استفاده از آنالیز شکل اتولیت ساجیتا به منظور تفکیک چهار گونه از گیش ماهیان (Carangidae) خلیج فارس

نوع مقاله : ریخت شناسی

نویسندگان

1 گروه زیست شناسی دریا، دانشگاه آزاد اسلامی واحد علوم وتحقیقات، تهران، ایران، صندوق پستی: 775-14515

2 سازمان تحقیقات آموزش و ترویج کشاورزی، مؤسسه تحقیقات علوم شیلاتی کشور، تهران، صندوق پستی: 149-14965

چکیده

حاشیة اتولیت چهار گونه از ماهیان متعلق به خانوادة گیش ماهیان Carangoides coeruleopinnatus،Carangoides chrysophrys، Carangoides malabaricus و Megalaspis cordyla در آب‌های خلیج فارس به ­منظور تفکیک‌پذیری بررسی شد. پس از تصویربرداری از اتولیت‌ها، حاشیه‌ها به کمک تحلیل فوریة بیضوی و نرم‌افزار Shape مورد بررسی قرار گرفت. کد زنجیری، هارمونیک‌ها و ضرایب فوریة بیضوی برای هر نمونه به ­دست آمد. توسط مقادیر ویژه، بازسازی میانگین حاشیة اتولیت انجام شد. شکل اتولیت از طریق توصیف گرهای فوریة بیضوی مربوط به 20‌ هارمونیک و به ­وسیلة شش شاخص شکلی مورد توصیف قرار گرفت. این چهار گونه با استفاده از شاخص‌های شکلی (72/2 %)، ضرایب فوریة بیضوی (73/7 %) یا ترکیبی از دو روش (72/2 %) به شکل کاملاً موفقیت­ آمیزی متمایز شدند. در تحلیل تشخیصی با استفاده از شاخص‌های شکلی به تنهایی، تفکیک مناسبی در بین گونه‌ها انجام نگرفت. نتایج حاصل از تجزیه مؤلفه‌های اصلی نیز نشانگر این موضوع است که درصد واریانس در مؤلفه‌های اصلی اول هرگونه بیش ­ترین میزان را داشته و مؤلفه‌های اصلی به­ ترتیب در حال کاهش می‌باشند. ولی واریانس تجمعی بیانگر این مطلب است که شکل تخمین زده شده توسط تبدیل فوریة بیضوی تا چه میزان قادر به توضیح تصویر گونة مربوطه است. نتایج  مطالعه حاضر نشان می‌دهد که ترکیب اندازه بر مبنای توصیف‌ گرهای شکلی و توصیف گرهای فوریه بیضوی ابزاری سودمند در تفکیک 4 گونه از گیش ماهیان خلیج فارس است.

کلیدواژه‌ها

عنوان مقاله [English]

The Use of Sagittal Otolith Shape Analysis in Discriminating of Four Carangidae Species from the Persian Gulf

نویسندگان [English]

  • Anahita Fashandi 1
  • Tooraj Valinassab 2
  • Farhad Kaymaram 2
  • Seyed Mohammad Reza Fatemi 1
1 Department of Biology, Islamic Azad University, Science and Research Branch, Tehran, Iran, POBox: 775-14515
2 Agricultural Research and Training Organization, Fisheries Research Institute of Iran, Tehran, POBox: 149-14965
چکیده [English]

The sagittal otolith’s contours were studied to discriminate between four Carangid species including Carangoides coeruleopinnatus, Carangoides chrysophrys, Carangoides malabaricus, and Megalaspis cordyla from the Persian Gulf. After preparing Sagittal otolith photos, their contours were analysed by elliptic Fourier analysis using Shape software. The chain codes, harmonics and elliptic Fourier coefficients were obtained for each sample. The mean otolith contours values were rebuilt by specific values. The shapes of otoliths were studied by elliptic Fourier descriptors of 20 harmonics and 6 shape indices. These four species were discriminated successfully using shape indices (72.2%), elliptic Fourier coefficients (73.7%), or combination of both techniques (72.2%). No classification success was achieved in discriminant analysis using merely shape indices. The results of principal components analysis (PCA) also indicated that the percentage of variance in the first principal component of each species showed maximum value and the principal components were reduced respectively. However, cumulative variance showed how the estimated shape by elliptical Fourier transformation can represent the corresponded species shape. The results of this study show that combining the size according to shape descriptors and EFD is a suitable tool to distinguish of four Carangid species.

کلیدواژه‌ها [English]

  • Carangidae
  • Otolith
  • Elliptic Fourier Analysis
  • Chain code
  • Persian Gulf

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فصلنامه محیط زیست جانوری
دوره 10، شماره 1
فروردین 1397
صفحه 167-178

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