Letteratura scientifica selezionata sul tema "Marsupialia Reproduction"
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Articoli di riviste sul tema "Marsupialia Reproduction"
1
Kitchener, DJ, N. Cooper e a. Bradley. "Reproduction in Male Ningaui (Marsupialia, Dasyuridae)". Wildlife Research 13, n. 1 (1986): 13. http://dx.doi.org/10.1071/wr9860013.
Testo completoAbstract (sommario):
'Stages in the spermatogenic cycle of Ningaui ridei, N. yvonneae and N. timealeyi are defined and the phenology of these stages is presented. In males of Ningaui spp. sexual maturity is reached in the first year, such that after the end of July of each year almost all male Ningaui spp. are considered reproductively mature. Male Ningaui spp. in the active spermatogenic phase are found during the entire season of births (August-January in N. ridei and N. timealeyi but perhaps terminating earlier in N. yvonneae); testes regress to an immature spermatogenic stage after January. There is no indication that in the field adult males die immediately following mating.
2
Nelson, JE, e A. Goldstone. "Reproduction in Peradorcas-Concinna (Marsupialia, Macropodidae)". Wildlife Research 13, n. 4 (1986): 501. http://dx.doi.org/10.1071/wr9860501.
Testo completoAbstract (sommario):
The length of the oestrous cycle in captive Peradorcas concinna was 33.73 � 1.65 days (n = 52). Females which were dominant over other females or were alone with their young had a cycle length of about 32 days and subordinate females had a cycle length of about 35 days. Some observations on the growth of the young are presented. Weaning is very abrupt; final pouch exit occurs about 2 weeks after the first pouch exit, and is caused by the female's aggressiveness towards its young.
3
Woolley, PA, e A. Valente. "Reproduction in Sminthopsis-Longicaudata (Marsupialia, Dasyuridae) - Laboratory Observations". Wildlife Research 13, n. 1 (1986): 7. http://dx.doi.org/10.1071/wr9860007.
Testo completoAbstract (sommario):
Observations on the pattern of reproduction in Sminthopsis longicaudata, at present considered to be an endangered species, are presented. S. longicaudata is polyoestrous and in the laboratory females are in breeding condition from late winter (August) to early summer (December). They enter oestrus up to four times during the breeding season. Two litters were born 17 and 19 days post-mating, but the gestation period may be less than 15 days. The mean length of the oestrous cycle is 34.4 days. Both males and females may be able to breed in more than one season.
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Woolley, PA. "Reproduction in Dasykaluta-Rosamondae (Marsupialia, Dasyuridae) - Field and Laboratory Observations". Australian Journal of Zoology 39, n. 5 (1991): 549. http://dx.doi.org/10.1071/zo9910549.
Testo completoAbstract (sommario):
Observations on reproduction in both wild-caught and laboratory-maintained Dasykaluta rosamondae have led to the conclusion that this species is one of 10 dasyurid marsupials in which males die soon after their first mating period. D. rosamondae have a short annual breeding season. The females are monoestrous, mating in September and bearing the young in November. Laboratory-reared young are weaned at an age of about 3 1/2-4 months, in February and March, and juveniles appear in the field population at this time. Both mates and females reach sexual maturity at an age of about 10 months. In the laboratory, males breed in only one season, after which those that survive become reproductively senile. Mature males disappear from the field population about the time the young are born; those collected shortly before this show signs of reproductive senescence. Males collected in the months after the young are weaned represent a single age-class; their reproductive development parallels that of maturing known-age males. Females are capable of breeding in at least two seasons and litters of up to eight are reared. Development of the pouch young is described. Unusual interstitial tissue masses develop in the ovaries of D. rosamondae; the granulosa cells of some follicles undergo transformation to interstitial cells, and the oocytes in these follicles degenerate, shortly before the females enter oestrus.
5
Hogan, Lindsay A., Tina Janssen e Stephen D. Johnston. "Wombat reproduction (Marsupialia; Vombatidae): an update and future directions for the development of artificial breeding technology". REPRODUCTION 145, n. 6 (giugno 2013): R157—R173. http://dx.doi.org/10.1530/rep-13-0012.
Testo completoAbstract (sommario):
This review provides an update on what is currently known about wombat reproductive biology and reports on attempts made to manipulate and/or enhance wombat reproduction as part of the development of artificial reproductive technology (ART) in this taxon. Over the last decade, the logistical difficulties associated with monitoring a nocturnal and semi-fossorial species have largely been overcome, enabling new features of wombat physiology and behaviour to be elucidated. Despite this progress, captive propagation rates are still poor and there are areas of wombat reproductive biology that still require attention, e.g. further characterisation of the oestrous cycle and oestrus. Numerous advances in the use of ART have also been recently developed in the Vombatidae but despite this research, practical methods of manipulating wombat reproduction for the purposes of obtaining research material or for artificial breeding are not yet available. Improvement of the propagation, genetic diversity and management of wombat populations requires a thorough understanding of Vombatidae reproduction. While semen collection and cryopreservation in wombats is fairly straightforward there is currently an inability to detect, induce or synchronise oestrus/ovulation and this is an impeding progress in the development of artificial insemination in this taxon.
