Recursos de colección

Aquatic Commons (37.071 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 = Ecology

Mostrando recursos 1 - 20 de 3.250

  1. Chaetodon melapterus (Guichenot, 1863)

    Ketabi, Ramin; Jamili, Shahla
    Chaetodon melapterus also known as Black-finned Melon Butterflyfish, Blackfin Butterflyfish and Arabian Butterflyfish is a piscine so stunningly gorgeous, but we daren’t look directly at it lest we succumb to its spell. This species is usually found in coastal reefs rich in coral growth interspersed with sand patches. C. melapterus lives in coral rich areas of shallow coastal reefs; occasionally in aggregations. They feed exclusively on coral polyps and nothing else. Maximum length is 13 cm in Persian Gulf (Kish Island, Iran). It is found at depths between 2-16 m. C. melapterus are usually encountered in pairs, but sometimes observed...

  2. Chaetodon nigropunctatus (Sauvage, 1880)

    Ketabi, Ramin; Jamili, Shahla
    Chaetodon nigropunctatus or Black-spotted Butterflyfish inhabits shallow coral reefs and sandy lagoons rich in stony coral growth at depths between 3 - 15 m and feeds mainly on stony coral polyps. We report for the first time from Persian Gulf (Kish Island, Iran). Maximum length is 15 cm in Persian Gulf (Kish Island, Iran). C. nigropunctatus is indicator species for specific coral-feeding. The butterfly fish are found to be living both in groups and as an individual. They are found swimming in groups and sometimes they swim alone until they get a partner. C. nigropunctatus is oviparous breeders and monogamous,...

  3. Pseudochromis nigrovittatus (Boulenger, 1897)

    Ketabi, Ramin; Jamili, Shahla
    Pseudochromis nigrovittatus or Dottybacks are common inhabitants of coral reefs throughout the tropical Indo-West Pacific. P. nigrovittatus inhabits equally frequently mixed communities of macroalgae and hard corals and sparse hard coral communities on rock platform, including those dominated by Acropora, Porites, Galaxea. P. nigrovittatus was recorded from a depth range of 4–20 m. Maximum length is 8 cm in Persian Gulf (Iran, Kish Island). All dottybacks are hermaphrodites. The sexes are separate. There is a possibility of sexual dimorphism in P. nigrovittatus, such that males are usually bigger than females. Color and caudal fin morphology differences have also been observed....

  4. 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...

  5. 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...

  6. 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....

  7. Invasive plants in the Scalesia pedunculata forest at Los Gemelos, Santa Cruz, Galapagos

    Renteria, Jorge L.; Buddenhagen, Chris
    Volunteers were used to map invasive plants in 25 ha of one of the best remnants of Scalesia pedunculata forest at Los Gemelos, Santa Cruz Island, Galapagos. The most dominant invaders were the trees Cestrum auriculatum, Cedrela odorata and Cinchona pubescens, a vine Passiflora edulis, and the shrub Rubus niveus. Forest structure at the site suggests that further cyclical stand-level dieback, reportedly characteristic of S. pedunculata forests, is unlikely to occur in the near future. Although the invasion at Los Gemelos is continuous, we conclude that dieback provides extra opportunity for the establishment of invasive plants. Management is required to reduce invasive...

  8. Effects of the feral goat population explosion on Alcedo Volcano (Isabela, Galapagos) between 1986 and 1996

    Desender, Konjev; Baert, Leon; Maelfait, Jean-Pierre; Verdyck, Peter
    During the first week of April 1986, before the overwhelming presence of goats, we sampled terrestrial macro- invertebrates on Alcedo Volcano along an altitudinal transect from the seashore to the top. Vegetation composition and structure at all sampling sites were described and photographs were taken. In 1996, when the Alcedo feral goat population had exploded to an estimated 50,000 to 100,000 and before large scale goat control began, the same transect was resampled and redocumented. In this contribution, site descriptions are summarized, compared between 1986 and 1996 and illustrated with a series of photographs.

  9. Cover with contents of No. 64, 2006.

  10. 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...

  11. 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...

  12. Alticus kirkii

    Ketabi, Ramin; Jamili, Shahla; Shahbazi, Soheil
    Distribution: Alticus kirkii has a wide distribution throughout the western Indian Ocean, including Reunion, Mozambique, Tanzania, Seychelles, and Somalia, north to the Red Sea, east to India. It was found in Kish Island & Abu Musa Island of Persian Gulf (Iranian Waters).

  13. 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...

  14. 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...

  15. 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...

  16. 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...

  17. The size and structure of pelagic dolphin herds

    Scott, Michael David

  18. Thalassoma lunare (Linnaeus, 1758)

    Ketabi, Ramin; Jamili, Shahla
    Thalassoma lunare is also named the Moon Wrasse because of its yellow caudal fin shapes like crescent moon with long upper and lower lobes. It is an inhabitant of coral reefs and surrounding areas at depths from 1 to 20. T. lunare is the most abundant wrasse species in the Persian Gulf. This species can reach 16 cm in total length in Iran, Persian Gulf, Kish Island. Moon wrasses are active fish, said to be moving all day long. They are also territorial, nipping, chasing, and otherwise harassing fish that get in their way. Being diurnal, wrasses have strong vision,...

  19. Sepia pharaonis (Ehrenberg, 1831)

    Ketabi, Ramin; Jamili, Shahla
    The Sepia pharaonis (pharaoh cuttlefish) is a large cuttlefish species, growing to 80 cm in mantle length. Males are larger than females, the maximum recorded size for males is 80 cm and 5 kg, and for females 50 cm and 2 kg in weight (Iran, Persian Gulf, Kish Island). This cuttlefish lives in warm water (30°C) and is fast growing. They mate and spawn at 110 days and their life span is 240 days. They lay about 1500 eggs which take 14 days to develop at 28°C. Inhabiting the neritic zone, it is often found in depths up to 130...

  20. Valenciennea sexguttata (Valenciennes, 1837)

    Ketabi, Ramin; Jamili, Shahla
    Valencienna sexguttata, the Sixspot goby, is a species of goby native to the Indian Ocean and the western Pacific Ocean. It inhabits bays or lagoons in waters of from 1 to 25 meters with silt or sand substrates with larger pieces of rock under which to burrow. Maximum length is 12 cm in Persian Gulf (Iran, Kish Island). V. sexguttata usually in pairs and lives in a burrow under rocks. Commonly seen in aggregations over large areas in lagoons of atolls. They are tireless workers, remain on all the substrate very clean due to the peculiarity of their power. The...

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