scholarly journals Distribution and abundance of planktonic mollusks along a longitudinal gradient in the Southeastern Pacific off Chile

2021 ◽  
Vol 56 (2) ◽  
pp. 122-133
Author(s):  
Bernardita Campos ◽  
Mauricio F. Landaeta
Keyword(s):  
Mesh Size ◽  
First Record ◽  
Oceanic Islands ◽  
Rapa Nui ◽  
Longitudinal Gradient ◽  
Class Rank ◽  
Southeastern Pacific ◽  
Bivalve Larvae ◽  
Hydrographic Conditions ◽  
Chemical Water

The objectives of this research were to estimate the abundance of the main groups of planktonic mollusks (meroplanktonic larvae, holoplanktonic gastropods and cephalopod paralarvae), and relate these groups to the physical-chemical water properties along a longitudinal gradient between Caldera, on the coast of mainland Chile, and the Easter Island ecoregion (Rapa Nui Island and Salas y Gómez Island), in the Southeast Pacific Ocean. Plankton samples were collected over the course of the CIMAR 21-Islas Cruise, from October to November 2015, at 33 oceanographic stations via vertical hauls of a WP2 net (180-µm mesh size) from a maximum depth of 300 m to the sea surface. Mollusks were sorted, counted and initially assigned to Class rank, later being identified to lower taxonomic ranks. Planktonic mollusks were obtained at all stations, and were composed of 92.7% of Gastropoda and 7.3% of Bivalvia. The total abundance of mollusks varied between 55 and 4,922 individuals 100 m-3.Euthecosomate gastropods exhibited the highest occurrence within the oceanic area. Meanwhile, no paralarvae were captured. Differences in the composition of planktonic mollusks between the continental and oceanic zones were evident. Bivalve larvae increased their abundance in warmer, salty and vertically mixed waters. These results are the first record of meroplanktonic mollusks in waters near the Chilean oceanic islands, and suggest that planktonic mollusks display spatial variation at the scale of the South Pacific Basin, which could be related to the hydrographic conditions and the water column structure.

scholarly journals Laju Pertumbuhan Rumput Laut Gracilaria sp Melalui Budidaya IMTA (Integrated Multi Trophic Aquaculture) di Pantai Geger, Nusa Dua, Kabupaten Badung, Bali

2017 ◽  
Vol 4 (2) ◽  
pp. 191
Author(s):  
Kadek Yudiastuti ◽  
I Gusti Bagus Sila Dharma ◽  
Ni Luh Putu Ria Puspitha
Keyword(s):  
Water Quality ◽  
Design Method ◽  
Salt Water ◽  
Mesh Size ◽  
General Characteristic ◽  
Quality Parameters ◽  
Seaweed Cultivation ◽  
Randomized Design ◽  
Physical And Chemical ◽  
Chemical Water

Gracilaria sp is red alga which belong to class rhodophyceae. It can grow in shallow salt water with a general characteristic is having a cylindrical and branched thallus form. Seaweed cultivation can be performed through IMTA (Integrated Multi Trophic Aquaculture) method. The basic principle of cultivation through the IMTA method is utilizing service of the low thropic level species in marine ecosystems, such as shells and seaweed.  This method is believed to be able to overcome the environmental problems caused by cultivation activities, such as feces and uneaten feed. This research was perfomed 45 days, from February 25 to April 11, 2017. It was held at Geger Beach, Nusa Dua, Badung Regency, Bali, using a complete randomized design method that consist of three treatments and three repetition for each treatment. Treatment control (T1) consisted of 10 bunches of seaweed 100 grams without the abalone, treatement 2 (T2) consisted of 10 bunches of seaweed 100 grams and 20 abalones and treatement 3 (T3) consisted of 10 bunches of seaweed 100 grams and 40 abalones. The result showed that specific growth rate in Gracilaria sp.  was highest in treatment T1, compared to treatment T2 and T3. This was caused by the cage construction of abalone amd the present of small mesh size net to cover the seaweed  planting, which made the growth was not optimal.  However, the use of a nets system in seaweed cultivation could minimize the loss of thallus. It was proved by the survival rate of seaweed in first, second and third, that is averagely high, ranging from 90% to 100%. Physical and chemical water quality parameters are also measured, and It showed that the water quality was suitable for the cultivation of both, seaweed and abalone.