6
Wooley, P. A. "Observations on Reproduction in Captive Parantechinus biiarni (Marsupialia: Dasyuridae)". Australian Mammalogy 18, n. 1 (1995): 83. http://dx.doi.org/10.1071/am95083.
Testo completo
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WARD, S. J., e M. B. RENFREE. "Reproduction in females of the feathertail gliderAcrobates pygmaeus(Marsupialia)". Journal of Zoology 216, n. 2 (ottobre 1988): 225–39. http://dx.doi.org/10.1111/j.1469-7998.1988.tb02427.x.
Testo completo
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WARD, S. J., e M. B. RENFREE. "Reproduction in males of the feathertail gliderAcrobates pygmaeus(Marsupialia)". Journal of Zoology 216, n. 2 (ottobre 1988): 241–51. http://dx.doi.org/10.1111/j.1469-7998.1988.tb02428.x.
Testo completo
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Woolley, PA. "Reproduction in Sminthopsis-Macroura (Marsupialia, Dasyuridae) .1. The Female". Australian Journal of Zoology 38, n. 2 (1990): 187. http://dx.doi.org/10.1071/zo9900187.
Testo completoAbstract (sommario):
A laboratory colony of S. macroura, founded by three females and four males, was maintained over four breeding seasons. Reproductive success was high and four generations were produced before the colony was disbanded. Descendants of these animals are still breeding in another laboratory 11 years after the founding of the colony. A detailed prescription for the maintenance and management of a breeding colony is given. The animals bred between June and February, most females first entering oestrus in the early months of the season, in July or August. Female young born early in the season (before mid-October) matured in the season of their birth at an age of 86-159 days; those born later matured in the following season at an age of 185-262 days. In each group, those born later matured earlier. Minimum body weight at sexual maturity was 12.5 g. At least two litters can be reared in a season and individuals may breed in more than one season. S. macroura is polyoestrous with a mean cycle length of 23.25 days. The gestation period is about 11 days and up to eight young can be accommodated in the pouch. Lactating females may return to oesrrus up to 10 days before the young are weaned at 70 days old. Ovulation occurs spontaneously and the mean number of corpora lutea formed was 20.7. The corpora lutea reach maximal size late in pregnancy and they regress more rapidly in lactating than in non- lactating females. Up to three generations of corpora lutea could be recognised in the ovaries of females undergoing cycles uninterrupted by lactation. Changes In body weight, the pouch, and the gross and histological appearance of the reproductive tract were the same in pregnant and pseudopregnant females.
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Woolley, PA. "Reproduction in Sminthopsis-Macroura (Marsupialia, Dasyuridae) .2. The Male". Australian Journal of Zoology 38, n. 2 (1990): 207. http://dx.doi.org/10.1071/zo9900207.
Testo completoAbstract (sommario):
The breeding season of S. macroura extends from June to February, and individual males (both wild- caught and laboratory-reared) are capable of breeding over extended periods during the breeding season, and for up to three seasons, in the laboratory. Gross and histological changes in the reproductive organs and endocrine changes in relation to reproductive activity have been investigated. Males do not appear to reach sexual maturity until the season following that in which they were born, although spermatorrhoea may commence in the season of birth. Testis and epididymis weight of these males, which commence spermatorrhoea late in the season, approximates that of sexually mature males early in the season but androgen levels and the weight of the accessory glands are low in all males except during the early months of the season. The age at which spermatorrhoea commences ranges from 141 to 350 days. The minimum scrota1 width at which it commences is 7.9 mm and the minimum body weight, 14.0 g. The onset of spermatorrhoea is not a function of age or season and in S. macroura should be used with caution as an indicator of impending sexual maturity. Maximum corticosteroid- binding capacity (MCBC) generally exceeded corticosteroid concentration and no androgen-related fall in MCBC was evident.
Tesi sul tema "Marsupialia Reproduction"
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Chapman, Jamie. "The marsupial zona pellucida : its structure and glycoconjugate content". Title page, abstract and contents only, 2003. http://web4.library.adelaide.edu.au/theses/09PH/09phc4661.pdf.
Testo completoAbstract (sommario):
Bibliography: leaves 262-298. This thesis investigated the structure and glycoconjugate composition of the zona pellucida (ZP) surrounding marsupial oocytes and the changes that occur during ovarian development, following ovulation, and following cortical granule exocytosis. The glycoconjugates of the oviduct epithelial lining of the brushtail possum around the time of ovulation were also examined to determine if there was any contribution of the oviductal secretions to the post-ovulatory ZP.
2
Martins, Eduardo Guimarães. "Ecologia populacional e alimentar de Gracilinanus microtarsus (Marsupialia: Didelphidae)". [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/316225.
