نتایج جستجو برای: bromus danthoniae

تعداد نتایج: 1399  

ژورنال: :مجله گیاهشناسی ایران 2000
حسین میرزایی ندوشن علی رضا زبرجدی قاسم کریم زاده

دوازده جمعیت از گونه bromus tomentellus که از نقاط مختلف ایران جمع آوری شده بود مورد اندازه گیریهای مختلف کروموزومی قرار گرفت. داده های حاصل از این اندازه گیری ها ابتدا در قالب طرح آماری فاکتوریل مورد تجزیه و تحلیل قرار گرفته و پس از حصول اطمینان از تفاوت های معنی دار آماری بین جمعیتها و نیز کروموزوم ها، اطلاعات حاصل مورد تجزیه و تحلیل های تکمیلی قرار گرفتند. جمعیتها از نظر ابعاد مختلف کروموزوم...

Journal: :Canadian Journal of Plant Science 1986

2018

Stampfli A. 1992. Effects of mowing and removing litter on reproductive shoot modules of some plant species in abandoned meadows on Monte San Giorgio. Bot. Helv. 102: 85-92. Reproductive shoot modules have been counted in a permanent plot experiment on Monte San Giorgio (Southern Switzerland) since 1988. The 8 species presented here, including the dominant grass (Molinia arundinacea) and seven ...

Journal: :Ecology 2016
Michelle E Afkhami Sharon Y Strauss

Understanding community dynamics and processes, such as the factors that generate and maintain biodiversity, drive succession, and affect invasion susceptibility, is a central goal in ecology and evolution. While most studies of how species interactions affect communities have focused on highly visible macroorganisms, we show that mutualistic microfungal endophytes have community-level effects ...

Journal: :Biology letters 2012
Culum Brown Martin P Garwood Jane E Williamson

Signals in intraspecific communication should be inherently honest; otherwise the system is prone to collapse. Theory predicts, however, that honest signalling systems are susceptible to invasion by cheats, the extent of which is largely mediated by fear of reprisal. Cuttlefish facultatively change their shape and colour, an ability that evolved to avoid predators and capture prey. Here, we sho...

Journal: :American journal of botany 2003
Deborah L Clark Mark V Wilson

After dispersal, seeds can germinate and establish as seedlings, persist as seeds, or die. Knowledge of these three seed fates is crucial for understanding the abundance and distribution of plant populations and ultimately, community composition and diversity. Few studies, however, have simultaneously measured these fates, while also examining the factors causing mortality. The goal of this res...

2018
Giorgio

Stampfli A. 1992. Effects of mowing and removing litter on reproductive shoot modules of some plant species in abandoned meadows on Monte San Giorgio. Bot. Helv. 102: 85-92. Reproductive shoot modules have been counted in a permanent plot experiment on Monte San Giorgio (Southern Switzerland) since 1988. The 8 species presented here, including the dominant grass (Molinia arundinacea) and seven ...

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