Vigilance behavior of a tropical bird in response to indirect and direct cues of predation risk

AbstractAnimals use a variety of cues to evaluate their risk of predation when foraging, including direct cues of predator presence such as vocalizations or scent, and indirect cues, or environmental correlates of predation risk, such as vegetation structure. Research took place in a large-scale forest restoration experiment where habitat patches of different sizes were planted. I examined the effects of predator vocalizations (direct cues) on the vigilance behavior of Cherrie's Tanagers (Ramphocelus costaricensis) foraging in three different locations with varying amounts of vegetation cover (indirect cues): small patches and the centers and edges of large patches. Results show that the indirect cue of predation risk mediated birds' response to the direct cue. The increase in time birds spent alert in response to the predator call was significantly greater in the presumably riskier small patches and large patch edges compared to the relatively safe large patch centers. The increase in frequency of head-turns also was significantly greater in small patches compared to the large patch centers in response to the predator call. Although birds recognized the threat of the predator call and reacted by fleeing more quickly than after the non-predator call, this response did not differ between locations. Birds appeared to integrate information from both types of cues to evaluate their predation risk and determine their vigilance response. Individuals responded more strongly to the direct cue of predation risk when foraging in the presumably riskier smaller patches and large patch edges by increasing vigilance. These results highlight the importance of investigating behavioral responses to the characteristics of forest restoration sites, many of which consist of small patches of habitat.

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Bumblebees avoid flowers containing evidence of past predation events

Canadian Journal of Zoology ◽

10.1139/z06-117 ◽

2006 ◽

Vol 84 (9) ◽

pp. 1240-1247 ◽

Cited By ~ 40

Author(s):

K.R. Abbott

Keyword(s):

At Risk ◽

Predation Risk ◽

Field Experiments ◽

The Other ◽

Risk Of Predation ◽

Series Of Experiments ◽

Indirect Cues ◽

Artificial Flowers ◽

Ambush Predators

Bees are at risk of predation from flower-dwelling ambush predators. Since these predators tend to be cryptic, bees trying to mitigate predation risk may need to make use of indirect cues of the predator’s presence. For example, they may use cues of past predation events as indirect cues of current predation risk. I conducted a series of experiments that examined how bumblebees (genus Bombus Latreille, 1802) respond to cues of past predation events. In two field experiments, I found that wild rose (genus Rosa L.) flowers containing a freshly killed bumblebee, or the scent of a freshly killed bumblebee, received fewer bumblebee visits than control flowers. To test the possibility that bumblebees in the first two experiments were avoiding cues of competition risk rather than cues of predation risk, captive-reared bumblebees were given a choice between two artificial flowers — one containing a freeze-killed bumblebee (relatively more similar to a live foraging bee) and the other containing a crush-killed bumblebee (relatively more similar to a bee killed by a predator). Most bumblebees chose the flower containing the freeze-killed bee, supporting the hypothesis that the bumblebees in the first two experiments were attempting to avoid predation.

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Stand Stability of Pure and Mixed-Eucalyptus Forests of Different Tree Species in a Typhoon-Prone Area

Forests ◽

10.3390/f12040458 ◽

2021 ◽

Vol 12 (4) ◽

pp. 458

Author(s):

Haiyan Deng ◽

Linlin Shen ◽

Jiaqi Yang ◽

Xiaoyong Mo

Keyword(s):

