Search results for "EFS"

Rekomendācijas aizsargājamās jūras teritorijas "Rīgas līča rietumu piekraste" monitoringa metožu uzlabošanai

2021

Akmeņu sēkļi ir svarīgi jūras vides bioloģiskās daudzveidības un kvalitātes nodrošināšanai – tie ir mājvieta gan daudzām sēdošām un peldošām bentisko jūras dzīvnieku un aļģu sugām, gan nozīmīga nārsta vieta zivju sugām. Dažādu abiotisko faktoru ietekmē akmeņu sēkļos nereti veidojas mikrobiotopi vai atšķirīgi biotopu kompleksi, kas savas mozaīkveida struktūras, kā arī mainīgā dziļuma dēļ apgrūtina šo aizsargājamo jūras biotopu monitoringu. Šo apgrūtinājumu dēļ nepieciešams uzlabot monitoringa metožu efektivitāti un rekomendēt tādas monitoringa metodes, kas pietiekami atspoguļotu teritorijas bioloģisko daudzveidību. Galvenās rekomendācijas monitoringa uzlabošanai, būtu veikt monitoringu staci…

Latvijas Valsts Universitātes Zinātniskie Raksti. 7. sējums. Ģeogrāfijas zinātnes. 1. laidiens

1956

“Your ride has arrived” – Exploring the nexus between subjective well-being, socio-cultural beliefs, COVID-19, and the sharing economy

2021

This study aimed to identify and explain different facets of the sharing economy and to differentiate between micro- and macro-mobility services. We also aimed to examine the correlation between the sharing economy and subjective well-being, cultural beliefs, and COVID-19. An exploratory research technique with face-to-face semi-structured interviews was used to collect data from a sample of 22 rideshare app users in a developing country between January and May 2020 and in July 2020. The data were analyzed using the NVivo 12 application. The major findings suggest that, considering their scope and use, sharing economy technology and services can be divided into four major domains: (1) hospi…

Risk-benefit in food safety and nutrition - outcome of the 2019 Parma Summer School

2021

Risk-benefit assessment is the comparison of the risk of a situation to its related benefits, i.e. a comparison of scenarios estimating the overall health impact. The risk–benefit analysis paradigm mirrors the classical risk analysis one: risk–benefit assessment goes hand-in-hand with risk–benefit management and risk–benefit communication. The various health effects associated with food consumption, together with the increasing demand for advice on healthy and safe diets, have led to the development of different research disciplines in food safety and nutrition. In this sense, there is a clear need for a holistic approach, including and comparing all of the relevant health risks and benefit…

THE DEVELOPMENT OF ADOLESCENTS’ SELF-CONCEPT OF ABILITY THROUGH GRADES 7-9 AND THE ROLE OF PARENTAL BELIEFS

2016

This study examined the development of adolescents’ self-concept of ability in mathematics and literacy during secondary school, and the role that mothers’ and fathers’ beliefs concerning their child’s abilities play in this development. Also examined was whether the role of mothers’ and fathers’ beliefs about their adolescent child’s ability in mathematics and literacy differs according to the adolescent’s gender and level of performance. A total of 231 adolescents and their mothers and fathers were followed up across secondary school. The results showed, first, that adolescents’ self-concept of ability declined slightly from grade 7 to grade 9 in both mathematics and literacy. Second, mot…

The Status of Coastal Benthic Ecosystems in the Mediterranean Sea: Evidence From Ecological Indicators

2020

The Mediterranean Sea is subject to multiple human pressures increasingly threatening its unique biodiversity. Spatially explicit information on the ecological status of marine ecosystems is therefore key to an effective maritime spatial planning and management, and to help the achievement of environmental targets. Here, we summarized scientific data on the ecological status of a selection of marine ecosystems based on a set of ecological indicators in more than 700 sites of the Mediterranean Sea. For Posidonia oceanica seagrass beds, rocky intertidal fringe, and coastal soft bottoms, more than 70% of investigated sites exhibited good to high ecological conditions. In contrast, about two-th…

Assessing vermetid reefs as indicators of past sea levels in the Mediterranean

2020

Abstract The endemic Mediterranean reef building vermetid gastropods Dendropoma petraeum complex (Dendropoma spp) and Vermetus triquetrus develop bio-constructions (rims) on rocky shorelines at about Mean Sea Level (MSL) and are therefore commonly used as relative sea-level (RSL) markers. In this study, we use elevations and age data of vermetid reefs to (1) re-assess the vertical uncertainties of these biological RSL indicators, and (2) evaluate the vertical growth rates along a Mediterranean east-west transect, in attempt to explain the differences found in both growth rates and uncertainties. In Israel, Differential Global Positioning System (DGPS) and laser measurements relative to the …

Feeding behaviour of Ophidiaster ophidianus (Lmk.) (Asteroidea) in Mediterranean rocky reefs

2017

The thermophilic Atlanto-Mediterranean purple starfish, Ophidiaster ophidianus, is a species protected under the EU’s Habitats Directive which is expanding its distribution in the northern Mediterranean areas as a consequence of global worming. The ecology of the species is largely unknown, specially for the diet. To cover this gap, the feeding habits of O. ophidianus have been studied in two different Mediterranean rocky reef areas: the southern Tyrrhenian Sea (Ustica Island, sampled in 2009) and the eastern Adriatic Sea (Molunat, sampled in 2014) by both field observations and ?13C and ?15N stable isotope analysis (SIA). SCUBA divers collected data by turning adult starfish downside-up an…

Crostacei Anfipodi associati ai reef di Sabellaria alveolata (Annelida: Sabellariidae) del Canale di Sicilia (Mar Mediterraneo)

2015

We describe diversity and patterns of spatial distribution of the amphipod fauna associated with reefs of the polychaete Sabellaria alveolata (L.) in the Sicily Strait. Samples were collected in June 2013, at three localities. Amphipod assemblages appeared homogeneous in the study area with variability increasing with decreasing spatial scale of observation. Jassa ocia (Bate) and Gammaropsis ulrici Krapp-Schickel & Myers characterized the studied assemblages.

Temporal dynamic of biofilms enhances the settlement of the central-1 Mediterranean reef2 builder Dendropoma cristatum (Biondi, 1859)

2021

Research on marine invertebrate settlement provides baseline knowledge for restoration technique implementation, especially for biogenic engineers with limited dispersion ability. Previously, we determined that the maturity of a biofilm strongly enhances the settlement of the vermetid reef-builder Dendropoma cristatum . In order to elucidate which biofilm features support a higher settlement of this species, we analyse the structure and composition of a marine biofilm over time, through microscopic observations, eukaryotic and prokaryotic fingerprinting analyses and 16S rDNA Illumina sequencing. The vermetid settlement temporal increase matched with the higher biofilm extent on the substrat…