CHEN Pei, CHEN Guo-zhu, LIN Xiao-tao, XU Zhong-neng
1. Institute of Hydrobiology, Jinan University, Guangzhou 510632, China; 2. Key laboratory for water eutrophication and red-tide control, Department of Education of Guangdong Province, Guangzhou 510632, China
Mosquito fish,an invasive species,was introduced into mainland China in 1927 and entered Guangzhou during 1960s.The diel feeding rhythm of mosquito fish taken from Ming Lake,an artificial lake in Jinan University in summer,2007 was investigated in this study.Population structure of mosquito fish in summer was very complex,consisting of female,male and larvae fish groups.These feeding groups had different feeding rhythm in this season.Female feeding rhythm showed two peaks at 10:00 and 22:00.The second peak was the highest,and the food in the fish gut was 11.70±11.60 mg and feeding index was 190.22±155.61 at that time.Larvae fish feeding rhythm had two peaks at 6:00 and 18:00,and the highest one peaked at 6:00,when the food in the gut was 1.08±1.09 mg and feeding index was 128.44±105.49.Male fish feeding rhythm had a single peak at 14:00,at which the food in the gut was 0.71±0.96 mg and feeding index was 71.80±107.65.Different feeding rhythms among these three feeding groups could reduce the intra-specific competition.
[2] Caiola N and Sostoa de A.2005.Possible reason for the decline of two native tooth carps in the Iberian Peninsula:evidence of competition with the introduced Eastern mosquito fish[J]. Journal Apply Ichthyology,21:358-363.
[3] Becker A,Laurenson L J B,Jones P L,et al.2005.Competitive interactions between the Australian native fish Galaxias maculatus and the exotic mosquitofish Gambusia holbrooki,in a series of laboratory experiments[J]. Hydrobiologia,549:187-196.
[4] Smith G R,Boyd A,Dayer C B.2007.Behavioral responses of American toad and bullfrog tadpoles to the presence of cues from the invasive fish,Gambusia affinis[J]. Biologcial invasion,58:386-394.
[5] Hurlbert S H,Zcdler J,Fairbanks D.1972.Ecosystem alteration by mosquitofish (Gambusia affinis) predation[J]. Science,New Series,175(4022):639-641.
[6] Sokolov N P and Chvallva M A.1936.Nutrition of Gambusia affinis on the rice fields of Turkestan[J]. The Journal of Animal Ecology,5(2):390-395.
[7] Cabral J A,Mieiro C L,Marques J C.1998.Environmental and biological factors influence the relationship between a predator fish,Gambusia holbrooki,and its main prey in rice fields of the Lower Mondegn River Valley (Portugal)[J]. Hydrobiologia,382:41-51.
[8] GARCíA-Berthou E.1999.Food of introduced mosquitofish:ontogenetic diet shift and prey selection[J]. Journal ofFish Biology,55:135-147.
[9] Specziár A.2004.Life history pattern and feeding ecology of the introduced eastern mosquitofish,Gambusia holbrooki,in a thermal spa under temperate climate,of Lake Hévíz,Hungary[J]. Hydrobiologia,522:249-260.
[16] Helfman G S.1986.Fish behaviour by day,night and twilight.In:The behaviour of Teleost fishes.Tong J P,Baltimore M L[J]. Baltimore,Maryland:The Johns Hopkins University Press,366-387.
[18] Blanco S,Romo S,Villena M J.2004.Experimental study on the diet of mosquitofish (Gambusia holbrooki) under different ecological conditions in a shallow lake[J]. International Review of Hydrobiology,89:250-262.
[19] Wooten M C,Seribner K T,Smith M.H.1988.Genetic variability and systematies of Gambusia in the southeastern United States[J]. Copeia,283-289.
[20] Smith C C.2007.Independent effects of male and female density on sexual harassment,female fitness,and male competition for mates in the western mosquito fish Gambusia affinis[J]. Behavioral Ecology and Sociobiology,61:1349-1358.
[21] Smith C C,Sargent R C.2006.Female fitness declines with increasing female density but not male harassment in the western mosquitofish,Gambusia affinis[J]. Animal Behaviour,71:401-407.
[22] Dadda M,Pilastro A,Bisazza A.2005.Male sexual harassment and female schooling behaviour in the eastern mosquitofish[J]. Animal behaviour,70:463-471.
[23] Dionne M.Cannibalism.1985.Food availability,and reproduction in the mosquitofish Gambusia affinis:a laboratory experiment[J]. The American Naturalist,126(1):16-23.
[24] Meffe G K,Crump M L.1987.Possible growth and reproductive benefits of cannibalism in the mosquitofish[J]. The American Naturalist,129(3):203-211.
[25] Nesbit D H.1993.Cannibalism frequencies in wild population of the eastern mosquitofish (Gambusia Holbrooki:Poeciliidae) in South Carolina[J]. Copeia,3:867-870.
[26] Benoit H P,Post J R,Barbet A D.2000.Recruitment Dynamics and Size Structure in Experimental Populations of the Mosquitofish,Gambusia affinis[J]. Copeia,(1):216-221.