Testo completoAbstract (sommario):
Orientador: Sergio Furtado dos ReisTese (doutorado): Universidade Estadual de Campinas, Instituto de Biologia
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Resumo: Gracilinanus microtarsus (Marsupialia: Didelphidae) é um pequeno marsupial de hábitos noturnos e arborícola que habita áreas de Mata Atlântica e Cerrado no Brasil. Os objetivos deste trabalho foram determinar a posição de G. microtarsus ao longo de duas dimensões ecológicas ? estratégia reprodutiva e dieta ? e definir níveis de agregação relevantes à dinâmica populacional da espécie. O estudo foi realizado no período de agosto de 2000 a fevereiro de 2003 em uma área de cerradão localizada no município de Américo Brasiliense, São Paulo. Os dados foram obtidos de indivíduos capturados em uma grade de captura de 3.600 m2. No total, foram capturados 91 indivíduos de G. microtarsus. Os resultados mostraram que os machos apresentam altas taxas de mortalidade após o início do período reprodutivo, indicando que G. microtarsus é melhor descrito como semélparo parcial. Usando as estimativas de sobrevivência e dados adicionais sobre a biologia de G. microtarsus, foi construído um modelo de dinâmica populacional estocástico. Os resultados das simulações desse modelo estocástico mostraram que as probabilidades de quasi-extinção e de extinção de G. microtarsus são sensíveis ao número de indivíduos que sobrevivem à queimadas no cerradão. Quanto à dieta, os resultados mostraram que G. microtarsus é principalmente insetívoro e que sua dieta é significativamente influenciada pelo sexo, estação e recurso alimentar. Além disso, a dieta varia entre indivíduos e a variação interindividual também é influenciada pelo sexo e estação
Abstract: The gracile mouse opossum Gracilinanus microtarsus (Marsupialia: Didelphidae) is a small marsupial with nocturnal and arboreal habits that lives in the Atlantic Rainforest and forested areas of the Cerrado in Brazil. The objectives of this study were to determine the placement of G. microtarsus along two ecological scales, namely, reproductive strategy and diet, as well as to define levels of aggregation relevant to the dynamics of this species. This study was conducted from August 2000 to February 2003 in an area of cerradão located in Américo Brasiliense, São Paulo. Data were collected from individuals captured in a 3,600 m2 trapping grid. A total of 91 individual G. microtarsus was captured. The results showed that males have high mortality rates after the beginning of the mating period, which suggests that G. microtarsus is best described as partially semelparous. Using survival estimates and additional data on the biology of G. microtarsus, it was constructed a stochastic population dynamic model. The results of the simulations showed that quasi-extinction and extinction probabilities of G. microtarsus are sensitive to the number of individuals that survive fires in the cerradão. As for the diet, the results showed that G. microtarsus is primarily insectivorous and that its diet is significantly affected by sex, season, and food resource. Furthermore, diet varies among individuals and the variation also is affected by sex and season
Doutorado
Ecologia
Doutor em Ecologia
3
Renfree, Marilyn B. "Marsupial reproduction and development". Thesis, Canberra, ACT : The Australian National University, 1988. http://hdl.handle.net/1885/142227.
Testo completo
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Miller, Emily Jane Biological Earth & Environmental Sciences Faculty of Science UNSW. "Conservation genetics and reproduction in three Australian marsupial species". Publisher:University of New South Wales. Biological, Earth & Environmental Sciences, 2008. http://handle.unsw.edu.au/1959.4/42779.
Testo completoAbstract (sommario):
Many Australian marsupial species require active population management to ensure their survival in the wild. Such management should be based on a sound understanding of species biology. This thesis explores how knowledge of reproduction and genetics can be applied to the management of three Australian marsupial species faced with contrasting management scenarios. The ??vulnerable?? greater bilby is the sole remaining desert bandicoot in Australia. They are a secretive, solitary species whose mating system is unclear. This research examined temporal changes in genetic diversity within two captive breeding programs utilising different management strategies. Using seven microsatellite loci, this study found the regular translocation of new individuals into the population maintained genetic diversity. Parentage analysis revealed the bilby to have a promiscious mating system. Sires and non-sires could not be distinguished by morphological traits. The tammar wallaby is a polygynous, solitary species that is threatened on mainland Australia, but overabundant on some offshore islands. The population genetics of tammars from the Abrolhos Islands in Western Australia were examined using nine autosomal and four Y-linked microsatellite loci, and mitochondrial DNA. There was a relationship between island size, population size and genetic diversity. The Abrolhos populations have significantly lower genetic diversity and are more inbred than mainland tammars and all sampled populations were significantly differentiated. The Abrolhos and mainland populations should be treated as separate Management Units. The eastern grey kangaroo is a gregarious, polygynous species that is often locally overabundant. To determine traits influencing male reproductive success, behavioural, morphological, physiological and genetic data were examined and showed dominance status, body size and testosterone concentrations were important factors. Sires were also significantly more heterozygous and genetically dissimilar to females, than non-sires. As body condition influences individual fitness, and management decisions; five body condition indices (BCI) calculated from morphological data were validated using serum biochemistry and haematology in two kangaroo populations with contrasting body condition. Blood parameters were found to be more reliable indicators of condition, questioning the credibility of BCIs currently used in management. These studies demonstrate the importance of reproductive and genetic data in assisting wildlife management, regardless of a species conservation status.