First record of Alternatipathes bipinnata (Cnidaria: Antipatharia) in the Southern Hemisphere

Zootaxa ◽  
2017 ◽  
Vol 4312 (1) ◽  
pp. 189 ◽  
Author(s):  
JUAN FRANCISCO ARAYA ◽  
JUAN ANTONIO ALIAGA ◽  
DENNIS OPRESKO
Keyword(s):  
Southern Hemisphere ◽  
Deep Water ◽  
First Record ◽  
Transverse Diameter ◽  
Northern Mexico ◽  
Southeastern Pacific ◽  
Deep Waters ◽  
The Pacific ◽  
The Family ◽  
Eleven Species

Antipatharians are still poorly documented in the southeastern Pacific, with just eleven species reported in Chilean waters, all of them distributed in subtidal areas from 70 to 2000 m depth (Häussermann & Försterra, 2007; Cañete & Häussermann, 2012; Araya et al. 2016a). Among the family Schizopathidae Brook, 1889, which is characterized by polyps elongated in the direction of the axis and having a transverse diameter of 2 mm or more (Opresko, 2002), the recently described deep-water genus Alternatipathes Molodtsova & Opresko, 2017, encompasses two recognized species, Alternatipathes alternata (Brook, 1889), reported from abyssal basins (2670 to 5089 m depth) of the Indian and Pacific Oceans, and Alternatipathes bipinnata (Opresko, 2005), known from a few specimens collected in deep waters (1130 to 2846 m) off the Pacific coasts of northern Mexico and southern USA (Opresko, 2005; Molodtsova & Opresko, 2017). 

scholarly journals First record of the genus Limonium (Plumbaginaceae) from the Malesian region

Phytotaxa ◽  
2013 ◽  
Vol 152 (1) ◽  
pp. 56
Author(s):  
Koh Nakamura ◽  
Rosalio Rivera Rubite ◽  
Goro Kokubugata ◽  
Kono Yoshiko ◽  
Masatsugu Yokota ◽  
...  
Keyword(s):  
Papua New Guinea ◽  
Field Survey ◽  
Present Finding ◽  
East Asian ◽  
First Record ◽  
The Philippines ◽  
Oceanic Islands ◽  
Brunei Darussalam ◽  
Baseline Knowledge ◽  
Taiwan Island

The absence of the cosmopolitan genus Limonium Miller (1754: no pagination) (Plumbaginaceae) in the mega-diverse flora of the Malesian region (comprising Brunei Darussalam, Indonesia, Malaysia, Papua New Guinea, the Philippines, and Singapore; Merrill 1923, Ridley 1923, Steenis 1949, Backer & Bakhuizen van den Brink Jr. 1965, Balgooy 1993, Coode et al. 1996, Balgooy 2001, Conn et al. 2004, Chong et al. 2009, Pelser et al. 2011) has intrigued taxonomists and biogeographers since Steenis (1949) noted this. During a field survey as part of the project on floristic and phylogenetic biogeography in the island chain of the Philippines, Taiwan, and southern Japan, we found a population of Limonium in the northern Philippines (Batan Islands) that represents the first record of the genus in the Malesian region. Batan Islands, comprising 10 small (≤ 83.1 km2) oceanic islands, is the northernmost tip of the Malesian region, being ca. 190 km north of Luzon Island of the Philippines and ca. 140 km southeast of Taiwan Island. From the geological location, the present finding suggests that a more extensive survey in Batan Islands may add some more East Asian temperate genera to the flora of the Malesian region, although two enumerations of the early and mid 20th century provide us baseline knowledge of the flora of Batan Islands (Merrill 1908, Hatusima 1966).

