scholarly journals Hydrozoan colonization and succession in the tidal and subtidal zones in Surtsey during the period 1967 to 1984

2020 ◽  
Vol 14 ◽  
pp. 131-139
Author(s):  
Steffen Lundsteen ◽  
Erlingur Hauksson ◽  
Karl Gunnarsson
Keyword(s):  
Intertidal Zone ◽  
Marine Invertebrate ◽  
Subtidal Zone ◽  
Rocky Shores ◽  
Species Numbers ◽  
Number Of Species ◽  
Rocky Bottom ◽  
Floating Objects

This article reports on results of investigations of hydrozoans collected in Surtsey, Iceland in the period 1967 – 1984. Samples were collected in the intertidal zone and by divers in the subtidal zone down to 40 m. A list and illustrations of hydrozoan species found in the intertidal and subtidal rocky bottom in Surtsey are presented. Species numbers increased steadily during the study period and in 1984 a total of 37 species were recorded in Surtsey making hydrozoans one of the most diverse marine invertebrate groups in Surtsey. Among hydrozoans found during the study are 8 species not previously recorded in Iceland. Apart from dispersal by planktonic medusa, rafting of polyps on floating objects drifting to Surtsey is thought to be important for colonisation of hydrozoan fauna in Surtsey. At the end of the investigations period, 20 years after formation of rocky shores on the island, number of species seemed to be continually increasing

scholarly journals Species diversity, taxon structure and distribution of the Chlorophytes on Truong Sa archipelago

2020 ◽  
Vol 20 (4) ◽  
pp. 427-436
Author(s):  
Dam Duc Tien ◽  
Nguyen Thi Thu Hang ◽  
Phan Thu Hue ◽  
Tran Dinh Lan
Keyword(s):  
Species Diversity ◽  
Intertidal Zone ◽  
Similarity Coefficient ◽  
Subtidal Zone ◽  
Number Of Species ◽  
Total Species

The results of research on characteristic of distribution and taxa structure of Chlorophytes (Chlorophyta) at nine islands of Truong Sa archipelago (Truong Sa, Da Tay, Thuyen Chai, Toc Tan, Sinh Ton, Nam Yet, Song Tu Tay, Da Nam and Son Ca) indicate that there are 67 species of Chlorophytes, they belong to 4 orders, 14 families and 22 genera. The number of species at the sampling islands ranged from 13 species/island (Toc Tan isd.) to 43 species/island (Nam Yet isd.) with the average of 25.5 species/island. Sorensen similarity coefficient at the sampling sections ranged from 0.24 (between Song Tu Tay and Thuyen Chai) to 0.74 (between Nam Yet and Song Tu Tay) with the average of 0.45. Among 67 species in nine islands, there are 10 species distributed only in the intertidal zone (they are occupying 14.9% of total species), 14 species (31.4%) in subtidal zone only and 43 species (64.2%) in both intertidal zone and subtidal zone. The number of species concentrates on some genera (Halimeda: 10 species; Caulerpa: 10 species; Codium: 6 species,...), they belong to Codiacea, Siphonales. There are some genera with only 1 species (Tydemania, Anadyomene, Microdictyon,...).

scholarly journals Marine invertebrate and seaweed biodiversity of continental coastal Ecuador

2020 ◽  
Vol 8 ◽  
Author(s):  
Maritza Cárdenas-Calle ◽  
Elba Mora ◽  
Genoveva Torres ◽  
Julián Pérez-Correa ◽  
Gregorio Bigatti ◽  
...  
Keyword(s):  
Protected Areas ◽  
Intertidal Zone ◽  
Large Scale ◽  
Marine Invertebrate ◽  
Benthic Communities ◽  
Biological Data ◽  
Rocky Shores ◽  
Macroinvertebrate Communities ◽  
The Status

This study summarises the diversity of living macroinvertebrates and seaweeds from the intertidal and subtidal rocky shores along Ecuadorian continental coast. Benthic macroinvertebrate communities and seaweeds were quantified over quadrants (50 × 50 cm) randomly placed on transects of 50 m length. A checklist of 612 species was generated: 479 species of macroinvertebrates and 133 species of seaweeds. Groups recorded were Mollusca (184 species), Cnidaria (70), Arthropoda (68), Annelida (60), Echinodermata (42), Chordata (18), Bryozoa (13), Porifera (22), Sipuncula (2), Brachiopoda and Platyhelminthes (only identified as morphotypes). The seaweeds were represented by Rhodophyta (78), Chlorophyta (37), Ochrophyta (13), Cyanobacteria (5) and 19 biotic complexes. Furthermore, 22 new taxa and six alien species were recorded from the intertidal zone. This study provides the first large scale report of benthic communities in different marine coastal ecosystems in mainland Ecuador, covering 1,478 km2 of protected areas and 382 km2 of non-protected areas. The highest benthic diversity was registered in the protected areas and rocky shores from the intertidal zone. The biological data, herein reported, are useful for a long-term monitoring programme to evaluate the status of conservation and to detect rapid changes in the benthic biodiversity from coastal areas.

