SEDIMENT DISTURBANCE AND LOSS OF BETA DIVERSITY ON SUBTIDAL ROCKY REEFS

Ecology ◽  
2007 ◽  
Vol 88 (10) ◽  
pp. 2455-2461 ◽  
Author(s):  
David Balata ◽  
Luigi Piazzi ◽  
Lisandro Benedetti-Cecchi
Keyword(s):  
Beta Diversity ◽  
Sediment Disturbance ◽  
Rocky Reefs ◽  
Subtidal Rocky Reefs

Consistency of faunal and floral assemblages within temperate subtidal rocky reef habitats

2001 ◽  
Vol 52 (6) ◽  
pp. 853 ◽  
Author(s):  
T. D. O'Hara
Keyword(s):  
Environmental Heterogeneity ◽  
Rocky Reef ◽  
Multivariate Statistical Analyses ◽  
Multivariate Statistical ◽  
Faunal Assemblages ◽  
Rocky Reefs ◽  
Macrobenthic Assemblages ◽  
Eastern Australia ◽  
Subtidal Rocky Reefs ◽  
Taxonomic Groups

Habitats defined by various biological and environmental variables are increasingly assumed to be surrogates for biodiversity. This study tested this assumption for temperate subtidal rocky reefs off south-eastern Australia by investigating the consistency of floral and faunal macrobenthic assemblages within habitats defined by dominant vegetation, substratum lithology, depth, wave exposure and region. Taxonomic groups included seagrasses, rhodophytes, chlorophytes, phaeophytes, hydroids, bryozoans, molluscs, polychaetes, pycnogonids and echinoderms. The results from multivariate statistical analyses indicated that, although variation between replicate samples is high, habitats as defined by dominant vegetation and, to a lesser extent, region supported consistent floral and faunal assemblages. The patterns did not emphasize a broad-scale biogeographic gradient, but rather the environmental heterogeneity of the coastline at scales of 10–100 km.

scholarly journals Environmental DNA reveals the fine-grained and hierarchical spatial structure of kelp forest fish communities

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Thomas Lamy ◽  
Kathleen J. Pitz ◽  
Francisco P. Chavez ◽  
Christie E. Yorke ◽  
Robert J. Miller
Keyword(s):  
Beta Diversity ◽  
Aquatic Ecosystems ◽  
Species Turnover ◽  
Spatial Scales ◽  
Regional Scale ◽  
Kelp Forest ◽  
Fish Communities ◽  
Environmental Dna ◽  
Underwater Visual Census ◽  
Rocky Reefs

AbstractBiodiversity is changing at an accelerating rate at both local and regional scales. Beta diversity, which quantifies species turnover between these two scales, is emerging as a key driver of ecosystem function that can inform spatial conservation. Yet measuring biodiversity remains a major challenge, especially in aquatic ecosystems. Decoding environmental DNA (eDNA) left behind by organisms offers the possibility of detecting species sans direct observation, a Rosetta Stone for biodiversity. While eDNA has proven useful to illuminate diversity in aquatic ecosystems, its utility for measuring beta diversity over spatial scales small enough to be relevant to conservation purposes is poorly known. Here we tested how eDNA performs relative to underwater visual census (UVC) to evaluate beta diversity of marine communities. We paired UVC with 12S eDNA metabarcoding and used a spatially structured hierarchical sampling design to assess key spatial metrics of fish communities on temperate rocky reefs in southern California. eDNA provided a more-detailed picture of the main sources of spatial variation in both taxonomic richness and community turnover, which primarily arose due to strong species filtering within and among rocky reefs. As expected, eDNA detected more taxa at the regional scale (69 vs. 38) which accumulated quickly with space and plateaued at only ~ 11 samples. Conversely, the discovery rate of new taxa was slower with no sign of saturation for UVC. Based on historical records in the region (2000–2018) we found that 6.9 times more UVC samples would be required to detect 50 taxa compared to eDNA. Our results show that eDNA metabarcoding can outperform diver counts to capture the spatial patterns in biodiversity at fine scales with less field effort and more power than traditional methods, supporting the notion that eDNA is a critical scientific tool for detecting biodiversity changes in aquatic ecosystems.

scholarly journals Development of a biological condition assessment index for shallow, subtidal rocky reefs in Southern California, USA

2018 ◽  
Vol 39 ◽  
pp. e12471 ◽  
Author(s):  
Julia H. Coates ◽  
Kenneth Schiff ◽  
Raphael D. Mazor ◽  
Daniel J. Pondella ◽  
Rebecca Schaffner ◽  
...  
Keyword(s):  
Southern California ◽  
Condition Assessment ◽  
Biological Condition ◽  
Assessment Index ◽  
Rocky Reefs ◽  
Shallow Subtidal ◽  
Subtidal Rocky Reefs

