POPULAR AND PRACTICAL ENTOMOLOGY: Insect Food of the Black Bear (Ursus Americanus)

Bigelow, N. K.

doi:10.4039/ent5449-3

Can Entomol

1922

DOI: 10.4039/ent5449-3

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POPULAR AND PRACTICAL ENTOMOLOGY: Insect Food of the Black Bear (Ursus Americanus)

N. K. Bigelow

Abstract: During the sunltner of 1921 the writer of this article was studying the Plankton of Lake Nipigon, Ont., and collecting insects during his spare time. While searching for insects in the bush many opportunities were presented for observing the habits of wild life under natural conditions. Not the least interesting of these observations were those concerning the Black Bear (Ursus nwzmicanus) .

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Evolutionary and Ecological Pressures Shaping Social Wasps Collective Defenses

Detoni

Feás²,

Jeanne

et al. 2021

Annals of the Entomological Society of America

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Social insects are well known for their aggressive (stinging) responses to a nest disturbance. Still, colonies are attacked due to the high-protein brood cached in their nests. Social wasps have evolved a variety of defense mechanisms to exclude predators, including nest construction and coordinated stinging response. Which predatory pressures have shaped the defensive strategies displayed by social wasps to protect their colonies? We reviewed the literature and explored social media to compare direct and indirect (claims and inferences) evidence of predators attacking individuals and colonies of wasps. Individual foraging wasps are predominantly preyed upon by birds and other arthropods, whereas predators on wasp brood vary across subfamilies of Vespidae. Polistinae wasps are predominantly preyed upon by ants and Passeriformes birds, whereas Vespinae are predominantly preyed upon by badgers, bears, and hawks. Ants and hornets are the primary predators of Stenogastrinae colonies. The probability of predation by these five main Orders of predators varies across continents. However, biogeographical variation in prey–predator trends was best predicted by climate (temperate vs. tropical). In social wasps’ evolutionary history, when colonies were small, predation pressure likely came from small mammals, lizards, or birds. As colonies evolved larger size and larger rewards for predators, the increased predation pressure likely selected for more effective defensive responses. Today, primary predators of large wasp colonies seem to be highly adapted to resist or avoid aggressive nest defense, such as large birds and mammals (which were not yet present when eusociality evolved in wasps), and ants.

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Evolutionary and Ecological Pressures Shaping Social Wasps Collective Defenses

Detoni

Feás²,

Jeanne

et al. 2021

Annals of the Entomological Society of America

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show abstract

Black Bear Food Habits in Yosemite National Park

Graber¹,

White²

1983

Bears: Their Biology and Management

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POPULAR AND PRACTICAL ENTOMOLOGY: Insect Food of the Black Bear (Ursus Americanus)

Cited by 2 publications

References 0 publications

Evolutionary and Ecological Pressures Shaping Social Wasps Collective Defenses

Evolutionary and Ecological Pressures Shaping Social Wasps Collective Defenses

Black Bear Food Habits in Yosemite National Park

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