Two commonly used methods are passive trapping with bee bowls or active netting of bees on flowers, but each of these has drawbacks. Comparing the outcomes of the two methods is complicated by their uncomparable units of effort. The abundance distribution of bee species is also ty...
47 Resource-mediated competition between two plant species with different rates of 50:16 Primes, postdocs and pretentiousness 1:11:04 Agent-based modelling and topological data analysis of zebrafish patterns 57:22 Fubini foiled_ pathological foliations from symbolic codings 1:00:50 Gaps in the ...
These species include T. reflexum L. (b... NL Taylor,JM Gillett,JJN Campbell,... - 《Crop Science》 被引量: 16发表: 1994年 Breeding strategies for developing transgenic white clover cultivars The introduction of foreign genes into elite white clover (Trifolium repens L.) genotypes has ...
But experts say we should be taking care of all our bees.Researchers say conservation efforts should be aimed at a wide number of species—even those that currently contribute little to crop pollination—in order to maintain biodiversity and ensure future food security. (4) ...
He added that scientists must understand, "What species(物种)are winning and losing in the fight for survival(生存斗争). He said this knowledge would help us to protect(保护)the "helpful" insects. (1) According to the report of "Science", insects population has fallen by about since 198...
The approach is illustrated by application to the problem of finding the number of species in a data set of Australasian tetragonula bees. Requirements here include two new statistics formalising the largest within-cluster gap and cluster separation. Due to the typical nature of expert knowledge, ...
Many of the places where insects live are disappearing because of new cities and land being used for farming. Another reason is global warming. Scientists say that in the UK, the number of butterflies, bees and wasps(黄蜂) has fallen by up to 60 percent. Many countries are worried about ...
Number of queens in a hive is View Solution (A): Honey bees are colonial , social and polymorphic insects. (R) : A colony of honeybee consists of four castes, viz. , drones , queens, workers and soldiers. View Solution The most common species of honeybee reared commercially in artific...
£120bn ($150bn) and contribute around £690m ($850m) to the UK economy every year.So, bees are worth protecting, and although a small number of bee species are vital for crops such as oilseed rape, apples and strawberries, experts say we should be taking care of all our bees. ...
This is in line with the field studies of the project which indicated a positive effect of biodiversity measures on abundance of bees in general and, particularly, bumblebee species, already two years after implementation (Kulow et al. unpublished). Further, the simulations suggest that also ...