scholarly journals The diversity of marine invertebrate macrofauna in selected rocky intertidal zones of Matara, Sri Lanka

2021 ◽  
pp. 15-21
Author(s):  
M.P. Wickramasinghe ◽  
◽  
K.A.M. Sudarshani ◽  
H.C.E. Wegiriya ◽  
Keyword(s):  
Marine Invertebrate ◽  
High Tide ◽  
Similarity Index ◽  
Abundant Species ◽  
Rocky Intertidal ◽  
Line Transect ◽  
Rocky Shores ◽  
Tidal Zone ◽  
Intertidal Zones ◽  
Macroinvertebrate Fauna

The present study was conducted in intertidal rocky shores at Wellamadama and Kamburugamuwa of Matara district from June to November 2018. A line transect method was employed perpendicular to the shore and randomly placed quadrats were used to identify and quantify the species. Collectively 34 species of intertidal macroinvertebrate fauna were identified. Shanon-Weiner index, Menhinick’s index, and Pielou’s index for Wellamadama were 1.8271, 0.5612, and 0.7620 respectively, while those in Kamburugamuwa were 1.9281, 0.4307, and 0.7517. Higher species diversity was recorded at the rocky shores of Kamburugamuwa, while higher species richness and evenness at Wellamadama rocky shores. The Jaccard similarity index indicates a low similarity (<50%) between two study rocky shores. Clypidina notata, Cellana rota, and Patelloida striata were the dominant species in the low tide zone. Highly abundant species in mid tidal zone at Wellamadama was Nodilittorina quadricincta, while that of in mid-tide zone at Kamburugamuwa was Chiton sp. Periwinkle snails were dominating the high tide zone of both study rocky shores of which Nodilittorina trochoides dominated at Wellamadama and Littoraria undulata dominated at Kamburugamuwa. The study indicates that community assemblages in intertidal rocky shores vary spatially and comprehensive studies are essential to investigate the controlling factors.

scholarly journals REDE ECOLÓGICA DOS GASTRÓPODES ASSOCIADOS AO BANCO DE ALGAS DA PRAIA DA RIBANCEIRA, SANTA CATARINA, BRASIL

2021 ◽  
Vol 25 (01) ◽  
pp. 47-58
Author(s):  
Renato Colares ◽  
◽  
Thuany Machado ◽  
Filipe Machado Patel ◽  
Natália da Silva Brunelli ◽  
...  
Keyword(s):  
Structural Complexity ◽  
Niche Overlap ◽  
Multivariate Techniques ◽  
Rocky Shores ◽  
Wet Season ◽  
Santa Catarina ◽  
Tidal Zone ◽  
Intertidal Zones ◽  
Key Species ◽  
Sargassum Cymosum

Among the rocky shores’ biota, the networks of interaction between macroalgae and associated organisms, especially gastropods, stand out. In order to contribute to the understanding of the ecology of rocky shores, this study aims to evaluate the relation between macroalgae and associated gastropods in Ribanceira Beach, Imbituba, Santa Catarina, Brazil. The survey of algae samples took place in a wet season, using 20 cm x 20 cm quadrants, allocated in 18 transects distributed equally in the infra and mesolittoral zones, with five points each. In the laboratory, algae were screened and associated gastropods identified. Concepts of network theory were applied for a better understanding of interactions among organisms, where connectance descriptors, niche overlap and centrality index for each species were calculated. Multivariate techniques were used to assess the significance of intertidal zones, morphofunctional group and other variables in the composition of the associated gastropods. The sampling resulted in a total of 1.466 gastropods, distributed in 14 species and nine families. In relation to the macroalgae, 14 species were identified, with seven presenting associated gastropods. The ecological network showed low connectance and niche overlap for both levels (gastropods and macroalgae), suggesting the existence of many specific interactions. The centrality values highlighted Eulithidium affine (C.B. Adams, 1850) and Sargassum cymosum C. Agardh as key species in the studied network. The mass and morphofunctional group of the macroalgae sampled showed influence in the composition of the associated community. Cortical algae, especially S. cymosum, stood out with high levels of species richness and species density of associated gastropods, suggesting importance in the structural complexity of macroalgae for gastropods. The non-significant effect of the tidal zone for the gastropod composition was highlighted, suggesting that the nesting and foraging stability provided by the macroalgae allows the same gastropod species to occur in both infralittoral and mesolittoral zones.

