There are a wide range of reproductive strategies employed by different species. Some animals, such as the human and Northern Gannet, do not reach sexual maturity for many years after birth and even then produce few offspring. Others reproduce quickly; but, under normal circumstances, most offspring do not survive to adulthood. For example, a rabbit (mature after 8 months) can produce 10–30 offspring per year, and a fruit fly (mature after 10–14 days) can produce up to 900 offspring per year. These two main strategies are known as K-selection (few offspring) and r-selection (many offspring). Which strategy is favoured by evolution depends on a variety of circumstances. Animals with few offspring can devote more resources to the nurturing and protection of each individual offspring, thus reducing the need for many offspring. On the other hand, animals with many offspring may devote fewer resources to each individual offspring; for these types of animals it is common for many offspring to die soon after birth, but enough individuals typically survive to maintain the population. Some organisms such as honey bees and fruit flies retain sperm in a process called sperm storage thereby increasing the duration of their fertilityReproductive strategies
There are a wide range of reproductive strategies employed by different species. Some animals, such as the human and Northern Gannet, do not reach sexual maturity for many years after birth and even then produce few offspring. Others reproduce quickly; but, under normal circumstances, most offspring do not survive to adulthood. For example, a rabbit (mature after 8 months) can produce 10–30 offspring per year, and a fruit fly (mature after 10–14 days) can produce up to 900 offspring per year. These two main strategies are known as K-selection (few offspring) and r-selection (many offspring). Which strategy is favoured by evolution depends on a variety of circumstances. Animals with few offspring can devote more resources to the nurturing and protection of each individual offspring, thus reducing the need for many offspring. On the other hand, animals with many offspring may devote fewer resources to each individual offspring; for these types of animals it is common for many offspring to die soon after birth, but enough individuals typically survive to maintain the population. Some organisms such as honey bees and fruit flies retain sperm in a process called sperm storage thereby increasing the duration of their fertility
Subscribe to:
Post Comments (Atom)
I was diagnosed with COPD four years ago. For over two years, I relied on inhalers and several other medications, but unfortunately, the symptoms kept getting worse. My breathing became more labored, I experienced frequent coughing fits, and my energy levels started to decline quickly. Last year, out of desperation and hope, I decided to try a herbal treatment program from NaturePath Herbal Clinic. Honestly, I was skeptical at first, but within a few months of starting the treatment, I began to notice real changes. My breathing became easier, the coughing subsided, and, incredibly, my energy returned. It’s been a life-changing experience. I feel more like myself again better than I’ve felt in years. If you or a loved one is struggling with COPD, I truly recommend looking into their natural approach. You can visit their website at [www.naturepathherbalclinic.com] [info@naturepathherbalclinic.com]
ReplyDelete