Recursos de colección

Aquatic Commons (36.954 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 5.702

  1. Activity patterns and distribution of Galapagos bats

    Key, Gillian; Sangoquiza, Miguel
    Preliminary studies were carried out on the activity and distribution of the two species of Galapagos bat using heterodyne bat detectors. Monitoring at four sites on Santa Cruz Island from November 2003 to August 2005 revealed no evidence for seasonal migration between the highlands and lowlands for either species. Bat activity was lowest at all sites during December–March and increased over the year. The Hoary Bat Lasiurus cinereus was the commoner of the two species and showed three nightly activity peaks, as determined by all-night monitoring at one site in Santa Cruz Island over a period of three months in 2004. The Red Bat Lasiurus...

  2. Zebrasoma xanthurum (Blyth, 1852)

    Ketabi, Ramin; Jamili, Shahla
    Zebrasoma xanthurum, the purple tang or yellowtail tang, is a species of reef surgeonfish. Purple tangs typically inhabit coral reef ecosystems. Purple tang found in groups in coral-rich areas or on rocky bottoms Z. xanthurum show varying degrees of habitat preference and utilization of coral reef habitats, with some species spending the majority of their life stages on coral reef while others primarily utilize seagrass beds, mangroves, algal beds, and /or rocky reefs. The majority of Z. xanthurum are exclusively found on coral reef habitat, and of these, approximately 80% are experiencing a greater than 30% loss of coral reef...

  3. Blenniella periophthalmus (Valenciennes, 1836)

    Ketabi, Ramin; Jamili, Shahla
    Blenniella periophthalmus is a species of combtooth blenny found in coral reefs. It is commonly known as the blue-dashed rockskipper, bullethead rockskipper, false rockskipper, or the peppered blenny. B. periophthalmus is a marine, reef-associated species that occurs in tropical climates with a depth range of 0-5 m. We report for the first time from Persian Gulf (Kish Island, Iran).  This species inhabit exposed outer intertidal reef flats, where it can hide in cracks and holes. It is commonly observed clinging to rocks as the water recedes below them during the low cycle of the swell and this species is often confused with mudskipper gobies. Maximum length is 10...

  4. Antennablennius variopunctatus (Jatzow & Lenz, 1898)

    Ketabi, Ramin; Jamili, Shahla
    Antennablennius variopunctatus, the Orange-dotted blenny, is a species of combtooth blenny found in coral reefs in the western Indian Ocean. A. variopunctatus is unique to the intertidal area and would be overlooked in conventional reef surveys. Maximum length is 8 cm in Persian Gulf (Iran, Kish Island). There are insufficient algae on the rocks, it is important to feed more frequently and supplement with algae rich food. A. variopunctatus is oviparous, their eggs are demersal and adhesive, and are attached to the substrate via a filamentous, adhesive pad or pedestal. Larvae are planktonic, often found in shallow, coastal waters. A....

  5. Enneapterygius ventermaculus (Holleman, 1887)

    Ketabi, Ramin; Jamili, Shahla
    Enneapterygius ventermaculus, known commonly as the Blotched triplefin, is a species of triplefin blenny. They are generally coral reef inhabitants, their colouring and small size rendering them cryptic. E. ventermaculus is a demersal, marine species that occurs in subtropical climates and has a depth range of 0-12 m. New record is given from Iranian Waters of Persian Gulf (Kish Island). Maximum length is 4 cm in Kish Island male/unsexes. This is a cryptic species, found on rocky and coral reefs with encrusting algae and invertebrates. Triplefin blennies are small, large-eyed fish that live in shallow coastal waters around the world....

  6. Two bird records of note in Galapagos in May 2006

    Meek, E.R.
    The seventh records in Galapagos of Parkinson’s Petrel Procellaria parkinsoni and of Pectoral Sandpiper Calidris melanotos are described.

