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Keberadaan Hutan Mangrove Kuala Langsa terhadap Komunitas Zooplankton
No full textHutan Mangrove merupakan ekosistem transisi yang menghubungkan ekosistem darat dengan laut dan memegang peranan penting dalam mendukung produktivitas laut yang berdekatan. Sekalipun kawasan ini hanya 10% bagian laut tetapi menampung hampir 90% kehidupan laut oleh karena itu ekologi daerah ini harus dipelajari secara mendalam dan secepat mungkin, karena memasuki PJP II banyak kegiatan pembangunan yang dilaksanakan di sepanjang kawasan ini. Hampir semua jenis tumbuhan yang membentuk hutan bakau di Indonesia sudah diketahui, tetapi segi-segi lainnya seperti produktivitas, dinamika ekosistem, variasi komposisi jenis khususnya Zooplankton belum diketahui. Kabupaten Aceh Timur memiliki areal hutan Mangrove terluas di propinsi D.I. Aceh, yakni sekitar 46.718 ha. Akan tetapi penelitian-penelitian secara mendalam khususnya tentang Zooplankton di ekosistem Mangrove belum dilakukan. Permasalahan yang akan diteliti dalam penelitian ini adalah bagaimana tingkat keanekaragaman vegetasi, tingkat keanekaragaman Zooplankton dan hubungan keduanya, serta kondisi faktor fisik-kimiawi air kawasan Hutan Mangrove Kuala Langsa. Penelitian ini dapat dijadikan informasi mengenai kajian ekologi lapangan khususnya tentang keanekaragaman Zooplankton pada suatu ekosistem hutan mangrove dan sebagai suatu masukan bagi upaya pengelolaan dan konservasi suber daya alam wilayah pesisir khususnya mengenai keanekaragaman dan kekayaan Zooplankton penyusun ekosistem mangrove. Penelitian dilakukan di kawasan hutan Mangrove Kuala Langsa kabupaten Aceh Timur dengan luas 20,8 hektar pada bulan Juli s.d November 1999. Parameter yang diukur dalam penelitian ini adalah kerapatan, kehadiran dominansi vegetasi, kepadatan zooplankton, suhu air, salinitas, kecerahan, kedalaman, pH air, dan kadar oksigen terlarut dalam air (DO). Hubungan antara keanekaragaman vegetasi terhadap keanekaragaman Zooplankton dianalisis dengan metode regresi sederhana, dan untuk menganalisis faktor fisik-kimiawi air yang paling berpengaruh terhadap keanekaragaman Zooplankton dipergunakan analisis regresi ganda bertahap. Data diolah dengan komputer menggunakan SPSS for Windows 3.1 Versi 6.0. Hasil pengamatan terhadap vegetasi hutan Mangrove Kuala Langsa di 3 lokasi (12 stasiun) ditemukan 15 jenis tumbuhan, mencakup 2 kelas yaitu Magnoliopsida dan Liliopsida. Hasil analisis vegetasi menunjukkan indek keananekaragaman vegetasi berada pada tingkat sedang (H'=3,024). Jenis Nipah (Nipa fructicans Thunb.) memiliki nilai kepentingan paling besar yaitu97,42, diikuti oleh jenis Bakau Minyak (Rhizophora conjugata L.) sebesar 65,17, dan Lenggadai (Bruguiera parviflora RaxG.) sebesar 29,125. Pengamatan terhadap sampel air kawasan hutan Mangrove Kuala Langsa pada 12 stasiun dijumpai 25 jenis zooplankton. Semua jenis tersebut dapat digolongkan ke dalam 3 filum yaitu Protozoa, Insekta dan Coelentrata. Hasil analisis kenanekaragaman zooplankton menunjukkan indeks keanekaragamannya pada tingkat sedang (H'=4,6424). Jenis Phyllomitus amilophagus memiliki nilai kepentingan paling besar yaitu 0,046, kemudian diikuti oleh jenis Acanthocytis turfacea dan Centropyxis stellate sebesar 0,044. Hasil analisis regresi sederhana menunjukkan 83,76% variasi dari keanekaragaman zooplankton dapat ditentukan oleh variabel keanekaragaman vegetasi (R square = 0,8376). Hasil sidik ragam regresi menunjukkan F-hitung =51,59309, dan pada tingkat kepercayaan 95% dengan dk1 = 1 dan dk2 = 10 diperoleh F-tabel(1,10;0,05) = 4,96. Oleh karena itu keanekaragaman vegetasi berperan dalam memprediksi nilai variabel keanekaragaman zooplankton di kawasan