suggest there has been a decline in the diversity of fish species in the Medway Estuary. The aims of the present study were to assess the type and composition of fish populations currently using the estuary, investigate aspects of their biology and gather information on the …
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A comparison of growth rates of coarse fish in gravel-pit lakes in south-east England and of population structure in selected lakes
Age and growth rates of the coarse fish of 39 gravel-pit lakes in South-East England are compared. Species composition and growth rate are very variable, the commonest species being roach (Rutilus rutilus L.), bream (Abramis brama L.), tench (Tinca tinca L.), perch (Perca fluviatilis L.) and pike …
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Relationships between population density feeding and growth of the roach (Ratilus ratilus, L. 1758) and other coarse fish in a gravel-pit lake in Southern England
… the conservation of a wide range of plants and animals, especially in view of the decline of naturally occurring wetland habitats. Little is known of the biology of gravel-pit lakes; of their flora and fauna or of how these may change with time. Karim (1967) published a paper on the algae of …
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The biology of crayfish plague (Aphanomyces Astaci: Schikora) in Great Britain
… 15*C. Histopathological examinations of infected animals showed the spread of the fungus within the host to be limited. Locally cuticle, epidermis and connective tissue showed most involvement. Although nervous tissue was infected, gross involvement of the nerve chord was not seen and nervous …
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Evolutionary relationships of the discoglossoid frogs - osteological evidence
The discoglossoid Frogs (Discoglossidae and Leiopelmatidae) are generally considered to be the most primitive of the living frogs. Previous authors have grouped them on the basis of common possession of a limited number of primitive features of little phylogenetic significance, leaving the question …
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Experimental studies on the control and regulation of feeding in the common carp, Cyprinus carpio (L. )
… of bombesin and its effect on food intake. Animals held individually and feeding on an operant regime showed no indication that they were feeding in bouts. Satiety was seen to increase exponentially or logarithmically over the course of a feeding session. Small lesions of the NPTh caused a …
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Studies on the neural processing of conspecific songs in the cricket Teleogryllus oceanicus (Le Guillou)
This study involved investigations into the neural processing of auditory information by the Australian field cricket Teleogryllus oceanicus in relation to the identification of its conspecific songs. T. oceanicus males produce three song types related to three different behavioural strategies. …
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The development of motility in spermatozoa
Mammalian spermatozoa acquire the capacity for motility during passage through the epididymis. This study on rat spermatozoa shows that pH, cAMP and protein kinase C (PKC) all play an important role in the initiation of motility. pH has the most critical role and until the initial pH change in …
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A biochemical investigation into aspects of the neuro active amino acid receptor complexes in the insect nervous system
Biochemical investigations were undertaken to study the glutamate (L-glu) and aminobutyric acid (GABA) receptors in the central nervous system (CNS) of the American cockroach, Periplaneta americana. The aim was to provide a simple, quick and cost effective method of screening new chemical entities …
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Aspects of song interaction between the closely related bush cricket genera Platycleis and Metrioptera
This study Is concerned with the behavioural and ecological aspects of the acoustic interaction that occurs when two bush cricket species, Platycleis albopunctata and Metrioptera roeselii. sing together. The effects of the interaction are predominantly one-way and result in inhibition of singing …
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Behavioural assays of the effects of antidepressant drug treatment on the functioning of catecholamine systems
The effects of antidepressant drugs on central beta-adrenergic and dopaminergic receptor function were investigated using the anorexic effects of low doses of amphetamine and apomorphine as assays of beta-adrenergic function and presynaptic dopamine function respectively. Anorexia was typically …
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Evidence for the formation of supplementary corpora lutea in the pregnant and pseudopregnant rat
In a series of experiments investigating a possible post-coitum contraceptive, it was observed that the numbers of corpora lutea (CL) of pregnant Sprague-Dawley (CD) rats were greater than in cyclic, unmated control females (p<0.001). The ontogeny of these supplementary CL (SCL) was established by …
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Comparative studies on the auditory systems of Ensifera
The neural processes of acoustic information was investigated in examples of Ensifera. Sound reception by these insects has two main functions: localization and recognition of the sound source. This study investigated aspects of each of these processes.
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Investigation of the cytogenetics of marine and terrestrial gastropods
The investigation of the chromosomal variation in populations of the land snail Cepaea nemoralis (L.) marine snail Nucella lapillus (L.) is presented. The first study (Part 1) concerns the investigation of the karyotype of C. nemoralis in populations from a region of the Berkshire Downs (U.K.)in …
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A taxonomic re-appraisal of the Passeriformes (Aves) based on the morphology of the plantar surface of the foot
The taxonomy of the Order Passeriformes, at the family level and above, is still in considerable flux. An historical review of the taxonomy, including traditional studies, and more recent works (particularly DNA-DNA hybridization), is given. The present study attempted to analyse little used …
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A phylogenetic study of the Cynipoidea (hymenoptera)
The current classification of the Cynipoldea was subjected to compatibility analysis on the basis of the characters then employed and shown to have a very poor resolution. A comprehensive morphological investigation of 31 exemplar species was undertaken and 234 characters were found, a 450% …
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Interaction between anglers and coarse fish populations in two gravel-pit lakes
The population biology of the coarse fish species in two gravel-pit fisheries (A and B) in Suffolk were studied from 1974 to 1977. Simultaneously the fish caught by anglers and their angling technique were monitored by census. Environmental factors were recorded on each census occasion and the …
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Neurophysiological studies of the response characteristics of auditory fibres in the cricket (Gryllidae orthoptera) with particular reference to Teleogryllus oceanus, (le guillou)
Single unit recordings of primary and central auditory fibers of the cricket Teleogryllus oceanicus show responses to frequencies over the range 1kHz to at least 42kHz. The characteristic frequencies, (ChFs) of units were distributed over most of the bandwidth investigated although few units were …
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