Recursos de colección

Aquatic Commons (37.409 recursos)

The Aquatic Commons is a thematic digital repository covering the natural marine, estuarine /brackish and fresh water environments . It includes all aspects of the science, technology, management and conservation of these environments, their organisms and resources, and the economic, sociological and legal aspects.

Subject = Biology

Mostrando recursos 1 - 20 de 25

  1. Plotosus lineatus

    Ketabi, Ramin; Jamili, Shahla
    The Striped Catfish can be recognized by its striped coloration, barbels around the mouth, and its body shape which tapers to a point posteriorly. Small juveniles are black and large adults may be less distinctly striped. Plotosus lineatus can reach a maximum length of 32 cm (13 in) and about 40cm in Persian Gulf. The body is brown with cream colored or white longitudinal bands. The most striking feature of this species is in the fins; in fact the second dorsal, caudal and anal are fused together as in eels. In the rest of the body is quite similar to...

  2. Lutjanus ehrenbergii

    Ketabi, Ramin; Jamili, Shahla
    Lutjanus ehrenbergii is known as Blackspot Snapper and Blackspot Snapper. L. ehrenbergii is widely distributed in the Indo West Pacific at depths ranging from 5 to 20 m. This reef associated species inhabits very shallow coastal habitats, often in large schools near freshwater run-offs. Adults inhabit coral reefs, while juveniles frequent inshore areas over sand, silt or coral rubble bottoms, occasionally in mangrove-lined streams and estuaries. This species may enter freshwater areas to consume small fish and invertebrates.This species reaches sexual maturity at approximately 2 years of age and reaches a maximum age of at least 11 years. Growth trajectories...

  3. Defence Cryptocentrus lutheri and Alpheus djiboutensis against Sea urchin

    Ketabi, Ramin; Jamili, Shahla

  4. Defence mantis (Neogonodacty lusoerstedii) against Sea star

    Ketabi, Ramin; Jamili, Shahla

  5. Torpedo sinuspersici

    Ketabi, Ramin; Jamili, Shahla
    Electric rays, thought to be the most primitive of the skates and rays, have stout tails but have rather expansive disc. This group is distinguished by the presence of powerful electric organs, derived from branchial muscles in head region. Torpedo sinuspersici found inshore in sandy bottoms, and well offshore from the surf zone down to 200 m. Also on or near coral reefs (like Kish Island in Persian Gulf). Common in shallow sandy areas. Occasionally hooked by anglers, more often seen by divers; can deliver a strong shock. Flesh is edible. T. sinuspersici can survive for hours after being stranded...

  6. Cheilinus lunulatus

    Ketabi, Ramin; Jamili, Shahla
    The Cheilinus lunulatus (broomtail wrasse) is a species of wrasse native to the Red Sea and Indian Ocean. It is another one of the big wrasses which has a very low abundance on the local scale and in this case a limited geographical distribution. Broomtail wrasses lives in shallow waters, but also at 2 to 30 m of depth on the outer side of the reefs. It is often going around on the sandy bottoms, at the limit of the madreporic formations, in the prairies of submerged grasslands looking for shells it crushes easily, like a nutcracker. C. lunulatus can...

  7. Plakobranchus ocellatus

    Ketabi, Ramin; Jamili, Shahla
    Plakobranchus ocellatus is a common inhabitant of shallow coral reef pools and lagoons. It is seldom seen as it is well camouflaged, half buried in the coral sand. P. ocellatus lives in sheltered, shallow water habitats with stones or gravel and silt. Maximum length is 6 - 7 cm in Persian Gulf (Iran, Kish Island). It may seem puzzling that this slug has evolved a method of storing chloroplasts, but at the same time shades them from the sunlight which would allow them to photosynthesis and provide nourishment for the slug. It is a theory, which is totally untested, that...

  8. Symbiosis between Ptereleotris arabica and Cryptocentrus lutheri and Alpheus djiboutensis

    Ketabi, Ramin; Jamili, Shahla

  9. Pseudobiceros kryptos

    Ketabi, Ramin; Jamili, Shahla

  10. Sabellastarte spectabilis

    Ketabi, Ramin; Jamili, Shahla

  11. Sand collar

    Ketabi, Ramin; Jamili, Shahla

  12. Megalomma vesiculosum

    Ketabi, Ramin; Jamili, Shahla
    Megalomma vesiculosum (Giant Feather Duster Worm) has reported for the first time from Persian Gulf (Iran, Kish Island). M. vesiculosum is a polychaete worm that reaches up to 12 cm in length. It has relatively few (about 50) tentacles, each with a large eyespot at the free end. It creates a long and tough tube, which is mostly encrusted untidily with large shell fragments and small stones. The tube protudes no more than 40-50 mm (in Iran, Kish Island) from coarse sand or muddy gravel at low water and below. The body and crown vary in color from yellowish to...

