Отправлено: 21.07.23 21:28. Заголовок: Naturalized species of the world

Since we had been talking about it these past days, I thought that we could have a topic only to talk about naturalized species that could leave descendants in the Neocene. I'll start by asking who could be the descendant of tall (megalocerus-sized) deer for the temperate forests of Southern South America, the red deer or the fallow deer? Both are introduced in Argentina and Chile.
Regarding competition with deermaras and local deers, its height will allow them to eat leaves from tall branches.

 Отправлено: 28.07.23 10:47. Заголовок: Interesting fish!..

Interesting fish!

 Отправлено: 28.07.23 13:54. Заголовок: лягушка пишет: And ..

лягушка пишет:

цитата:

And also add the fact that they stayed into fresh waters during planktonic disaster and survived due that.

Added it!
I also added some informations in the Southern sturgeon, including some changes in its size. I made it a bit larger (maximum of 100 cm), because its the predator of the emperor salmon. I explained their size with the bootleneck effect.

 Отправлено: 28.07.23 16:08. Заголовок: JOrnitho Ok, thank ..

JOrnitho
Ok, thank you!

 Отправлено: 29.07.23 15:45. Заголовок: I finished the descr..

I finished the description of the New Zealand salmon:
Flag-finned salmon (Oncorhynchus vexillipinna)
Order:Salmoniformes
Family:Salmonidae
Habitat:South Pacific and Antarctic Ocean, adults spawn in rivers of New Zealand.
During the entire Holocene, the introduction of exotic animals as new sources of food was common. The Chinook salmon was reproduced in fish farms of New Zealand, but some individuals escaped and started to reproduce in nature. While the decline of humanity had caused the exploitation of these populations, the salmon was able to survive in the Neocene. However, there was a consequence: there is bootleneck effect over these fishes. The flag-finned salmon is their descendant, an inhabitant of South Pacific and Antarctic Ocean, with adults spawnings in rivers of New Zealand.
The flag-finned salmon is small when compared to its ancestor, with an average size ranging from 65 to 85 cm. Such small size is one of the results of the bootleneck effect: the individuals that were ancestors to this species were small, with their size having allowed them escape the anthropocenic pressure. Then, they passed down the genes of size to their descendants. They are reddish-purple on the back and on the top of the head, with silvery sides and white ventral surfaces. When they move into fresh water the color changes to dark olive green and the belly color deepens. It has black stripes on its tail and the upper half of its body. Their most distinctive feature is their 30 cm long dorsal fin. Both the dorsal and caudal fins have yellow and silvery-blue color, which become brighter during the breeding season. Spawning males typically grow an elongated snout or kype, their lower fins become tipped with white and they have enlarged teeth.
Juvenile flag-finned salmon eat zooplankton and insects. They will also eat ctenophores. As adults, they eat smaller fish. On the other hand, the salmon is the prey for several other species, from sea birds to larger fishes and squids.
Most flag-finned salmon spawn during late summer and early winter in small streams and intertidal zones. Some travel more than 3,200 km upstream to find perfect spawning areas. The fry migrate out to sea from early spring through summer, almost immediately after becoming free swimmers. They spend three to seven years traveling very long distances in the ocean, reaching as far South as Antarctica. They die about two weeks after they return to the freshwater to spawn. They utilize the lower tributaries of the watershed, tend to build nests called redds, really little more than protected depressions in the gravel, in shallow edges of the watercourse and at the tail end of deep pools. The female lays eggs in the redd, the male sprays milt on the eggs, and the female covers the eggs with gravel. The female can lay up to 4000 eggs.

 Отправлено: 29.07.23 17:49. Заголовок: JOrnitho Good fish!..

JOrnitho
Good fish!

 Отправлено: 29.07.23 21:43. Заголовок: Interesting fish!..

Interesting fish!

 Отправлено: 30.07.23 02:31. Заголовок: Finished the descrip..

