Search results for "Reproductive season"

showing 3 items of 3 documents

A possible link between parasite defence and residual reproduction

2007

Life-history theory centres around trade-offs between current and future reproduction, but we have little understanding of how such trade-offs are mediated. We supplementary fed Ural owls (Strix uralensis) during the nestling period and quantified parents' current and future life-history components as well as their physiological health by monitoring haematocrit, leucocyte profile, intra- and extracellular blood parasites. Feeding led to reduced parental effort but did not improve offspring viability, male parasite defence, or parental survival. Intracellular leucocytozoan infection was reduced in fed females which lasted to the following year's reproductive season (carry-over effect), when …

0106 biological sciencesLeucocytozoonOffspringmedia_common.quotation_subjectZoologyReproductive season010603 evolutionary biology01 natural sciencesNesting BehaviorAnimalsParasite hostingBlood parasitesProtozoan Infections AnimalEcology Evolution Behavior and Systematicsmedia_commonbiologyEcologyReproduction010604 marine biology & hydrobiologyHaematozoaEukaryotaStrigiformesbiology.organism_classificationAnimal Nutritional Physiological PhenomenaFemaleReproductionJournal of Evolutionary Biology
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Seabirds mated for life migrate separately to the same places: behavioural coordination or shared proximate causes?

2015

Long-term pair bonds occur in diverse animal taxa, but they are most common in birds, and can last from a few years to a lifetime. In many of these species, after the reproductive season, birds migrate to distant nonbreeding grounds where they remain for several months, and until recently, little was known about whether partners maintain contact during migration. This gap in knowledge was primarily due to past methodological difficulties in tracking long-term, large-scale movements of individuals. However, the development of new animal-borne geolocation devices has enabled researchers to track movements of individuals for a year or more. We tracked the annual migrations of both members of b…

Global location sensorGLS loggerCalonectris diomedeapartner coordinationbiologyEcologyBehavioural strategycarryover effectinbreedingbehavioural strategy; carryover effects; global location sensor; GLS logger; inbreeding; mate fidelity; movement ecology; partner coordinationbiology.organism_classificationReproductive seasonEcology Evolution Behavior and SystematicBehavioural strategy; Carryover effects; Global location sensor; GLS logger; Inbreeding; Mate fidelity; Movement ecology; Partner coordination; Ecology Evolution Behavior and Systematics; Animal Science and ZoologyMovement ecologyGeolocationSettore AGR/11 - Entomologia Generale E ApplicataGeographyNatal homingMate fidelityAnimal Science and ZoologyInbreedingEcology Evolution Behavior and Systematics
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Sperm kinematic characterization of alpaca ( Vicugna pacos L.) during the reproductive season

2018

Semen analysis is a key factor when determining the fertility ability in males. South American camelids, and in particular the alpaca, have been studied very little when compared with other farm animals. The aim of this work was to perform the kinematic characterization of alpaca spermatozoa collected directly from the deferent duct by using CASA-Mot (Computer Assisted Semen Analysis for Motility) technology. Samples were obtained every three days throughout the reproductive season during two periods and with a break of seven days in the middle. During both periods, the quality of the sample's motility and kinematics increased over the first two days and then subsequently decreased. This pa…

Malemedicine.medical_treatmentmedia_common.quotation_subjectFertilitySemen analysisReproductive seasonVicugna pacos03 medical and health sciences0302 clinical medicineEndocrinologyAnimal sciencemedicinebiology.domesticated_animalAnimalsSperm motilityInsemination Artificialmedia_common030219 obstetrics & reproductive medicinemedicine.diagnostic_testbiologyArtificial inseminationReproduction0402 animal and dairy science04 agricultural and veterinary sciences040201 dairy & animal scienceSpermSpermatozoaEvery Three DaysBiomechanical PhenomenaSemen AnalysisAnimal Science and ZoologySeasonsCamelids New WorldBiotechnologyReproduction in Domestic Animals
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