Pub Date : 2013-07-12DOI: 10.1080/00269786.1977.10736290
R. Nagabhushanam, K. Kulkarni
SUMMARY 1. The changes in the biochemical constituents of the soft body tissues and hepatopancreas of Emerita holthuisi Sankolli (Decapoda Anomura) were studied at monthly intervals for 1 year to determine their variability in the course of the reproductive cycle. 2. The water content remained at a high level during the monsoon season i.e. from July to September. It was at moderate level from October to January followed by a slight decrease during the period from February to June. 3. Protein, glycogen and fat of hepatopancreas were correlated with reproductive activity. During ripening of the gonads protein, glycogen and fat of the soft body parts and the hepatopancreas were increased. During the intensive spawning period all values fell considerably reaching minimum values at the end of the spawning period.
{"title":"SEASONAL CHANGES IN BIOCHEMICAL COMPOSITION OF THE SAND CRAB EMERITA HOLTHUISI SANKOLLI (DECAPODA ANOMURA)","authors":"R. Nagabhushanam, K. Kulkarni","doi":"10.1080/00269786.1977.10736290","DOIUrl":"https://doi.org/10.1080/00269786.1977.10736290","url":null,"abstract":"SUMMARY 1. The changes in the biochemical constituents of the soft body tissues and hepatopancreas of Emerita holthuisi Sankolli (Decapoda Anomura) were studied at monthly intervals for 1 year to determine their variability in the course of the reproductive cycle. 2. The water content remained at a high level during the monsoon season i.e. from July to September. It was at moderate level from October to January followed by a slight decrease during the period from February to June. 3. Protein, glycogen and fat of hepatopancreas were correlated with reproductive activity. During ripening of the gonads protein, glycogen and fat of the soft body parts and the hepatopancreas were increased. During the intensive spawning period all values fell considerably reaching minimum values at the end of the spawning period.","PeriodicalId":19014,"journal":{"name":"Monitore Zoologico Italiano-Italian Journal of Zoology","volume":"71 1","pages":"57-64"},"PeriodicalIF":0.0,"publicationDate":"2013-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82806529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-07-12DOI: 10.1080/00269786.1981.10736373
P. D. P. Polver, S. Barni, R. Nano
SUMMARY The mucosa of the urinary bladder of Salamandra salamandra (L.) (Amphibia Caudata) was studied by electron microscopy. Its epithelium basically consists of three cell types: (i) «granular cells» which are flattened and characterized by a layer of granules of mucous secretion, by abundant filamentous material and by occasionally anomalous mitochondria, while their free surface shows many microvilli and a distinct fuzzy coat; (ii) «mitochondria-rich cells», with a typical flask shape and abundance of mitochondria; (iii) rare basal cells. The epithelial cells are connected by typical junctions, adjacent membranes exhibiting deep infoldings. Thus in the urinary bladder of an urodele amphibian, as previously observed in anuran amphibians, it has been possible to demonstrate the presence of structural devices which can be related to water and ion resorption.
{"title":"ULTRASTRUCTURE OF THE URINARY BLADDER OF SALAMANDRA SALAMANDRA (L.) (AMPHIBIA CAUDATA)","authors":"P. D. P. Polver, S. Barni, R. Nano","doi":"10.1080/00269786.1981.10736373","DOIUrl":"https://doi.org/10.1080/00269786.1981.10736373","url":null,"abstract":"SUMMARY The mucosa of the urinary bladder of Salamandra salamandra (L.) (Amphibia Caudata) was studied by electron microscopy. Its epithelium basically consists of three cell types: (i) «granular cells» which are flattened and characterized by a layer of granules of mucous secretion, by abundant filamentous material and by occasionally anomalous mitochondria, while their free surface shows many microvilli and a distinct fuzzy coat; (ii) «mitochondria-rich cells», with a typical flask shape and abundance of mitochondria; (iii) rare basal cells. The epithelial cells are connected by typical junctions, adjacent membranes exhibiting deep infoldings. Thus in the urinary bladder of an urodele amphibian, as previously observed in anuran amphibians, it has been possible to demonstrate the presence of structural devices which can be related to water and ion resorption.","PeriodicalId":19014,"journal":{"name":"Monitore Zoologico Italiano-Italian Journal of Zoology","volume":"12 1","pages":"123-132"},"PeriodicalIF":0.0,"publicationDate":"2013-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87753962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-07-12DOI: 10.1080/00269786.1983.10736439
T. Ristori, G. Rosati
SUMMARY The eyespot region of the green flagellate alga Haematococcus pluvialis Flotow (Clorophyceae) was investigated by electron microscopy in order to identify any possible specialization of the plasmalemma and the outer chloroplast envelope membrane connected with photoreception. In this alga, the distance between the outer chloroplast membrane and the plasmalemma in the eyespot region is variable. In some thin sections in this region, the inner limiting membrane of the chloroplast is more electron dense than the outer, while the thickness of the plasmalemma opposite the eyespot shows no appreciable difference with respect to other parts of the cell. The possible functional significance of these findings and the possibility that the eyespot in Haematococcus pluvialis serves as a shading device are both discussed.