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Lloyd, Shan. "Reproduction in the musky rat-kangaroo, Hypsiprymnodon moschatus /". [St. Lucia, Qld.], 2006. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19206.pdf.
Testo completo
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Cilliers, Stephan Dirk. "The ram effect on the reproductive cycle of the springbok ewe (antidorcas marsupialis)". Diss., University of Pretoria, 1999. http://hdl.handle.net/2263/61736.
Testo completoAbstract (sommario):
Plasma progesterone concentrations were used as a measure to determine the "ram effect" on
nine cycling springbok ewes. Blood was collected biweekly, prior to and after ram
introduction. Ewes were subjected to the ram for a period of forty two days. Blood was
analysed for plasma progesterone by means of radioimmunoassays. No significant changes in
the plasma progesterone concentrations were detected. Superficially, a reduction in the
variation of the follicular phase of the ewes oestrous cycle was noted for before- to after ram
introduction. However, possibly because of a too small sample size, no statistical significance
was found. It is suggested that the "ram effect" on aseasonal cycling species may only have a
synchronisation effect (reduction in the variation of time between the follicular phase of
females) but more individuals should be used in future experiments to make any clear and
definite conclusions. Furthermore other hormones such as e.g. luteinizing hormone, which may
be less affected by translocation and handling stress, should also be used to determine the "ram
effect" on aseasonally breeding wild ungulates.Dissertation (MSc)--University of Pretoria, 1999.
Veterinary Wildlife Unit
MSc
Unrestricted
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Szdzuy, Kirsten. "Reproductive strategies of K-T-crossing theria neonate and postnatal development of the morphotype of Marsupialia and Placentalia (Mammalia)". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2006. http://dx.doi.org/10.18452/15483.
Testo completoAbstract (sommario):
Die Dissertation beschäftigt sich mit den möglichen Gründen für die divergente evolutionäre Entwicklung von Beuteltieren und plazentalen Säugetieren nach der Kreide/Tertiär-Grenze. Eine Erklärung könnten ihre unterschiedlichen Reproduktionsstrategien sein. Während die Beuteltiere sehr embryonale Jungtiere nach einer kurzen Tragzeit gebären, bringen Plazentalier deutlich weiter entwickelte Jungtiere nach einer relativ langen Tragzeit zur Welt. Die Aufrechterhaltung eines stabilen Metabolismus und thermoregulatorische Fähigkeiten der Jungtiere bieten einen großen Vorteil für die Anpassungsfähigkeit an ungünstige Umweltbedingungen, wie sie für die K/T-Grenze vermutet werden. Aus diesem Grund untersucht diese Studie den strukturelle Entwicklungsgrad der Lunge und die metabolischen Fähigkeiten von neonaten Marsupialia und Plazentalia. Histologische, ultrastrukturelle und kalorimetrische Untersuchungen erfolgten in einer integrativen Studie. Basierend auf den Ergebnissen wurde eine Grundplanrekonstruktionen der Neonaten von Marsupialia und Plazentalia durchgeführt. Als Vertreter für nesthockende Plazentalia wurde der Goldhamster (Mesocricetus auratus), die Moschusspitzmaus (Suncus murinus) und das Belangeri Spitzhörnchen (Tupaia belangeri) untersucht. Das Wildmeerschweinchen (Cavia aperea) und die Kurzohr-Elefantenspitzmaus (Macroscelides proboscideus) repräsentieren die nestflüchtenden Plazentalia. Als Marsupialia wurden die Hausspitzmaus-Beutelratte (Monodelphis domestica) und das Tammar-Wallaby (Macropus eugenii) untersucht. Die Ergebnisse bestätigen die starken Unterschiede im Entwicklungsgrad der Neonaten und in der postnatalen Entwicklung zwischen Marsupialia und Plazentalia. Die neonatalen Lungen von M. auratus und S. murinus befinden sich im späten “terminal air sac”-Stadium und weisen viele kleine Atemkammern von 50-80 µm Durchmesser auf. Die Alveolenbildung erfolgt bei M. auratus und S. murinus bereits im Alter von zwei beziehungsweise vier Tagen. Bei T. belangeri, C. aperea und M. proboscideus sind Alveolen bereits zum Zeitpunkt der Geburt vorhanden. Im Gegensatz dazu, befinden sich die Lungen der neonaten Beuteltiere M. domestica und M. eugenii im frühen “terminal air sac”-Stadium mit wenigen großen Atemkammern von 300-400 µm im Durchmesser. Die postnatale Lungenentwicklung erfolgt sehr langsam und die Alveolenbildung startet mit 28 Tagen bei M. domestica und mit 65 Tagen bei M. eugenii. Die Metabolismusmessungen ergaben, daß Marsupialia mit einer niedrigen Metabolismusrate geboren werden und den Adultmetabolismus erst spät in der postnatalen Entwicklung erreichen. Einhergehend mit der weit entwickelten Lungenstruktur weisen die Plazentalia hohe Metabolismusraten zur Geburt auf und erreichen den Adultmetabolismus innerhalb der ersten Lebenswoche. Die Ergebnisse zeigen, dass Jungtiere der Plazentalia, im Vergleich zu jungen Marsupialia, eine höhere Widerstandskraft gegen Umweltschwankungen haben, was als ein evolutiver Vorteil der Reproduktionsstrategie der Plazentalia unter ungünstigen Klimabedingungen interpretiert werden kann.This project deals with the possible reasons for the evolutionary differentiation between marsupial and placental mammals after the K/T-event. One explanation could be their different reproductive patterns. Marsupialia bear virtually embryonic young after a brief gestation period. In contrast, many eutherians bear anatomically advanced, highly precocious young after