hutan Manrove Kuala Langsa. Hasil analisis data dengan regresi ganda bertahap antara masing-masing faktor fisik-kirniawi dengan indek keanekaragaman zooplankton, menunjukkan bahwa hanya kedelaman. kecepatan erus, kecerehan, nitrat dan salinitas berpengaruh secara nyata terhadap keanekaragaman zooplankton dengan taraf kepercayaan 95% apabila berdiri sendiri-sendiri, sedangkan 4 faktor lain, yaitu suhu, pH, DO dan nitrit tidak berpengaruh secara nyata. Selanjutnya apabila semua faktor fisik-kimiawi disatukan dan dihubungkan dengan keanekaragaman zooplankton, ternyata hanya salinitas saja yang berpengaruh secara nyata terhadap keanekaragaman zooplankton dengan taraf kepercayaan 95%. Beberapa aspek penting yang muncul untuk diteliti lebih lanjut adalah penelitian lebih lanjut tentang komunitas phytoplankton, populasi kelompok vertebrata yang mendiami kawasan hutan mangrove kabupaten Dati II Aceh Timur, dan parameter lingkungan lain (suplai air tawar, pasokan nutrien dan stabilitas subtrat), serta penelitian tentang permodelan dalam rangka pengelolaan dan manajemen kawasan pesisir dan lautan.135 HalamanTesis Magiste
Kesan Kaedah Koperatif Bersama Persekitaran Pembelajaran Atas Talian Asinkroni Terhadap Kemahiran Penaakulan Saintifik, Prestasi Pembelajaran Dan Penglibatan Pelajar
Full text linkPenyelidikan ini mengkaji kesan-kesan kaedah koperatif bersama persekitaran pembelajaran atas talian asinkroni terhadap kemahiran penaakulan saintifik, penguasaan isi pelajaran dan penglibatan konstruktivis pelajar universiti tahun pertama dalam Biologi yang sedia diajar secara blended learning. Kajian ini menggunakan reka bentuk faktorial 2 x 2 dengan ujian pasca. Faktor pertama ialah kaedah pengajaran, iaitu, blended learning bersama teknik jigsaw atas talian asinkroni dan blended learning bersama teknik pembelajaran individu atas talian, manakala faktor kedua ialah pencapaian pelajar, iaitu, tinggi dan rendah berdasarkan skor Ujian Kebangsaan Indonesia. Pemboleh ubah bersandar terdiri dari tiga elemen, iaitu kemahiran pemikiran saintifik di dalam bentuk penaakulan Empirical-Inductive (EI) yang diukur melalui item-item ujian aneka pilihan dan penaakulan Hypothetical-Deductive (HD) yang diukur dengan item-item ujian aneka pilihan serta ujian esei, penguasaan isi pelajaran yang diukur melalui ujian topikal yang ditadbir di akhir kajian, dan tahap penglibatan konstruktivis pelajar yang diukur melalui satu set soal selidik.
This study investigated the effects of an asynchronous online cooperative learning technique on performance in scientific reasoning and content mastery as well as constructivist learning engagement among first year students currently engaged in blended learning in Biology. The 2 x 2 factorial design with post-tests only was employed for the study. The first factor was the instructional method, namely, blended learning with asynchronous online jigsaw technique and blended learning with online individual learning technique, while the second factor was student achievement as measured by the Indonesian National Examination scores. The dependent variables were scientific thinking skills in the forms of Empirical-Inductive (EI) reasoning that was measured using multiple-choice items and Hypothetical-Deductive (HD) reasoning that was measured using multiple-choice and essay questions, as well as mastery of lesson content that was measured through a topical test administered at the end of the treatment, and the level of constructivist learning engagement in the course that was measured using a questionnaire
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
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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