{"title":"THE EYESPOT MEMBRANES OF HAEMATOCOCCUS PLUVIALIS FLOTOW (CHLOROPHYCEAE): THEIR ULTRASTRUCTURE AND POSSIBLE SIGNIFICANCE IN PHOTOTAXIS","authors":"T. Ristori, G. Rosati","doi":"10.1080/00269786.1983.10736439","DOIUrl":"https://doi.org/10.1080/00269786.1983.10736439","url":null,"abstract":"SUMMARY The eyespot region of the green flagellate alga Haematococcus pluvialis Flotow (Clorophyceae) was investigated by electron microscopy in order to identify any possible specialization of the plasmalemma and the outer chloroplast envelope membrane connected with photoreception. In this alga, the distance between the outer chloroplast membrane and the plasmalemma in the eyespot region is variable. In some thin sections in this region, the inner limiting membrane of the chloroplast is more electron dense than the outer, while the thickness of the plasmalemma opposite the eyespot shows no appreciable difference with respect to other parts of the cell. The possible functional significance of these findings and the possibility that the eyespot in Haematococcus pluvialis serves as a shading device are both discussed.","PeriodicalId":19014,"journal":{"name":"Monitore Zoologico Italiano-Italian Journal of Zoology","volume":"27 1","pages":"401-408"},"PeriodicalIF":0.0,"publicationDate":"2013-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90910267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-07-12DOI: 10.1080/00269786.1986.10736500
M. T. M. Piccioli, C. Calloni, G. Delfino
SUMMARY The development of the end apparatus and excretory duct is described in the Van der Vecht glands of Polistes gallicus (L.) (Hymenoptera Vespidae). The precocious gland buds consist of clusters of three blastocytes wrapped round each other. The external cell represents the prospective secretory cell, and the inner ones the accessory (or ductular) cells. Numerous cytoplasmatic processes emanate from the apical surface of the external blastocyte: microvilli and a long axonemal structure, which act as moulds in the synthetic processes of the cuticular end apparatus and excretory duct respectively. These processes are performed by the prospective secretory cells (end apparatus) and accessory cells (excretory duct). The above findings are discussed and compared with the current morphogenesis patterns concerning the development of the secretion collection and release complex in the exocrine glands of Arthropoda. The fundamental role of cytoplasmic outgrowths during their development is emphasized.