Ontogenetic changes in habitat use and diet of the sea-star Heliaster helianthus on the coast of central Chile

2009 ◽  
Vol 90 (3) ◽  
pp. 537-546 ◽  
Author(s):  
Tatiana Manzur ◽  
Mario Barahona ◽  
Sergio A. Navarrete
Keyword(s):  
Habitat Use ◽  
Rocky Intertidal ◽  
Strong Interactions ◽  
Rocky Shores ◽  
Sea Star ◽  
Ontogenetic Changes ◽  
Central Chile ◽  
Intertidal Zones ◽  
Early Stages ◽  
Marine Benthic Invertebrates

Ontogenetic shifts in habitat use and diet are ubiquitous in nature and usually have profound consequences for the ecology and evolution of the species. In the case of species with strong interactions within their communities, such as keystone predators, understanding this kind of size-related change is critical to understand variation and connectivity among spatially distinct habitats of coastal communities. Yet the ecology of early life stages of marine benthic invertebrates, particularly asteroids, is poorly understood. Here we describe the results of surveys to characterize the habitat and quantify the abundance and diet of recruits of the sun star Heliaster helianthus, a keystone predator at rocky intertidal sites in central Chile. Our results support the existence of size-related, ontogenetic changes in habitat use and diet of this species. Recruits occupy boulders and crevices in the high or mid-high intertidal zones of wave-protected habitats and as they grow they move down towards lower tidal levels. Adults are characteristically found in the low intertidal zone of wave exposed and semi-exposed habitats. These changes in habitat use are accompanied by changes in diet composition and particularly by a broadening of the prey species incorporated in the diet. Since early stages of Heliaster appear to be most sensitive to predation and abiotic stress and since adults are such important predators in wave exposed rocky shores, knowledge of the basic ecology of early stages of this species is critical to fully understand the dynamics of intertidal communities.

Use of rocky intertidal pools by shrimp species in a temperate area

Biologia ◽  
2015 ◽  
Vol 70 (3) ◽  
Author(s):  
Catarina Vinagre ◽  
Marta Dias ◽  
Catarina Fonseca ◽  
Maria T. Pinto ◽  
Henrique N. Cabral ◽  
...  
Keyword(s):  
Size Structure ◽  
Atlantic Coast ◽  
Abundant Species ◽  
Rocky Intertidal ◽  
Rocky Shores ◽  
Portuguese Coast ◽  
Shrimp Species ◽  
Palaemon Macrodactylus ◽  
The Baltic ◽  
Tidal Pools

AbstractRocky shores are among the most-intensively studied ecosystems, however, tidal pools remain relatively understudied. This study aims to investigate the habitat use and dynamics of the shrimp species that occur in tidal pools of a North-eastern Atlantic coast, the Portuguese coast, in particular species composition, abundance, seasonality and size structure. Shrimps were sampled monthly from six tidal pools for one year, in the west Portuguese coast. Species diversity was much higher than that found in previous studies, in other parts of the world. The shrimp population comprised 8 species: the European rock shrimp, Palaemon elegans, the common prawn, Palaemon serratus, the Atlantic ditch shrimp, Palaemon varians, the Baltic prawn, Palaemon adspersus, the Oriental shrimp, Palaemon macrodactylus and the relatively rare shrimps Eualus sollaudi, Eualus drachi and Caridion gordoni. Shrimp populations varied seasonally and among pools, with peak numbers in spring and summer. The most abundant species was P. elegans. P. elegans was present in all pools, throughout most of the year. Rare and exotic species were present mostly in spring-summer. Lower mean sizes of all shrimp were registered in the beginning of spring, most often in April or May, and gradually increased until winter. New-recruits of the most abundant species, P. elegans, generally entered the pools in spring and formed a high proportion of the population between April and August. They were responsible for the highest abundance peaks of shrimps occurring in the pools. The species richness and high numbers of juveniles occurring in tidal pools suggest that these environments may be nursery areas for coastal shrimp.

scholarly journals Distribution pattern and community structure of zoanthids (Zoantharia) along the coast of Saurashtra, Gujarat, India

2015 ◽  
Vol 96 (8) ◽  
pp. 1577-1584 ◽  
Author(s):  
Sonia Kumari ◽  
P.U. Zacharia ◽  
V. Kripa ◽  
K.R. Sreenath ◽  
Grinson George
Keyword(s):  
Community Structure ◽  
High Tide ◽  
Environmental Parameters ◽  
Distribution Patterns ◽  
Abundant Species ◽  
Intertidal Zones ◽  
Climate Change Effects ◽  
New Information ◽  
Saurashtra Coast ◽  
Line Intercept