Psychrolutes sio, a new psychrolutid fish (Scorpaeniformes) from the southeastern Pacific

1980 ◽  
Vol 58 (3) ◽  
pp. 443-449 ◽  
Author(s):  
Joseph S. Nelson
Keyword(s):  
New Species ◽  
Southern Hemisphere ◽  
Lateral Line ◽  
First Record ◽  
The Other ◽  
Body Color ◽  
Large Specimen ◽  
Future Studies ◽  
Southeastern Pacific ◽  
A New Species

Psychrolutes sio, a new species of Psychrolutidae from off northernmost Chile, is described from two specimens trawled at about 770–1150 m. The holotype is deposited in the Scripps Institution of Oceanography (SIO 72-184). The only large specimen, the 22.9-cm holotype, differs most conspicuously from the other two species of the genus Psychrolutes in having the head and body color a uniform brown, skin thin, lateral line pores in small but distinct tubes, and jaws equal. Psychrolutes sio represents the first record of the genus Psychrolutes to be recognized from the Southern Hemisphere. However, future studies may indicate that other southern psychrolutids of the genera Neophrynichthys and Cottunculoides should also be assigned to Psychrolutes.

scholarly journals Pisces, Gobiiformes, Gobiidae, Ctenogobius boleosoma (Jordan & Gilbert, 1882): first record for Maranhão state, northeastern Brazil

Check List ◽  
2017 ◽  
Vol 13 (3) ◽  
pp. 2120
Author(s):  
Erick C. Guimarães ◽  
Pâmella S. de Brito ◽  
Felipe P. Ottoni ◽  
Axel M. Katz ◽  
Jorge L. S. Nunes ◽  
...  
Keyword(s):  
Sampling Methods ◽  
Mesh Size ◽  
First Record ◽  
The State ◽  
Northeastern Brazil ◽  
Gill Nets ◽  
Estuarine Region

This study presents Ctenogobius boleosoma from the São Luis estuarine region, the first record from the state of Maranhão, northeastern Brazil. This species may have gone unrecorded from Maranhão due to the difficulties in collecting gobies by the usual sampling methods, such as gill nets, corking nets, and longlines, even when using nets with an appropriate mesh size.

scholarly journals First record of the genus <i>Beela</i> Banner & Blow, 1960, in upper Pleistocene sediments (past 600Ka) from the Norwegian-Greenland Sea

1992 ◽  
Vol 11 (1) ◽  
pp. 58-58 ◽  
Author(s):  
Henning A. Bauch
Keyword(s):  
North Atlantic ◽  
Mesh Size ◽  
First Record ◽  
Good Evidence ◽  
Greenland Sea ◽  
The Past ◽  
Neogloboquadrina Pachyderma ◽  
Polar Species ◽  
Continuous Presence ◽  
Almost Continuous

Abstract. Planktonic foraminifers from Pleistocene sediments from the Norwegian-Greenland Sea (NGS) have been subject to intense investigation during the past 20 years. This is mainly due to their almost continuous presence in glacial and interglacial times, and hence, their utility for establishing sound O18-isotopic curves. Traditionally, all are assigned to a polar and subpolar group. Neogloboquadrina pachyderma (sinistral) is the only polar species, whereas the subpolar group is made up of Globigerina quinqueloba, G. bulloides, G. universa, N. pachyderma (dextral), N. dutertrei, Globigerinita glutinata, Gl. uvula, Globorotalia inflata, Glr. truncalutinoides, Glr. scitula. N. pachyderma (sinistral) is almost continuously present during glacial/interglacial times. This is in contrast to the subpolar species that show main abundances in interglacial maxima only. Prior to this study, a species belonging to the genus Beela has never been mentioned to occur in Pleistocene sediments north of 55° latitude (Holmes, 1984). My specimens exhibit a thin-walled spinose test; trochospiral becoming streptospiral; last chamber radially elongated but never pointed or digitate; aperture very variable from small umbilical to larger extraumbilical-umbilical. Its size ranges from 200–660μm, but is mainly confined to the 250–500μm mesh-size fraction.These general characteristics agree well with the emendation of the genus Beela by Holmes (1984). Accordingly, the described species will in future be assigned to Beela megastoma (Earland).There is good evidence that Beela megastoma is not simply a ‘warmer water form’ being swept into the NGS by North Atlantic Waters as some of those mentioned above, but a species that seems to. . .