  13. Spirobranchus giganteus

    Ketabi, Ramin; Jamili, Shahla

  14. Scorpaenopsis barbata

    Ketabi, Ramin; Jamili, Shahla
    Scorpaenopsis barbata, lives along sandy beaches, rocky coastlines and coral reefs and in shallow waters. Its name refers to the fleshy outgrowth of skin protruding from its chin. They have a wide mouth and broad spiny head and venom glands that may occur at the base of fin spines which can produce deep and painful wounds. The feathery fins which cover the scorpion fish body help in the camouflaging of the animals into the surrounding coral. Also, the coral- like frilly, fleshy flaps of skin protruding from its chin add to the species camouflage ability and help the fish to...

  15. Different views on Digital Scholarship: separate worlds or cohesive research field?

    Raffaghelli, Juliana E.; Cucchiara, Stefania; Manganello, Flavio; Persico, Donatella
    This article presents a systematic review of the literature on Digital Scholarship, aimed at better understanding the collocation of this research area at the crossroad of several disciplines and strands of research. The authors analysed 45 articlesin order to draw a picture of research in this area. In the first phase, the articles were classified, and relevant quantitative and qualitative data were analysed. Results showed that three clear strands of research do exist: Digital Libraries, Networked Scholarship and Digital Humanities. Moreover, researchers involved in this research area tackle the problems related to technological uptake in the scholar's profession from different...

  16. Best-practice model for technology enhanced learning in the creative arts

    Power, Jess; Kannara, Vidya
    This paper presents a best-practice model for the redesign of virtual learning environments (VLEs) within creative arts to augment blended learning. In considering a blended learning best-practice model, three factors should be considered: the conscious and active human intervention, good learning design and pedagogical input, and the sensitive handling of the process by trained professionals. This study is based on a comprehensive VLE content analysis conducted across two academic schools within the creative arts at one Post-92 higher education (HE) institution. It was found that four main barriers affect the use of the VLE within creative arts: lack of flexibility...

  17. The management of schools’ websites in Cantabria, Spain

    Alvarez-Alvarez, Carmen; Inés-García, José
    School websites are not only sources of information and documentation, but also means of communication that are increasingly being accessed by members of society, especially by the different educational communities, thanks to the democratisation of Internet access. This paper deals with a qualitative research project in which information and communication technology coordinators of infant and primary publicly funded private schools (concertados) and state schools in urban, rural and semi-urban/rural areas within the Region of Cantabria (Spain) were interviewed in order to understand how school websites are managed. The findings show a range of views and practices in the schools’ management...

  18. Some aspects of grading Java code submissions in MOOCs

    Király, Sándor; Nehéz, Károly; Hornyák, Olivér
    Recently, massive open online courses (MOOCs) have been offering a new online approach in the field of distance learning and online education. A typical MOOC course consists of video lectures, reading material and easily accessible tests for students. For a computer programming course, it is important to provide interactive, dynamic, online coding exercises and more complex programming assignments for learners. It is expedient for the students to receive prompt feedback on their coding submissions. Although MOOC automated programme evaluation subsystem is capable of assessing source programme files that are in learning management systems, in MOOC systems there is a grader...

  19. How do medium naturalness and personality traits shape academic achievement and perceived learning? An experimental study of face-to-face and synchronous e-learning

    Blau, Ina; Weiser, Orli; Eshet-Alkalai, Yoram
    This controlled experiment examined how academic achievement and cognitive, emotional and social aspects of perceived learning are affected by the level of medium naturalness (face-to-face, one-way and two-way videoconferencing) and by learners’ personality traits (extroversion–introversion and emotional stability–neuroticism). The Media Naturalness Theory explains the degree of medium naturalness by comparing its characteristics to face-to-face communication, considered to be the most natural form of communication. A total of 76 participants were randomly assigned to three experimental conditions: face-to-face, one-way and two-way videoconferencing. E-learning conditions were conducted through Zoom videoconferencing, which enables natural and spontaneous communication. Findings shed light on the trade-off...

  20. TELFest: an approach to encouraging the adoption of educational technologies

    Latif, Farzana
    Barriers to technology adoption in teaching and learning are well documented, with a corresponding body of research focused on how these can be addressed. As a way to combine a variety of these adoption strategies, the University of Sheffield developed a Technology Enhanced Learning Festival, TELFest. This annual, week-long event, emphasises the role technology can play through an engaging learning experience which combines expert-led practical workshops, sharing of practice, discussions and presentations by practitioners. As the popularity of the event has grown and the range of topics expanded, a community of practice has organically coalesced among attendees, supporting the mainstream...

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