Tree Species ◽

Forest Restoration ◽

Large Scale ◽

Stand Structure ◽

Pinus Elliottii ◽

Stem Form ◽

Tree Species Composition ◽

Eucalyptus Plantation ◽

Mixed Plantation ◽

Preservation Rate

Background and Objectives: The stable stand structure of mixed plantations is the basis of giving full play to forest ecological function and benefit. However, the monocultural Eucalyptus plantations with large-scale and successive planting that caused ecological problems such as reduced species diversity and loss of soil nutrients have presented to be unstable and vulnerable, especially in typhoon-prone areas. The objective of this study was to evaluate the nonspatial structure difference and the stand stability of pure and mixed-Eucalyptus forests, to find out the best mixed pattern of Eucalyptus forests with the most stability in typhoon-prone areas. Materials and Methods: In this study, we randomly investigated eight plots of 30 m × 30 m in pure and mixed-Eucalyptus (Eucalyptus urophylla S. T. Blake × E. grandis W. Hill) plantations of different tree species (Neolamarckia cadamba (Roxb.) Bosser, Acacia mangium Willd., and Pinus elliottii var. Elliottii Engelm. × P. caribaea Morelet) on growth status, characterized and compared the distribution of nonspatial structure of the monoculture and mixtures, and evaluated the stand quality and stability from eight indexes of the nonspatial structure, including preservation rate, stand density, height, diameter, stem form, degree of stem inclination, tree-species composition, and age structure. Results: Eucalyptus surviving in the mixed plantation of Eucalyptus and A. mangium (EA) and in the mixed plantation of Eucalyptus and P. elliottii × P. caribaea (EP) were 5.0% and 7.6% greater than those in pure Eucalyptus plantation (EE), respectively, while only the stand preservation rate of EA was greater (+2.9%) than that of the pure Eucalyptus plantation. The proportions of all mixtures in the height class greater than 7 m were fewer than that of EE. The proportions of EA and mixed plantation of Eucalyptus and N. cadamba (EN) in the diameter class greater than 7 m were 10.6% and 7.8%, respectively, more than that of EE. EN had the highest ratio of branching visibly (41.0%), EA had the highest ratio of inclined stems (8.1%), and EP had the most straight and complete stem form (68.7%). The stand stability of the mixed plantation of Eucalyptus and A. mangium presented to be optimal, as its subordinate function value (0.76) and state value (ω = 0.61) of real stand were the largest. Conclusions: A. mangium is a superior tree species to mix with Eucalyptus for a more stable stand structure in the early growth stage to approach an evident and immense stability and resistance, which is of great significance for the forest restoration of Eucalyptus in response to extreme climate and forest management.

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Grassy biomes: An inconvenient reality for large-scale forest restoration? A comment on the essay by Chazdon and Laestadius

American Journal of Botany ◽

10.3732/ajb.1600427 ◽

2017 ◽

Vol 104 (5) ◽

pp. 649-651 ◽

Cited By ~ 10

Author(s):

Joseph W. Veldman ◽

Fernando A. O. Silveira ◽

Forrest D. Fleischman ◽

Nataly L. Ascarrunz ◽

Giselda Durigan

Keyword(s):

Forest Restoration ◽

Large Scale

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Modification of 0+ perch foraging behaviour by indirect cues of predation risk

Ecology Of Freshwater Fish ◽

10.1111/j.1600-0633.2006.00139.x ◽

2006 ◽

Vol 15 (2) ◽

pp. 118-124 ◽

Cited By ~ 9

Author(s):

J. Wanzenbock ◽

V. N. Mikheev ◽

A. F. Pasternak

Keyword(s):

Predation Risk ◽

Foraging Behaviour ◽

Indirect Cues

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Do changes in reef habitats influence relative predation risk on the juvenile Australasian spiny lobster, Jasus edwardsii (Hutton, 1875)?

Crustaceana ◽

10.1163/15685403-00003447 ◽

2015 ◽

Vol 88 (7-8) ◽

pp. 839-856 ◽

Cited By ~ 4

Author(s):

J. Hesse ◽

J. A. Stanley ◽

A. G. Jeffs

Keyword(s):

Predation Risk ◽

Spatial Scales ◽

Spiny Lobster ◽

Habitat Type ◽

Small Spatial Scale ◽

Important Species ◽

Early Juvenile ◽

Risk Of Predation ◽

Jasus Edwardsii ◽

Commercially Important

Kelp habitats are in decline in many temperate coastal regions of the world due to climate change and expansion of populations of grazing urchins. The loss of kelp habitat may influence the vulnerability to predators of the juveniles of commercially important species. In this study relative predation rates for kelp versus barren reef habitat were measured for early juvenile Australasian spiny lobster, Jasus edwardsii (Hutton, 1875), on the northeastern coast of New Zealand using tethering methods. Variation in assemblages of predators over small spatial scales appeared to be more important for determining the relative predation of lobsters, regardless of habitat type. Therefore, the assessment of relative predation risk to early juvenile lobsters between kelp and barren habitats will require more extensive sampling at a small spatial scale, as well as a specific focus on sampling during crepuscular and nocturnal periods when these lobsters are most at risk of predation.

