摘要:

The capture ofDiaptomus siciloidesandDiaptomus pallidusby gizzard shad (Dorosoma cepedianum) was simulated using a suction device. Based on simulations, the capture probability forD.siciloideswas significantly greater (p < 0.025) than that forD.pallidus. Capture probabilities in the simulations varied from 0.092–0.391 forD.siciloidesand from 0.047–0.210 forD.pallidus. These capture probabilities usually underestimated the capture frequencies observed in feeding experiments employing live shad. The shad did not exhibit a tendency to selectD.siciloidesoverD.pallidusbut appeared to capture the calanoids in proportion to their densities in the test pools.

ISSN:0270-5060    

DOI:10.1080/02705060.1987.9664659

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Absolute volume estimates of total material ingested by ephemeropteran nymphs of various sizes (34 sites including 20 species) were made using an electronic counter. Based on 12 months data, detritus accounted for 90% of the stomach contents by volume, and the remaining 10% of the food material consisted almost entirely of diatoms. The relationship between absolute total volume of stomach contents and total length of nymphs fitted an exponential function. Nymphs of the smallest (2–4 mm) and largest (14–16 mm, 16–18 mm) size classes tended to have a smaller volume of ingested material than would be predicted by the regression.

ISSN:0270-5060    

DOI:10.1080/02705060.1987.9664660

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0270-5060    

DOI:10.1080/02705060.1987.9664661

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0270-5060    

DOI:10.1080/02705060.1987.9664662

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0270-5060    

DOI:10.1080/02705060.1987.9664648

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor