Home ranges and the value of spatial information

Spencer, Wayne D.

doi:10.1644/12-mamm-s-061.1

Cited by 133 publications

(134 citation statements)

References 133 publications

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“…A clear understanding of the mechanisms underlying this variability is important because both spatial and intergroup behaviours represent important determinants of mating system as well as of population density and growth rate (Lazaro-Perea 2001;Glessner & Britt 2005;Spencer 2012). …”

Section: Introductionmentioning

confidence: 99%

Territory exclusivity and intergroup encounters in the indris (Mammalia: Primates: Indridae: Indri indri) upon methodological tuning

Bonadonna

Torti

Sorrentino

et al. 2017

The European Zoological Journal

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Territorial, socially monogamous species actively defend their home range against conspecifics to maintain exclusive access to resources such as food or mates. Primates use scent marks and loud calls to signal territory occupancy and limit the risk of intergroup encounters, maximizing their energetic balance. Indri indri is a little-studied territorial, socially monogamous singing primate living in family groups. The groups announce territory occupancy with long-distance calls, and actively defend their territories from conspecific intruders. This work includes data collected in three forests in Madagascar on 16 indri groups over up to 5 years. We aimed (1) to estimate the extent of territories using minimum convex polygon (MCP), implementing minimum sampling effort requirements; (2) to quantify territorial exclusivity, measuring the overlap between territories; and (3) to evaluate the intergroup encounter rate and to quantify the dynamics of group encounters. Our results showed that indris range evenly within exclusive small territories with no or little overlap. Intergroup encounters are rare (0.05 encounters per day), and are located on the periphery of the territories. Disputes were mostly solved with vocal confrontation and only in 13% of the cases ended in physical fights. This frame underlines a cost-benefit explanation of territoriality, favouring a strategy that efficiently limits overlap and avoids costly intergroup encounters. We hypothesize that territorial behaviour in indri is related to mate-guarding strategy and that vocal behaviour plays a fundamental role in regulating intergroup spacing dynamics.

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Section: Introductionmentioning

confidence: 99%

Territory exclusivity and intergroup encounters in the indris (Mammalia: Primates: Indridae: Indri indri) upon methodological tuning

Bonadonna

Torti

Sorrentino

et al. 2017

The European Zoological Journal

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“…Caso de Estudio: Marina de Lujo en la Bahía de Puerto Jiménez: La información espacial detallada en párrafos anteriores tiene como elemento clave a resaltar que se deriva de la observación y registro de conductas, estas asociadas a un valor del "fitness" ecológico de cada especie en estudio, tal como se considera en Spencer (2012): en el caso del delfín nariz de botella, dicho valor es la ganancia energética por alimentación, mientras que para la ballena jorobada, son las probabilidades de cópula y reproducción. Un proyecto de la magnitud de una marina, que conlleva a una alteración ambiental abrupta, limitaría la accesibilidad a los recursos implícitos en el uso de área, afectando la obtención de energía de la población residente de delfines nariz de botella.…”

Section: Discussionunclassified

Análisis espacial de los hábitats críticos del delfín nariz de botella <i>(Tursiops truncatus)</i> y la ballena jorobada <i>(Megaptera novaeangliae)</i> en el Golfo Dulce, Costa Rica: Consideraciones acerca de un proyecto de construcción de marina

Herra-Miranda¹,

Pacheco-Polanco²,

Oviedo

et al. 2015

Rev. Mar. Cost.

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“…Within the geographic distribution range of the species, individual animals or groups commonly restrict their movements to bounded home ranges, and selectively occupy distinct habitats within these ranges (Spencer 2012). Different habitat features may be favored for different activities-places where animals are most secure from predation may differ from those where food is most readily available (Houston et al 1993).…”

Section: Introductionmentioning

confidence: 99%

Spatially nested niche partitioning between syntopic grazers at foraging arena scale within overlapping home ranges

2015

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Abstract. Niche separation among species with similar resource requirements can be expressed at various spatiotemporal scales, from the resource components selected at feeding sites to habitat and home range occupation and ultimately geographic distribution ranges. African large herbivores present a challenge to niche theory because multiple species commonly overlap both spatially and in vegetation components consumed. Aided by GPS telemetry, we investigated the space use patterns of two large grazers that are frequently associated in mixed-species aggregations. Specifically, we compared a generalist grazer with hindgut fermentation (plains zebra) with a similar-sized grazing ruminant (blue wildebeest) in west-central Kruger National Park, South Africa. We found that herds of the two species overlapped substantially in the home ranges that they occupied, but exploited spatially distinct foraging arenas for periods lasting several days or weeks within these ranges. Moreover, wildebeest and zebra differed in duration of settlement, extent of areas occupied during settlement, consequent exploitation intensity per unit area, proportion of time spent within foraging arenas relative to roaming interludes, and movement rates while within these arenas. In particular, wildebeest herds concentrated within small areas for prolonged periods, while zebra herds used more foraging arenas but exploited them for briefer periods. Both species overlapped substantially in habitat use, although wildebeest more strongly favored gabbro uplands and sodic sites presenting short grass lawns while zebra made greater use of areas with a taller grass cover. Hence resource partitioning was expressed mainly through behavioral distinctions in patch exploitation at foraging arena scale rather than in home range or habitat separation. Although zebra may have been partially excluded from the grasslands kept short by wildebeest, these sites formed only a small part of the wider ranges utilized by zebra, thereby restricting the competitive consequences. Hence spatially nested resource partitioning of this form contributes to the coexistence of these two grazers, and may be a mechanism enabling niche separation among other species.

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Home ranges and the value of spatial information

Cited by 133 publications

References 133 publications

Territory exclusivity and intergroup encounters in the indris (Mammalia: Primates: Indridae: Indri indri) upon methodological tuning

Territory exclusivity and intergroup encounters in the indris (Mammalia: Primates: Indridae: Indri indri) upon methodological tuning

Análisis espacial de los hábitats críticos del delfín nariz de botella <i>(Tursiops truncatus)</i> y la ballena jorobada <i>(Megaptera novaeangliae)</i> en el Golfo Dulce, Costa Rica: Consideraciones acerca de un proyecto de construcción de marina

Spatially nested niche partitioning between syntopic grazers at foraging arena scale within overlapping home ranges

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