scholarly journals ASPEK BIO-EKOLOGI DAN PEMANFAATAN KERANG MARGA ANADARA (MOLLUSCA: BIVALVIA: ARCIDAE)

OSEANA ◽  
2020 ◽  
Vol 45 (2) ◽  
pp. 69-85
Author(s):  
Eka Sulistiyaningsih ◽  
Ucu Yanu Arbi
Keyword(s):  
Coastal Waters ◽  
Economic Value ◽  
Marine Species ◽  
Feeding Habit ◽  
Filter Feeder ◽  
Tropical Waters ◽  
Almost All

One of various shellfish in Indonesia waters that has high economic value is genus Anadara, especially as an edible marine species. Anadara is traditionally known in the trade as blood cockles. There are approximately 100 species of blood cockles in subfamily Anadarinae, the largest member of family Arcidae. Systematic of Anadarinae still does not provide certainty until now, including because there are many variations between species. Anadara, and Arcidae, in general, is one of the most abundant families of mollusc in tropical waters, and spread out in almost all of the coastal waters and found in the basis of subsystems. Its growth will be better on soft mud substrate than sandy mud substrate. Blood cockles are known as a filter feeder that feeds using gills on plankton, especially on phytoplankton. The demand for blood cockles is increasing, thus encouraging production efforts that do not only rely on harvesting from nature but through cultivation also that has been done in several places in Indonesia, such as in Sumatra and Java. This paper discussed taxonomy and classification, morphology and anatomy, habitat and distribution, reproduction and aquaculture, diet and feeding habit, and economic value of blood cockles.

scholarly journals Spatiotemporal variation in size-structured populations using fishery data: an application to shortfin mako (Isurus oxyrinchus) in the Pacific Ocean

2017 ◽  
Vol 74 (11) ◽  
pp. 1765-1780 ◽  
Author(s):  
Mikihiko Kai ◽  
James T. Thorson ◽  
Kevin R. Piner ◽  
Mark N. Maunder
Keyword(s):  
Coastal Waters ◽  
Mixed Model ◽  
Linear Mixed Model ◽  
Marine Species ◽  
Structured Populations ◽  
Spatiotemporal Model ◽  
The North ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako ◽  
Catch Rates

We develop a length-disaggregated, spatiotemporal, delta-generalized linear mixed model (GLMM) and apply the method to fishery-dependent catch rates of shortfin mako sharks (Isurus oxyrinchus) in the North Pacific. The spatiotemporal model may provide an improvement over conventional time-series and spatially stratified models by yielding more precise and biologically interpretable estimates of abundance. Including length data may provide additional information to better understand life history and habitat partitioning for marine species. Nominal catch rates were standardized using a GLMM framework with spatiotemporal and length composition data. The best-fitting model showed that most hotspots for “immature” shortfin mako occurred in the coastal waters of Japan, while hotspots for “subadult and adult” occurred in the offshore or coastal waters of Japan. We also found that size-specific catch rates provide an indication that there has been a recent increasing trend in stock abundance since 2008.

scholarly journals Analisis Kandungan Klorofil Pada Anak Daun Tanaman Kelapa (Analysis of Chlorophyll Content in Children Leaves of Coconut Plants)

2019 ◽  
Vol 9 (2) ◽  
pp. 76
Author(s):  
Muhammad Tawary ◽  
Julius Pontoh ◽  
Lydia Momuat
Keyword(s):  
Chlorophyll Content ◽  
Chlorophyll A ◽  
Economic Value ◽  
Economic Benefits ◽  
Chlorophyll B ◽  
Solvent Extraction Method ◽  
Chlorophyll A And B ◽  
The Right ◽  
Almost All ◽  
Chlorophyll A Content

