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Trade-offs in the evolution of bumblebee colony and body size: a comparative analysis.

Cueva Del Castillo R, Sanabria-Urbán S, Serrano-Meneses MA - Ecol Evol (2015)

Bottom Line: Variation in colony size and body size may be explained by the costs and benefits associated with the evolutionary history of each species in a particular environment.We found a negative association between colony size and the rainiest trimester, and a positive association between the colony size and the warmest month of the year.Moreover, we found a negative relationship between colony size and body sizes of queens, workers, and males, suggesting potential trade-offs in the evolution of bumblebee colony and body size.

View Article: PubMed Central - PubMed

Affiliation: Lab. de Ecología; UBIPRO Universidad Nacional Autónoma de México FES Iztacala. A. P. 314 54090 Edo. México México.

ABSTRACT
Trade-offs between life-history traits - such as fecundity and survival - have been demonstrated in several studies. In eusocial insects, the number of organisms and their body sizes can affect the fitness of the colony. Large-than-average body sizes as well as more individuals can improve a colony's thermoregulation, foraging efficiency, and fecundity. However, in bumblebees, large colonies and large body sizes depend largely on high temperatures and a large amount of food resources. Bumblebee taxa can be found in temperate and tropical regions of the world and differ markedly in their colony sizes and body sizes. Variation in colony size and body size may be explained by the costs and benefits associated with the evolutionary history of each species in a particular environment. In this study, we explored the effect of temperature and precipitation (the latter was used as an indirect indicator of food availability) on the colony and body size of twenty-one bumblebee taxa. A comparative analysis controlling for phylogenetic effects as well as for the body size of queens, workers, and males in bumblebee taxa from temperate and tropical regions indicated that both temperature and precipitation affect colony and body size. We found a negative association between colony size and the rainiest trimester, and a positive association between the colony size and the warmest month of the year. In addition, male bumblebees tend to evolve larger body sizes in places where the rain occurs mostly in the summer and the overall temperature is warmer. Moreover, we found a negative relationship between colony size and body sizes of queens, workers, and males, suggesting potential trade-offs in the evolution of bumblebee colony and body size.

No MeSH data available.


Consensus tree topology of 21 bumblebee taxa (see Table 1) used in the study (see Methods). Bayesian posterior probability values are shown for each node. Black squares denote taxa from temperate habitats, whereas white squares denote taxa from tropical habitats. Branch lengths are available from Data S1.
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ece31659-fig-0001: Consensus tree topology of 21 bumblebee taxa (see Table 1) used in the study (see Methods). Bayesian posterior probability values are shown for each node. Black squares denote taxa from temperate habitats, whereas white squares denote taxa from tropical habitats. Branch lengths are available from Data S1.

Mentions: Bayesian inference of phylogenetic relationships among species was implemented in MrBayes (see. 3.1.2; Ronquist and Huelsenbeck 2003). Six independent analyses (runs) were carried out for the combined data set (8,000,000 generations, sampling trees every 1000 generations, four chains with mixed models and flat priors). All trees estimated prior to stationarity were discarded (burnin). A consensus tree (Fig. 1) was estimated from the six independent analyses in MrBayes. Before mixing the runs, we checked the convergence of their log‐likelihood values in Tracer 1.2 (Rambaut and Drummond 2003). With the exception of the positioning of B. morio and Bombus pullatus, the resulting phylogenetic tree was consistent with Cameron et al.'s (2007) tree. In our phylogenetic tree, B. morio appears more basal, compared to Cameron et al.'s (2007) tree. Similarly, B. pullatus appears relatively more basal, closer to Bombus pennsylvanicus than to Bombus transversalis (Fig. 1).


Trade-offs in the evolution of bumblebee colony and body size: a comparative analysis.

Cueva Del Castillo R, Sanabria-Urbán S, Serrano-Meneses MA - Ecol Evol (2015)

Consensus tree topology of 21 bumblebee taxa (see Table 1) used in the study (see Methods). Bayesian posterior probability values are shown for each node. Black squares denote taxa from temperate habitats, whereas white squares denote taxa from tropical habitats. Branch lengths are available from Data S1.
© Copyright Policy - creativeCommonsBy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4588658&req=5

ece31659-fig-0001: Consensus tree topology of 21 bumblebee taxa (see Table 1) used in the study (see Methods). Bayesian posterior probability values are shown for each node. Black squares denote taxa from temperate habitats, whereas white squares denote taxa from tropical habitats. Branch lengths are available from Data S1.
Mentions: Bayesian inference of phylogenetic relationships among species was implemented in MrBayes (see. 3.1.2; Ronquist and Huelsenbeck 2003). Six independent analyses (runs) were carried out for the combined data set (8,000,000 generations, sampling trees every 1000 generations, four chains with mixed models and flat priors). All trees estimated prior to stationarity were discarded (burnin). A consensus tree (Fig. 1) was estimated from the six independent analyses in MrBayes. Before mixing the runs, we checked the convergence of their log‐likelihood values in Tracer 1.2 (Rambaut and Drummond 2003). With the exception of the positioning of B. morio and Bombus pullatus, the resulting phylogenetic tree was consistent with Cameron et al.'s (2007) tree. In our phylogenetic tree, B. morio appears more basal, compared to Cameron et al.'s (2007) tree. Similarly, B. pullatus appears relatively more basal, closer to Bombus pennsylvanicus than to Bombus transversalis (Fig. 1).

Bottom Line: Variation in colony size and body size may be explained by the costs and benefits associated with the evolutionary history of each species in a particular environment.We found a negative association between colony size and the rainiest trimester, and a positive association between the colony size and the warmest month of the year.Moreover, we found a negative relationship between colony size and body sizes of queens, workers, and males, suggesting potential trade-offs in the evolution of bumblebee colony and body size.

View Article: PubMed Central - PubMed

Affiliation: Lab. de Ecología; UBIPRO Universidad Nacional Autónoma de México FES Iztacala. A. P. 314 54090 Edo. México México.

ABSTRACT
Trade-offs between life-history traits - such as fecundity and survival - have been demonstrated in several studies. In eusocial insects, the number of organisms and their body sizes can affect the fitness of the colony. Large-than-average body sizes as well as more individuals can improve a colony's thermoregulation, foraging efficiency, and fecundity. However, in bumblebees, large colonies and large body sizes depend largely on high temperatures and a large amount of food resources. Bumblebee taxa can be found in temperate and tropical regions of the world and differ markedly in their colony sizes and body sizes. Variation in colony size and body size may be explained by the costs and benefits associated with the evolutionary history of each species in a particular environment. In this study, we explored the effect of temperature and precipitation (the latter was used as an indirect indicator of food availability) on the colony and body size of twenty-one bumblebee taxa. A comparative analysis controlling for phylogenetic effects as well as for the body size of queens, workers, and males in bumblebee taxa from temperate and tropical regions indicated that both temperature and precipitation affect colony and body size. We found a negative association between colony size and the rainiest trimester, and a positive association between the colony size and the warmest month of the year. In addition, male bumblebees tend to evolve larger body sizes in places where the rain occurs mostly in the summer and the overall temperature is warmer. Moreover, we found a negative relationship between colony size and body sizes of queens, workers, and males, suggesting potential trade-offs in the evolution of bumblebee colony and body size.

No MeSH data available.