This maybe the first record of the genus in HK... 作者:
hongkongensis 時間: 2010-9-26 22:07
QUOTE:
原帖由 jasonpoon 於 2010-9-26 21:43 發表
This maybe the first record of the genus in HK...
This is the first record of this genus in South China!作者:
jasonpoon 時間: 2010-9-29 09:20 標題: 回覆 #30 hongkongensis 的帖子
But consider Taiwan as part of S.China.作者:
hongkongensis 時間: 2010-9-29 12:51 標題: 回覆 #31 jasonpoon 的帖子
You are right, I should change my sentence to: This is the first record of the genus in Mainland China.作者:
jasonpoon 時間: 2010-9-29 14:17 標題: 回覆 #32 hongkongensis 的帖子
I have the same feeling as you have, that the global warming will drive some re-distribution of fishes. This genus is characterized by an interesting distribution pattern. Many species are restricted to 1 or 2 rivers only, notably in Australia. The evolution may involve maritime dispersal with rapid speciation within freshwater.
H. cyprinoides has been widely recorded from Asia to Africa, this species occurs in more tropical brackish habitas in Asia - Ryukyu, Palau, Taiwan. And now it may well be newly extended to the subtropical S. China coast.
Well, we have found quite a lot of amphidromous fishes and shrimps with a "tropical" origin in recent years. Indeed, these species are not new to subtropical Asia as most of them can also be found in Taiwan and even southern Japan.
These new discoveries in South China can be due to many reasons. The first that can easily be thought of is that researchers in the past were not doing their works thorough enough. But I am not blaming them as research technique and information on fish taxonomy are much better now.
The second possible reason would be the climate issue. As everyone knows Hong Kong (and China) is becoming hotter and hotter, it is also possible that it would become a more suitable place for tropical species than before. However, this would be more complicated than we think. For instance, maybe the ocean current is affected by some means (such as increased temperature) and brings these creatures to China coast. Who knows?
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