scholarly journals Preliminary Study on Fish Larvae at Selected Coastal Waters of Sarawak

1970 ◽  
Vol 4 (2) ◽  
pp. 1-8
Author(s):  
Norhakimi Muhamad ◽  
Siti Akmar Khadijah Ab Rahim
Keyword(s):  
Coastal Waters ◽  
Intertidal Zone ◽  
Larval Dispersal ◽  
Sampling Methods ◽  
Fish Larvae ◽  
Mesh Size ◽  
Subtidal Zone ◽  
Preliminary Study ◽  
Study Sites

A survey were carried out from April to November 2012 at five study sites namely Teluk Pandan beach, Rambungan beach, Puteri beach, Sampadi Island and Satang Besar Island, Sarawak. This survey was carried out in order to obtain early documentation of fish larvae at selected coastal waters of Sarawak. Seine net (1 mm mesh size) which was pulled by two persons at intertidal zone; and bridle net (0.5 mm mesh size) that was towed by boat at subtidal zone (Sampadi Island only) were used to collect the samples. A total of 2,562 fish larvae which comprise 25 families were obtained from both sampling methods. A total of 16 families of fish larvae were caught by seine net from the intertidal zone. The same number of families was collected at the subtidal zone of Sampadi Island by bridle net. Ambassidae, Clupeidae, Engraulidae and Gerreidae found to be dominant families in the study sites. Clupeidae and Gerreidae shown a wide larval dispersal area because they were collected at all study sites. These findings seem to indicate that the subtidal zone of Sampadi support more species of fish larvae.

A checklist of freshwater algae from Mt. Sinbul alpine wetlands in South Korea

Nova Hedwigia ◽  
2020 ◽  
Vol 111 (1) ◽  
pp. 1-38
Author(s):  
Han Soon Kim ◽  
Jae Hak Lee ◽  
Jin Hee Kim
Keyword(s):  
South Korea ◽  
New Taxa ◽  
Late Spring ◽  
Freshwater Algae ◽  
Algal Communities ◽  
Species Numbers ◽  
Algal Diversity ◽  
Number Of Species ◽  
Algal Groups ◽  
First Time

The present study summarized the freshwater algal diversity from Mt. Sinbul alpine wetlands in South Korea from March 2013 to December 2019. We identified a total of 183 taxa belong to seven main algal groups (Charophyta, Chlorophyta, Cyanophyta, Chrysophyta, Cryptophyta, Dinophyta and Euglenophyta). The algal communities were characterized by high species numbers of the desmids making up 108 taxa. It was examined that the number of species was higher during late spring and summer. Among them, a total of 53 taxa of 40 desmid species (Charophyta) including 4 new taxa (Actinotaenium crassiusculum var. minutum var. nov., Cosmarium vitiosum var. koreanum var. nov., Groenbladia neglecta var. longa var. nov., Staurodesmus koreanus sp. nov.), 5 species of Chlorophyta, 7 species of Chrysophyta and 1 species of Cyanophyta have been recorded for the first time in Korea.

scholarly journals Hydroids (Cnidaria, Hydrozoa) of the intertidal zone of Governador and Paquetá islands, Guanabara Bay, Rio de Janeiro, Brazil

2009 ◽  
Vol 99 (3) ◽  
pp. 291-294 ◽  
Author(s):  
Priscila A. Grohmann
Keyword(s):  
Intertidal Zone ◽  
Rio De Janeiro ◽  
Industrial Complex ◽  
Guanabara Bay ◽  
Number Of Species

During six consecutive months, sampling were made at three points located on Governador Island and three on Paquetá Island in Guanabara Bay, Rio de Janeiro, Brazil. Material was collected from dock pilings and rocks in the intertidal zone. In these samples, five species belonging to three families, Corynidae, Kirchenpaueriidae and Campanulariidae, were identified. The campanulariid species Obelia dichotoma Linnaeus, 1758, dominated at nearly all points sampled. The small number of species obtained in this survey is attributed to the intense pollution in the bay, which borders the second-largest industrial complex and the second-largest demographic center of Brazil.