a relatively long gestation period. A stable metabolism and thermoregulatory abilities of the young are considered to offer a large adaptive advantage in a changing environment, how it is presumed for the K/T-boundary. Therefore this study determines the developmental stage and the respiratory efficiency of the lungs of marsupial and placental young. Histological, ultrastructural and calorimetric investigations were carried out in an integrated study and from the results morphotype reconstructions of the marsupial and placental neonates were carried out. As representatives for altricial Placentalia, the Golden hamster (Mesocricetus auratus), the Musk shrew (Suncus murinus), and the Belanger’s tree shrew (Tupaia belangeri) were examined. Furthermore the Guinea pig (Cavia aperea) and Short-eared elephant shrew (Macroscelides proboscideus) as typical precocial Placentalia were included. The Marsupialia were represented by the Grey short-tailed opossum (Monodelphis domestica) and the Tammar wallaby (Macropus eugenii). The results confirm clear differences in the developmental degree of the neonates and the postnatal development between marsupial and placental mammals. The newborn lungs of the altricially born placentals M. auratus and S. murinus are at the late terminal air sac stage with numerous small air sacs of 50 - 80 µm in diameter. Alveoli are formed shortly after birth at the age of 2 days in M. auratus and at the age of 4 days in S. murinus. In T. belangeri and in the precocially born C. aperea alveoli are already present at birth. In contrast, the lungs of the newborn marsupials M. domestica and M. eugenii are at the early terminal air sac stage with few large air sacs of 300 – 400 µm in diameter. The postnatal lung development proceeds very slowly in marsupials and alveoli are not present before the age of 28 days in M. domestica and 65 days in M. eugenii. The metabolic investigations demonstrate that Marsupialia have a low metabolism at birth and achieve the adult metabolism late in the postnatal development. All examined Placentalia showed the same pattern of oxygen consumption. Corresponding to their advanced differentiation of the lungs they also exhibit high metabolic abilities at birth and reach the adult metabolism during the first week of life. During this critical period placental young have a higher resistance against certain environmental stresses than marsupial young and this could mean an evolutionary advantage of the placental “reproductive strategy” under suboptimal climatic conditions.
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Veitch, Colleen Evelyn. "Aspects of female reproduction in the marsupials, the brushtail possum, Trichosurus vulpecula and the northern brown bandicoot, Isoodon macrourus /". [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19371.pdf.
Testo completo
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GUILLEMIN, MARIE-LAURE. "Structuration spatiale et strategies de reproduction chez deux marsupiaux didelphides de guyane (didelphis marsupialis et philander opossum) : relation avec la structuration genetique des populations". Paris 13, 2000. http://www.theses.fr/2000PA132025.
Testo completoAbstract (sommario):
Les resultats presentees dans cette etude sont basees a la fois sur des experiences de capture-recapture effectuees en guyane francaise, et sur l'utilisation de marqueurs genetiques (microsatellites et cytochrome b) chez deux especes de marsupiaux didelphides : didelphis marsupialis et philander opossum. Les didelphides representent une des composantes les plus importantes de la faune neotropicale. De plus, leur position systematique, au sein des mammiferes et egalement des marsupiaux, en fait des modeles d'etudes particulierement interessants car ils representent un modele original d'organisation mammalienne. Les domaines vitaux se chevauchent largement entre les individus, avec toutefois un recouvrement moindre entre femelles qu'entre males. Le renouvellement de la population est tres important, quasiment 100% en un an, pour les deux especes. Peu de jeunes marques dans les poches marsupiales sont recaptures une fois adultes sur la zone d'etude. Pour les deux especes il existe : une saisonnalite basee sur des disponibilites en nourriture et une strategie de reproduction de type r. Les marqueurs genetiques ont montre qu'il existait une reproduction de type polygyne chez p. Opossum. Il existe de plus, une importante tendance a la polyandrie chez p. Opossum et d. Marsupialis avec jusqu'a environ 30% et 50% de multiple paternite chez ces deux especes respectivement. Nos deux especes presentent une structuration de population avec une grande variabilite intra-population et une faible differentiation inter-population correlee a d'importants flux geniques. Les reconstructions phylogenetiques, effectuees tant sur les microsatellites que sur le cytochrome b, ont permis de mettre en evidence l'existence d'un clade guyanais et de souligner la particularite de la zone de cayenne. Cette region aurait pu etre isolee du continent au cours des transgressions marines passees, qui auraient separe les populations continentales et insulaires. Ces donnees montrent que ces deux especes, tres proches phylogenetiquement, presentent d'importantes similarites quant a leur organisation spatiale, leur strategie et mode de reproduction et leur genetique de population. Elles presentent egalement une des structures sociales les moins complexes parmi celles pouvant etre rencontrees chez les mammiferes.
