Diversity and distribution of the Isopoda (Crustacea, Peracarida) of Kuwait, with an updated checklist

Thirty-eight species of Isopoda, belonging to 13 families and 29 genera, are listed from Kuwait based on previous literature records (of 17 species) and collections carried out along Kuwait’s coastal and subtidal zones during the present study. The majority of species belongs to the suborder Cymothoida (23), followed by Sphaeromatidea (9), Oniscidea (3), Valvifera (2), and Asellota (1). In total, 25 species were collected and identified from 12 families and 22 genera from Kuwaiti coastal and subtidal areas. These include eight families, 15 genera, and 21 species recorded for the first time from Kuwait. Isopod diversity was highest in the sandy rock areas, including southern Kuwait, particularly in Al-Khiran and Al-Nuwaiseeb, and in mixed habitat (muddy, rocky, and sandy) intertidal transects such as in Failaka Island. The species number increased from the subtidal and lowest zones into the high tidal zone. Isopods were found in sandy substrata, among shells, cobbles, rocks, dead corals, and algae.

Mutual impact of reservoir sands and acidic liquid radioactive waste

The work is devoted to the study of the behavior of long-lived alpha-emitting radionuclides (Pu, Am, U, Np) under the conditions of injection of acidic liquid radioactive waste into a sandy rock reservoir bed. Different mineral phases of initial reservoir sands, secondary minerals formed when interacting with waste solutions, as well as phases precipitating from the waste solution are considered in terms of their retention properties towards to actinides.

ASPEK REPRODUKSI IKAN LOUHAN HIBRID SEBAGAI IKAN ASING INVASIF DI DANAU MATANO, SULAWESI SELATAN

Penelitian mengenai aspek reproduksi ikan asing invasif di Danau Matano dibutuhkan dalam upaya pengendalian dan pemberantasan populasinya. Penelitian ini bertujuan untuk mengetahui aspek reproduksi ikan louhan yang diharapkan dapat digunakan sebagai acuan untuk pengendalian ikan asing invasif di Danau Matano, Sulawesi Selatan. Sampel ikan diperoleh dengan menggunakan jaring insang percobaan dengan berbagai ukuran mata jaring pada Mei dan Oktober 2015 serta pada Februari, Juli, dan September 2016 di 14 stasiun penelitian. Penentuan jenis kelamin dan tingkat kematangan gonad (TKG) berdasarkan ciri reproduksi primernya. Fekunditas total dihitung menggunakan metode gravimetrik. Ikan louhan yang tertangkap sebanyak 1.118 ekor terdiri atas 552 ekor ikan jantan, 512 ekor ikan betina, dan 54 ekor tidak dapat ditentukan jenis kelaminnya. Nisbah kelamin secara temporal berada pada kondisi seimbang dengan perbandingan total sebesar 1,1:1. Ikan louhan jantan dan betina mencapai rata-rata ukuran pertama kali matang gonad (Lm50) masing-masing pada panjang total 12,6 cm dan 10,2 cm. Ikan jantan berukuran lebih besar daripada betina pada TKG yang sama. Diameter telur berkisar antara 0,25-2,35 mm (rerata 1,31±0,37 mm) dengan fekunditas berkisar antara 104-3.375 butir. Ikan louhan termasuk tipe pemijah bertahap dan mampu memijah sepanjang tahun di berbagai tipe karakteristik habitat. Puncak pemijahan terjadi pada musim penghujan dan kemarau. Substrat dasar berupa pasir berbatu di kedalaman 15 meter merupakan daerah utama pemijahan ikan louhan di Danau Matano. Rekomendasi pengendalian ikan louhan di Danau Matano melalui penangkapan perlu dilakukan sebelum mencapai ukuran Lm50, di seluruh daerah litoral danau (<10 meter) pada musim kemarau (April-Juni) dan penghujan (September-November).The information on fish reproduction aspects of invasive alien species in Matano Lake is required to setup measure for controlling and eradicating their population. This research aims to determine the reproductive aspects of flowerhorn cichlid that could used as a reference for controlling the invasive alien species in the Matano Lake, South Sulawesi. Sample was collected by using experimental gill-net with various mesh sizes in 14 research stations in several periods (May 2015, October 2015, February 2016, July 2016, and September 2016). Sex determination and gonadal stages identified based on the characteristics of primary reproduction. Total fecundity is calculated using gravimetric method. The total individual flowerhorn cichlid was 1,118 fishes that consists of 552 males, 512 females, and 54 unidentified. The temporary sex ratio indicated balance conditions by ratio 1.1:1. Length at first maturity (Lm50) of male and female of flowerhorn cichlid reached at 12.6 cmTL and 10.2 cmTL, respectively. Males are larger than females at the same gonad maturity stage. The eggs diameter ranged from 0.25 to 2.35 mm (average of 1.31 ± 0.37 mm) with fecundity ranged from 104-3,375 egg which indicated that flowerhorn cichlid was a partial spawner. Flowerhorn cichlid spawned throughout the year (multi spawning) in various types of habitat characteristics with spawning peaks in the rainy and dry seasons. Sandy rock in the depth of 15 meters is the main of spawning area of flowerhorn cichlid in the Matano Lake. The recommendation for controlling flowerhorn cichlid in Matano Lake by fishing, need to be done before its size reaching the Lm50, across the littoral area of the lake (<10 meters) in the dry (April-June) and rainy seasons (September-November).

