Regular sea urchins as drivers of shallow benthic marine community structure

2020 ◽  
pp. 255-279
Author(s):  
Robert S. Steneck
Keyword(s):  
Community Structure ◽  
Sea Urchins ◽  
Marine Community

USING FOOD WEBS TO UNDERSTAND THE EFFECTS OF BIOTIC INVASION ON LATE ORDOVICIAN MARINE COMMUNITY STRUCTURE

2017 ◽  
Author(s):  
Hannah L. Kempf ◽  
◽  
Ian O. Castro ◽  
Carrie L. Tyler ◽  
Ashley A. Dineen ◽  
...  
Keyword(s):  
Community Structure ◽  
Food Webs ◽  
Late Ordovician ◽  
Biotic Invasion ◽  
Marine Community

scholarly journals Contrasting recruitment seasonality of sea urchin species in Gran Canaria, Canary Islands (eastern Atlantic)

2014 ◽  
Vol 15 (3) ◽  
pp. 475 ◽  
Author(s):  
S. GARCIA-SANZ ◽  
P. G. NAVARRO ◽  
F. TUYA
Keyword(s):  
Community Structure ◽  
Seasonal Variation ◽  
Sea Urchin ◽  
Sea Urchins ◽  
Late Summer ◽  
Paracentrotus Lividus ◽  
Abundant Species ◽  
Late Winter ◽  
Gran Canaria ◽  
Arbacia Lixula

Despite sea-urchins can play an important role affecting the community structure of subtidal bottoms, factors controlling the dynamics of sea-urchin populations are still poorly understood. We assessed the seasonal variation in recruitment of three sea-urchin species (Diadema africanum, Paracentrotus lividus and Arbacia lixula) at Gran Canaria Island (eastern Atlantic) via monthly deployment of artificial collectors throughout an entire annual cycle on each of four adjacent habitat patches (seagrasses, sandy patches, ‘urchin-grazed’ barrens and macroalgal-dominated beds) within a shallow coastal landscape. Paracentrotus lividus and A. lixula had exclusively one main recruitment peak in late winter-spring. Diadema africanum recruitment was also seasonal, but recruits appeared in late summer-autumn, particularly on ‘urchin-grazed’ barrens with large abundances of adult conspecifics. In conclusion, this study has demonstrated non-overlapping seasonal recruitment patterns of the less abundant species (P. lividus and A. lixula) with the most conspicuous species (D. africanum) in the study area.

scholarly journals Community structure of Echinoderms in seagrass beds of Pacitan beaches, East Java, Indonesia

2019 ◽  
Vol 20 (7) ◽  
Author(s):  
FARID KAMAL MUZAKI ◽  
EDWIN SETIAWAN ◽  
GHULAM FATHIR AUTHAR INSANY ◽  
NURUL KUSUMA DEWI ◽  
IWENDA BELLA SUBAGIO
Keyword(s):  
Species Richness ◽  
Community Structure ◽  
Sea Urchins ◽  
Diversity Index ◽  
Diversity Indices ◽  
Seagrass Beds ◽  
Sea Star ◽  
Echinometra Mathaei ◽  
Belt Transect ◽  
Diadema Setosum

Abstract. Muzaki FK, Setiawan E, Insany GFA, Dewi NK, Subagio IB. 2019. Community structure of Echinoderms in seagrass beds of Pacitan beaches, East Java, Indonesia. Biodiversitas 20: 1787-1793. In this study, we attempt to access diversity and community structure of Echinoderms on seagrass beds in each three belt transect (width 2 m, length 100 m) in Tawang and Pidakan beaches, Pacitan, East Java, Java. Observed parameters were species richness, composition, and abundance, as well as diversity indices: Shannon-Wiener's diversity index (H'), Simpson's dominance index (D) and Pielou's evenness index (J). At the end of the study, we identified one species of sea star (Asteroidea), seven species of brittle stars (Ophiuroidea), ten species of sea cucumbers (Holothuroidea) andnine species of sea urchins (Echinoidea). The most dominant species were Ophiocoma dentata (F. Ophiocomidae), Diadema setosum (F. Diadematiidae), Ophiomastix annulosa (F. Ophiocomidae) and Echinometra mathaei (F. Echinometridae). Value of H’ ranged from 0.538 to 1.252 in Tawang and 1.041 to 1.704 in Pidakan; which showing higher species richness and diversity in Pidakan. Echinoderm in the study area was not evenly distributed; D. setosum was very dominant in Tawang beach, while those three other species were more common in Pidakan. Furthermore, most of Holothuroid and Ophiuroid were found only in Pidakan which have relatively more complex habitat.

scholarly journals Bacterioplankton community structure: Protists control net production and the proportion of active bacteria in a coastal marine community