Finished the description of a descendant of an exotic fish:
Greater chinese tambaqui (Sinocolossoma major)
Order:Characiformes
Family:Serrasalmidae
Habitat: Poyang Lake, Yangtze and Yellow rivers and their tributaries.
During the entire Holocene, the introduction of animals by humans in habitats that weren’t their own was a common practice. The tambaqui (Colossoma macropomum) from South America was introduced in fish farms of China, but some individuals escaped and were able to survive in nature. In the Neocene, they give rise to the genus Sinocolossoma, with the greater chinese tambaqui being its type species. This species inhabits the Poyang Lake, Yangtze and Gan rivers and their tributaries.
The greater chinese tambaqui is a large fish, with 150 cm of length and 50 kg. It is similar in shape to their ancestor, being tall and laterally compressed with large eyes and a slightly arched back. The teeth of the greater chinese tambaqui are molar-like, an adaptation for crushing plant seeds and nuts. The lower half of its body is mainly blackish, while the remaining is olive. The pelvic, anal and small pectoral fins are white.
This species consumes fruits and seeds, especially from woody angiosperms and herbaceous species. Depending on the quantity and food quality of these foods, it causes the fish to decide on the location of their habitat. Zooplankton, insects, snails, shrimps, small fish, filamentous algae and decaying plants are consumed.
The greater chinese tambaqui is mostly solitary, but it migrates in large schools. During the non-breeding season, adults stay in flooded areas. They stay there for four to seven months during the flood season, but as the water level drops they move into the main river channels or to a lesser extent floodplain lakes. At the start of the next flood season, large schools move into rivers where they spawn. The spawning location is along woody shores or grassy levees. The schools then break up as the adults return to the flooded forest of white, clear and blackwater rivers, and the annual pattern is repeated. Juveniles stay near macrophytes year-round, only switching to the adult migration pattern when reaching sexual maturity. Maturity is reached at a length of about 60 cm. The species regularly reaches an age of 40 years.
The lesser chinese tambaqui (Sinocolossoma minor) is a closely related species. This species inhabits the Gan Jiang and Yuanshui rivers. They have 110 cm of length and 40 Kg. Their morphology is similar to that of their larger relative, with the exception of their belly that is white and fins that are black.

 Отправлено: 30.07.23 10:14. Заголовок: Interesting fish!..

Interesting fish!

 Отправлено: 30.07.23 17:55. Заголовок: JOrnitho Greater ch..

JOrnitho

цитата:

Greater chinese tambaqui

Good fish!
About coypu: yes, it can survive in Kenya and China, and also in Europe where it also were introduced. However, I described beaver-rat - coypu-like descendant of Thryonomys from Land of Zinj. How we can ecologically split them?

 Отправлено: 30.07.23 14:56. Заголовок: I found this article..

I found this article about the distribution of Myocastor coypu in areas where it was introduced. Where do you think that it can survive? Maybe Kenya and China?

 Отправлено: 30.07.23 18:57. Заголовок: лягушка пишет: Abou..

лягушка пишет:

цитата:

About coypu: yes, it can survive in Kenya and China, and also in Europe where it also were introduced. However, I described beaver-rat - coypu-like descendant of Thryonomys from Land of Zinj. How we can ecologically split them?

For China, I thought that it could have evolved as an analogue to the extinct Castoroides. It would be very large and eating aquatic plants in lakes and rivers, such as the Yangtze.
The African one could have evolved to be small, perhaps like an Oryzomys palustris.
For China, I thought that this rat could have evolved

 Отправлено: 31.07.23 08:52. Заголовок: JOrnitho Good ideas..

JOrnitho
Good ideas!

 Отправлено: 31.07.23 21:58. Заголовок: лягушка Some species..

лягушка
Some species of fish that could evolve in South America:
-Pangasius hypophthalmus in rivers of the Amazon rainforest
-Parachromis managuensis in São Francisco and Parnaíba rivers
-Oreochromis in coastal waters. Schools of this genus are found in estuaries and saltwater in Brazilian coast.