  7. Distribution of fire ants Solenopsis geminata and Wasmannia auropunctata (Hymenoptera: Formicidae) in the Galapagos Islands

    Herrera, Henri W.; Causon, Charlotte E.
    The Little Fire Ant Wasmannia auropunctata (Roger) and the Tropical Fire Ant Solenopsis geminata (Fabricius) are considered two of the most serious threats to the terrestrial fauna of Galapagos, yet little is known about their distribution in the archipelago. Specimens at the Charles Darwin Research Station and literature were reviewed and distribution maps compiled for both species. W. auropunctata is currently recorded on nine islands and six islets and S. geminata is recorded on seven islands and six islets. New locations were registered, including the first record of W. auropunctata on Española and North Seymour islands, and of S. geminata...

  8. Alkaloidal protection of Utetheisa galapagensis (Lepidoptera:Arctiidae)against an invertebrate and a vertebrate predator in the Galapagos Islands

    Garrett, Sarah E.; Conner, William E.; Roque Albelo, Lázaro
    The Galapagos endemic moth Utetheisa galapagensis has been shown to sequester pyrrolizidine alkaloids from its host plants in the genus Tournefortia (Boraginaceae). We here assess the palatability of U. galapagensis adults to sympatric invertebrate and vertebrate predators. Adult U. galapagensis and Pilocrosis ramentalis (Pyralidae) controls, were offered to orb-weaving spiders Eustala vegeta and female lava lizards, Microlophus pacificus. The spiders’ reactions to the two types of prey were highly stereotyped; invariably the controls were eaten and the U. galapagensis were cut from the web and released. In comparison, when offered to female lava lizards both U. galapagensis and the pyralid controls...

  9. 1997-8 el Niño and the Galapagos tortoises Geochelone vandenburghi on Alcedo Volcano, Galapagos

    Marquez, Cruz; Wiedenfeld, David; Naranjo, Sixto; Llerena, Washington
    Body mass changes, mortality and nest and egg loss of the Galapagos tortoise Geochelone vandenburghi were studied on Alcedo Volcano, Isabela Island, before, during and after the El Niño event of 1997–8. The results suggest that fewer tortoises in the pre- and post-Niño periods gained body mass than lost, while during the El Niño event itself the tortoises gained mass. Before and after the El Niño, there was no mortality attributable to flooding in the ravines on the slopes of the volcano, but during the El Niño event 36 tortoises were found dead in the ravines. This is < 1 % of the total population....

  10. Galapagos commentary: Galapagos fur seal common name

    Grove, Jack; Brunner, Sylvia

  11. Pollen morphology of the Galapagos endemic genus Scalesia (Asteraceae)

    Jaramillo, Patricia; Trigo, M.M.
    Pollen grains from herbarium specimens of 22 taxa of the genus Scalesia Arn. (Asteraceae, Heliantheae) were examined by scanning electron and light microscopy. Scalesia present trizonocolporate, isopolar, radiosymmetric pollen grains, which are medium sized, oblate-spheroidal to prolate-spheroidal, circular in polar view and from circular to slightly elliptic in equatorial view. The exine is thick (c. 5–7 μm), with long, acute, conical echinae to 10 μm as supratectal elements.

  12. Controlling Invasives: Sea Grant Research Provides Insight into Lionfish Removal Efforts

    Stalling, C.; Albins, M.; Green, S.; Akins, L.; Appledoorn, R.S.; Tuohy, C.H.
    Sea Grant research across five state programs has focused on mitigating impacts from the lionfish invasion in the Western Atlantic and Caribbean by investigating different management strategies

  13. Boloceroides mcmurrichi (Kwietniewski, 1898)

    Ketabi, Ramin; Jamili, Shahla
    Boloceroides mcmurrichi is looking like an untidy mop, this anemone is sometimes seen in sea grass areas on many of our shores. It is possibly seasonal. Sometimes, large numbers are seen (up to 10-20 animals in a trip) and then none at all. Maximum length is 2 cm in Persian Gulf (Iran, Kish Island). Tiny swimming anemones may sometimes be confused with Sea grass anemones which have translucent tentacles with tiny spots. The swimming anemone harbors symbiotic single-celled algae (zooxanthellae). The algae undergo photosynthesis to produce food from sunlight. The food produced is shared with the sea anemone, which in...