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SILVA, Ana Carolina Bezerra. "Evolução do dimorfismo sexual e das estratégias bionômicas em marsupiais neotropicais (Didelphimorphia, Didelphidae)". Universidade Federal de Pernambuco, 2012. https://repositorio.ufpe.br/handle/123456789/19320.
Testo completoAbstract (sommario):
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A evolução do dimorfismo sexual de forma e tamanho do crânio e mandíbula foi estudada em 31 táxons de marsupiais didelfídeos, a fim de compreender melhor o desenvolvimento desse caráter na família. Para elucidar fatores que poderiam estar condicionando esse dimorfismo nos Didelphidae, foi analisada também a evolução de outros dois elementos: alometrias entre tamanho e forma do crânio e da mandíbula; e bionomia das mesmas 31 espécies. Foi realizado um mapeamento de todos estes caracteres, qualitativos e quantitativos, sobre uma filogenia da família, reconstruindo seus estados ancestrais utilizando métodos de parcimônia. Foram feitas também correlações utilizando contrastes independentes dos dados de dimorfismo sexual para auxiliar a esclarecer os padrões evolutivos do dimorfismo sexual. Tais correlações foram significativas, indicando coevolução entre os tipos de dimorfismo em ambas as estruturas estudadas. Não houve tendência unidirecional de surgimento/desaparecimento e aumento/decréscimo do dimorfismo nos Didelphidae. As reconstruções também indicaram coevolução entre os dimorfismos. Poucas espécies são altamente dimórficas e a maioria apresenta dimorfismo sexual de forma. Os resultados de alometrias entre os sexos foram iguais para crânio e mandíbula, mas elas também não apresentam padrão geral em direção à igualdade ou diferenciação das mesmas entre os sexos. Ambos os estados estão uniformemente distribuídos na filogenia. O comportamento das alometrias no crânio e na mandíbula coevoluiu, mas o padrão de alometrias entre os sexos não é conservado dentro de Didelphidae e não coevoluiu com o dimorfismo sexual, indicando que não explica a evolução deste caráter. Outros fatores, não-alométricos, devem condicionar este caráter nessa família. No entanto, apesar de padrões aparecem dentro de alguns clados, não há também evidência de coevolução entre bionomia e dimorfismo sexual nos Didelphidae. Espécies asazonais são poucas e não dimórficas de tamanho, talvez pelo fato de se reproduzirem continuamente e sofrerem menores pressões seletivas. A semelparidade é rara dentro de Didelphidae, surgindo apenas em Monodelphini e seguindo daí caminhos evolutivos distintos. Espécies semélparas exibem maiores tamanhos de ninhada nos Didelphidae por se reproduzirem uma única vez. Acredita-se que a seleção sexual direcione o padrão de dimorfismo sexual onde os machos são maiores que as fêmeas em espécies semélparas de Didelphidae. Portanto, nem alometrias nem bionomia, a princípio, explicam nem condicionam a evolução do dimorfismo sexual nos didelfídeos. A inclusão de uma maior quantidade de dados reprodutivos de marsupiais didelfídeos seria ideal para testar a veracidade da ausência de coevolução entre estratégias bionômicas e dimorfismo sexual. Associar dados ecológicos ou de padrões de distribuição poderiam ajudar a compreender melhor a evolução das estratégias bionômicas e a sua importância sobre a evolução do dimorfismo sexual nos Didelphidae.
The evolution of size and shape sexual dimorphism of the skull and mandible was studied in 31 taxa of didelphid marsupials, in order to better understand the development of this character in the family. And to elucidate factors that could be conditioning this dimorphism in Didelphidae the evolution of two other elements was also analyzed: allometries between size and shape of the skull and mandible and bionomy of the same 31 species. A mapping of all these qualitative and quantitative characters was carried through on a phylogeny of the family, reconstructing its ancestral states using parsimony methods. Correlations using independent contrasts of the sexual dimorphism data had been made also to assist clarifying the evolutionary standards of the sexual dimorphism. Such correlations were significant indicating coevolution among types of dimorphism in both studied structures. There is no unidirectional trend of sprouting/disappearance and increase/decrease of the dimorphism in Didelphidae. The reconstructions had also indicated coevolution among dimorphisms. Few species are highly dimorphics and the majority of them present shape sexual dimorphism. The results of allometries between the sexes had been the same for skull and mandible, but they also did not present a general pattern directing to the equality or differentiation between the sexes. Both states are uniformly distributed in the phylogeny. The results of the allometries in the skull and mandible coevoluted but the results of allometries between the sexes was not manteined in Didelphidae and they did not coevolute with sexual dimorphism indicating that they do not explain the evolution of this character and that other non-allometric factors must condition this character in this family. Although patterns appear inside of some clades there was no evidence of coevolution between bionomy and sexual dimorphism in Didelphidae. There are few aseasonal species and they are non-sized dimorphics perhaps by reproducing continuously and suffering less selective pressures. The semelparity is rare in Didelphidae arising only in Monodelphini and following from there distinct evolutionary ways. Semelparous species display the largest offspring size by reproducing only once. It is known that sexual selection directs the patterns of sexual dimorphism in those species in which males are larger than females in semelparous taxa of Didelphidae. Therefore neither allometries nor bionomy at first explain the evolution of sexual dimorphism in didelphids. The inclusion of a larger amount of reproductive data for didelphid marsupials would be ideal to test the veracity of the absence of coevolution among bionomic strategies and sexual dimorphism. The association of ecological data or distributional patterns could help in better understanding the evolution of the bionomic strategies and its importance on the evolution of the sexual dimorphism in Didelphidae.