Analisis Kandungan Klorofil Pada Anak Daun Tanaman Kelapa (Analysis of Chlorophyll Content in Children Leaves of Coconut Plants) Muhammad Tawary1*), Julius Pontoh1), Lydia I.Momuat1)1)Jurusan Kimia, FMIPA UNSRAT Manado*Email korespondensi: [email protected] Diterima 7 Juli 2019, diterima untuk dipublikasi 10 Agustus 2019 Abstrak Tanaman kelapa banyak dibudidayakan sebagai tanaman pertanian. Tanaman kelapa memiliki nilai ekonomi yang tinggi karena hampir semua bagian tanaman kelapa memiliki manfaat ekonomis. Penelitian bertujuan untuk  mengembangkan metode analisis klorofil pada daun dan menentukan bagian anak daun yang memiliki kandungan klorofil tertinggi. Analisis kandungan klorofil dilakukan dengan metode ektraksi pelarut yang absorbansinya dibaca pada spektrofotometer UV-Vis. Kandungan klorofil a dalam daun bervariasi pada setiap bagian anak daun tanaman kelapa. Kandungan klorofil a pada posisi tengah anak daun kelapa (763.19 µmol/m2) dan kandungan klorofil b (196.22 µmol/m2). Kandungan klorofil a dan b pada setiap bagian anak daun dan posisi kanan dan kiri anak daun memiliki nilai yang relatif sama.Kata kunci: Kelapa, klorofil a, klorofil b Abstract Many coconut plants are cultivated as agricultural crops. Coconut plants have high economic value because almost all parts of coconut plants have economic benefits. The study aims to develop a method of chlorophyll analysis on leaves and determine the part of leaflets which have the highest chlorophyll content. Analysis of chlorophyll content was carried out by a solvent extraction method in which the absorbance was read in a UV-Vis spectrophotometer. The content of chlorophyll a in leaves varies with each part of the leaves of the coconut plant. Chlorophyll a content in the middle position of coconut leaf child (763.19 µmol / m2) and chlorophyll b content (196.22 µmol / m2). The content of chlorophyll a and b in each part of the leaf child and the right and left positions of the leaves have relatively the same value.Keywords: Coconut, Chlorophyll a, Chlorophyll b

Aggressions of the Socio-Economic System on the Natural Capital

2017 ◽  
pp. 109-140
Author(s):  
Constanţa Popescu ◽  
Constantin Popescu ◽  
Maria Luiza Hrestic
Keyword(s):  
Global Warming ◽  
Adverse Effects ◽  
Economic System ◽  
Acid Rain ◽  
Natural Environment ◽  
Natural Capital ◽  
Marine Species ◽  
Vertebrate Species ◽  
New Beginning ◽  
Almost All

Nearly 250 million years ago, the Earth was shaken by the amplest extinction known so far, which led to the extinction of up to 96% of all the marine species, 70% of the vertebrate species, and almost all the insects. This extinction affected the whole range of biodiversity so much. Nature took almost 10 million years to recover after this event. Life was really in danger on our planet at that moment, due to the dismal conditions that were created, and the current research shows that these dire conditions continued to occur, in the natural environment, after that, triggering numerous outbreaks that occurred for five to six million years following the initial crisis, triggered by the carbon rise and the repeated shortages of oxygen, the increased warming and other such adverse effects, which, once initiated, were uncontrollable and had disastrous effects. When life returned to normal and, gradually, after several million years, a new beginning was possible, the significant elements that caused the disaster - global warming, acid rain - sound strangely familiar to us today.

The marine planktonic dinoflagellate Tripos: 60 years of species-level distributions in Australian waters

2020 ◽  
Author(s):  
Gustaaf Hallegraeff ◽  
Ruth Eriksen ◽  
Claire Davies ◽  
Anita Slotwinski ◽  
Felicity McEnnulty ◽  
...  
Keyword(s):  
Coastal Waters ◽  
Arabian Sea ◽  
Light And Electron Microscopy ◽  
Species Level ◽  
Freshwater Species ◽  
Careful Attention ◽  
Tropical Waters ◽  
Australian Species ◽  
The Past ◽  
Water Species

