The role of landmarks in territory maintenance by the black saddlebags dragonfly, Tramea lacerata

  title={The role of landmarks in territory maintenance by the black saddlebags dragonfly, Tramea lacerata},
  author={Jeffrey A. Lojewski and Paul V. Switzer},
  journal={Behavioral Ecology and Sociobiology},
Territoriality can reduce competition for resources, but territorial defense can be costly; therefore, any behavior that reduces territorial costs may increase the net benefit of territoriality. Some species will align their territory boundaries with conspicuous landmarks that may serve to reduce defense costs. Dragonflies, including black saddlebags (Tramea lacerata), defend territories at breeding sites, keeping rival males away to allow themselves access to females. We used three treatments… 

Body mass and territorial defence strategy affect the territory size of odonate species

It seems that an increase in a species’s body mass increases its territory size and may force the species to shift its territory defence strategy from a percher to a flier.

Dragonfly locomotion : ecology, form and function

It is demonstrated that biomechanics can provide important insights into ecological processes – in this case, that flight performance is an important limiting factor for range expansions, where other limitations are perhaps not present.

Divergence in Time Apportionments of Tongue Protraction and Retraction Phases for Feeding Honey Bee Drones and Workers

There is a dichotomy in nectar-feeding behavior between drones and workers, which may be caused by caste-related labor and environmental constraints, and the theoretically-optimal time apportionment ratios (TAR) are derived.

Institutions, natural selection(s), and religion

The Emergence and Evolution of Religion (EER, henceforth) is a welcome addition to the growing canon of evolutionary approaches to religion.

An Effect of Landmarks on Territory Shape in a Convict Cichlid

The results thus confirm the consistency of the observed behavior with the hypothesis that A. siquia designs its territory to make intruders easier to spot and lead to conjecture that moving the landmark proportionately closer to or further away from the nest would have yielded essentially the same outcome in this study.



Good fences make good neighbours: the role of landmarks in territory partitioning in the rose bitterling (Rhodeus ocellatus)

The presence of the territory-demarcating landmark significantly reduced both the frequency of territorial incursions by males into adjacent territories and the rate of territorial displays, suggesting that the cost of defence of a territory may be reduced by utilizing territory- Demarcating landmarks, in accordance with the predictions of theoretical models.

Effects of landmarks on territorial establishment

Abstract The period of territorial settlement is critical for territorial species, and the initial disputes to fix the boundaries can be energetically expensive. Territorial residents may be able to

The use of landmarks to define territorial boundaries

The use of natural landmarks as territorial boundaries may have evolved as a result of the reduced defensive costs that accrue to these boundaries, and defensive costs may not depend directly on territory size: territory owners may be able to reduce defensive costs by selecting sites with high tactical defensibility.

Space use in territorial amberwing dragonflies: are residents female maximizers or neighbor minimizers?

The results suggest that residents do adjust their space use in response to intrusions by conspecifics, that their adjustment depends on the type of Conspecific that intruded, and that residents may be using a simple decision rule such as "move away from male intrusions, move closer to female intrusions" to adjust their within-territory space use.

The adoption of landmarks for territorial boundaries

Spatial Learning in Dragonflies

Spatial learning is evident in dragonflies on a variety of spatial scales and males appear to become faithful to a territory site through localization, a process during which they explore the site and develop a spatial map of the location of the territory and its resources.

Mechanisms for the formation and maintenance of traditional night roost aggregations in a territorial damselfly

It is indicated that conspecific attraction and individual spatial memory together may be sufficient to explain, at a proximate level, the traditional night roost aggregations of this species.

Fighting behavior and prior residency advantage in the territorial dragonfly, Perithemis tenera

Results suggest that non-escalated interactions may occur when intruders are simply assessing the quality of the site, and thus the prior residency advantage, is probably a result of the intruder not challenging for ownership because the value of the territory is too low.


Many aggressive animals form territory mosaics marked by distinct boundaries. This paper describes an approach to modeling territory size and shape within mosaics based on boundary disputes among