Libri sul tema "Marsupialia Reproduction"
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Tyndale-Biscoe, Hugh. Reproductive physiology of marsupials. Cambridge: Cambridge University Press, 1987.
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Publishing, CSIRO, a cura di. Life of marsupials. Collingwood, Vic: CSIRO Publishing, 2005.
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Tyndale-Biscoe, C. H. Reproductive physiology of marsupials. Cambridge [Cambridgeshire]: Cambridge University Press, 1987.
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Sunquist, Melvin E. Reproductive strategies of female Didelphis. Gainesville: University of Florida, 1993.
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Tyndale-Biscoe, Hugh, e Marilyn Renfree. Reproductive Physiology of Marsupials. Cambridge University Press, 2010.
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Tyndale-Biscoe, Hugh, e Marilyn Renfree. Reproductive Physiology of Marsupials. Cambridge University Press, 2011.
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Jones, Menna, Chris Dickman e Mike Archer. Predators with Pouches. CSIRO Publishing, 2003. http://dx.doi.org/10.1071/9780643069862.
Testo completoAbstract (sommario):
Predators with Pouches provides a unique synthesis of current knowledge of the world’s carnivorous marsupials—from Patagonia to New Guinea and North America to Tasmania. Written by 63 experts in each field, the book covers a comprehensive range of disciplines including evolution and systematics, reproductive biology, physiology, ecology, behaviour and conservation.
Predators with Pouches reveals the relationships between the American didelphids and the Australian dasyurids, and explores the role of the marsupial fauna in the mammal community. It introduces the geologically oldest marsupials, from the Americas, and examines the fall from former diversity of the larger marsupial carnivores and their convergent evolution with placental forms.
The book covers all aspects of carnivorous marsupials, including interesting features of life history, their unique reproduction, the physiological basis for early senescence in semelparous dasyurids, sex ratio variation and juvenile dispersal. It looks at gradients in nutrition—from omnivory to insectivory to carnivory—as well as distributional ecology, social structure and conservation dilemmas.
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Mammals from pouches and eggs: Genetics, breeding, and evolution of marsupials and monotremes. [Canberra?]: CSIRO Australia, 1990.
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Vogelnest, Larry, e Rupert Woods, a cura di. Medicine of Australian Mammals. CSIRO Publishing, 2008. http://dx.doi.org/10.1071/9780643097971.
Testo completoAbstract (sommario):
In Medicine of Australian Mammals, more than 30 experts present the most current information available on the medical management of all taxa of Australian native mammals.
This comprehensive text is divided into two parts. The first includes chapters on general topics relevant to the medical management of captive and free-ranging Australian native mammals such as: veterinary considerations for the rescue, treatment, rehabilitation and release of wildlife; veterinary aspects of hand-rearing orphaned marsupials; marine mammal strandings and the role of the veterinarian; and wildlife health investigation and necropsy of Australian mammals. The second part covers the medicine of specific taxa of Australian native mammals. Detailed information on taxonomy, distribution, biology, anatomy, physiology, reproduction, husbandry, nutrition, physical and chemical restraint, clinical pathology, hand-rearing, diseases, zoonoses, therapeutics, reproductive management and surgery is included.
This practical, one-source reference is complemented by detailed photographs and illustrations, as well as tables listing reproductive and physiological data, diets, haematology and biochemistry values, and drug formularies. Appendices include a checklist of the mammals of Australia and its territories and a guide to the identification of common parasites of Australian mammals.
Medicine of Australian Mammals is clinically oriented and is a must-have for veterinary clinicians, no matter how experienced. The book will also be of use to veterinary students, researchers, biologists, zoologists, wildlife carers and other wildlife professionals.
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Coulson, Graeme, e Mark Eldridge, a cura di. Macropods. CSIRO Publishing, 2010. http://dx.doi.org/10.1071/9780643098183.
