Annual movements of Mongolian gazelles: Nomads in the Eastern Steppe

Olson, Kirk A.; Fuller, Todd K.; Mueller, Thomas; Murray, Martyn G.; Nicolson, Craig; Odonkhuu, Daria; Bolortsetseg, Sanjaa; Schaller, George B.

doi:10.1016/j.jaridenv.2010.05.022

Cited by 40 publications

(48 citation statements)

References 51 publications

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“…1) with 156 records (including 79 records from field surveys) at 8×8 km. This treatment was reasonable and essential due to the wide range of P. gutturosa and their long distance nomadic movements (Olson et al 2010). …”

Section: Study Taxa and Distribution Datamentioning

confidence: 99%

“…Thus, three gazelles could occur within an approximately 250 km diameter circle surrounding Qinghai Lake. Because P. przewalskii is more closely related to P. gutturosa than to P. picticaudata (Jiang 2004), and P. gutturosa have long distance nomadic movements (Olson et al 2010), there could be sympatry and mixed-species groups for P. przewalskii and P. gutturosa, and even the opportunity for hybridization. Additionally, the potential sympatry for P. gutturosa and P. picticaudata suggests that they may have formed mixed groups and even hybridized in the past.…”

Section: Potential Sympatric Ranges For Procapramentioning

confidence: 99%

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Detecting the potential sympatric range and niche divergence between Asian endemic ungulates of Procapra

Jiang

2012

Naturwissenschaften

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Species distribution modeling (SDM) is increasingly used to reveal biogeographical relationships, for example the sympatric range for species coexistence, and fundamental questions about niche evolution between related species. We explored the sympatric ranges between three Procapra species (Procapra przewalskii, Procapra Picticaudata, and Procapra gutturosa) via two methods of defining the study region (method 1, in which models were developed in a larger region including the whole geographic range of Procapra, and method 2 in which a smaller region surrounding focal species' localities was used and then projected to the larger region). We also quantified environmental niche divergence between gazelles across the whole range in Procapra. Models for gazelles generally performed well. Compared with method 2, method 1 led to larger predicted areas with high suitability and was less concentrated around known localities. Clamping, which deals with variables outside the training range, varied between gazelles and occurred primarily in regions unsuitable for respective species. For all gazelle pairs, models revealed an overlap zone where more than one species should occur, while the estimates varied between the two methods. Moreover, we found that the niche overlap was closely associated with geographic distance but not with phylogenetic distance among gazelles. Our findings indicate that SDM is a useful tool for testing whether related species tend to be in sympatry at large scales, with method 1 leading to more realistic predictions for Procapra. This study provides evidence of a distinct niche divergence among related species and supports the theory that ecological speciation plays a significant role in lineage generation.

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Section: Study Taxa and Distribution Datamentioning

confidence: 99%

Section: Potential Sympatric Ranges For Procapramentioning

confidence: 99%

Detecting the potential sympatric range and niche divergence between Asian endemic ungulates of Procapra

Jiang

2012

Naturwissenschaften

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“…Populations of saiga (Saiga tartarica) migrate large distances over the Central Asian steppe along a latitudinal gradient of productivity determined by seasonal precipitation and frost (Singh et al 2010). Mongollian gazelle (Procapra gutturosa) also move in relation to latitudinal gradients of frost, but their movements tend be more variable than those of saiga, despite living in similar environments (Ito et al 2006, Olson et al 2010, Mueller et al 2011. Wildebeest (Connochaetes taurinus) in the Serengeti migrate over an opposing rainfall and soil fertility gradient (Holdo et al 2009b) where high soil fertility areas attract large herds during the wet season and high-rainfall areas are a refuge during the dry season (Pennycuick 1975, Maddock 1979, Boone et al 2006.…”

Section: Introductionmentioning

confidence: 99%

Competition, predation, and migration: individual choice patterns of Serengeti migrants captured by hierarchical models