本文描述了膜翅目蜜蜂科(Polistes gallicus (L.)) Van der Vecht腺的末端器官和排泄管的发育。早熟腺芽由三个胚细胞相互缠绕的簇组成。外部细胞代表未来的分泌细胞，内部细胞代表附属(或导管)细胞。许多细胞质突起从外胚细胞的顶端表面产生:微绒毛和长轴突结构，它们分别在角质层末端器和排泄管的合成过程中起着模具的作用。这些过程是由前瞻性分泌细胞(终末器官)和副细胞(排泄管)完成的。本文将上述研究结果与节肢动物外分泌腺分泌收集和释放复合物发育的形态发生模式进行了讨论和比较。强调细胞质生长在其发育过程中的基本作用。
{"title":"DEVELOPMENT OF THE «END APPARATUS» AND EXCRETORY DUCT IN THE VAN DER VECHT GLANDS OF POLISTES GALLICUS (L.) (HYMENOPTERA VESPIDAE)","authors":"M. T. M. Piccioli, C. Calloni, G. Delfino","doi":"10.1080/00269786.1986.10736500","DOIUrl":"https://doi.org/10.1080/00269786.1986.10736500","url":null,"abstract":"SUMMARY The development of the end apparatus and excretory duct is described in the Van der Vecht glands of Polistes gallicus (L.) (Hymenoptera Vespidae). The precocious gland buds consist of clusters of three blastocytes wrapped round each other. The external cell represents the prospective secretory cell, and the inner ones the accessory (or ductular) cells. Numerous cytoplasmatic processes emanate from the apical surface of the external blastocyte: microvilli and a long axonemal structure, which act as moulds in the synthetic processes of the cuticular end apparatus and excretory duct respectively. These processes are performed by the prospective secretory cells (end apparatus) and accessory cells (excretory duct). The above findings are discussed and compared with the current morphogenesis patterns concerning the development of the secretion collection and release complex in the exocrine glands of Arthropoda. The fundamental role of cytoplasmic outgrowths during their development is emphasized.","PeriodicalId":19014,"journal":{"name":"Monitore Zoologico Italiano-Italian Journal of Zoology","volume":"12 1","pages":"221-240"},"PeriodicalIF":0.0,"publicationDate":"2013-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85175712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-07-12DOI: 10.1080/00269786.1988.10736553
S. Parmigiani, A. Sgoifo, D. Mainardi
SUMMARY The parental aggression of female mice (Mus domesticus Rutty) towards strange conspecifics known to vary in their tendency to commit infanticide was examined. Twenty-four hours after stud males removal, resident lactating females (with pups aged 3–5 days) were confronted with the following types of intruders: the reintroduced stud, i.e. the father of the pups, a strange father, sexually naive and recently sexually experienced (24 hr prior testing) males, virgin females. Parental attack was mainly elicited by sexually naive and recently sexually experienced males which were also most likely to kill and cannibalize pups. The stud males did not show infanticide and were never attacked. Remarkably, strange fathers were rarely attacked by lactating females and they rarely killed unrelated pups. The data seem to support the view that lactating female mice might be capable of assessing the infanticidal potential of conspecific intruders and of adopting the most appropriate behavioural strategy. Although ...
{"title":"PARENTAL AGGRESSION DISPLAYED BY FEMALE MICE IN RELATION TO THE SEX, REPRODUCTIVE STATUS AND INFANTICIDAL POTENTIAL OF CONSPECIFIC INTRUDERS","authors":"S. Parmigiani, A. Sgoifo, D. Mainardi","doi":"10.1080/00269786.1988.10736553","DOIUrl":"https://doi.org/10.1080/00269786.1988.10736553","url":null,"abstract":"SUMMARY The parental aggression of female mice (Mus domesticus Rutty) towards strange conspecifics known to vary in their tendency to commit infanticide was examined. Twenty-four hours after stud males removal, resident lactating females (with pups aged 3–5 days) were confronted with the following types of intruders: the reintroduced stud, i.e. the father of the pups, a strange father, sexually naive and recently sexually experienced (24 hr prior testing) males, virgin females. Parental attack was mainly elicited by sexually naive and recently sexually experienced males which were also most likely to kill and cannibalize pups. The stud males did not show infanticide and were never attacked. Remarkably, strange fathers were rarely attacked by lactating females and they rarely killed unrelated pups. The data seem to support the view that lactating female mice might be capable of assessing the infanticidal potential of conspecific intruders and of adopting the most appropriate behavioural strategy. Although ...","PeriodicalId":19014,"journal":{"name":"Monitore Zoologico Italiano-Italian Journal of Zoology","volume":"196 1","pages":"193-201"},"PeriodicalIF":0.0,"publicationDate":"2013-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83126010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-07-12DOI: 10.1080/03749444.1979.10736597
B. Lanza
SUMMARY Description of a new Somali (Afgoi: 02°06'N-45°11'E) Elapsoidea with small (in adult) and strongly depressed head, obtusely pointed snout, grey chin region, vertical diameter of the eye greater than its distance from the upper lip, juvenile with white head and without transverse bands: Elapsoidea chelazzii n. sp. (Serpentes Elapidae). The genus is new to Somalia.
