Size matters more than method: Visual quadrats vs photography in measuring human impact on Mediterranean rocky reef communities

被引：51

作者：

Parravicini, Valeriano ^{[1
]}

Morri, Carla ^{[1
]}

Ciribilli, Giada ^{[1
]}

Montefalcone, Monica ^{[1
]}

Albertelli, Giancarlo ^{[1
]}

Bianchi, Carlo Nike ^{[1
]}

机构：

[1] Univ Genoa, Dipartimento Studio Terr & Sue Risorse, DipTeRis, I-16132 Genoa, Italy

来源：

ESTUARINE COASTAL AND SHELF SCIENCE | 2009年 / 81卷 / 03期

关键词：

visual sampling; photography; small-scale variability; date mussel harvesting; rocky reefs; Mediterranean Sea; LITHOPHAGA-LITHOPHAGA; HUMAN DISTURBANCE; SAMPLE-SIZE; VARIABILITY; SEA; ASSEMBLAGES; INVERTEBRATES; SCALE; MINERALOGY; ABUNDANCE;

D O I：

10.1016/j.ecss.2008.11.007

中图分类号：

Q17 [水生生物学];

学科分类号：

071004 ;

摘要：

The performances of two commonly used non-destructive sampling procedures for rocky benthic assemblages (i.e. photography and visually assessed quadrats) were compared. A damaging human activity, date mussel (Lithophaga lithophaga) harvesting (DMH), was chosen. Directly impacted sites were compared with reference conditions (controls). Both visual quadrats and photography were equally able to detect differences between impacted situations and controls. However, visual quadrats showed high variability among replicates and estimated higher species richness for controls, while photography did so for impacts. Pooling photos in a 'sum photo quadrat' showed that differences between the two methods are due to sampling unit size rather than sampling procedure itself. As a small sampling unit is unavoidable with photography, visual quadrats should be preferred in investigating shallow rocky reefs for their larger size: however, longer working time underwater with quadrats does not allow for numerous replicates. Pooling many photos to reach sampling sizes comparable with those of quadrats may be a valid alternative to reconcile image resolution and areal coverage. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：359 / 367

页数：9