CAJ | 학술논문

研究了不同饥饿时间下大型溞Daphnia magna (体长约3 mm)对沙角衣藻Chlamydomonas sajao和蛋白核小球藻Chlorella pyrenoidos的摄食选择性。沙角衣藻与蛋白核小球藻相比,具有较高的适口性,但营养价值相对较低。按照沙角衣藻和蛋白核小球藻的比例分别为5×104.35×104、20×104.20×104、35×104.5×104 cells/mL混合投喂饥饿0、0·25、1、4、8 d的大型溞,3 h后测定大型溞的摄食率、滤水率和食物选择系数。结果表明：与饱食组和短时间饥饿(0·25、1 d)组相比,长时间饥饿(4、8 d)导致大型溞对蛋白核小球藻的摄食率和滤水率显著增加(P<0·05),而对沙角衣藻的摄食率和滤水率显著降低(P<0·05)；饱食和短时间饥饿状态下大型溞优先摄食沙角衣藻,而在长时间饥饿状态下大型溞优先摄食蛋白核小球藻；大型溞在长时间饥饿和短时间饥饿状态(含饱食)下的最优觅食行为不受食物中沙角衣藻与蛋白核小球藻相对密度的影响。研究表明,大型溞的饥饿状态可以影响其对藻类食物的选择性。
연구료불동기아시간하대형소Daphnia magna (체장약3 mm)대사각의조Chlamydomonas sajao화단백핵소구조Chlorella pyrenoidos적섭식선택성。사각의조여단백핵소구조상비,구유교고적괄구성,단영양개치상대교저。안조사각의조화단백핵소구조적비례분별위5×104.35×104、20×104.20×104、35×104.5×104 cells/mL혼합투위기아0、0·25、1、4、8 d적대형소,3 h후측정대형소적섭식솔、려수솔화식물선택계수。결과표명：여포식조화단시간기아(0·25、1 d)조상비,장시간기아(4、8 d)도치대형소대단백핵소구조적섭식솔화려수솔현저증가(P<0·05),이대사각의조적섭식솔화려수솔현저강저(P<0·05)；포식화단시간기아상태하대형소우선섭식사각의조,이재장시간기아상태하대형소우선섭식단백핵소구조；대형소재장시간기아화단시간기아상태(함포식)하적최우멱식행위불수식물중사각의조여단백핵소구조상대밀도적영향。연구표명,대형소적기아상태가이영향기대조류식물적선택성。
In the present work we evaluated the influence of fasting time on foraging behavior of water fleas Daphnia magna. The water fleas were fasted for 0, 0. 25, 1, 4, or 8 d, and then were allowed to graze on a mixture of al-gae Chlamydomonas sajao ( Cs) and Chlorella pyrenoidosa ( Cp) with a proportion of 5í104 cells/mL ( Cs):35í104 cells/mL (Cp), 20í104 cells/mL(Cs):20í104 cells/mL(Cp)and 35í104 cells/mL(Cs):5í104 cells/mL ( Cp) for three hours. Then the ingestion rate, filtration rate and food selectivity coefficient of water fleas on the two algae were analyzed and evaluated. The results showed that significantly high ingestion rate and filtration rate on Chlorella pyrenoidosa and significantly low ingestion rate and filtration rate on Chlamydomonas sajao were found in the water fleas fasted for long period ( 4 , and 8 d ) . In satiation or short fasting period ( 0 . 25 , and 1 d ) ( P<0. 05), however, the water fleas was found to prefer to Cs, and prefer Cp in long fasting period (4, and 8 d)(P<0. 05). Moreover, the foraging behaviors were not influenced by the relative food abundance of each green alga and the mechanisms of feeding selectivity were discussed based on the optimal foraging theory. The findings indicate that starvation affects the selectivity of wate fleas for algal food.