We reviewed 15572 Australian species-level records of the marine planktonic dinoflagellate Tripos Bory (formerly Ceratium Schrank, a genus now restricted to freshwater species). The genus is represented by over 50 species and numerous varieties and forms in Australian tropical, subtropical and temperate marine waters and the Southern Ocean. There exists considerable plasticity in the morphology of many species, which has confounded species delimitations and created uncertainty around their spatial distributions. We newly illustrate by light and electron microscopy the rarely reported Tripos hundhausenii (Schröd.) Hallegr. & Huisman comb. nov. first described from the Arabian Sea, but increasingly being observed in Sydney coastal waters. A large number of Tripos species are widely distributed in temperate, subtropical and tropical waters and their distributions have remained remarkably stable in Australian waters over the past 60–80 years. By contrast, we identified a narrow group of warm-water species, including T. belone (Cleve) F.Gómez, T. cephalotus (Lemmerm.) F.Gómez, T. dens (Ostenf. & E.J.Schmidt) F.Gómez, T. digitatus (F.Schütt) F.Gómez, T. gravidus (Gourret) F.Gómez, T. incisus (G.Karst.) F.Gómez, T. paradoxides (Cleve) F.Gómez and T. praelongus (Lemmerm.) F.Gómez, that are commonly encountered off Sydney, rarely found down to Eden and Batemans Bay or Bass Strait, but occasionally occur as far south as King Island and Maria Island, Tasmania. These rare tropical Tripos species are carried southward by the East Australian and Leeuwin Currents and deserve careful attention in monitoring for future range expansions, changes in seasonality or upwelling or incursion of deep tropical waters.

scholarly journals Perception of Local Communities Towards the Conservation Terubok

2019 ◽  
Vol 9 (3) ◽  
pp. 143
Author(s):  
Nur Athirah Bakeri ◽  
Dayang Affizzah Awang Marikan ◽  
Amin Mahir Abdullah
Keyword(s):  
Positive Attitude ◽  
Local Community ◽  
Government Intervention ◽  
Economic Value ◽  
Local Communities ◽  
Public Understanding ◽  
The Past ◽  
Almost All ◽  
The Impact ◽  
Conservation Interventions

Terubok is one of the famous, important commercially fish in Malaysia and has high economic value which only can be found in Sarawak rivers. However, this species has been threatened in the past 15 years due to heavy exploitation. Hence, this study was done to examine the perceptions of local in conserving and sustaining the terubok population. An attitudinal study is increasingly being adopted as tools for evaluating public understanding, acceptance and the impact of conservation interventions. This study examines the perception and views of local community towards the dynamic resources, government intervention, unique features and livelihood sustainability which acts as a basis on conserving terubok. The findings of these studies show that almost all of the respondents show a highly positive attitude towards conserving terubok. Local community are really well aware with the importance of terubok. Hence, this study has proof that the local community has a positive attitude towards conserving terubok.

scholarly journals High-Level Congruence of Myrionecta rubra Prey and Dinophysis Species Plastid Identities as Revealed by Genetic Analyses of Isolates from Japanese Coastal Waters

2010 ◽  
Vol 76 (9) ◽  
pp. 2791-2798 ◽  
Author(s):  
Goh Nishitani ◽  
Satoshi Nagai ◽  
Katsuhisa Baba ◽  
Susumu Kiyokawa ◽  
Yuki Kosaka ◽  
...  
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Coastal Waters ◽  
Primary Source ◽  
18S Rrna Gene ◽  
Rrna Gene ◽  
Gene Sequences ◽  
Myrionecta Rubra ◽  
High Level ◽  
Almost All