The first record of the genus Bryodelphax (Tardigrada: Heterotardigrada: Echiniscidae) from Easter Island, Rapa Nui (Pacific Ocean, Chile) with the description of a new species, Bryodelphax aaseae

Zootaxa ◽  
2010 ◽  
Vol 2343 (1) ◽  
pp. 45 ◽  
Author(s):  
REINHARDT M. KRISTENSEN ◽  
ŁUKASZ MICHALCZYK ◽  
ŁUKASZ KACZMAREK
Keyword(s):  
New Species ◽  
Pacific Ocean ◽  
First Record ◽  
Easter Island ◽  
Moss Sample ◽  
Rapa Nui ◽  
A New Species

A new heterotardigrade, Bryodelphax aaseae sp. nov. is described from a small moss sample collected in the Rano Kau Crater on Easter Island (Rapa Nui) in 1989. The new species belongs to the group of species within the genus that have ventral plates. B. aaseae sp. nov. is similar to B. weglarskae (Pilato, 1972), B. sinensis (Pilato, 1974) and B. iohannis Bertolani, Guidi & Rebecchi, 1995 but differs from them mainly by a different number and arrangement of ventral plates. This is the first record of the genus Bryodelphax from Easter Island/Rapa Nui.

scholarly journals Characterization of the geographical distribution pattern of the family Limacinidae Gray, 1840 (Mollusca - Gastropoda) in the waters of Northeastern of Brazil

2014 ◽  
Vol 14 (2) ◽  
Author(s):  
Valdeni Soares de Oliveira Koblitz ◽  
Maria Eduarda de L. Larrazábal
Keyword(s):  
Geographical Distribution ◽  
Mesh Size ◽  
First Record ◽  
Program Assessment ◽  
Ecological Aspects ◽  
The Family ◽  
First Time ◽  
Plastic Containers ◽  
Geographical Distribution Pattern

The geographical distribution of the family Limacinidae in the Northeastern coast of Brazil was analyzed by taking into account the most relevant ecological aspects, aiming to increase the knowledge about the Family. The material was collected during the 4th Oceanographic Expedition of the REVIZEE program (Assessment of the Sustainable Potential of Living Resources in the Exclusive Economic Zone - Avaliação do Potencial Sustentável de Recursos Vivos da Zona Econômica Exclusiva), in the months from September to December 2000. The studied area is located between 00°46’45”N and 13°53’45”S and between 29°15’40”W and 39°49’42”W, where six trips were performed, totaling 123 stations. The samples were collected using a bongo net (300- and 500-µm mesh size and net mouths of 60 cm in diameter) coupled with a digital flowmeter in oblique hauls from a depth of 0 to 200 m. For this study, the organisms retained in the 300-µm mesh were considered. On board the ship, the samples were placed in plastic containers, labeled, and fixed in 4% formaldehyde buffered with sodium tetraborate. In the laboratory, the samples were analyzed on a “Bogorov” tray under a binocular stereomicroscope. A total of 5655 individuals of the family Limacinidae were examined and were distributed as follows: 3 genera and 5 species. Representatives of the family Limacinidae were observed at high temperatures and salinities and were thus characterized as tropical and euhaline.Heliconoides inflatus was the species with the greatest abundance and frequency. Limacina lesueurii proved to be a rare, infrequently observed species. Limacina trochiformis andL. bulimoides were not abundant or frequent.Limacina lesueurii and L. bulimoides were recorded in neritic waters for the first time; this was also the first record ofL. lesueurii in the waters of Northeastern Brazil.Limacina trochiformis and L. bulimoidesexhibited wide distributions, although they were neither very frequently observed nor abundant. The distribution of Thielea helicoideswas restricted to oceanic waters. A correlation between Limacina bulimoides, Heliconoides inflatus, Thielea helicoides, and L. lesueurii was observed because they coexisted in the same niche.

Sign in / Sign up

Export Citation Format

Share Document