索马里一种新的Elapsoidea (Afgoi: 02°06′n -45°11′e)，小(成虫)且头部强烈凹陷，鼻部钝尖，下巴呈灰色，眼的垂直直径大于离上唇的距离，幼鱼头白色，无横带:Elapsoidea chelazzii n. sp.(蛇科)。该属是索马里的新物种。
{"title":"ELAPSOIDEA CHELAZZII, A NEW ELAPID SNAKE FROM SOMALIA","authors":"B. Lanza","doi":"10.1080/03749444.1979.10736597","DOIUrl":"https://doi.org/10.1080/03749444.1979.10736597","url":null,"abstract":"SUMMARY Description of a new Somali (Afgoi: 02°06'N-45°11'E) Elapsoidea with small (in adult) and strongly depressed head, obtusely pointed snout, grey chin region, vertical diameter of the eye greater than its distance from the upper lip, juvenile with white head and without transverse bands: Elapsoidea chelazzii n. sp. (Serpentes Elapidae). The genus is new to Somalia.","PeriodicalId":19014,"journal":{"name":"Monitore Zoologico Italiano-Italian Journal of Zoology","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2013-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82299898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-07-12DOI: 10.1080/03749444.1972.10736784
G. Frey
RIASSUNTO L'Autore elenca 2 specie di Oniticellini e 21 di Onthophagini dell'Africa orientale; descrive inoltre la nuova specie Onthophagus martellii della Tanzania (Monte Meru).
{"title":"ÜBER EINIGE ONITICELLINI UND ONTHOPHAGINI AUS OSTAFRIKA MIT BESCHREIBUNG EINER NEUEN ART (COLEOPTERA SCARABAEIDAE): PUBBLICAZIONI DEL CENTRO DI STUDIO PER LA FAUNISTICA ED ECOLOGIA TROPICALI DEL C.N.R.: LXV","authors":"G. Frey","doi":"10.1080/03749444.1972.10736784","DOIUrl":"https://doi.org/10.1080/03749444.1972.10736784","url":null,"abstract":"RIASSUNTO L'Autore elenca 2 specie di Oniticellini e 21 di Onthophagini dell'Africa orientale; descrive inoltre la nuova specie Onthophagus martellii della Tanzania (Monte Meru).","PeriodicalId":19014,"journal":{"name":"Monitore Zoologico Italiano-Italian Journal of Zoology","volume":"20 1","pages":"309-316"},"PeriodicalIF":0.0,"publicationDate":"2013-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81731024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-07-12DOI: 10.1080/00269786.1971.10736168
R. Argano, L. Bullini, C. Consiglio, G. Mura, E. Raffaelli
SUMMARY AND CONCLUSIONS The comparative study of the populations of Sphaeroma senatum of the Isle of Capri and of Immacolatella Vecchia (Naples) has yielded the following results: 1. Sphaeroma capreae Verhoeff was not found to be a valid species and the following synonymy is therefore proposed: Sphaeroma capreae Verhoeff, 1941 = Sphaeroma senatum (Fa- bricius, 1787), n. syn. 2. As compared to the Neaples population, that of Capri showed—in our laboratory conditions—a lower fecundity, a longer period of gestation and post-embryonic development. The hybrids were found to be mostly intermediate for the same characteristics. 3. Significant differences exist in the morphology of the two populations (shape of the male pleopod II endopodite and length and curvature of appendix masculina) and in the extent of variability in colour and pattern.
{"title":"STUDIES ON AN ISLAND POPULATION OF SPHAEROMA SERRATUM (F.) (CRUSTACEA ISOPODA FLABELLIFERA)","authors":"R. Argano, L. Bullini, C. Consiglio, G. Mura, E. Raffaelli","doi":"10.1080/00269786.1971.10736168","DOIUrl":"https://doi.org/10.1080/00269786.1971.10736168","url":null,"abstract":"SUMMARY AND CONCLUSIONS The comparative study of the populations of Sphaeroma senatum of the Isle of Capri and of Immacolatella Vecchia (Naples) has yielded the following results: 1. Sphaeroma capreae Verhoeff was not found to be a valid species and the following synonymy is therefore proposed: Sphaeroma capreae Verhoeff, 1941 = Sphaeroma senatum (Fa- bricius, 1787), n. syn. 2. As compared to the Neaples population, that of Capri showed—in our laboratory conditions—a lower fecundity, a longer period of gestation and post-embryonic development. The hybrids were found to be mostly intermediate for the same characteristics. 3. Significant differences exist in the morphology of the two populations (shape of the male pleopod II endopodite and length and curvature of appendix masculina) and in the extent of variability in colour and pattern.","PeriodicalId":19014,"journal":{"name":"Monitore Zoologico Italiano-Italian Journal of Zoology","volume":"45 1","pages":"91-98"},"PeriodicalIF":0.0,"publicationDate":"2013-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81760244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-07-12DOI: 10.1080/03749444.1978.10736579
A. Grandison
SUMMARY Information concerning the thigh myology, osteology of the skull and postcranial skeleton, external morphology and life history of two high elevation Ethiopian bufonids, one of which was previously known as Bufo osgoodi Loveridge, 1932, is presented and analysed and a comparison made with all the species currently assigned to Nectophrynoides Noble, 1926, with the exception of N. minutus Perret, 1972 of which no examples were available. The genus Nectophrynoides is redefined according to 25 characters and Bufo osgoodi transferred to it. The other Ethiopian form, which has inguinal amplexus, internal fertilisation and a terrestrial tadpole lacking larval mouthparts, is described as a new species (Nectophrynoides malcolmi). Reference is made to the morphological characteristics of other genera of bufonids.