Testo completoAbstract (sommario):
This book covers the proceedings of a major 2006 symposium on macropods that brought together the many recent advances in the biology of this diverse group of marsupials, including research on some of the much neglected macropods such as
the antilopine wallaroo, the swamp wallaby and tree-kangaroos.
More than 80 authors have contributed 32 chapters, which are grouped into four themes: genetics, reproduction and development; morphology and physiology; ecology; and management.
The book examines such topics as embryonic development, immune function, molar progression and mesial drift, locomotory energetics, non-shivering thermogenesis, mycophagy, habitat preferences, population dynamics, juvenile mortality in drought,
harvesting, overabundant species, road-kills, fertility control, threatened species, cross-fostering, translocation and reintroduction. It also highlights the application of new techniques, from genomics to GIS.
Macropods is an important reference for academics and students, researchers in molecular and ecological sciences, wildlife and park managers, and naturalists.
Capitoli di libri sul tema "Marsupialia Reproduction"
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Rodger, John C. "Marsupials: Progress and Prospects". In Reproductive Sciences in Animal Conservation, 309–25. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-23633-5_11.
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Pask, Andrew J., e Marilyn B. Renfree. "Molecular Regulation of Marsupial Reproduction and Development". In Marsupial Genetics and Genomics, 285–316. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9023-2_14.
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Renfree, Marilyn B. "Endocrinology of Pregnancy, Parturition and Lactation in Marsupials". In Marshall’s Physiology of Reproduction, 677–766. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1286-4_7.
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Zangrandi, Priscilla L., e Emerson M. Vieira. "Semelparous Reproductive Strategy in New World Marsupials". In American and Australasian Marsupials, 1–29. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-88800-8_19-1.
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Harder, John D. "Reproductive Biology of South American Marsupials". In Reproductive Biology of South American Vertebrates, 211–28. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4612-2866-0_15.
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Johnston, Stephen D., e William V. Holt. "The Koala (Phascolarctos cinereus): A Case Study in the Development of Reproductive Technology in a Marsupial". In Reproductive Sciences in Animal Conservation, 171–203. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-0820-2_9.
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Renfree, Marilyn B., e Andrew J. Pask. "Reproductive and Developmental Manipulation of the Marsupial, the Tammar Wallaby Macropus eugenii". In Methods in Molecular Biology, 457–73. Totowa, NJ: Humana Press, 2011. http://dx.doi.org/10.1007/978-1-61779-210-6_18.
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Garcês, A., e I. Pires. "Chapter 9. Reproductive and Teratogenic Effects of Pesticides on Great Apes (Hominidae)". In Marsupial and Placental Mammal Species in Environmental Risk Assessment Strategies, 200–210. Cambridge: Royal Society of Chemistry, 2022. http://dx.doi.org/10.1039/9781839163470-00200.
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Johnston, Stephen D., e William V. Holt. "Using the Koala (Phascolarctos cinereus) as a Case Study to Illustrate the Development of Artificial Breeding Technology in Marsupials: an Update". In Reproductive Sciences in Animal Conservation, 327–62. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-23633-5_12.
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Kemp, T. S. "Living and fossil marsupials". In The Origin and Evolution of Mammals. Oxford University Press, 2004. http://dx.doi.org/10.1093/oso/9780198507604.003.0009.
Testo completoAbstract (sommario):
There are about 265 living species of marsupial mammals, the majority in Australasia, about 60 in South America, and a handful in Central and North America (Macdonald 2001). They are distinguishable from the placental mammals by many characters, but most profoundly by their mode of reproduction. Compared to the placentals, there is only a relatively brief intrauterine period, during which the embryo exchanges nutrients and gases with the mother via a simple, non-invasive yolk sac placenta. There is no development of the complex, highly invasive chorio-allantoic placenta found in the placentals with the partial exception of the bandicoots in which there is a small, short-lived, but true chorio-allantoic placenta. The marsupial neonate is born at a very immature stage, and most of the total maternal provision comes via lactation. In the majority of cases the young are carried in a pouch, although there are exceptions to this. Whether pouched or not, the young attach themselves continuously to the teat for an extended period of time. There has been much discussion about whether the marsupial mode of reproduction is ancestral to that of the placental mammals, or whether it represents an independent, parallel acquisition of viviparity. Lillegraven (1979), Lillegraven et al. (1987), and Szalay (1994), for example, regarded the marsupial mode as primitive and inefficient compared to the placental mode, and that it was failure of the marsupials to evolve a mechanism to prevent immunological rejection of the embryo by the mother that prevented any extension of the gestation period. Placentals, they argued, solved the problem by evolving the trophoblast layer of embryonic cells that performs the function of preventing the maternal antibodies from damaging the embryo. Conversely, several authors such as Parker (1977) have argued that the marsupial mode is an alternative, but equally well-adapted strategy of reproduction to that of placentals. It is one of low investment but low risk, and is therefore suitable for a more unpredictable environment. Tyndale-Biscoe and Renfree (1987) suggested that primitive marsupials and placentals had quite similar reproduction, with relatively immature neonates and a relatively long lactation period. Subsequent specialisation in the two groups went in different directions.