Sentences with phrase «population fluctuates from year to year»

Not exact matches

He told me that grey squirrel numbers fluctuate considerably from year to year and that at the moment we are suffering from a population explosion as the result of a combination of relatively abundant broad - leaved seed crops and mild winters in recent years.

Their population has grown from about 50,000 to over 300,000 in the last 40 years, and is expected to ultimately fluctuate around a still - unknown carrying capacity, the researchers said.

Furthermore, to determine with confidence the effects of any spay / neuter program on the animal population, which naturally fluctuates somewhat from year to year, population trends must be examined over a period sufficiently long to absorb those natural fluctuations.

A significant contributor to speech and language impairment in this population is the high rate of hearing loss (Laws 2014), particularly fluctuating conductive hearing loss from frequent middle ear infections, which has been observed to affect 93 % of one - year olds, with 68 % still affected at five years (Barr 2011).