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This service is more advanced with JavaScript available, learn more at http://activatejavascript.orgShort-term consequences of lowhead dam removal for fish assemblag...: Ingenta Connect
Volume 21, Numbers 2-3
Authors: Dorobek, A&Sullivan, S.Mažeika P.;&Kautza, Adam
Source: , Volume 21, Numbers 2-3, November 2015, pp. 125-139(15)Publisher:
Lowhead or run-of-river dams, which can have significant impacts on river ecosystems, are common on rivers around the world. Although lowhead dam removal is becoming an increasingly viable component of river restoration projects, the quantitative effects of lowhead dam removal on river
ecosystems are not well described. In this study, we investigated the short-term (< 2 years) effects of two lowhead dam removals on fish assemblage diversity and structure in the Scioto and Olentangy Rivers of urban Columbus, Ohio (USA). Non-metric multidimensional scaling (NMS) and analysis
of similarities (ANOSIM) revealed that upstream assemblage composition shifted significantly from before to after dam removal (ANOSIM; R = 0.714, p
= 0.001). Likewise, assemblage shifts were signifi cant between years 1 and 2 at Olentangy River reaches both upstream and downstream
of dam removal (ANOSIM; R = 0.136, p = 0.019). Shifts in fish diversity metrics were accompanied by changes in relative abundances of taxa within feeding guilds. For example, reductions in species richness and diversity at upstream reaches were accompanied by the loss of large-bodied
omnivorous species. In the second year following dam removal, a significant increase in assemblage diversity at an upstream restored reach (including colonization by sensitive Etheostoma
species) was accompanied by an increase in insectivores and a reduction of larger-bodied omnivores
and carnivores. Overall, our results suggest that dam removal may act as a pulse disturbance with quantitative short-term impacts on fish assemblages. Fish responses to dam removal likely operate along a temporal trajectory wherein short-term responses will be critical in shaping longer-term
responses.
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Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in.Toleransi dan aktiviti sosial anak-anak
Jasmi, Kamarul Azmi and Razi, Mohd. Rafeez and Shidun, Mohamad Shafiq
Toleransi dan aktiviti sosial anak-anak.
In: Seminar Pertama Sains,Teknologi, dan Manusia , 22 September 2012, Marbawy Hall, Faculty of Islamic Civilization, Universiti Teknologi Malaysia.
2MBAbstractApabila bercakap mengenai masa hadapan, sudah semestinya pelbagai perkara yang akan kita gambarkan. Baik mahupun buruk, sudah semestinya segala-galanya menjadi persoalan. Perkara paling utama yang menjadi topik perbincangan dalam kalangan manusia ialah soal pemimpin masa hadapan kelak. Dari aspek ini, kita sudah boleh lihat apa yang akan berlaku kelak. Oleh itu, Ibu bapa, guru-guru dan orang dewasa perlu bertindak sebaiknya dalam mendidik anak-anak (Saat Sulaiman, 2008: 43). Kanak-kanak didefinisikan sebagai seorang yang digelar budak atau anak kecil yang dimaksudkan sebagai manusia muda iaitu yang belum mencapai kematangan (baligh) serta belum tahu membuat keputusan dengan sendirinya. Melalui definisi, kita boleh membuat keputusan bahawasanya anak-anak atau kanak-kanak ini memerlukan pembimbing. Untuk berhadapan dengan masa hadapan kelak, ianya bukan perkara yang mudah. Oleh itu, langkah-langkah terperinci perlu dilaksanakan untuk memastikan kehidupan anak di masa hadapan lebih terjamin (H. Mazahein, ). Topik yang kami pilih ini lebih tertumpu kepada isu toleransi dan aktivisme sosial. Kedua-dua aspek ini amat penting untuk diaplikasikan oleh anak-anak di masa hadapan kelak. Antaranya, menjadi pemimpin yang tidak mementingkan diri, bertoleransi, membantu orangyang berada dalam keadaan kesusahan dan sebagainya. Oleh itu, Ibu bapa, guru-guru dan orang dewasa akan menjadi agen atau tonggak utama dalam merealisasikan aspek ini dalam diri anak-anak.&#13;
Item Type:Conference or Workshop Item (Paper)Subjects:Divisions:ID Code:40097Deposited By:
Dr. Kamarul Azmi Jasmi
Deposited On:10 Aug Last Modified:12 Aug Repository Staff Only:
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