نتایج جستجو برای: abundance
تعداد نتایج: 80674 فیلتر نتایج به سال:
Introduction: Flies are able to mechanically transmit many pathogenic agents due to their close relationship with humans. Identification and species determination of flies for understanding of their current status and planning for their control, as well as considering the important role of flies in the ecosystem and their biological functions in biological studies, is essential. The purpose of ...
the aim of this study was to estimate the influence of selected environmental parameters on the fish larval distribution and abundance between october 2012 and september 2013 in the mangrove estuarine area of marudu bay, sabah, malaysia. fish larvae samples were collected monthly using plankton net of 350 mm of mesh size with a mouth opening of 40.5 cm in diameter through 20 min surface tows. f...
statistical studies on palynology contents of late cretaceous to paleocene age gurpi formation in a surface section in zagros basin,sw iran indicate changes in abundance, species diversity, ratio of spiniferites to cyclonephelium (s/c), palynological marine index(pmi) values and organic facies. these palynological variations clearly reflect fluctuations in relative sea-level and depositionalenv...
The primary prey of humpback whales in the southwestern Gulf Maine is sand lance. Despite this established relationship, we lack models to further understand influence lance on or predict abundance distribution response climate-related changes distribution. We used a subset long-term standardized survey data (2013–2019) from Stellwagen Bank National Marine Sanctuary and Bayesian hierarchical mo...
فعالیت های آبزی پروری امروزه در دنیا اهمیت فراوانی پیدا کرده اند، لذا به موازات این فعالیت ها مطالعه اثرات آنها، بر اکوسیستم دریا ضروری بنظر می رسد. این مطالعه به منظور بررسی اثرات احتمالی قفس های پرورش ماهیان دریایی خور غزاله واقع در خور موسی در منطقه خوزستان (شمال خلیج فارس)، بر روی جوامع بنتیک بعنوان شاخص آلودگی و استرس و ارزیابی وضعیت سلامت محیط با استفاده از شاخص های زیستی انجام شده است. ن...
phytoplankton communities play a significant role in the oceanic biological pump by forming the base of the trophic structure. increase in nutrients loading affects spatial and temporal distribution of phytoplankton. this study examined the phytoplankton community structure and ecological indices in relation to nutrients dynamics in both estuarine and oceanic areas of ramisi-vanga systems along...
spiders are one of the most abundant invertebrates in terrestrial ecosystems that have a good potential to pest control in crops. species richness and abundance of spiders and the effects of different agricultural practices on these predators were studied in winter wheat fields in shirvan, mashhad and gonabad, cities in northeast of iran. in each region, high and low input fields of winter whea...
1. The positive abundance-occupancy and abundance-variance relationships are two of the most widely documented patterns in population and community ecology. 2. Recently, a general model has been proposed linking the mean abundance, the spatial variance in abundance, and the occupancy of species. A striking feature of this model is that it consists explicitly of the three variables abundance, va...
The aim of the present study was to examine the effect of temporal variations and tidal phases on frequency of Upeneus doriae (Günther,1869) in the coast of Bandar Abbas. Sampling was performed in September 2016 to April 2017. During the lunar calendar months, the highest abundance of U. doriae was observed in Muharram (with147/15 ± 144/37 n.G-1.day-1 ), and lowest was in Rabi Ul Awal (with 3/...
Crude oils and source rocks from the northern and offshore Niger Delta basin, Nigeria, have been characterized by gas chromatography-mass spectrometry in terms of their origin and thermal maturity based on the distribution of chrysene and its derivatives. The crude oils and source rocks were characterized by the dominance of chrysene over benzo[a]anthracene. 3-methylchrysene predominated over o...
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