{"title":"THE OCCURRENCE OF NECTOPHRYNOIDES (ANURA BUFONIDAE) IN ETHIOPIA. A NEW CONCEPT OF THE GENUS WITH A DESCRIPTION OF A NEW SPECIES","authors":"A. Grandison","doi":"10.1080/03749444.1978.10736579","DOIUrl":"https://doi.org/10.1080/03749444.1978.10736579","url":null,"abstract":"SUMMARY Information concerning the thigh myology, osteology of the skull and postcranial skeleton, external morphology and life history of two high elevation Ethiopian bufonids, one of which was previously known as Bufo osgoodi Loveridge, 1932, is presented and analysed and a comparison made with all the species currently assigned to Nectophrynoides Noble, 1926, with the exception of N. minutus Perret, 1972 of which no examples were available. The genus Nectophrynoides is redefined according to 25 characters and Bufo osgoodi transferred to it. The other Ethiopian form, which has inguinal amplexus, internal fertilisation and a terrestrial tadpole lacking larval mouthparts, is described as a new species (Nectophrynoides malcolmi). Reference is made to the morphological characteristics of other genera of bufonids.","PeriodicalId":19014,"journal":{"name":"Monitore Zoologico Italiano-Italian Journal of Zoology","volume":"118 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2013-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81779663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-07-12DOI: 10.1080/00269786.1984.10736466
P. Ioalé
SUMMARY Two experiments of KEETON (1971), which aimed at verifying the effect of magnetic stimuli perceived during flight on the orientation of homing pigeons, had left some open questions, in particular the very small effect on homing performance, even when there was a considerable disturbance of initial orientation. These experiments were repeated using more rigorous methods. Adult pigeons equipped with bar magnets showed a complete initial disorientation when released under overcast skies. However, contrary to the findings reported by KEETON, the same magnets had no effect when the releases were performed in sunny conditions, even when 3-month-old inexperienced pigeons were used. Homing performance was not influenced in an appreciable way, even though, in three out of four experiments carried out when the sun was not visible, the total cloud cover extended over a wide area and lasted for a long time so excluding the use of the sun compass for the greater part of the homing flights.
{"title":"MAGNETS AND PIGEON ORIENTATION","authors":"P. Ioalé","doi":"10.1080/00269786.1984.10736466","DOIUrl":"https://doi.org/10.1080/00269786.1984.10736466","url":null,"abstract":"SUMMARY Two experiments of KEETON (1971), which aimed at verifying the effect of magnetic stimuli perceived during flight on the orientation of homing pigeons, had left some open questions, in particular the very small effect on homing performance, even when there was a considerable disturbance of initial orientation. These experiments were repeated using more rigorous methods. Adult pigeons equipped with bar magnets showed a complete initial disorientation when released under overcast skies. However, contrary to the findings reported by KEETON, the same magnets had no effect when the releases were performed in sunny conditions, even when 3-month-old inexperienced pigeons were used. Homing performance was not influenced in an appreciable way, even though, in three out of four experiments carried out when the sun was not visible, the total cloud cover extended over a wide area and lasted for a long time so excluding the use of the sun compass for the greater part of the homing flights.","PeriodicalId":19014,"journal":{"name":"Monitore Zoologico Italiano-Italian Journal of Zoology","volume":"14 1","pages":"347-358"},"PeriodicalIF":0.0,"publicationDate":"2013-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81840755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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