Deposition Model of Point Bar Sand of Ancient Bengawan Solo as Regional Groundwater Reservoir in Ngloram - Cepu, Central Java Blora

While the geological study of sedimentary sand point bar of river is scientifically attractive, economically sedimentary sand is a material for the building. The sedimentary sand point frequency contains metal and nonmetal prescripitation that has a highly economical value. It also functions as a reservoir of good rock water, because it has good porosity and permeability. The sedimentary sand point bar of Bengawan Solo that has been for 600.000 years ago in Ngloram-epu, has the thickness approximately around 5 – 25 m, grown horisontally around 5 – 7 km, and located > 50 km2 which covers Ngloram-Wado-Kedungtuban. The sandy rock functioned as a good groundwater reservoir rock. The sand point bar in Bengawan Solo is precipitated on the stairs of Bengawan Solo that is situated on the clay rock having tongue formation. The water of reservoir point bar is expected to fulfill the needs of 100.000 inhabitants in Cepu and the cities around.

XXX.—Note on some Fossils from Seymour Island, in the Antarctic Regions, obtained by Dr Donald

These fossils are especially interesting on account of their having been obtained from a more southerly point than any hitherto recorded. The number of specimens is nine; five of these are referable to the genus Cucullœa, one to Cytherea, one probably to Natica, and two are fragments of Coniferous Wood. With the Cytherea are other small shells which may indicate the presence of Crassatella (?) and Donax (?). Two of the pieces of Cucullœa are entirely free from matrix, while three show in their interiors a fine sandy rock which effervesces when treated with hydrochloric acid. The shells themselves have a calcedonic appearance, but, like the matrix, they effervesce strongly with acid; they are much denuded, having apparently been long exposed to the weather. The matrix within the Cytherea is coarser than that in the Cucullœa, containing, besides fragments of quartz and of a black rock, numerous fragments of shells. The Natica (?) is almost free from matrix, and is much denuded, but in some of the crevices sandy material may be seen very like the matrix of the other shells. All these genera have a wide distribution in time, and are now living, consequently they give but little clue to the age of the rocks in which they were found. Cucullœa is rare at the present day, and the few known species occur in the Mauritius, Nicobar, and China; but as a fossil it is very common and widely distributed.

On the Fossil Foraminifera of Malta and Gozo

In a former volume of the ‘Geologist’ there are notices of the geology of Malta and Gozo (vol. for 1860, pp. 198, 275, 421), from which it appears that the stratal groups forming these islands are, in downward succession,— 1.Upper Limestone ; fossiliferous.2.Soft sandy rock, consisting of yellow, green, and black sand in variable proportions, and containing many shells and echinoderms, chiefly as casts, and sharks’ teeth.3.Bluish marl, with sharks’ teeth and other fossils, especially Pecten Burdigalensis.4.Light-yellow calcareous freestone ; the common building-stone of the islands, rich with echinoderms, and containing also nautilus, fish-remains, and other fossils: this comprises also a band of chocolate- coloured pebbles, with sharks’ teeth.5.Lower Limestone, white and hard; with Scutella subrotunda, fish-teeth, and a few other fossils.These strata have been described by Captain Spratt, in the Geol. Soc. Proc, vol. iv. p. 225, etc., and their fossils determined and enumerated by Professor E. Forbes, ib., p. 230, etc. Dr. Wright also gave a notice of the beds, and descriptions of several of their fossils, in a paper published by the Cotteswold Nat. Field-club, and in the Annals Nat. Hist., 2nd ser., vol. xv.; lastly, Dr. A. L. Adams and Dr. Wright communicated a paper on the Maltese Strata and Echinoderms to the Geological Society, in 1863.Having lately received, from Captain F.W. Hutton and Dr. A.Leith Adams, some fine specimens of foramiuifera from the Maltese beds, carefully labelled as to their respective strata, as well as some notes on the strata from the same friends, I am enabled to add something as to the distribution of the foraminifera.Stratum No. 1, which, being largely composed of corallines (Nulliporae, E. Forbes's List, loc. cit.), and destitute of corals, seems to have no title to its old name of “Coral-limestone,” contains Heterostegina depressa, according to Dr. Adams and Captain Hutton; the latter informs me that this limestone is sometimes 230 feet thick, Pecten Pandora being one of its most abundant fossils.