S. The survivorship curves given below detail the survivorship of female (a) Afr

Question

S. The survivorship curves given below detail the survivorship of female (a) African and (bi Asian clephants in zoos and in the wild. Data are provided for soo captive- born, zoo wild brb moved to zoos, and wild-born with natural mortality. Based on what you have learned in chapter and the previous chapters, discuss what is happening 2oo . Zoo wild-bom 10 50 70 Wid-bom, Zoo Zoo 30 50 70 Connect Ecology helps you stay a step ahead in your st videos that bring concepts to life and practice tests to a key ecological concepts. Your instructor may also recom Visit www.mhhe.com/stilingecologyto connecte) ECOLOGY CHAPTER9 Lf

Explanation / Answer

For this firstly we should know about survivorship curve.

Definition:- A survivorship curve is the graphic representation of the number of individuals in a population that can be expected to survive to any specific age.

Now moving on to our question we have 3 kind of species in data given above that are :-

a) Female African Elephant in zoo and in wildlife

b) Asian Elephants in Zoo and in wildlife .

Therefore it means that we are comparing life's of these two types of female elephants at particular age.

To predict if a population will grow or shrink,we need to know birth and death rates for organisms at different ages as well as the current age.

Explaining the graphical representation:-

A) AFRICANS

1) Zoo Captive Born:- In the graph above, the zoo captive born elephants are represented by a sharp red line. While observing the graph it interprits that at the age of 10 years the animals showed highest survivorship rate and at the age of 18 years there is a sharp decline which is then constant till the age of 30 yrs.

2) Zoo Wild Born:- In the graph above the zoo wild born elephants are represented by dotted red line.While observing the graph it interprits that there is a constant decline after the age of 10 years and it terminated at the age of 50. This indicates that the higher survivorship rate is seen only at 10 yrs of age.This means that at the age of 10 years the highest population of zoo wild born elephants can be seen.

3) Wild Born And Natural mortality:- In the graph above wild born and natural mortality elephants are represented by sharp black line. while observing the graph it interprits that there is a wavy decline that is nowhere constant.On comparing this one with the other two we find that these elephants showed best survivalship. The waviness of the curve can be due to various environmental factors. The best survivalship is in the age span of 50 to 70 years as compared to other two. The survivalship terminates at the age of 70 years.

B) ASIANS

1)Zoo Captive Born:-In the graph above zoo captive born animals are represented by sharp red line.while observing the graph it interprits that there is a sharp decline at every 2 years constantly till 15 years of age and then it sharply declines and then become constant till age around 28 years, similarly there is a lot fluctuations visible at certain intervals till age of 30 to 33 years and then again become constant till age of around 45 to 48 and the sharply declines and terminates.

2) Zoo wild born:- this graph depicts the survival rate of the zoo wild born elephants in Asian race. This is represented by a dotted line which is showing a constant decline and terminates at the age of 70. A unique feature of this slope is that this species does not show any sharp decline as compared to the previous one.

3) wild born natural mortality:- this is represented by a sharp black line. This graph interprets a unique feature which is not shown in the other graphs. There is a small rise after the age of 10 years which will last for a short time span and then there there is wavy decline which will terminate after the age of 70 years. This kind of species will show the best survival rate ever.

CCOMPARISON

According to me, in the graph A and B , thewild born and natual mortaliy elephants has shoen the bet survivorship and that too i typical wild conditions thus, provin the survivalof the "fittest".

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.