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PENDEKATAN POLA PEREMAJAAN DAN LAJU EKSPLOITASI IKAN LOUHAN UNTUK PENGENDALIAN IKAN ASING INVASIF DI DANAU MATANO, SULAWESI SELATAN
Full text linkIkan louhan tergolong jenis ikan hibrid (sehingga tidak dapat ditentukan nama ilmiahnya) dari famili Cichlidae yang terindikasi sebagai ikan asing invasif di Danau Matano. Keberadaan ikan tersebut di Danau Matano perlu dikaji dan dikendalikan untuk menjaga kelestarian keanekaragaman hayati jenis ikan endemik. Penelitian ini bertujuan untuk menganalisis pola peremajaan dan laju eksploitasi ikan louhan sebagai pendekatan dalam pengendalian ikan asing invasif di Danau Matano, Sulawesi Selatan. Analisis data dilakukan terhadap 2.931 ekor ikan louhan yang ditangkap menggunakan jaring insang percobaan berbagai ukuran mata jaring dilengkapi data enumerator secara bulanan pada bulan Februari hingga November 2016 dengan bantuan perangkat lunak FiSAT II. Hasil analisis menunjukkan bahwa pola pertumbuhan ikan louhan di Danau Matano bersifat alometrik positif. Pertumbuhan mengikuti persamaan Lt=23,67[1-e0,41(t+0,4281)]. Umur maksimum (tmax) mencapai 7,32 tahun dengan performa pertumbuhan (Ø’) sebesar 2,36. Laju mortalitas total (Z) tahunan didapatkan sebesar 1,46 tahun-1. Laju mortalitas penangkapan tahunan (F = 0,38 tahun-1) lebih rendah daripada laju mortalitas alami tahunan (M = 1,08 tahun-1). Laju eksploitasi (E) ikan louhan di Danau Matano hanya sebesar 0,26 tahun-1 dimana menunjukkan bahwa upaya pemanfaatannya masih sangat rendah. Pola peremajaan terjadi dua kali dalam setahun, yaitu pada Mei (16,19%) dan Oktober (6,05%). Upaya pengendalian ikan louhan sebagai ikan invasif di Danau Matano perlu dilakukan pada saat puncak peremajaan tertinggi secara berkesinambungan disertai peningkatan laju eksploitasi e” 48% dari upaya yang ada, terutama pada April-Mei dan September-Oktober di daerah litoral perairan danau.Flowerhorn cichlid is classified as hybrid species (so that the scientific name can’t be determined) from Cichlidae which indicated as invasive alien fish in Lake Matano. The existence of flowerhorn in Lake Matano need to be assessed and controlled to preserve the biodiversity of endemic fish species. This research aims to assess recruitment pattern and utlization status of flowerhorn cichlid for controlling of invasive alien species at Lake Matano, South Sulawesi. Data analysis was carried out on 2,931 flowerhorn Cichlid caught using experimental gillnets of various mesh sizes included enumerators data which recorded monthly from February to November 2016 using FiSAT II software. The analysis resulted the growth pattern of flowerhorn cichlid in Matano louhan Lake was positive allometric. The growth equation of flowerhorn cichlid was Lt=23.67[1-e0,4(t+0.4281)]. Longevity (tmax) attained 7.32 years with growth performance (Ø’) was 2.36. The annual total mortality rate (Z) obtained 1.46 years-1. The annual fishing mortality rate (F = 0.38 years-1) is lower than the annual natural mortality rate (M = 1.08 years-1). Exploitation rate (E) of flowerhorn cichlid in Lake Matano only 0.26 years-1, which was indicated under exploitation. Recruitment pattern occurs twice a year, in May (16.19%) and October (6.05%). The eradication efforts to control population of flowerhorn cichlid as invasive alien species in Lake Matano needs to be done at the peak of recruitment and also increased exploitation rate about e” 48% of existing efforts, especially on April-May and September-October in the littoral area of Lake Matano
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
ASPEK BIOLOGI, SEBARAN, DAN DAERAH ASUHAN UDANG Metapenaeus dobsoni (MIERS, 1878) DI PERAIRAN ACEH TIMUR
No full textUdang Metapenaeus dobsoni (Miers 1878) atau dikenal sebagai udang halus/kapur merupakan jenis udang penaeid yang dominan tertangkap di pesisir perairan Aceh Timur. Penelitian yang dilaksanakan pada April dan September tahun 2014-2015 serta April 2016 di perairan Aceh Timur bertujuan untuk mengkaji beberapa aspek biologi, kepadatan stok dan sebarannya, serta menduga daerah asuhan udang Metapenaeus dobsoni yang berguna sebagai bahan masukan untuk pengelolaannya. Aspek biologi udang yang dianalisis meliputi hubungan panjang-berat, kebiasaan makanan, dan ukuran pertama kali matang gonad (Lm50). Pengambilan sampel untuk mengetahui sebaran Metapenaeus dobsoni dilakukan menggunakan metode sapuan dengan alat tangkap mini beam trawl di 25 stasiun yang mewakili daerah estuaria, sungai, dan pesisir. Udang Metapenaeus dobsoni memiliki pola pertumbuhan alometrik negatif dengan tingkat trofik sebagai detritivora. Ukuran pertama kali matang gonad dicapai pada ukuran panjang karapas 1,3 cm. Udang Metapenaeus dobsoni tergolong udang kosmopolit dan euryhaline, sehingga menyebar secara luas di sepanjang perairan Aceh Timur. Kepadatan stok udang Metapenaeus dobsoni pada fase juvenil dan udang muda banyak ditemukan di daerah sungai yang ditumbuhi mangrove dengan salinitas di dasar perairan yang relatif rendah dan substrat dominan berupa lumpur (fraksi debu dan liat). Di daerah muara (kuala) dan pesisir dengan substrat dominan pasir dan salinitas cukup tinggi banyak ditemukan udang pada fase muda hingga dewasa. Daerah asuhan utama udang Metapenaeus dobsoni terdapat di Kuala Arakundo.Metapenaeus dobsoni (Miers 1878) shrimp, locally called “udang halus/kapur”, is a dominant penaeid shrimp caught in the coastal waters of East Aceh. The research was conducted in April and September of 2014-2015 and April 2016 in East Aceh waters aims to assess some biological aspects, distribution, stock density, and nursery ground of the shrimp management. Analysis on biological aspects include length-weight relationship, food habits, and carapace length at first maturity (Lm50). Sampling to determine distribution of the species was based on swept area method using mini beam trawl. Total 25 sampling sites selected representing estuary, river, and coastal area, respectively. Metapenaeus dobsoni has negative allometric growth pattern with trophic level as detritivore. Size at first maturity the carapace length of 1.3 cm. Stock density of Metapenaeus dobsoni in the juvenile and adolescent phase commonly found in mangroves-covered river area with relatively low salinity at the bottom waters and have mud as dominant substrate (fraction of silt and clay). The adolescent to adult phase found in the estuary (river mouth) and coastal area with sand as dominant substrate and high salinity waters. The main nursery grounds of Metapenaeus dobsoni found in Kuala Arakundo.</jats:p
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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