1996 ◽  
Vol 41 (6) ◽  
pp. 1169-1179 ◽  
Author(s):  
Paul A. del Giorgio ◽  
Josep M. Gasol ◽  
Dolors Vaqué ◽  
Paola Mura ◽  
Susana Agustí ◽  
...  
Keyword(s):  
Community Structure ◽  
Net Production ◽  
Bacterioplankton Community ◽  
Coastal Marine ◽  
Active Bacteria ◽  
Control Net ◽  
Marine Community

Succession, space and coral recruitment in a subtropical fouling community

1999 ◽  
Vol 50 (3) ◽  
pp. 235 ◽  
Author(s):  
S. J. L. Fairfull ◽  
V. J. Harriott
Keyword(s):  
Multivariate Analysis ◽  
Species Richness ◽  
Community Structure ◽  
Recruitment Rate ◽  
Coral Recruitment ◽  
Fouling Community ◽  
Eastern Australia ◽  
Coral Communities ◽  
Over Time ◽  
Marine Community

Patterns of recruitment and succession on ceramic settlement panels were examined in a subtidal marine community in eastern Australia to determine whether competition for settlement space with temperate biota was a factor potentially limiting the development of coral communities in a subtropical location. Replicate settlement panels were installed at Split Solitary Island (30˚S) in November 1992 and were destructively sampled after 1, 3, 5, 7, 10, 12, 16 and 29 months. Species richness and community structure data were analysed by non-parametric multivariate analysis. Space on panel surfaces was rapidly occupied; the upper surfaces by algae and the lower surfaces by bryozoans, ascidians and sponges, with a divergence of community structure over time. Of the 228 coral recruits identified on the panels, 98% were recorded on the upper surface of panels, in contrast to studies at most tropical sites where corals recruit predominantly to lower surfaces. Owing to the rapid settlement of other biota, free space for coral settlement was limited and this may account for the low coral recruitment rate recorded. High post-settlement mortality (>94%) of coral recruits over a 3-month period indicated the significance of post-settlement factors in accounting for low recruitment in settlement-panel studies.

scholarly journals Struktur Komunitas Landak Laut di Padang Lamun Pulau Kodingareng, Kepulauan Spermonde

2021 ◽  
Vol 24 (1) ◽  
pp. 63-70
Author(s):  
Wilma Moka ◽  
Dwi Fajriyati Inaku ◽  
Muhammad Rais
Keyword(s):  
Community Structure ◽  
Species Composition ◽  
Sampling Method ◽  
Marine Organism ◽  
Sea Urchins ◽  
Diversity Index ◽  
Seagrass Beds ◽  
Ecological Value ◽  
Tripneustes Gratilla ◽  
Diadema Setosum

Sea urchins is marine organism from Phylum Echinoderms which have high economic and ecological value. Therefore, we need data on the current condition of sea urchins, especially those in the Spermonde Islands. Through this research, it is hoped that the community structure and distribution of sea urchins in Kodingareng Lompo Island, Spermonde Islands can be known. The sampling method used was quadrant transects measuring 5x5 meters on 4 plots in the seagrass area on Kodingareng Lompo Island. The data analysis used was species composition, density, relative density, diversity index, and uniformity index. The results obtained show that there are three species of sea urchins, namely Diadema setosum, Mespilia globulus, and Tripneustes gratilla, basen on morphology identification. Diadema setosum is species with the highest species composition value, namely 92%. The density value (0.017 individuals / m2) and the diversity of sea urchins (H '<1) in the seagrass beds at Kodingareng Island are classified as low. It is hoped that the data obtained from this research can become a reference for the management of biological resources in the Spermonde Islands in the future. Landak laut merupakan salah satu kelas dari Filum Echinodermata yang memiliki nilai ekonomis dan ekologis yang cukup tinggi. Gonad landak laut telah sejak lama dikonsumsi di berbagai negara dunia, dan bahkan sekarang cangkangnya banyak dijadikan souvenir. Karena itu diperlukan data kondisi terkini landak laut, khususnya yang ada di Kepulauan Spermonde. Melalui penelitian ini diharapkan dapat diketahui struktur komunitas maupun sebaran landak laut yang ada di Padang Lamun Pulau Kodingareng Lompo, Kepulauan Spermonde. Metode sampling yang digunakan adalah transek kuadran ukuran 5x5 meter pada 4 plot pada daerah padang lamun di Pulau Kodingareng Lompo. Analisis data yang digunakan adalah komposisi jenis, kepadatan, kepadatan relatif, indeks keanekaragaman, dan indeks keseragaman. Hasil yang didapatkan memperlihatkan bahwa terdapat tiga genus landak laut, yaitu Diadema, Mespilia, dan Tripneustes. Diadema sp. merupakan genus dengan nilai komposisi jenis tertinggi yaitu 92%. Nilai kepadatan (0,017 individu/m2) dan keanekaragaman landak laut (H’<1) di padang lamun Pulau Kodingareng tergolong rendah. Data yang didapatkan dari penelitian ini diharapkan dapat menjadi bahan acuan untuk pengelolaan sumberdaya hayati di Kepulauan Spermonde ke depannya.

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