ABSTRACT We analyzed cryptophyte nucleomorph 18S rRNA gene sequences retained in natural Myrionecta rubra cells and plastid 16S rRNA gene and psbA sequences retained in natural cells of several Dinophysis species collected from Japanese coastal waters. A total of 715 nucleomorph sequences obtained from 134 M. rubra cells and 564 plastid 16S rRNA gene and 355 psbA sequences from 71 Dinophysis cells were determined. Almost all sequences in M. rubra and Dinophysis spp. were identical to those of Teleaulax amphioxeia, suggesting that M. rubra in Japanese coastal waters preferentially ingest T. amphioxeia. The remaining sequences were closely related to those of Geminigera cryophila and Teleaulax acuta. Interestingly, 37 plastid 16S rRNA gene sequences, which were different from T. amphioxeia and amplified from Dinophysis acuminata and Dinophysis norvegica cells, were identical to the sequence of a D. acuminata cell found in the Greenland Sea, suggesting that a widely distributed and unknown cryptophyte species is also preyed upon by M. rubra and subsequently sequestered by Dinophysis. To confirm the reliability of molecular identification of the cryptophyte Teleaulax species detected from M. rubra and Dinophysis cells, the nucleomorph and plastid genes of Teleaulax species isolated from seawaters were also analyzed. Of 19 isolates, 16 and 3 clonal strains were identified as T. amphioxeia and T. acuta, respectively, and no sequence variation was confirmed within species. T. amphioxeia is probably the primary source of prey for M. rubra in Japanese coastal waters. An unknown cryptophyte may serve as an additional source, depending on localities and seasons.

The contribution of heterotrophic nanoflagellate grazing towards bacterial mortality in tropical waters: comparing estuaries and coastal ecosystems

2011 ◽  
Vol 62 (4) ◽  
pp. 414 ◽  
Author(s):  
Chui Wei Bong ◽  
Choon Weng Lee
Keyword(s):  
Coastal Waters ◽  
Bacterial Production ◽  
Trophic Status ◽  
Bacterial Abundance ◽  
Temperature Optimum ◽  
Viral Lysis ◽  
Tropical Waters ◽  
Order Of Magnitude ◽  
Heterotrophic Nanoflagellate ◽  
Straits Of Malacca

Heterotrophic nanoflagellate (HNF) grazing depends on both temperature and trophic status of an ecosystem. As most microbes already function at their temperature optimum in tropical waters, we hypothesised that HNF grazing rates would be higher in more productive sites such as estuaries than in less productive areas such as coastal waters. We sampled two estuaries and three coastal sites along the Straits of Malacca and the South China Sea near the Malaysia Peninsula. Bacterial abundance ranged 0.9–6.3 × 106 cells mL–1, whereas HNF abundance ranged 1.8–10.1 ×103 cells mL–1. Bacterial production ranged 1.1–12.7 × 105 cells mL–1 h–1, whereas HNF grazing rates were an order of magnitude lower at 1.0–78.5 × 104 cells mL–1 h–1. Bacterial abundance, net bacterial production and HNF grazing rates were higher in estuaries than coastal waters but HNF abundance did not differ between the two areas. Across all stations, HNF grazing rates increased with bacterial production, and accounted for ~33% of bacterial production. Our results suggest that in the tropical waters studied, there was a bacterial production–grazing imbalance. Other loss factors such as viral lysis, sedimentation or the presence of benthic filter feeders could account for this imbalance.

scholarly journals Records of alien marine species in the shallow coastal waters of Chios Island (2009)

2009 ◽  
Vol 10 (2) ◽  
pp. 99 ◽  
Author(s):  
S. KATSANEVAKIS ◽  
K. TSIAMIS
Keyword(s):  
Alien Species ◽  
Coastal Waters ◽  
Aegean Sea ◽  
Marine Species ◽  
Benthic Species ◽  
Caulerpa Racemosa ◽  
Asparagopsis Taxiformis ◽  
Halophila Stipulacea ◽  
Percnon Gibbesi ◽  
Marine Alien Species

The shallow coastline of Chios Island was surveyed for the presence of any alien marine benthic species, during August 2009. Fourteen randomly selected sites were surveyed by snorkeling during standardized one-hour transects at depths between 0 and 10 m, and the presence of all identified alien benthic species was recorded. Six alien species were identified: Asparagopsis taxiformis, Caulerpa racemosa var. cylindracea, Stypopodium schimperi, Halophila stipulacea, Percnon gibbesi, and Siganus luridus. The green alga C. racemosa var. cylindracea was found in high densities in all the surveyed sites and was characterized as invasive in the island. The brown alga S. schimperi, the crab P. gibbesi, and the fish S. luridussustain established populations in the area. For three of the recorded marine alien species (S. schimperi, P. gibbesi, and S. luridus),Chios Island seems to be the northernmost margin of their geographical range in the Aegean Sea.

scholarly journals Research of parasites with zoonotic potential for humans in skipjack tuna (Katsuwonus pelamis)

2021 ◽  
Vol 17 (8) ◽  
Author(s):  
Clarissa Maia de Aquino ◽  
Gracienhe Gomes dos Santos ◽  
Maur´ício Laterça Martins ◽  
Vildes Maria Scussel
Keyword(s):  
Economic Value ◽  
International Markets ◽  
Mechanical Action ◽  
Fish Parasites ◽  
Zoonotic Potential ◽  
Skipjack Tuna ◽  
Internal Organs ◽  
Katsuwonus Pelamis ◽  
Tropical Waters ◽  
Zoonotic Parasites

The skipjack tuna (Katsuwonus pelamis) is commonly found in the tropical waters of the oceans. It is a fishing resource of high economic value and available for national and international markets. Therefore, it is important to know the fish parasites for a correct sanitary inspection, as the pathogenesis in humans can occur through spoliative, toxic or mechanical action. This study aimed to identify the zoonotic parasitic fauna that infects the beautiful-striped using morphological methods. A total of 06 samples were analyzed. The fish were necropsied for parasitological evaluation of the musculature and internal organs. The samples were visually inspected and the structures with morphology combining with parasitic shapes were analyzed both in stereoscopic and microscope. The parasites found were fixed in 70% alcohol for later identification. All samples showed the presence of zoonotic parasites for humans. Two genera of zoonotic parasites have been found for humans that have beautiful tuna as their hosts, namely Anisakis sp. (Nematoda) and Trypanorhyncha (Eucestoda). A 100% of the infections occurred in the muscles and 66.6% in the liver. The results reinforced the importance of inspection by responsible organisms on the importance of evisceration as quickly as possible to avoid migration of larvae to the muscle.

scholarly journals POTENSI DAN DAYA DUKUNG LESTARI TEGAKAN AREN DI DESA LANNE

PERENNIAL ◽  
2019 ◽  
Vol 15 (2) ◽  
pp. 93
Author(s):  
Dewi Indasary ◽  
Nurul Hikmah Melilani ◽  
Muhammad Ramdhan Rachmat ◽  
Suhasman Suhasman
Keyword(s):  
Research Method ◽  
Economic Value ◽  
Male Flower ◽  
Brown Sugar ◽  
Palm Trees ◽  
South Sulawesi ◽  
The People ◽  
Financial Benefits ◽  
Palm Sugar ◽  
Almost All

Palm trees have high economic potential because almost all parties can provide financial benefits. But of all palm products, the palm sap that comes from the male flower arm as an ingredient for the production of brown sugar is the greatest economic value. However, there are some people who prefer to cut palm trees for cultural purposes instead of properly handling them to be used as brown sugar. This research aims to analyze the carrying capacity and potential of palm trees in Lanne Village. The location of this investigation was carried out in Lanne Village, Tondong Tallasa District, Pangkajene and Kepulauan Regency, South Sulawesi Province. The location of the sugar palm administrators is in two villages, namely, Manjalling and Mariololo. The research method used is a qualitative research method that uses inventory, observation and interview techniques. The results obtained are that for now the people of Lanne do not comply with the capacity of sustainable cargo. The presence of sugar palm is now relatively minor. Therefore, to restore the glory of the sugar palm sugar population must be added

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