摘要:

Aspects of the diel feeding ecology of the odonate nymphsAnax JuniusandIschnura verticalisand the ephemeropteranCallibaetis fluctuanswere examined over a 24-h period in a small pond. Detrital material was the primary food of bothA. JuniusandI. verticalis.Aquatic insects (mainlyC. fluctuans) were the second ranking prey in the diel diet ofA. Junius, whereas ostracods were the second most important prey consumed byI. verticalis.Diet overlap betweenA. JuniusandI. verticaliswas high ([xbar] = 0.76) when detritus was considered but fell to 0.25 when detrital material was omitted. Food consumption by the odonate nymphs was highest at 0800 h and was generally lowest from 2400 h to 0400 h. Conversely, feeding activity byC. fluctuanspeaked between 2400 h and 0400 h with the least feeding occurring at 0800 h. Differences in diel feeding patterns between the ephemeropteran and odonate species may reflect predator avoidance behavior byC. fluctuans.

ISSN:0270-5060    

DOI:10.1080/02705060.1995.9663433

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

To increase the accuracy of surveys of epilithic invertebrates like zebra mussels, we recommend a new technique for estimating density in cobble and other coarse substrate areas. The density of benthic macroinvertebrates per unit of bottom area (BMI/BA) is estimated by multiplying individual observations of the number of organisms per unit of rock surface area (BMI/RSA) by the rock surface area per unit of rock-covered bottom area (RSA/RBA=3.4 in our study area) and the proportion of rock cover in the area (RBA/BA= 0 to 1.0).

ISSN:0270-5060    

DOI:10.1080/02705060.1995.9663434

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

We examined leaf decomposition in blackwater wetlands for foliage from longleaf pine (Pinus palustris), sweetgum (Liquidambar styraciflua), and flowering dogwood (Cornus florida). Of these, the leaves of longleaf pine were the slowest to decompose during a five-month period. However, we conclude that the decomposition of leaf litter is not appreciably affected by the acidity associated with blackwater wetlands.

ISSN:0270-5060    

DOI:10.1080/02705060.1995.9663435

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

ISSN:0270-5060    

DOI:10.1080/02705060.1995.9663436

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

ISSN:0270-5060    

DOI:10.1080/02705060.1995.9663437

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

ISSN:0270-5060    

DOI:10.1080/02705060.1995.9663422

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor