نتایج جستجو برای: reproductive allocation

تعداد نتایج: 175223  

2002
Brenda D. Kranz Tomohiro Shibata Koji Tsuchida Shuji Okajima Brenda Kranz

Researching the evolution and maintenance of reproductive mode (oviparity, ovoviviparity and viviparity) is important for identifying the intrinsic and environmental pressures associated with maternal care. We studied the life history, reproductive mode and sex allocation of Bactrothrips brevitubus, a haplodiploid, facultatively ovoviviparous Japanese thrips. Individual females can produce a ma...

2017
David R. Huff Tom Hsiang Ambika Chandra Yu Zhang

Here, we report the draft genome of Salmacisia buchloëana type strain OK1, a monotypic species of fungi that induces ovary development in genetic male plants and increases reproductive biomass allocation in its host buffalograss. This research will enhance our understanding of fungal manipulation of host development at the genomic level.

Journal: :The American naturalist 2003
Anne C Worley David Houle Spencer C H Barrett

Resource allocation within individuals may often be hierarchical, and this may have important effects on genetic correlations and on trait evolution. For example, organisms may divide energy between reproduction and somatic growth and then subdivide reproductive resources. Genetic variation in allocation to pathways early in such hierarchies (e.g., reproduction) can cause positive genetic corre...

Journal: :American journal of botany 2010
Hong Chen Sara Felker Shucun Sun

Angiosperm fruits typically consist of pericarp and seed, which collectively function to maximize plant reproductive success. Within-fruit reproductive allocation has been scarcely examined across a wide range of fruit types and taxa although it is critical to the understanding of the evolution of fruit size and seed size. We investigated seed size, fruit size, seed number per fruit (SNF), and ...

Journal: :Proceedings. Biological sciences 2012
Terézia Horváthová Shinichi Nakagawa Tobias Uller

Life-history theory predicts that individuals should adjust their reproductive effort according to the expected fitness returns on investment. Because sexually selected male traits should provide honest information about male genetic or phenotypic quality, females may invest more when paired with attractive males. However, there is substantial disagreement in the literature whether such differe...

Journal: :Integrative and comparative biology 2006
James D Thomson

The basic tenet of sex allocation theory is that an organism's reproductive success, through either male or female function, can be represented as a sex-specific, monotonic, increasing function of the organism's investment of resources in that function. The shapes of these curves determine what patterns of resource allocation can be evolutionarily stable. Although SA theory has stimulated creat...

Journal: :The American naturalist 2014
Vicencio Oostra Ana Rita A Mateus Karin R L van der Burg Thomas Piessens Marleen van Eijk Paul M Brakefield Patrícia Beldade Bas J Zwaan

The conditional expression of alternative life strategies is a widespread feature of animal life and a pivotal adaptation to life in seasonal environments. To optimally match suites of traits to seasonally changing ecological opportunities, animals living in seasonal environments need mechanisms linking information on environmental quality to resource allocation decisions. The butterfly Bicyclu...

2001
Elke Naumburg Laura E. DeWald Thomas E. Kolb

Recent increases in Pinus ponderosa Dougl. ex Laws. forest density in the southwestern United States have severely reduced understory herbaceous biomass and altered understory species composition. To examine whether changes in graminoid species composition are caused by increased shading, we studied the effects of shade on leaf gas exchange, biomass, and reproductive characteristics of five gra...

Journal: :Biology letters 2011
Yuuka Yamamoto Kenji Matsuura

In social insects, resource allocation is a key factor that influences colony survival and growth. Optimal allocation to queens and brood is essential for maximum colony productivity, requiring colony members to have information on the total reproductive power in colonies. However, the mechanisms regulating egg production relative to the current labour force for brood care remain poorly known. ...

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