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Social development and conflict in t...

Burns, Ian.

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Social development and conflict in the North American bumblebee Bombus impatiens Cresson.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Social development and conflict in the North American bumblebee Bombus impatiens Cresson./
Author:	Burns, Ian.
Description:	200 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-10, Section: B, page: 4956.
Contained By:	Dissertation Abstracts International65-10B.
Subject:	Biology, Entomology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3149400
ISBN:	0496087177

Social development and conflict in the North American bumblebee Bombus impatiens Cresson.
Burns, Ian.

Social development and conflict in the North American bumblebee Bombus impatiens Cresson. - 200 p.

Source: Dissertation Abstracts International, Volume: 65-10, Section: B, page: 4956.

Thesis (Ph.D.)--University of Minnesota, 2004.

Bumblebees are social insects, but the apparently cooperative relationship displayed between workers and queens is not a stable phenomenon. At some time in the colony cycle, cooperation breaks down, and conflict occurs, manifested in worker egg-laying, mutual egg eating, aggression, even in the death of the queen. Why this is so has long been a subject of study. Developments in greenhouse pollination by bumblebees have given the matter practical as well as theoretical implications.

ISBN: 0496087177Subjects--Topical Terms:

1018619
Biology, Entomology.

Social development and conflict in the North American bumblebee Bombus impatiens Cresson.
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100 1 $a Burns, Ian. $3 1905043
245 1 0 $a Social development and conflict in the North American bumblebee Bombus impatiens Cresson.
300 $a 200 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-10, Section: B, page: 4956.
500 $a Adviser: Marla Spivak.
502 $a Thesis (Ph.D.)--University of Minnesota, 2004.
520 $a Bumblebees are social insects, but the apparently cooperative relationship displayed between workers and queens is not a stable phenomenon. At some time in the colony cycle, cooperation breaks down, and conflict occurs, manifested in worker egg-laying, mutual egg eating, aggression, even in the death of the queen. Why this is so has long been a subject of study. Developments in greenhouse pollination by bumblebees have given the matter practical as well as theoretical implications.
520 $a Studies of one European species, Bombus terrestris, have suggested two principal explanatory hypotheses: (i) colony queens control worker reproductive behavior by pheromonal means, but lose their dominance over time, leading to conflict and worker egg-laying; (ii) workers cooperate with queens until they perceive it no longer in their kin-selected interests to do so, usually when eggs destined to be future reproductives, gynes or males, are developing in the colony.
520 $a I looked at free-flying and confined colonies of a North American species, Bombus impatiens, and found that, although conflict did occur in the species, there was not a distinct competition phase in colony development. The physical manifestations of conflict differed from those in B. terrestris. Workers resisted egg-laying by their mother but did not appear to lay eggs themselves while she remained healthy. There was greater aggression in free-flying colonies, associated with egg cells primed with pollen by workers.
520 $a Competition was not correlated temporally with colony production of reproductives, nor did worker behavior suggest that fading queen pheromones released conflict. The non-cooperative behaviors of B. impatiens workers did not appear to be responses to changes affected by or occurring within the queen.
520 $a Colonies produced gynes before males. The timing of male production was normally distributed throughout the season. Limiting the pollen supplied to half the confined colonies did not change these facts, though it delayed the production of reproductives. Colonies of B. impatiens did not exhibit the population growth phase followed by reproductive phase suggested as optimal for annual social insects.
520 $a I monitored overwintering gynes, and determined seasonal supercooling points. B. impatiens in the Twin Cities appeared at the northern edge of the species temperature tolerance range.
590 $a School code: 0130.
650 4 $a Biology, Entomology. $3 1018619
690 $a 0353
710 2 0 $a University of Minnesota. $3 676231
773 0 $t Dissertation Abstracts International $g 65-10B.
790 1 0 $a Spivak, Marla, $e advisor
790 $a 0130
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3149400