scholarly journals Time budgets and habitat use of White-naped Cranes Grus vipio in the Ulz river valley, north-eastern Mongolia during the breeding season

2007 ◽  
Vol 17 (3) ◽  
pp. 259-271 ◽  
Author(s):  
Ute Bradter ◽  
Sundev Gombobaatar ◽  
Chuluunbaatar Uuganbayar ◽  
Tracy E. Grazia ◽  
Klaus-Michael Exo
Keyword(s):  
Reproductive Success ◽  
Nest Site ◽  
Negative Impact ◽  
Habitat Conservation ◽  
Vulnerable Species ◽  
Time Budgets ◽  
Resting Behaviour ◽  
North Eastern ◽  
Daylight Period ◽  
Eastern Mongolia

AbstractHabitat loss and degradation are critical threats for the globally threatened White-naped Crane Grus vipio. We estimated the size of the area used per day and the time budgets of parental and non-parental White-naped Crane pairs in north-eastern Mongolia during 2000 and 2001. Six parental crane pairs used an area of 11–155 ha per day. The maximum distance of a focal parental crane from the roosting-site was 3,030 m. Habitat conservation measures for breeding White-naped Cranes need to be targeted to within at least 3 km of the roosting-site or nest-site. Parental cranes spent 79.6 ± 4.8% of the daylight period foraging and had reduced preening and resting behaviour to 4.4 ± 1.9%. Pairs without juveniles showed a pronounced period of resting and preening behaviour during midday, which was absent in parental cranes. This indicates that parental cranes may be time-stressed. We conclude that increases in feeding-related activities (e.g. caused by a decrease in food availability) are likely to be at the expense of parental vigilance. Conversely, increases in vigilance (due to e.g. increased disturbance) may have a negative impact on feeding-related activities. Both increases can potentially negatively affect reproductive success in this Vulnerable species.

scholarly journals Reproductive performance and nest-site selection of White-naped Cranes Grus vipio in the Ulz river valley, north-eastern Mongolia

2005 ◽  
Vol 15 (4) ◽  
pp. 313-326 ◽  
Author(s):  
UTE BRADTER ◽  
SUNDEV GOMBOBAATAR ◽  
CHULUUNBAATAR UUGANBAYAR ◽  
TRACY E. GRAZIA ◽  
KLAUS-MICHAEL EXO
Keyword(s):  
Reproductive Performance ◽  
Nest Site ◽  
Grazing Intensity ◽  
Nest Site Selection ◽  
Livestock Grazing ◽  
Water Bodies ◽  
Nest Sites ◽  
North Eastern ◽  
Selection Of ◽  
Eastern Mongolia

North-eastern Mongolia is an important breeding area for the globally threatened White-naped Crane Grus vipio. We studied reproductive performance and the influence of factors related to livestock grazing on reproduction and nest-site selection of the White-naped Crane population in the Ulz river valley, north-eastern Mongolia in 2000 and 2001. In 2001, 42 territorial pairs were found in 270 km of river basin. Recruitment was 18–22% resulting in 0.5–0.6 juveniles per territorial pair. The years 2000 and 2001 were within a dry period and recruitment might have been below the long-term average. White-naped Crane nests were significantly associated with river basin sections containing shallow water-bodies. The number and extent of shallow water-bodies are likely to be a limiting factor for breeding population size. Nest-sites in water-bodies were selected for high nest concealment, but nests were initiated even when concealing vegetation was not available. Only 26% of nests were >90% concealed suggesting that appropriate cover was often not available. Nest-sites were also selected for low grazing intensity. No correlation was found between hatching or fledging success and nest concealment or grazing intensity. Brood-size of successful pairs was higher if the home range was ungrazed, but further investigations are needed to clarify whether this was caused by absence of livestock grazing or other factors. Both because of internationally important numbers and because of a potentially high reproductive output, the study area is of high importance for the species.

Association of Weather and Nest-Site Structure with Reproductive Success in California Spotted Owls

2000 ◽  
Vol 64 (3) ◽  
pp. 797 ◽  
Author(s):  
Malcolm North ◽  
George Steger ◽  
Renee Denton ◽  
Gary Eberlein ◽  
Tom Munton ◽  
...  
Keyword(s):  
Reproductive Success ◽  
Nest Site ◽  
Site Structure ◽  
Spotted Owls

A survey for piroplasmids in horses and Bactrian camels in North-Eastern Mongolia

2011 ◽  
Vol 179 (1-3) ◽  
pp. 246-249 ◽  
Author(s):  
Michal Sloboda ◽  
Milan Jirků ◽  
Daniela Lukešová ◽  
Moneeb Qablan ◽  
Zayat Batsukh ◽  
...  
Keyword(s):  
North Eastern ◽  
Bactrian Camels ◽  
Eastern Mongolia

scholarly journals First assessment of habitat suitability and connectivity for the golden jackal in north-eastern Italy

2020 ◽  
Vol 100 (6) ◽  
pp. 631-643
Author(s):  
Elisa Torretta ◽  
Olivia Dondina ◽  
Claudio Delfoco ◽  
Luca Riboldi ◽  
Valerio Orioli ◽  
...  
Keyword(s):  
Habitat Selection ◽  
Habitat Suitability ◽  
Negative Impact ◽  
Rapid Expansion ◽  
Golden Jackal ◽  
Landscape Resistance ◽  
Least Cost Path ◽  
Study Region ◽  
North Eastern ◽  
Kernel Approach

