Results 31 to 40 of about 137,492 (222)

Qualitative geographical variation in interspecific interactions

open access: yesEcography, 2004
We explore geographical variation in the density relationship between potential competitor forest bird groups, resident Parus spp. and migrant Fringilla spp., across Europe using published bird census results.
Mikko Mönkkönen   +2 more
openaire   +1 more source

Variation in root morphology of epiphytic orchids along small-scale and large-scale moisture gradients [PDF]

open access: yesActa Botânica Brasílica
Root morphology is expected to respond to environmental conditions. Two earlier studies reported predictable changes in the structure of the velamen radicum (common in monocotyledons) along rainfall gradients, which was expected from its assumed role in ...
Helena J. R. Einzmann   +2 more
doaj   +2 more sources

Recombining your way out of trouble: the genetic architecture of hybrid fitness under environmental stress [PDF]

open access: yes, 2020
Hybridization between species is a fundamental evolutionary force that can both promote and delay adaptation. There is a deficit in our understanding of the genetic basis of hybrid fitness, especially in non-domesticated organisms.
Bendixsen, D.   +5 more
core   +1 more source

Effect of habitat degradation on competition, carrying capacity, and species assemblage stability [PDF]

open access: yes, 2017
In human-impacted rivers, nutrient pollution has the potential to disrupt biodiversity organisation and ecosystem functioning, prompting calls for effective monitoring and management.
Calizza, Edoardo   +3 more
core   +1 more source

Wing Shape in the Taxonomic Identification of Genera and Species of the Subfamily Dolichopodinae (Dolichopodidae, Diptera) [PDF]

open access: yesMongolian Journal of Biological Sciences, 2019
Characters of the wing morphology have significant importance in the systematics and taxonomy of the family Dolichopodidae, but there are only a few studies concerning the variation in wing shape of dolichopodid flies.
Mariya A. Chursina
doaj   +1 more source

Differences in wings may be sufficient to separate the sexes and two species of Gynaikothrips Zimmermann (Thysanoptera: Phlaeothripidae)?

open access: yesEntomoBrasilis, 2022
In this study, we use geometric morphometry to discriminate thrips of the species Gynaikothrips uzeli (Zimmerman) and Gynaikothrips ficorum (Marchal) and also to detect sexual dimorphism in these species. Two hundred individuals, one hundred females and
Priscila Paredes dos Santos   +2 more
doaj   +1 more source

Epigenetic consequences of interploidal hybridisation in synthetic and natural interspecific potato hybrids [PDF]

open access: yes, 2019
Interploidal hybridisation can generate changes in plant chromosome numbers, which might exert effects additional to the expected due to genome merger per se (i.e., genetic, epigenetic and phenotypic novelties).Wild potatoes are suitable to address this ...
Camadro, Elsa Lucila   +4 more
core   +1 more source

How self-regulation, the storage effect and their interaction contribute to coexistence in stochastic and seasonal environments [PDF]

open access: yes, 2019
Explaining coexistence in species-rich communities of primary producers remains a challenge for ecologists because of their likely competition for shared resources.
Barraquand, Frederic, Picoche, Coralie
core   +2 more sources

Lujiatun Psittacosaurids: understanding individual and taphonomic variation using 3D geometric morphometrics. [PDF]

open access: yesPLoS ONE, 2013
Psittacosaurus is one of the most abundant and speciose genera in the Dinosauria, with fifteen named species. The genus is geographically and temporally widespread with large sample sizes of several of the nominal species allowing detailed analysis of ...
Brandon P Hedrick, Peter Dodson
doaj   +1 more source

The Inheritance of Diagnostic Larval Traits for Interspecific Hybrids of \u3ci\u3ePapilio Canadensis\u3c/i\u3e and \u3ci\u3eP. Glaucus\u3c/i\u3e (Lepidoptera: Papilionidae) [PDF]

open access: yes, 2018
Traits distinguishing the closely related tiger swallowtail butterfly species, Papilio canadensis and P. glaucus, include fixed differences in diagnostic sex-linked and autosomal allozymes as well as sex-linked diapause regulation, and sex-linked ...
Scriber, J. Mark
core   +2 more sources

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