Dioecy is reported to be correlated with a number of ecological traits, including tropical distribution, woody growth form, plain flowers, and fleshy fruits. Previous analyses have concentrated on determining whether dioecy is more likely to evolve in lineages possessing these traits, rather than considering the speciation and extinction rates of dioecious lineages with certain combinations of ...

Abstract: Marine macro-algae are very important biological indicators of the ecological status of the marine environment because they are first to react to the pollution entering the sea including nutrients which determine the trophy of the ambient of the environment. The aim of this paper is to evaluate the present trophic level and the health status of the sampling stations according to the E...

Background & Aim: In the present research, we investigated phytochemical characteristics of two important species of Verbascum genus. Enormous reconnaissance and field surveys were conducted to identify the most important natural habitats of Verbascum species in Kohgiluyeh va Buyerahmad province, southern Iran. Experimental: The aerial parts of Verbascum songaricum a...

Background & Aim: In the present research, we investigated phytochemical characteristics of two important species of Verbascum genus. Enormous reconnaissance and field surveys were conducted to identify the most important natural habitats of Verbascum species in Kohgiluyeh va Buyerahmad province, southern Iran. Experimental: The aerial parts of Verbascum songaricum a...

the order hymenoptera with more than 115000 described species, includes over 10% of species diversity in the world. these insects are one of the most important groups in economic and ecological terms. vespidae family plays an important role in biological control of some insect pests. this family includes six subfamilies and almost 4150 known species in the world( carpenter,1982 ). these insects...

I review the distribution of ant genera in cold biomes of the northern hemisphere, and discuss opportunities and challenges in using ants as environmental, ecological, and biodiversity indicators in these biomes. I present five propositions that, if supported with future research, would allow ants to be used as biological indicators in north-temperate cold biomes: (1) Distribution of individual...

An animal’s social life presents him with a constant yet varying series of challenges that they must solve daily if they want to survive and reproduce. An evolutionary approach to the evolution of social behavior and cognition predicts the convergent emergence of similar patterns and abilities in animal species facing similar challenges, as well as the emergence of a large diversity of behavior...

Groups of organisms that have diversified to produce species adapted to a variety of ecological niches have attracted increasing attention in recent years. A widely held view is that such adaptive radiation is triggered by the availability of under-exploited resources or the absence of predators, as may occur after colonization of an island or a mass extinction. Such ecological opportunity allo...