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Showing 1 to 20 of 279 for “"BREEDING SEASON"”.
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Energy budget and foraging behaviour of the Cape gannet Morus capensis during the breeding season
… of free-ranging Cape gannets Morus capensis breeding at Malgas Island, South Africa. I sought to determine the energy budget of family units and to extrapolate this to the whole population. Energy expenditure was measured using the doubly labelled water technique on adults and chicks. CO2 …
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BREEDING SEASON AVIAN COMMUNITY COMPOSITION AND PREY AVAILABILITY IN EUCALYPTUS AND SLASH PINE PLANTATIONS OF SOUTHWESTERN LOUISIANA
… as an indicator of prey availability for breeding birds in eucalyptus plantations. I compared these results to slash pine (<em>Pinus elliottii</em>) plantations of similar age and also of similar height in southwestern Louisiana during bird breeding seasons of 2014 and 2015. I also …
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Potential collision risk of harriers Circus spp. with wind turbines during breeding season derived from GPS tracking
… of 3 s), to investigate the collision risk of breeding male Montagu’s Harriers Circus pygargus (MoH; n = 24 individuals), Hen Harriers C. cyaneus (HH; n = 3) and Western Marsh-harriers C. aeruginosus (MaH; n = 3) in the Dutch-German border area. First, the relevant flight behaviour …
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Effect of the Duration of Progesterone Treatment on Synchronising Oestrus outside the Natural Breeding Season in Merino Ewes
… of South Africa Merino ewes during the spring breeding season. The study compared the effect of long and short-term progesterone treatment and its combination with or without equine chorionic gonadotropin on oestrous response and hormonal profiles. Seventy-six (76) Merino ewes aged between 2–5 …
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African penguin (Spheniscus demersus) distribution during the non-breeding season : preparation for, and recovery from, a moulting fast
… of the endangered African penguin during the non-breeding season. As foraging success during this period is critical to adult survival, this project explores their dispersal patterns, as well as the degree of overlap with commercial purse-seine fisheries which target the same prey. African …
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Tracking African penguins (Spheniscus demersus) outside of the breeding season: Regional effects and fishing pressure during the pre-moult period
… of knowledge regarding foraging areas when not breeding has been identified as a deficiency in management planning for African penguins. Satellite transmitters were deployed on 20 adults during the pre-moult foraging period from colonies on the west coast (Dassen Island, n=10) and south coast …
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Does the implementation of a closed fishing season during the breeding season benefit a species? : a per-recruit-based approach using Cymbula granatina as an illustration
Closed seasons are generally implemented on the presumption that they increase reproductive output of fished populations. This is based on the assumption that the imposition of a closed season during the breeding season allows more individuals to reproduce, as they are not being harvested. I …
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Does the implementation of a closed Fishing Season during the breeding Season benefit a Species? A per-recruit-based approach using Cymbula Granatina as an Illustration
Closed seasons are generally implemented on the presumption that they increase reproductive output of fished populations. This is.based on the assumption that the imposition of a closed season during the breed~· season allows more individuals to reproduce, as they are not being harvested.I …
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Rapid social regulation of 3β-HSD activity in the songbird brain
… with short-term aggressive challenges in many breeding vertebrates. However, some animals such as song sparrows (Melospiza melodia) are aggressive year-round, even during the non-breeding season, when gonads are regressed and systemic testosterone (T) levels are non-detectable. In contrast, …
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Post-breeding public information use in a ground-nesting songbird community
… fledgling vocalizations present during the post-breeding season are PI cues used by Veeries and other ground-nesting songbirds (i.e., Ovenbirds [Seiurus aurocapilla]) for territory establishment in subsequent breeding seasons. Moreover, I hypothesize that ground-nesters integrate multiple social …
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The movement and landscape use of Blue Cranes in the Western Cape
… and distance travelled throughout the day of breeding and non-breeding cranes to determine whether the breeding status/season influences their ranging behaviour. There was no significant difference of the home range size between breeding cranes and non-breeding cranes (p > 0.05). There was …
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Possible Role Of Breeding Phenology, Brood Size, And Male Parental Care On The Number Of Nesting Attempts By Female Eastern Bluebirds, A Facultatively Multibrooded Species
… attempt to raise two or more broods in a single breeding season. The results of previous studies have revealed much variation among species in the factors that influence the likelihood of female songbirds attempting to raise multiple broods during a breeding season. As such, additional studies …
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Relationships Between Winter Energetic Condition and Reproductive Investment in a Wild Bird
… studies often evaluate factors during breeding, but conditions outside of the breeding season may also play a role. These linkages across life history stages remain poorly understood, particularly at the mechanistic level. Using wild populations of black-capped chickadees (Poecile …
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Factors That Affect Harem Stability in a Feral Horse (Equus caballus) Population on Shackleford Banks island, NC
… Anecdotal evidence and an early study in the non-breeding season suggest that management of the Shackleford Banks island horses with immunocontraception reduces harem stability in the population, providing an opportunity to study the factors that influence harem stability. I investigated the …
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Habitat Selection and Sexual Suggestion of Rocky Mountain Bighorn Sheep in Custer State Park, South Dakota
… segregation occurs year-round except during the breeding season (November and December) when the sexes congregate on a traditional breeding range (cf. Geist 1971, p 209). These studies also have shown that the sexes remain separated during the winter, when segregation should be least likely. …
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Spring Dispersal and Breeding Ecology of Northern Bobwhite in Southwest Ohio
… gap in knowledge of spring dispersal, breeding ecology and behavior, and breeding vital rates of Midwestern bobwhites near the northern limit of their range. It is unclear if recovery of Midwestern bobwhite populations is limited by spring dispersal capabilities and/or breeding vital …
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Reproductive Endocrinology of the Ozark Hellbender, Cryptobranchus Alleganiensis Bishopi
Seasonal changes in steroid concentrations in the serum of adult Ozark hellbenders, Cryptobranchus alleganiensis bishopi, were investigated from June 1993 to December, 1993. These dates included the periods before, during and after the breeding season. Radioimmunoassays were performed to measure …
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The relationships between gonadotropin-releasing hormone, luteinizing hormone, and testosterone secretion in the male sheep
… examined in intact rams in May (during the non-breeding season), September (breeding season), and March (transition between breeding and non-breeding season). A very high coincidence between GnRH and LH pulses was observed in the ram across the season. Individual LH pulses in May and September …
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Investigations of delayed plumage maturation in the orchard oriole
… experiments to test predictions of alternative breeding season signaling hypotheses for DPM. I found that, contrary to the results of several previous studies, subadult plumage in the orchard oriole does not reduce intra-sexual aggression directed toward subadults during the breeding season. I …
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