Coral reef environments support a great diversity of benthic organisms, of which zoanthids form an integral part. Studies have been carried out regarding the degradation of coral reefs and changes in community structure under the present dynamics of climatic change. Zoanthids are dominant among the observed fauna in these degrading reef ecosystems. Zoanthids are observed at mid and lower intertidal zones beyond 20 m from highest high tide level. In the present study, distribution patterns of zoanthid species along three coastal villages of Saurashtra coast, Gujarat were studied. Line intercept transect method was performed to assess the zoanthid coverage. A total of seven species of zoanthids were recorded during the survey. Palythoa mutuki formed the abundant species in the area with 45.99% coverage, followed by Zoanthus sansibaricus with 33.67% and Zoanthus cf. sansibaricus with 12.26% coverage. Abiotic parameters (sea surface temperature, salinity, dissolved oxygen, pH) and nutrient data (ammonia, phosphate, total suspended solids and nitrate) were also recorded during sampling to determine their influence on zoanthid colonies. Higher levels of DO were found to favour the growth of Palythoa mutuki and Isaurus tuberculatus, whereas increased SST was tolerated by Palythoa tuberculosa only. Ammonia and phosphate were negatively impacting the growth of Palythoa mutuki and Zoanthus spp. The study provides new information on quantitative zoanthid distribution and the dynamic changes exhibited by zoanthids in relation to various environmental parameters. Zoanthids could be looked upon as an adaptive species which may support reef resurgence in degraded reefs under stress from climate change effects.

scholarly journals Population dynamics of two sympatric intertidal fish species (the shanny, Lipophrys pholis and long-spined scorpion fish, Taurulus bubalis) of Great Britain

2016 ◽  
Vol 98 (3) ◽  
pp. 589-595 ◽  
Author(s):  
C.J. Barrett ◽  
M.L. Johnson ◽  
S.L. Hull
Keyword(s):  
Population Dynamics ◽  
Great Britain ◽  
Fish Species ◽  
Gadus Morhua ◽  
Sympatric Species ◽  
Rocky Intertidal ◽  
Melanogrammus Aeglefinus ◽  
Intertidal Zones ◽  
Spatio Temporal ◽  
Scorpion Fish

The shanny/common blenny (Lipophrys pholis) and long-spined scorpionfish/bullhead (Taurulus bubalis) are commonly encountered, sympatric species within much of Great Britain's rocky intertidal zones. Despite being prey items of the cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) respectively, and both contributors to the diet of the near-threatened European otter (Lutra lutra), little is known on the population dynamics of the temperate specimens of Great Britain. It is further less known of the degrees of sympatricity between the two fish species and to what extent they are able to coexist. The current study examines spatio-temporal distributions and abundances at various resolutions: monthly population dynamics of both species along England's Yorkshire coast and seasonal population dynamics along the Yorkshire coast and around the Isle of Anglesey, Wales. Studies of their abundances, sizes, degrees of rock pool co-occurrence and diel activities are further examined, which indicate coexistence is maintained when interspecific co-occurrence takes place only between specimens of similar sizes, thus demoting size-related dominance hierarchies.

Palmaria hecatensis sp. nov. (Rhodophyta, Palmariales) from British Columbia and Alaska with a survey of other Palmaria species

1985 ◽  
Vol 63 (3) ◽  
pp. 474-482 ◽  
Author(s):  
Michael W. Hawkes
Keyword(s):  
British Columbia ◽  
Pacific Ocean ◽  
Geographical Distribution ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Aleutian Islands ◽  
Rocky Shores ◽  
Intertidal Zones ◽  
The North ◽  
The North Pacific

Palmaria hecatensis sp. nov. is described based on material from northern British Columbia. Male gametophytes and tetrasporophytes are thick, coriaceous, flattened blades, linear to lobed in habit and arise from an extensive encrusting basal holdfast. Putative female gametophytes are microscopic multicellular discs. Palmaria hecatensis grows on rocky shores in the midintertidal to lower intertidal zones and has a known geographical distribution from Nootka Island, Vancouver Island, B.C., to Shemya Island in the Aleutian Islands, Alaska. Palmaria hecatensis is compared with other species in the genus and, in addition, another distinctive (and possibly undescribed) Palmaria species from British Columbia and Alaska is discussed, bringing the total number of Palmaria species reported in the North Pacific Ocean to six.

scholarly journals Method for monitoring intertidal communities in a steep rocky shore: a combination of digital image technology and field operational strategy

2007 ◽  
Vol 55 (1) ◽  
pp. 19-27 ◽  
Author(s):  
Danuza Nogueira Moysés ◽  
Andréa de Oliveira R. Junqueira ◽  
Helena Passeri Lavrado ◽  
Sérgio Henrique Gonçalves da Silva
Keyword(s):  
Digital Image ◽  
Field Work ◽  
Benthic Invertebrate ◽  
Rocky Intertidal ◽  
Estimation Methods ◽  
Rocky Shores ◽  
Percent Cover ◽  
Intertidal Communities ◽  
Time Reproduction ◽  
Over Time