AbstractCompared with the rapid expansion across Europe, the golden jackal colonization of Italy is still limited and slow. No study focused on the habitat selection or landscape connectivity for this species was performed in Italy; thus, the potential distribution and dispersal patterns in the country remain unknown. Our objectives were to evaluate the suitability of the Friuli-Venezia Giulia region (north-eastern Italy) for the golden jackal, as well as to identify the ecological corridors connecting the areas currently occupied by the species. Corridors modelling allowed us both to hypothesize the dispersal dynamics occurring in the study region and to identify possible obstacles to future range expansion. We surveyed golden jackal presence in two study areas, covering an area of 500 km2, from March 2017 to February 2018. Using collected data, we modelled the species home-range scale habitat suitability based on an ensemble modelling approach. Subsequently, a habitat suitability prediction at a finer scale was used to estimate landscape resistance, starting from which, we modelled dispersal corridors among areas currently occupied by the species using a factorial least cost path and a cumulative resistant kernel approach. Our results indicated a moderate potential for large parts of the study region to support the occurrence of golden jackal family groups, whose presence seems to be mainly driven by the presence of wide areas covered by broadleaved forests and shrublands and by the absence of wide intensive agricultural areas. The predicted connectivity networks showed that three main permeable corridors are likely to connect golden jackal occurrence areas within the study region, while all the other corridors are characterized by a very low path density. Both the habitat selection and connectivity analyses showed a strong negative impact of the intensive cultivated plain on species stable presence and movement providing critical information for the conservation of the golden jackal in Italy.

Nest Site Selection and Consequences for Reproductive Success of the Endangered Mariana Crow (Corvus kubaryi)

2011 ◽  
Vol 123 (2) ◽  
pp. 236-242 ◽  
Author(s):  
Renee Robinette Ha ◽  
John M. Morton ◽  
James C. Ha ◽  
Lainie Berry ◽  
Sheldon Plentovich
Keyword(s):  
Reproductive Success ◽  
Site Selection ◽  
Nest Site ◽  
Nest Site Selection

Nest-site selection in the barn swallow, Hirundo rustica: What predicts seasonal reproductive success?

2006 ◽  
Vol 84 (11) ◽  
pp. 1533-1539 ◽  
Author(s):  
Rebecca Jo Safran
Keyword(s):  
Reproductive Success ◽  
Site Selection ◽  
Nest Site ◽  
Individual Characteristics ◽  
Nest Site Selection ◽  
Hirundo Rustica ◽  
Barn Swallow ◽  
Nest Location ◽  
Nest Sites ◽  
Site Characteristics

Despite hundreds of studies, we know very little about the causes and fitness-related consequences of nest-site selection. For example, it is not typically known whether the rarely reported fitness consequences of site selection are the result of nest, individual, or nest-site variables or combinations of these factors. Reuse of previously constructed nest sites is a prevalent behavior in many animals and offers the opportunity to experimentally tease apart whether seasonal reproductive success is a function of nest, individual, or nest-site characteristics. I used observational and experimental data to test three hypotheses related to these factors in association with barn swallow ( Hirundo rustica L., 1758) nest reuse. While both nest and individual characteristics explain variation in seasonal reproductive success, nest location per se is not an important factor defining the outcome of nest-site selection. Whereas traits related to habitat and individual characteristics are likely confounded in correlational studies, my experiments demonstrate a causal relationship between seasonal reproductive success and aspects of the nest and individual, the latter explaining more variation in the model than nest characteristics. Knowledge of the relative roles of individual, nest, and nest-site attributes are important for understanding the causes and consequences of habitat selection behavior.

scholarly journals There goes the neighborhood: White-crowned Sparrow nest site selection and reproductive success as local density declines

The Condor ◽  
2018 ◽  
Vol 120 (1) ◽  
pp. 234-244 ◽  
Author(s):  
Elizabeth L. Porzig ◽  
Nathaniel E. Seavy ◽  
John M. Eadie ◽  
Thomas Gardali ◽  
Diana L. Humple ◽  
...  
Keyword(s):  
Reproductive Success ◽  
Site Selection ◽  
Nest Site ◽  
Local Density ◽  
Nest Site Selection

Marbled salamanders (Ambystoma opacum) choose low elevation nest sites when cover availability is controlled

2006 ◽  
Vol 27 (3) ◽  
pp. 359-364 ◽  
Author(s):  
David Scott ◽  
Dean Croshaw
Keyword(s):  
Reproductive Success ◽  
Reproductive Behavior ◽  
Site Selection ◽  
Nest Site ◽  
Local Environment ◽  
Breeding Site ◽  
Nest Site Selection ◽  
Growth And Survival ◽  
Nest Sites ◽  
Selective Forces

AbstractNest site selection is an important part of adult reproductive behavior because growth and survival of young are often affected by the local environment. In terrestrially nesting marbled salamanders, nest elevation is likely important to reproductive success because it is directly related to the time of hatching. We tested the hypothesis that females choose nest sites based on elevation and its correlates by controlling the availability of nesting cover, a potentially important factor in nest site selection which often covaries with elevation. Breeding adults were confined to field enclosures in which natural nesting cover had been removed and replaced with equal proportions of artificial cover in each of three elevation zones. In four enclosures that spanned from lowest to highest areas of a wetland breeding site, females used artificial nesting cover most frequently at low elevations. These results contrast with other studies in which intermediate elevations had highest nest densities, but are consistent with a conceptual model in which opposing selective forces result in locally adapted nest site selection.

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