scholarly journals Seasonal occurrence of Japanese pygmy octopus Octopus parvus in the intertidal zone

2021 ◽  
Author(s):  
Yuta Yamate ◽  
Takumi Ohya ◽  
Toshifumi Wada ◽  
Takeshi Takegaki
Keyword(s):  
Intertidal Zone ◽  
Feeding Habits ◽  
Gonadal Development ◽  
Hermit Crabs ◽  
Seasonal Occurrence ◽  
Subtidal Zone ◽  
Intertidal Zones ◽  
Body Sizes ◽  
Similar Body ◽  
Traditional Fishing

AbstractThe Japanese pygmy octopus Octopus parvus is a small octopus that occurs commonly along the coast of southern Japan, and is caught using traditional fishing methods. To date, however, there have been no studies on the ecology of this species. In this study, we investigated the annual seasonal occurrence of O. parvus in the intertidal zone of Fukue Island, Nagasaki, Japan, and examined the growth, maturation, and feeding habits of this octopus. We accordingly found that the octopus inhabits the intertidal zone of the study site from August to January, during which time it appears to move from the high to low intertidal zone, and subsequently migrates to the subtidal zone. During low tide at night in the intertidal zone, we observed that the octopuses actively captured and fed on prey, such as fish, crabs, hermit crabs, shrimp, snails, and bivalves. Both males and females were found to be characterized by similar body sizes and growth, although gonadal development occurs relatively earlier in males. However, any mating or brooding behaviors were not observed during the course of the study. Our observations thus indicate that O. parvus uses intertidal zones as feeding grounds for rapid growth and maturation, and may thereafter move to the subtidal zone for spawning.

Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species

Zootaxa ◽  
2010 ◽  
Vol 2680 (1) ◽  
pp. 1 ◽  
Author(s):  
EIJIROH NISHI ◽  
JULIE HELEN BAILEY-BROCK ◽  
ANDRE SOUZA DOS SANTOS ◽  
HIROYUKI TACHIKAWA ◽  
ELENA K. KUPRIYANOVA
Keyword(s):  
New Species ◽  
Shallow Waters ◽  
Subtidal Zone ◽  
Rocky Shores ◽  
Type Specimens ◽  
Boso Peninsula ◽  
The Pacific ◽  
Pacific Side ◽  
Head Morphology ◽  
Far Eastern

A new species of the genus Sabellaria Lamarck, 1812, is described from shallow waters off Onjuku, the Pacific side of Boso Peninsula, Chiba, Japan. Sabellaria isumiensis n. sp. is a gregarious species building colonies of tubes made of sand and shell debris over 2 m wide in the intertidal to subtidal zone of the rocky shores. The new species is distinguished by the character combination of having 1 or 2 pairs of nuchal spines, median teeth of outer paleae with 3–5 lateral spines, two kinds (long and short) of opercular paleae in the middle row of the crown, with slender blades of long ones curved outward. Morphological features of the species are described in details and compared to those of congeners from Japan and world-wide. We re-describe three poorly known sabellariid species, Sabellaria javanica Augener, 1934 from Java, Indonesia, S. chandraae de Silva, 1961 from Galle Force, Sri Lanka, and Neosabellaria uschakovi Kirtley, 1994 from the Far Eastern Seas of Russia. The descriptions are based on the type specimens, and we particularly emphasize the head morphology and paleal characters. We provide a summary of diagnostic characters in the genus Sabellaria and propose new morphological groupings that later will be tested in the framework of a formal phylogenetic analysis.

scholarly journals 14C Dating of Modern Marine and Estuarine Shellfish

Radiocarbon ◽  
1997 ◽  
Vol 40 (2) ◽  
pp. 975-984 ◽  
Author(s):  
A. G. Hogg ◽  
T. F. G. Higham ◽  
J. Dahm
Keyword(s):  
New Zealand ◽  
Intertidal Zone ◽  
Radiocarbon Dating ◽  
Subtidal Zone ◽  
14C Dating ◽  
Marine Molluscs ◽  
C Distribution ◽  
Rocky Coast

We measured the 14C content of 36 living marine molluscs from Tairua Harbour and the rocky coast on the Coromandel Peninsula of New Zealand. We identified species suitable for radiocarbon dating and show that the open marine intertidal zone is enriched in 14C compared to the open marine subtidal zone or estuary. We also found a uniform 14C distribution in the Tairua Harbour, by analyzing samples of the estuarine bivalve Austrovenus stutchbwyi collected up to 5 km from the harbor entrance.

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