What does reproductive strategy mean?

What does reproductive strategy mean?

Reproductive strategies are structural, functional and behavioural adaptations that improve the chances offertilization and/or increase the survival rate of. Asexual Reproduction Requires only one parent Offspring have 100% the same chromosomes as the parent.

What is the best reproductive strategy?

The optimal reproductive strategy of a hypothetical male primate is characterized by rapid sexual maturation, followed by life-long exclusive access to an unlimited number of fertile females willing to mate, and offspring survival should be independent of paternal care.

What are the reproductive strategies in fish?

The methods of reproduction in fishes are varied, but most fishes lay a large number of small eggs, fertilized and scattered outside of the body. The eggs of pelagic fishes usually remain suspended in the open water. Many shore and freshwater fishes lay eggs on the bottom or among plants. Some have adhesive eggs.

Which fish does not lay eggs?

Among aquarium fish, livebearers are nearly all members of the family Poeciliidae and include guppies, mollies, platies and swordtails. The advantages of livebearing to the aquarist are that the newborn juvenile fish are larger than newly-hatched fry, have a lower chance of mortality and are easier to care for.

What makes chondrichthyes unique?

Species in this class have paired fins, hard scales, a two-chambered heart, and a pair of nostrils. Most species have 5-7 gill slits on each side of their body. Some species produce egg cases, others give birth to live young. Sharks swim by moving their heads and tails from side to side in the water.

What do all chondrichthyes have in common?

Although both groups have many characteristics in common (such as the possession of a cartilaginous skeleton, placoid scales, teeth simply embedded in gums, a spiral valve in the intestine, urea retention habitus, internal fertilization [for which the males have claspers], and the absence of a swim bladder), the two …

Are chondrichthyes Amniotes?

Includes Myxini, Cephalaspidomorpha, Chondrichthyes, Osteichthyes, Amphibia. Amniotes – vertebrates that possess an amnion. Includes Reptilia, Aves, Mammalia.

What organisms are in class chondrichthyes What characteristics do they have in common?

What characteristics do organisms in the class Chondrichthyes have in common? Jawed fish, lack swim bladder, have cartilaginous skeletons, energy efficient, store low-density oils for buoyancy, angled fins/wings for lift, and multiple rows of teeth.

What is the largest animal in the class chondrichthyes?

The Largest Fish is a Shark! The world record for the largest fish is a whale shark measuring 40 feet (12.2 m).

Why are sharks cartilaginous fish?

Cartilaginous skeleton Sharks, rays, skates, and chimaeras (also know as rat fishes) all have cartilaginous skeletons. Cartilage is less dense than bone, allowing sharks to move quickly through the water without using too much energy.

What characteristics do all members of Class Reptilia share?

Traits of Reptiles and Amphibians

• Reptiles are vertebrates. They have backbones.
• Their bodies are completely covered with scales.
• They are cold-blooded.
• Reptiles produce shelled eggs or bear live young.
• All species fertilize eggs internally.
• All species of reptiles have at least one lung.

What are the 4 types of reptiles?

The four main reptile groups are the Turtles and Tortoises, Snakes and Lizards, Crocodiles and Alligators, and Tuatara (a single species more primitive than other reptile groups and found only in a group of small islands near New Zealand).

What are the 5 types of reptiles?

The major groups of living reptiles—the turtles (order Testudines), tuatara (order Rhynchocephalia [Sphenodontida]), lizards and snakes (order Squamata), and crocodiles (order Crocodylia, or Crocodilia)—account for over 8,700 species.

What is the basis for classification of Class Reptilia?

Classification of Reptiles In traditional taxonomy, reptiles were classified based on their physical features (morphology); they are ectothermic, their skin is covered in scales, and they are amniotes. Reptiles include all the amniotes except birds and mammals.

What are reptiles categorized together?

Classification of reptiles Thus reptiles were defined as the set of animals that includes crocodiles, alligators, tuatara, lizards, snakes, amphisbaenians and turtles, grouped together as the class Reptilia (Latin repere, “to creep”).

Why is a crocodile a reptile?

Reptiles are turtles, snakes, lizards, alligators and crocodiles. Unlike amphibians, reptiles breathe only through their lungs and have dry, scaly skin that prevents them from drying out.

Is Reptile a phylum?

Chordate

Why would you call turtle a reptile but not an amphibian?

On the contrary, a reptile cannot lay eggs into the water, though may roam into the water; and secondly they do not have ability to respire into the water. These facts suggest that reptiles are the land animals and are not amphibians.

What are 10 reptiles?

Here are the top 10 reptiles that interested users of the English-language version of Wikipedia in 2014:

• Komodo dragon.
• Black mamba.
• Saltwater crocodile.
• King cobra.
• Gila monster.
• Cottonmouth (viper)
• American alligator.
• Leatherback sea turtle.

What does a reptile eat?

With few exceptions, modern reptiles feed on some form of animal life (such as insects, mollusks, birds, frogs, mammals, fishes, or even other reptiles). Land tortoises are vegetarians, eating leaves, grass, and even cactus in some cases.

How often do reptiles need to eat?

That all depends on your snake’s age, size, and activity level. Smaller or younger snakes usually eat twice each week, while larger, more mature snakes typically eat once every week or two. Female snakes approaching breeding season can be fed more frequently.

Do reptiles need to eat every day?

Most young lizards and herbivorous reptiles will need to eat every day, whereas young snakes may eat twice a week. Sick reptiles, or those preparing for breeding, may need to eat more or more often than healthy adult reptiles not in breeding season.

What animal eats lizards?

Lizards are preyed upon by a number of creatures, such as hawks, snakes, dogs, wolves and other lizards. Although there are hundreds of different type of lizard species, they are commonly on the lower end of the food chain. Lizards are snacks for a wide variety of predators, including some spiders.

What would kill a lizard?

Coffee Powder This is a very effective method to kill lizards. Make your own lizard death-balls by combining coffee powder and tobacco powder and rolling them into small balls. Stick them on toothpicks or matchsticks and leave them around the house – especially behind shelves and cupboards where they hide.