Populations of these organisms increase exponentially via asexual reproductive strategies to take full advantage of the rich supply resources. The Placental Mammal and Reproduction Most mammals – excepting Monotremes and Marsupials – are placental mammals. In this class of vertebrates, we find protection of the developing young and subsequent care of the offspring exceedingly highly developed. Terrestrial vertebrates clasp each other tightly during copulation, the act by which the male deposits his sperm into the female’s reproductive tract. In all other vertebrates, the developing embryo is separated from its mother’s body by the amniotic membrane which surrounds the egg. The reproductive behaviour of fishes is remarkably diversified: they may be oviparous (lay eggs), ovoviparous (retain the eggs in the body until they hatch), or viviparous (have a direct tissue connection with the developing embryos and give birth to live young). In vertebrates, reproductive strategies are regulated by the brain-gonadal axis, which controls the synthesis of reproductive hormones triggering all aspects related to reproduction. Animal Reproductive Strategies The ultimate goal of each species is to produce the maximum number of surviving offspring using the ... Internal fertilisation occurs in insects and terrestrial vertebrates. Reproductive modes and strategies have been selected in species history: more anciently and with more conservative characters the former; more recently and with some flexibility in … ... Vertebrates: Origin, Characteristics & Diversity 6:02 Vertebrate Physiology Bio410. This web page contains notes to accompany lectures in Vertebrate Physiology, Biology 410, taught by Dr. Peter King in the Department of Biology, Francis Marion University, Florence, South Carolina, 29502, USA.. Reproduction A species is considered semelparous if it is characterized by a single reproductive episode before death, and iteroparous if it is characterized by multiple reproductive cycles over the course of its lifetime. The table below summarizes some of the differences between r … Typical K-selected organisms are elephants, and humans. Yaks, rabbits, cows, hippopotamuses, bats and humans all fall within this category. Together with the development of the cerebral hemispheres and complex behaviour, the mammals owe their success to the efficiency of their reproductive system. Reproductive behaviour in vertebrates Fishes. Reproductive strategies regulate reproductive effort. The male gametes are released directly into the body of the female. Each group's reproductive strategy is similar, yet there are slight differences, so let's take a look at each. For the giant Galápagos tortoises pictured here, mating may take hours and is initiated by the male, who bangs his shell against that of the female to get her attention. Their reproductive strategy is to grow slowly, live close to the carrying capacity of their habitat and produce a few progeny each with a high probability of survival. Semelparity and iteroparity are two contrasting reproductive strategies available to living organisms. The reason for this is that […] Abstract Vertebrate reproductive modes, which are characterized by egg and development type, have been compared and, in some cases, re-defined.