Search results for "COMPETITION"

Outcomes of intraguild interactions between two egg parasitoids in field and semi-field conditions

2012

Intraguild interactions between two egg parasitoids, Trissolcus basalis (Wollaston) and Ooencyrtus telenomicida (Vassiliev) exploring egg masses of the Southern Green Stink Bug Nezara viridula (L.) were investigated in field and semi-field conditions. Field trials were conducted in tomato fields by using sentinel and naturally laid egg masses in 2010 and 2011. Egg parasitoids monitoring, by sentinel egg masses placed weekly on plants during the tomato growing season and recollected one week later, showed that T. basalis occurs from June to October, whereas O. telenomicida occurs mainly in July and August. In the same fields, collections of naturally laid egg masses display different types o…

Competition between algae and seagrasses: a Ruppia cirrhosa (Petagna) Grande bed in western Mediterranean Sea

2007

Stable isotope analysis of trophic niche in two co-occurring native and invasive terrapins, Emys orbicularis and Trachemys scripta elegans

2016

A trophic niche overlap in native and alien turtle species can lead to competitive interactions whereby allochthonous turtles may outcompete autochthonous individuals and eventually affect viability of natural populations. The European pond turtle (Emys orbicularis) is an autochthonous species threatened by habitat encroachment and competition with the red-eared slider (Trachemys scripta elegans). The latter is an invasive species introduced in Europe from midwestern United States as a pet and now widespread in the natural habitats of E. orbicularis. The extent of trophic competition between E. orbicularis and T. s. elegans in northern Italy was assessed by nitrogen and carbon stable isotop…

Food selection of a generalist herbivore exposed to native and alien seaweeds

2018

Understanding which factors influence the invasion of alien seaweed has become a central concern in ecology. Increasing evidence suggests that the feeding preferences of native herbivores influence the success of alien seaweeds in the new community. We investigated food selection of a generalist native grazer Paracentrotus lividus, in the presence of two alien seaweeds (Caulerpa cylindracea and Caulerpa taxifolia var. distichophylla) and two native seaweeds (Dictyopteris membranacea and Cystoseira compressa). Sea urchins were fed with six experimental food items: C. cylindracea, C. taxifolia var. distichophylla, a mixture of C. cylindracea and C. taxifolia var. distichophylla, D. membranace…

Characterization of mitotic chromosomes of four species of the genus Diplodus: Karyotypes and chromosomal nucleolar organizer region phenotypes

1996

Karyotypes have been described in four Mediterranean species of the genus Diplodus (Teleostei, Sparidae), D. vulgaris, D. puntazzo, D. sargus and D. annularis. Chromosomes were mainly acrocentric in all but D. vulgaris, where certain chromosome pairs were subtelocentric. A remarkable intraspecific heteromorphism in the number of NOR-bearing chromosomes along with a substantial interspecific variability in position of chromosomal Ag signals have been encountered. The presumed origin of multiple NOR-bearing chromosomes in Diplodus species and variation of the NOR location is discussed. ? 1996 The Fisheries Society of the British Isles

Enhancer, chromatin insulator, non-coding RNA and α-histone gene expression during embryogenesis of the sea urchin Paracentrotus lividus.

2009

Core promoters and chromatin insulators (ins) may direct a transcriptional enhancer (enh) to prefer a specific promoter in complex genetic loci. Enh and ins flank the sea urchin Paracentrotus lividus α-histone H2A transcription unit in a tandem repeated cluster containing the five histone genes. In vivo competition assays of enh and ins functions reveal that the H2A enh-bound MBF-1 activator participates also in the expression of the H3 gene and that the sns5 ins buffers the downstream H1 promoter from the H2A enh. These results suggest that both the H2A enh and the sns5 ins may account for the diverse accumulation of the linker vs core nucleosomal histones during early development of the s…

DIDATTICA E CONCORSI INTERNAZIONALI: OBIETTIVI, METODI ED ESPERIENZE

2018

La memoria presenta nell’ambito di un più ampio panorama europeo sulla questione delle metodologie per la didattica universitaria nelle scuole di Ingegneria ed Architettura, gli esiti di una collaborazione avviata nel 2005 tra il Politecnico di Milano – Polo Regionale di Lecco e l’Università degli Studi di Palermo che ha avuto come oggetto la partecipazione di docenti e studenti provenienti da Atenei Europei ed Asiatici ad un Concorso Internazionale di Progettazione Sostenibile. Le tematiche affrontate durante questo decennio di collaborazione sono state l’occasione per fornire un contributo al dibattito, attualmente in corso, nell’ambito dell’Ingegneria Edile-Architettura che, proprio in q…

Palermo University and Compasso Volante

2014

The University of Palermo joins since few years the Compasso Volante Competition, that is still keeping, in different ways, its original spirit. The city of Palermo has represented in two different Editions the project site and, last year, Palermo hosted for the second time the Award Ceremony. Palermo has been made available to the awarding of the XV Edition, thanks to the enthusiasm and pleasure that students and professors have shown in the past. The paper present the result of the Edition that has take place in Macau, Hong Kong, Milano and Palermo.

Demand for quality and design ideas competition: experimentation to discover good practices / Domanda di qualità e concorso di idee: una sperimentazi…

2013

La procedura del concorso d’idee è indicata come soluzione per contribuire all’innalzamento della qualità architettonica. In Italia le esperienze durante l’ultimo decennio sono state numerose, ma non sempre hanno sortito positivi esiti concreti. Se le procedure di richiamo internazionale si riferiscono a linee guida consolidate, per la maggior parte delle occasioni di rilievo locale il livello di attenzione è insufficiente a garantire una diffusa qualità dei risultati. La partecipazione ai lavori di una commissione giudicatrice è stata colta come occasione utile a sperimentare, fuori da ambiti accademici, un approccio improntato dalla cultura tecnologica della progettazione. Per quanto circ…

I concorsi del '68 per le nuove chiese a Palermo

2015

Negli anni Sessanta l’espansione di Palermo dal centro verso le periferie è già iniziata. Fin dai piani di ricostruzione all’indomani della guerra, la nascita dei quartieri di edilizia residenziale pubblica conferisce alla città un nuovo volto, cingendo interamente il nucleo antico e modificandone la crescita che, dal piano Regalmici, aveva visto nell’asse di via Libertà e quindi nella direzione nord la direzione preferenziale di sviluppo. La crescita pluridirezionale è accentuata dal Piano Regolatore del 1962, che individua da nord a sud otto macroaree di espansione lungo la traccia della nuova circonvallazione. Due concorsi aprono la nuova stagione dell’architettura religiosa a Palermo; i…