Early life history traits of the blenny Auchenionchus crinitus (Teleostei: Labrisomidae) off northern Chile

2018 ◽  
Vol 99 (4) ◽  
pp. 969-974 ◽  
Author(s):  
Mauricio F. Landaeta ◽  
Valentina Nowajewski ◽  
Lissette D. Paredes ◽  
Claudia A. Bustos
Keyword(s):  
Life History ◽  
Early Life ◽  
Life History Traits ◽  
Seawater Temperature ◽  
Early Life History ◽  
Lunar Cycle ◽  
Larval Abundance ◽  
Northern Chile ◽  
Rocky Reefs ◽  
Subtidal Rocky Reefs

AbstractThe early life history traits of the labrisomid blenny Auchenionchus crinitus (Jenyns, 1842) from subtidal rocky reefs were studied, based on microstructure analysis of sagittae of their pelagic larvae (4.01 mm NL −12.50 mm SL). Ichthyoplankton was collected in shallow (<20 m) nearshore waters off Isla Santa María, Antofagasta, northern Chile every 15 days during austral autumn–winter 2014 (five sampling days). During late May and early June, larval abundance was low (median ± MAD, 39.06 ± 5.08 ind. 100 m−3), increasing significantly during mid-June to early August (110.98 ± 47.66 ind. 100 m−3). Using 354 sagittae, the back-calculated hatch dates indicated the occurrence of three hatching events, two in autumn and one in winter. Hatching occurred mainly during the illuminated phases of the lunar cycle. All three batches had similar estimated larval sizes at hatch (3.2–3.7 mm SL), as well as similar growth rates (0.19–0.22 mm day−1) during the first 30 days of life. During the study period, shallow waters were well mixed, with seawater temperature of 14.73 ± 0.58°C and salinity of 34.84 ± 0.04. This is the first estimation of early life history traits of this cryptobenthic species from rocky reefs of Chile.

Depth-related drivers of benthic community structure on shallow subtidal rocky reefs

2022 ◽  
pp. 107743
Author(s):  
Marcelo Checoli Mantelatto ◽  
Lélis Antonio Carlos-Júnior ◽  
Carolina Côrrea ◽  
Carlos Ferreira de Lima Cardoso ◽  
Joel Christopher Creed
Keyword(s):  
Community Structure ◽  
Benthic Community ◽  
Benthic Community Structure ◽  
Rocky Reefs ◽  
Shallow Subtidal ◽  
Subtidal Rocky Reefs

Species Interactions and Regime Shifts in Intertidal and Subtidal Rocky Reefs of the Mediterranean Sea

2019 ◽  
pp. 190-213
Author(s):  
Lisandro Benedetti-Cecchi ◽  
Laura Airoldi ◽  
Fabio Bulleri ◽  
Simonetta Fraschetti ◽  
Antonio Terlizzi
Keyword(s):  
Mediterranean Sea ◽  
Species Interactions ◽  
Regime Shifts ◽  
Rocky Reefs ◽  
The Mediterranean ◽  
Subtidal Rocky Reefs

scholarly journals Artificial crevice habitats to assess the biodiversity of vagile macro-cryptofauna of subtidal rocky reefs

2008 ◽  
Vol 59 (8) ◽  
pp. 661 ◽  
Author(s):  
Mateus de A. Baronio ◽  
Daniel J. Bucher
Keyword(s):  
River Discharge ◽  
New South ◽  
Benthic Communities ◽  
East Australian Current ◽  
Kelp Beds ◽  
Rocky Reefs ◽  
South Wales ◽  
Different Seasons ◽  
Differential Exposure ◽  
Subtidal Rocky Reefs

Reef cryptofauna (animals inhabiting cracks and crevices) represent much of a reef’s biodiversity yet are seldom studied owing to their inaccessibility. Subtidal rocky reefs off Brunswick Heads and Byron Bay in northern New South Wales, Australia support benthic communities ranging from coral-dominated offshore reefs to kelp beds of Ecklonia radiata on inshore reefs. It was hypothesised that differential exposure to river discharge and the East Australian Current, as well as proximity to other reef habitats, may produce differences in recruitment and persistence of cryptofauna between superficially similar reefs within a small geographical range. Artificial crevice habitats were deployed at similar depths on three inshore reefs supporting similar Ecklonia densities. Although the species richness of crevice fauna was similar at all reefs, the species composition differed significantly along with the assemblages recruited in different seasons and to different crevice sizes. Neither reef faunas nor that of varying crevice sizes changed consistently with the seasons, yet all crevices appeared equally accessible to colonists. These results demonstrate the potential inadequacy of classifying reef communities for management of regional biodiversity based on the visual dominance of a few species that may not be as sensitive to environmental variables as many of the less obvious taxa.

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