Colonization of islands can dramatically influence the evolutionary trajectories of organisms, with both deterministic and stochastic processes driving adaptation and diversification. Some island colonists evolve extremely large or small body sizes, presumably in response to unique ecological circumstances present on islands. One example of this phenomenon, the Greater Antillean boas, includes both small (<90 cm) and large (4 m) species occurring on the Greater Antilles and Bahamas, with some islands supporting pairs or trios of...
Rapid reversal of a potentially constraining genetic covariance between leaf and flower traits in Silene latifoliaJanet Steven, Ingrid Anderson, Edmund Brodie & Lynda Delph
Genetic covariance between two traits generates correlated responses to selection, and may either enhance or constrain adaptation. Silene latifolia exhibits potentially constraining genetic covariance between specific leaf area and flower number in males. Flower number is likely to increase via fecundity selection but the correlated increase in specific leaf area increases mortality, and specific leaf area is under selection to decrease in dry habitats. We selected on trait combinations in two selection lines for four...
Extreme body elongation has occurred repeatedly in the evolutionary history of ray-finned fishes. Lengthening of the anterior-posterior body axis relative to depth and width can involve changes in the cranial skeleton and vertebral column, but to what extent is anatomical evolution determined by selective factors and intrinsic constraints that are shared broadly among closely related lineages? In this study, we fit adaptive (Ornstein-Uhlenbeck) evolutionary models to body shape and its anatomical determinants and identified two...
Data from: Body shape transformation along a shared axis of anatomical evolution in labyrinth fishes (Anabantoidei)David C. Collar, Michelle Quintero, Bernardo Buttler, Andrea B. Ward & Rita S. Mehta
Major morphological transformations, such as the evolution of elongate body shape in vertebrates, punctuate evolutionary history. A fundamental step in understanding the processes that give rise to such transformations is identification of the underlying anatomical changes. But as we demonstrate in this study, important insights can also be gained by comparing these changes to those that occur in ancestral and closely related lineages. In labyrinth fishes (Anabantoidei), rapid evolution of a highly derived torpedo-shaped body...
The ecological success of widespread species is attributed to an ability to generalize across diverse habitats, a so-called “jack of all trades” scenario. However, this assumption ignores the potential for local specialization, an alternative scenario whereby spatial variation in natural selection generates habitat-specific adaptive landscapes. Despite a growing recognition of spatial variation in selection in nature, and the inevitable exploitation of distinct habitat types across an extensive geographic range, attention to this hypothesis has been...
Seasonal variation in age, sex, and reproductive condition of Mexican free-tailed bats at a cave roost in eastern NevadaBryan Hamilton, Joseph Danielson, Jason Williams, Kelsey Ekholm & Rick Sherwin
In North America, Mexican free-tailed bats (Tadarida brasiliensis mexicana) consume vast numbers of insects. Mexican free-tailed bats have declined throughout their range due to historic guano mining, roost destruction, and bioaccumulation of organochlorine pesticides. Long distance migrations and dense congregations at roosts exacerbate these declines. Wind energy development further threatens bat communities worldwide and presents emerging challenges to Mexican free-tailed bat conservation. Effective mitigation of bat mortality at wind energy facilities requires baseline data on...
Christopher Newport University6
InterAmerican University of Puerto Rico1
University of Rhode Island1
University of Virginia1
Indiana University Bloomington1
University of California, Santa Cruz1
Vanderbilt University School of Medicine1
Nevada Department of Wildlife1