Invasive acacias differ from native dune species in the hyperspectral/biochemical trait space

2018 ◽  
Vol 29 (2) ◽  
pp. 325-335 ◽  
Author(s):  
André Große-Stoltenberg ◽  
Christine Hellmann ◽  
Jan Thiele ◽  
Jens Oldeland ◽  
Christiane Werner
Keyword(s):  
Biochemical Trait ◽  
Trait Space

scholarly journals An index for measuring functional extension and evenness in trait space

2021 ◽  
Author(s):  
Tao Zhang ◽  
Grant M. Domke ◽  
Matthew B. Russell ◽  
Jeremy W. Lichstein
Keyword(s):  
Functional Extension ◽  
Trait Space

scholarly journals Selection of Pairings Reaching Evenly Across the Data (SPREAD): A simple algorithm to design maximally informative fully crossed mating experiments

2014 ◽  
Author(s):  
Kolea Zimmerman ◽  
Daniel Levitis ◽  
Ethan Addicott ◽  
Anne Pringle
Keyword(s):  
Nearest Neighbor ◽  
Simple Algorithm ◽  
Two Dimensional ◽  
Neighbor Distance ◽  
Crossing Experiments ◽  
The Mean ◽  
Parameter Values ◽  
Selection Of ◽  
Novel Algorithm ◽  
Trait Space

We present a novel algorithm for the design of crossing experiments. The algorithm identifies a set of individuals (a ?crossing-set?) from a larger pool of potential crossing-sets by maximizing the diversity of traits of interest, for example, maximizing the range of genetic and geographic distances between individuals included in the crossing-set. To calculate diversity, we use the mean nearest neighbor distance of crosses plotted in trait space. We implement our algorithm on a real dataset ofNeurospora crassastrains, using the genetic and geographic distances between potential crosses as a two-dimensional trait space. In simulated mating experiments, crossing-sets selected by our algorithm provide better estimates of underlying parameter values than randomly chosen crossing-sets.

scholarly journals Revisiting the hierarchical structure of the 24 VIA character strengths: Three global dimensions may suffice to capture their essence

2021 ◽  
Author(s):  
Melanie Viola Partsch ◽  
Matthias Bluemke ◽  
Clemens M. Lechner
Keyword(s):  
Character Strengths ◽  
Self Regulation ◽  
Analytic Solutions ◽  
Character Trait ◽  
Analytic Structure ◽  
Levels Of Abstraction ◽  
Total N ◽  
Factor Analytic ◽  
The Hierarchical Structure ◽  
Trait Space

Peterson and Seligman's (2004) values-in-action (VIA) framework maps 24 character strengths onto six more abstract virtues through a theoretical classification. However, compared to other individual difference constructs, there is little consensus about the factor-analytic structure of the VIA trait space. Applying Horn’s parallel analysis, Goldberg’s Bass-ackwards approach, and cross-country congruency analysis, we scrutinize the factor-analytic solutions-hierarchy of the 24 VIA strengths with the aim to identify one or more useful global levels of abstraction (akin to the Big Five, HEXACO/Big Six, or personality metatraits). We assessed the 24 character strengths with the psychometrically refined IPIP-VIA-R inventory in two large and heterogeneous samples from Germany and UK (total N ≈ 2,000). Results suggested that three global dimensions suffice to capture the essence of character strengths: Level III recovered more than 50% of the total variation of the 24 character strengths in well-interpretable, global/general, cross-culturally replicable dimensions. We provisionally labeled them positivity, dependability, and mastery. Their superordinate Level-II-dimensions were reminiscent of the “Big Two” personality metatraits Dynamism and Social Self-Regulation. Our results advance the understanding of the VIA character trait space and may serve as a basis for developing scales to assess these global dimensions.

scholarly journals New insights from multidimensional trait space responses to competition in two clonal plant species

2018 ◽  
Vol 33 (2) ◽  
pp. 297-307 ◽  
Author(s):  
Anne‐Kristel Bittebiere ◽  
Hugo Saiz ◽  
Cendrine Mony
Keyword(s):  
Plant Species ◽  
Clonal Plant ◽  
Trait Space

scholarly journals Ecological and evolutionary dynamics of interconnectedness and modularity

2018 ◽  
Vol 115 (4) ◽  
pp. 750-755 ◽  
Author(s):  
Jan M. Nordbotten ◽  
Simon A. Levin ◽  
Eörs Szathmáry ◽  
Nils C. Stenseth
Keyword(s):  
Population Dynamics ◽  
Natural Selection ◽  
Evolution Equation ◽  
Evolutionary Dynamics ◽  
Population Distribution ◽  
Theoretical Framework ◽  
Ecological System ◽  
Macro Level ◽  
Population Distributions ◽  
Trait Space

In this contribution, we develop a theoretical framework for linking microprocesses (i.e., population dynamics and evolution through natural selection) with macrophenomena (such as interconnectedness and modularity within an ecological system). This is achieved by developing a measure of interconnectedness for population distributions defined on a trait space (generalizing the notion of modularity on graphs), in combination with an evolution equation for the population distribution. With this contribution, we provide a platform for understanding under what environmental, ecological, and evolutionary conditions ecosystems evolve toward being more or less modular. A major contribution of this work is that we are able to decompose the overall driver of changes at the macro level (such as interconnectedness) into three components: (i) ecologically driven change, (ii) evolutionarily driven change, and (iii) environmentally driven change.

scholarly journals The evolution of traits and functions in herbivorous coral reef fishes through space and time

2019 ◽  
Vol 286 (1897) ◽  
pp. 20182672 ◽  
Author(s):  
Alexandre C. Siqueira ◽  
David R. Bellwood ◽  
Peter F. Cowman
Keyword(s):  
Coral Reefs ◽  
Fish Assemblages ◽  
Reef Fishes ◽  
Ecosystem Functions ◽  
Ecological Framework ◽  
Functional Composition ◽  
Ecological Process ◽  
Wide Range ◽  
The World ◽  
Trait Space

Herbivory by fishes has been identified as a key ecological process shaping coral reefs through time. Although taxonomically limited, herbivorous reef fishes display a wide range of traits, which results in varied ecosystem functions on reefs around the world. Yet, we understand little about how these trait combinations and functions in ecosystems changed through time and across biogeographic realms. Here, we used fossils and phylogenies in a functional ecological framework to reveal temporal changes in nominally herbivorous fish assemblages among oceanic basins in both trait space and lineage richness among functions. We show that the trait space occupied by extant herbivorous fishes in the Indo-Pacific resulted from an expansion of traits from the ancestral Tethyan assemblages. By contrast, trait space in the Atlantic is the result of lineage turnover, with relatively recent colonization by lineages that arose in the east Tethys/Indo-Pacific. From an ecosystem function perspective, the Atlantic supports a depauperate fauna, with few extant herbivorous reef fish lineages performing each function. Indo-Pacific fishes support both more functions and more lineages within each function, with a marked Miocene to Pleistocene expansion. These disparities highlight the importance of history in explaining global variation in fish functional composition on coral reefs.

scholarly journals Context-dependent functional dispersion across similar ranges of trait space covered by intertidal rocky shore communities

2017 ◽  
Vol 7 (6) ◽  
pp. 1882-1891 ◽  
Author(s):  
Nelson Valdivia ◽  
Viviana Segovia-Rivera ◽  
Eliseo Fica ◽  
César C. Bonta ◽  
Moisés A. Aguilera ◽  
...  
Keyword(s):  
Rocky Shore ◽  
Intertidal Rocky Shore ◽  
Context Dependent ◽  
Functional Dispersion ◽  
Rocky Shore Communities ◽  
Trait Space
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