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The stoplight parrotfish (Sparisoma viride) is a species of marine ray-finned fish, a parrotfish from the family Scaridae, inhabiting coral reefs in Florida, Caribbean Sea, Gulf of Mexico, Bermuda and as far south as Brazil. [3] It mainly feeds on algae by scraping and excavating it with its teeth. Like most of its relatives, it is able to ...
California sheephead can reach a size of 91 cm (3 ft) and a weight of 16 kg (35 lb). [5] All sheepheads are born as females and eventually change to males at roughly 45 cm (1.5 ft). [5] The age of the transition depends on environmental factors such as food supply. [5] The species can live for over 50 years. [5]
Examples of intraspecific sexual mimicry in animals include the spotted hyena, certain types of fish, passerine birds and some species of insect. Interspecific sexual mimicry can also occur in some plant species, especially orchids. In plants employing sexual mimicry, flowers mimic mating signals of their pollinator insects.
Fish with low inbreeding showed almost twice the aggressive pursuit in defending territory than fish with medium inbreeding, and furthermore had a higher specific growth rate. A significant effect of inbreeding depression on juvenile survival was also found, but only in high-density competitive environments, suggesting that intra-specific ...
A few nouns are said to be of "ambiguous" gender, meaning that they are sometimes treated as masculine and sometimes as feminine. [4] Additionally, the terms "common gender" and "epicene gender" are used to classify ways in which grammatical gender interacts (or not) with "natural gender" (the gender identity of a person, or the sex of an animal).
Yearlings of A. gueldenstaedtii (a) and P. spathula (d), and their hybrids: (b) typical LH (larger genome) hybrid, (c) typical SH (smaller genome) hybrid. [1]The sturddlefish is a hybrid of the American paddlefish (Polyodon spathula) and the Russian sturgeon (Acipenser gueldenstaedtii), accidentally created by researchers in 2019 and announced in 2020. [2]
W. D. Hamilton gave the following simple explanation in his 1967 paper on "Extraordinary sex ratios", [3] given the condition that males and females cost equal amounts to produce: Suppose male births are less common than female. A newborn male then has better mating prospects than a newborn female, and therefore can expect to have more offspring.
Gonochorism has evolved independently multiple times. [8] It is very evolutionarily stable in animals. [9] Its stability and advantages have received little attention. [10]: 46 Gonochorism owes its origin to the evolution of anisogamy, [11] but it is unclear if the evolution of anisogamy first led to hermaphroditism or gonochorism.