Hopcraft

Morales

Beyer

et al. 2014

Ecological Monographs

106

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Abstract. Large-herbivore migrations occur across gradients of food quality or food abundance that are generally determined by underlying geographic patterns in rainfall, elevation, or latitude, in turn causing variation in the degree of interspecific competition and the exposure to predators. However, the role of top-down effects of predation as opposed to the bottom-up effects of competition for resources in shaping migrations is not well understood. We studied 30 GPS radio-collared wildebeest and zebra migrating seasonally in the Serengeti-Mara ecosystem to ask how predation and food availability differentially affect the individual movement patterns of these co-migrating species. A hierarchical analysis of movement trajectories (directions and distances) in relation to grass biomass, high-quality food patches, and predation risk show that wildebeest tend to move in response to food quality, with little attention to predation risk. In contrast, individual zebra movements reflect a balance between the risk of predation and the access to high-quality food of sufficient biomass. Our analysis shows how two migratory species move in response to different attributes of the same landscape. Counterintuitively and in contrast to most other animal movement studies, we find that both species move farther each day when resources are locally abundant than when they are scarce. During the wet season when the quality of grazing is at its peak, both wildebeest and zebra move the greatest distances and do not settle in localized areas to graze for extended periods. We propose that this punctuated movement in highquality patches is explained by density dependency, whereby large groups of competing individuals (up to 1.65 million grazers) rapidly deplete the localized grazing opportunities. These findings capture the roles of predation and competition in shaping animal migrations, which are often claimed but rarely measured.

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“…In most species, such co-occurrence is observed only for short periods of time (days), such as when the last phase of a given stage overlaps with the initiation of the following one. For example, some mammalian species overlap a portion of their final reproductive phase with migration, like Pacific walruses (Odobenus rosmarus divergens) (Garlich-Miller et al, 2011), plains zebras (Equus quagga) (Kahuranga and Silkiluwasha, 1997) or Mongolian gazelles (Procapra gutturosa) (Olson et al, 2010). In birds, the collared flycatcher (Ficedula hypoleuca) is a well-known example for frequently overlapping the end of the reproductive period with the beginning of feather molt (Hemborg, 1999;Hemborg et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Molt–breeding overlap alters molt dynamics and behavior in zebra finches,Taeniopygia guttata castanotis

Echeverry‐Galvis

Hau

2012

Journal of Experimental Biology

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SUMMARYCostly events in the life history cycle of organisms such as reproduction, migration and pelage/plumage replacement are typically separated in time to maximize their outcome. Such temporal separation is thought to be necessitated by energetical trade-offs, and mediated through physiological processes. However, certain species, such as tropical birds, are able to overlap two costly life history stages: reproduction and feather replacement. It has remained unclear how both events progress when they co-occur over extended periods of time. Here we determined the consequences and potential costs of such overlap by comparing molt and behavioral patterns in both sexes of captive zebra finches (Taeniopygia guttata castanotis) that were solely molting or were overlapping breeding and molt. Individuals overlapping the early stages of breeding with molt showed a roughly 40% decrease in the growth rate of individual feathers compared with birds that were molting but not breeding. Further, individuals that overlapped breeding and molt tended to molt fewer feathers simultaneously and exhibited longer intervals between shedding consecutive feathers on the tail or the same wing as well as delays in shedding corresponding flight feathers on opposite sides. Overlapping individuals also altered their time budgets: they devoted more than twice the time to feeding while halving the time spent for feather care in comparison to molt-only individuals. These data provide experimental support for the previously untested hypothesis that when molt and reproduction overlap in time, feather replacement will occur at a slower and less intense rate. There were no sex differences in any of the variables assessed, except for a tendency in females to decline body condition more strongly over time during the overlap than males. Our data indicate the existence of major consequences of overlapping breeding and molt, manifested in changes in both molt dynamics and time budgets of both sexes. It is likely that under harsher conditions in natural environments such consequences will be more severe and may result in fitness consequences.

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Annual movements of Mongolian gazelles: Nomads in the Eastern Steppe

Cited by 40 publications

References 51 publications

Detecting the potential sympatric range and niche divergence between Asian endemic ungulates of Procapra

Detecting the potential sympatric range and niche divergence between Asian endemic ungulates of Procapra

Competition, predation, and migration: individual choice patterns of Serengeti migrants captured by hierarchical models

Molt–breeding overlap alters molt dynamics and behavior in zebra finches,Taeniopygia guttata castanotis

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