Viruses play a crucial role in aquatic ecosystems, where they cause mortality of organisms from bacteria to whales Suttle Despite their importance in ocean ecosystems, investigation of viruses associated with marine invertebrates has been largely restricted to commercially important crustacea e. Viral metagenomic studies — i. Viral metagenomic studies afford the ability to probe ambient pools of viruses i. Echinoderms are marine invertebrates characterized by radial symmetry and a water vascular system, and include sea stars, sea urchins, brittle stars, and crinoids. Amongst these, urchins are both commercially and environmentally crucial constituents of benthic habitats.
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We'd like to understand how you use our websites in order to improve them. Register your interest. Reproductive cycle, frequency and duration of spawning, energetic content of gonads, and reproductive output of the common green sea urchin Loxechinus albus were analyzed in the Beagle Channel Tierra del Fuego between May and May Gonad indices GI, percentages of gonad mass in total body mass were significantly higher in March, April, July, and August than in November and May, thus showing a negative correlation with the photoperiod.
Highest GI values of mature individuals were observed in August, and spawning occurred from September to December. In females, the mass-specific energy content of gonads ECG was highest in spawned gonads and lowest in mature ones, while in males ECG values were higher in immature stage and lower in premature and mature stages.
High ECG values can be explained by the abundance of nutritive phagocytes. Mean reproductive output was 7. This is a preview of subscription content, log in to check access. Rent this article via DeepDyve. Ansell AD Seasonal changes in biochemical composition of the bivalve Abra alba from the Clyde sea area.
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Walker CW, Lesser MP Manipulation of food and photoperiod promotes out-of-season gametogenesis in the green sea urchin, Strongylocentrotus droebachiensis : implications for aquaculture. In: Lawrence JM ed Edible sea urchins: biology and ecology. Elsevier, Amsterdam, pp 5— Yamamoto M, Ishine M, Yoshida M Gonadal maduration independent of photic conditions in laboratory-reared sea urchins, Pseudocentrotus depressus and Hemicentrotus pulcherrimus.
Rev Chil Hist Nat — Zar JH Biostatistical analysis. Prentice-Hall, New Jersey. Download references. This research was supported by P. The authors are grateful to D. Aureliano, M. Gutierrez and S. Rimbau for technical assistance, to M. Reprints and Permissions. Reproductive cycle and reproductive output of the sea urchin Loxechinus albus Echinodermata: Echinoidea from Beagle Channel, Tierra del Fuego, Argentina.
Polar Biol 33, — Download citation. Received : 13 November Revised : 21 July Accepted : 23 July Published : 07 August Issue Date : March Search SpringerLink Search. Abstract Reproductive cycle, frequency and duration of spawning, energetic content of gonads, and reproductive output of the common green sea urchin Loxechinus albus were analyzed in the Beagle Channel Tierra del Fuego between May and May Immediate online access to all issues from Subscription will auto renew annually.
References Ansell AD Seasonal changes in biochemical composition of the bivalve Abra alba from the Clyde sea area. Acknowledgments This research was supported by P. You can also search for this author in PubMed Google Scholar. View author publications. Rights and permissions Reprints and Permissions.
Complete Mitochondrial Genome of Chilean Sea Urchin: Loxechinus Albus (Camarodonta, Parechinidae)
Feeding and nutritional ecology of the edible sea urchin Loxechinus albus in the northern Chilean coast. The red sea urchin Loxechinus albus, an economically important species oceurring along the Chilean littoral benthic systems, has been heavily exploited by artisanal fisheries in recent decades. However, basic knowledge of its trophic biology is still scarce. Studies of this kind are critical to the successful development of farming techniques as an alternative to the harvest of natural populations. The aims of this study were to quantify the composition of L. Adult and juvenile specimens were sampled in spring and summer, fall and winter from the shallow subtidal zone of Iquique, northern Chile.
Loxechinus albus (Molina, 1782)
Food and Agriculture Organization of the United Nations for a world without hunger. Fisheries and Aquaculture Department. Print PDF. Search species. Contreras, S. Feeding behavior and morphological adaptations in two sympatric sea urchin species in central Chile.
Loxechinus albus is an echinoderm of the family Parechinidae , native to coastal southern South America, ranging from Ecuador, along the entire coasts of Peru and Chile, to Argentina, as well as the Falkland Islands. The globiferous pedicellariae have a neck between the stem and head, large valves and several lateral teeth. It is more numerous in exposed locations. It is a herbivore and seems to feed on whatever species of alga grow nearby.