  14. Alpheus djiboutensis (De Man, 1909)

    Ketabi, Ramin; Jamili, Shahla
    Alpheus djiboutensis, a member of snapping shrimp (Family Alpheidae) live in burrows together with gobiid fishes. Maximum length is 8 cm in Persian Gulf (Iran, Kish Island). A. djiboutensis is common in sponges and corals. A. djiboutensis lives on surfaces sandy depths at depths between 2 and 15 meters symbiosis between A. djiboutensis and Cryptocentrus lutheri (our observation in Iran, Persian Gulf, Kish Island). Despite being 2 completely different animals. They often live in symbiosis. The goby build a cave into the substrate which undertakes A. djiboutensis to clean and maintain, usually the C. lutheri stands so that its tail...

  15. Ecsenius pulcher (Murray, 1887)

    Ketabi, Ramin; Jamili, Shahla
    Ecsenius pulcher is an almost exclusively benthic species that inhabits tropical, marine waters. E. pulcher is found on rocky shores where it hides in crevices. Maximum standard length is 4.4 cm male/unsexed. Maximum length is 7 cm in Persian Gulf (Iran, Kish Island). Larvae are planktonic, often found in shallow coastal waters. E. pulcher can have different color patterns. Dark brown dorsally on head and body and (abruptly) white below or dark brown and posterior part of the body is orange-yellow with narrow dark bars. E. pulcher has a solid color form and one in which the melanophores have been...

  16. Plakobranchus ocellatus (van Hasselt, 1824)

    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 P. ocellatus deliberately...

  17. Alticus kirkii (Günther, 1868)

    Ketabi, Ramin; Jamili, Shahla
    The Kirk's blenny (Alticus kirkii) is a species of combtooth blenny (family Blenniidae) in the genus Alticus. It is a tropical blenny. Adults are found in the intertidal zone of exposed rocky shores, often out of the water and down to around 2 m and often spend time out of the water. They are able to breathe air when on land. Air-breathing A. kirkii utilize both aquatic and terrestrial habitats. They actively shuttle back and forth between rock pools and air (skipper). During the day it emerges from the water to feed upon the algae growing in the splash zone...

  18. Pseudobiceros kryptos (Newman & Cannon, 1997)

    Ketabi, Ramin; Jamili, Shahla
    Pseudobiceros kryptos is usually found on colonial ascidians under rubble on the reef crest or reef slope. P. kryptos is free swimming flatworm. New record is given from Persian Gulf (Iran, Kish Island). P. kryptos is the only polyclads which actively swim with exaggerated undulations of its ruffled margin. This, along with flamboyant coloration, is thought to be aposematic or warning behavior advertising their suspected unpalatability to visual predators such as fish. P. kryptos is in part: "Background color variable; mottled olive green to lime green and white, large irregular brown and olive green spots on the margin, large irregular...

  19. Haminoea cyanomarginata (Heller & Thompson, 1983)

    Ketabi, Ramin; Jamili, Shahla
    Haminoea cyanomarginata is found in the coral rubble in shallow waters, while in the Persian Gulf it is usually seen at night, between 2-5 in of depth, on rocky surfaces covered with algae. We report for the first time from Persian Gulf (Kish Island, Iran). Maximum length is 5 mm in Persian Gulf. We can observe H. cyanomarginata only 2-3 days in March in each year in Kish Island (Iranian Waters). It has a number of distinctive color features, the most prominent being the purple edge to the parapodia, head shield, and infrapallial lobe. The body, and mantle, which can...

  20. Goniobranchus annulatus (Eliot, 1904)

    Ketabi, Ramin; Jamili, Shahla
    Goniobranchus annulatus is a species of sea slug, a very colourful dorid nudibranch, a shell-less marine gastropod mollusc. G. annulatus inhabits various sections of coral reefs, ranging from the shallow subtidal adjacent to mangrove forests up to 15 m depth near the reef crest. G. annulatus forms mating aggregations similar to those found in many sea hares. G. annulatus is simultaneous hermaphrodites. Both individuals darts their penis toward each other to induce one to act as a male and the other as the female. The victorious one to penetrate the body wall is the dominant male. Eggs are deposited on...

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.