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Behavioural responses of voles to simulated risk of predation by a native and an alien mustelid: an odour manipulation experiment

Wildlife Research ◽

10.1071/wr08031 ◽

2010 ◽

Vol 37 (4) ◽

pp. 273 ◽

Cited By ~ 11

Author(s):

Karen Fey ◽

Peter B. Banks ◽

Hannu Ylönen ◽

Erkki Korpimäki

Keyword(s):

Baltic Sea ◽

Predation Risk ◽

Myodes Glareolus ◽

The Baltic Sea ◽

Short Term ◽

Behavioural Responses ◽

Alien Predator ◽

Risk Of Predation ◽

The Baltic ◽

The Impact

Context. Potential mammalian prey commonly use the odours of their co-evolved predators to manage their risks of predation. But when the risk comes from an unknown source of predation, odours might not be perceived as dangerous, and anti-predator responses may fail, except possibly if the alien predator is of the same archetype as a native predator. Aims. In the present study we examined anti-predator behavioural responses of voles from the outer archipelagos of the Baltic Sea, south-western Finland, where they have had no resident mammalian predators in recent history. Methods. We investigated responses of field voles (Microtus agrestis) to odours of native least weasels (Mustela nivalis) and a recently invading alien predator, the American mink (Mustela vison), in laboratory. We also studied the short-term responses of free-ranging field voles and bank voles (Myodes glareolus) to simulated predation risk by alien mink on small islands in the outer archipelago of the Baltic Sea. Key results. In the laboratory, voles avoided odour cues of native weasel but not of alien mink. It is possible that the response to mink is a context dependent learned response which could not be induced in the laboratory, whereas the response to weasel is innate. In the field, however, voles reduced activity during their normal peak-activity times at night as a response to simulated alien-mink predation risk. No other shifts in space use or activity in safer microhabitats or denser vegetation were apparent. Conclusions. Voles appeared to recognise alien minks as predators from their odours in the wild. However, reduction in activity is likely to be only a short-term immediate response to mink presence, which is augmented by longer-term strategies of habitat shift. Because alien mink still strongly suppresses vole dynamics despite these anti-predator responses, we suggest that behavioural naiveté may be the primary factor in the impact of an alien predator on native prey. Implications. Prey naiveté has long been considered as the root cause of the devastating impacts of alien predators, whereby native prey simply fail to recognise and respond to the novel predation risk. Our results reveal a more complex form of naiveté whereby native prey appeared to recognise alien predators as a threat but their response is ultimately inadequate. Thus, recognition alone is unlikely to afford protection for native prey from alien-predator impacts. Thus, management strategies that, for example, train prey in recognition of novel threats must induce effective responses if they are expected to succeed.

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Effect of Direct and Indirect Cues of Predation Risk on the Foraging Behavior of the White-Footed Mouse (Peromyscus leucopus)

Northeastern Naturalist ◽

10.1656/045.017.0102 ◽

2010 ◽

Vol 17 (1) ◽

pp. 19-28 ◽

Cited By ~ 10

Author(s):

Benjamin G. Fanson

Keyword(s):

Predation Risk ◽

Foraging Behavior ◽

Peromyscus Leucopus ◽

Indirect Cues ◽

White Footed Mouse

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Predation Risk by Gastronomic Boom - Case Peru

Journal of Landscape Ecology ◽

10.2478/jlecol-2018-0003 ◽

2018 ◽

Vol 11 (1) ◽

pp. 100-103

Author(s):

Aldo Alvarez-Risco ◽

Jaime Delgado-Zegarra ◽

Jaime A. Yáñez ◽

Santiago Diaz-Risco ◽

Shyla Del-Aguila-Arcentales

Keyword(s):

Natural Resources ◽

Predation Risk ◽

Environmental Sustainability ◽

Natural Sources ◽

Risk Of Predation ◽

Significant Damage

Abstract The growth of tourism to Peru and the gastronomic boom with millions of people looking to taste Peruvian food is resulting in a risk of predation of natural sources necessary to make these dishes. The focus in only obtaining these ingredients can generate significant damage to the Peruvian biodiversity, so stakeholders need to develop strategies to avoid predation due to the gastronomic boom. Citizens and visitors need to play a role in protecting the natural resources and contributing to environmental sustainability.

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