This paper introduces a method for temporal studies of steep rocky intertidal communities. It combines the use of digital image technology with field methodology, so that a wide area of the community can be sampled in a short time. Two current nondestructive percent cover estimation methods (visual estimation and point intersection) were compared in terms of cost, operational advantages and data quality, with a proposed method for a sucessional study . The proposed method used sequential photos to sample multiple fixed vertical transects over time. Reproduction of the mid-intertidal transect over time was possible by overlaying temporal transects in an image editing program. This method was similar to the point intersection quadrat method used to estimate percent cover. Benefits included reduced time on field work, economic advantages and other advantages of using digital photography, such as recording. Temporal photography of transects provided measurements of recruitment, mortality and population growth, and made it possible to manufacture an animation of sucessional stages. We suggest that this is the best method for providing information and understanding on the process of succession and for monitoring benthic invertebrate intertidal communities on steep rocky shores.

scholarly journals Temporal Distribution of Gastropods In Rocky Intertidal Area In North Manokwari, West Papua

2019 ◽  
pp. 1
Author(s):  
Dandi Saleky ◽  
Simon P.O Leatemia ◽  
Yuanike Yuanike ◽  
Irman Rumengan ◽  
I Nyoman Giri Putra
Keyword(s):  
Community Structure ◽  
Distribution Pattern ◽  
Similarity Index ◽  
Temporal Distribution ◽  
Population History ◽  
Rocky Intertidal ◽  
Systematic Sampling ◽  
Intertidal Area ◽  
Ecological Features ◽  
West Papua

Gastropods is an important organism that commonly found inhabiting the rocky intertidal area. Distribution pattern of this species is influenced by various factors such as population history, microhabitat, predation and a complex interactions between oceanographic dynamics and ecological features. This study aims to compare the temporal distribution pattern of gastropods at two different rocky intertidal area. This research was conducted at the rocky intertidal area of Amban and Nuni, North Manokwari District, West Papua. Data collection was performed during the daylight and night in April and June 2012 using systematic sampling method. The results showed that both physical and chemical factors are suite for supporting gastropods life. Furthermore, these factors seem to have an impact on gastropod zoning patterns observed in the study area. The similarity index values ​​indicate that the similarity of gastropod species between the two locations is low, which means that the species of gastropods found in each location is quite different. The community structure of gastropod at the study area is stable. In addition, we found that the gastropods diversity were higher during the night than the daylight because gastropods are classified as a nocturnal animals. Key Words: Gastropod; Rocky Intertidal; Community Structure; Nocturnal

scholarly journals Sea cucumber community in the coastal area of the Bahoi Village,West Likupang Sub-district, North Minahasa District

2020 ◽  
Vol 8 (1) ◽  
pp. 37
Author(s):  
Andia Tri Fritama Lumbu ◽  
Lawrence J. L. Lumingas ◽  
Gaspar D. Manu
Keyword(s):  
Sea Cucumber ◽  
Diversity Index ◽  
Similarity Index ◽  
Sampling Technique ◽  
Distribution Patterns ◽  
Line Transect ◽  
Dominance Index ◽  
Holothuria Scabra ◽  
Research Site ◽  
Holothuria Atra

This research is conducted in the coastal waters of Bahoi Village, West Likupang Sub-district, North Minahasa District with the aims to know the types of sea-related environmental factors in the research site and know the community structure of the sea cucumber including the density, Index of diversity, dominance index, and distribution patterns. Data collection was done by using the line transect method, and sampling technique by using quadrat. The results of the study found 5 species of sea cucumber i.e. Holothuria atra,  Holothuria scabra,  Bohadschia marmorata, Actinopyga echinites, and  Bohadschia vitiensis. The individual density of all species is 0.12 ind/m2, and the diversity index (H ') 0.950. The value of the similarity index/compatibility obtained is e = 0.918. The result of the calculated dominance index of sea cucumber species is 1.0 and the pattern of spreading species of sea cucumber in the research site shows a random spread pattern because the value of dispersion index  (I) approaches 1 (one). Keywords: community; Sea cucumber; Bahoi; Dominance; Diversity.AbstrakPenelitian ini dilakukan di perairan pantai desa Bahoi, Kecamatan Likupang Barat, Kabupaten Minahasa Utara dengan tujuan untuk mengetahui jenis-jenis teripang yang ada di lokasi penelitian dan mengetahui struktur komunitas teripang yang meliputi kepadatan, indeks keanekaragaman, indeks dominasi, dan pola penyebaran. Pengambilan data dilakukan dengan metode line transek, dan teknik pengambilan sampel dengan mengunakan kuadrat. Hasil penelitian ditemukan 5 spesies teripang yaitu Holothuria atra, Holothuria scabra, Bohadschia marmorata, Actinopyga echinites dan Bohadschia vitiensis. Kepadatan individu dari seluruh spesies yaitu 0,12 ind/m2, indeks keanekaragaman (H’) 0,950. Nilai indeks kemerataan/keserasian diperoleh nilai indeks e = 0,918. nilai indeks dominasi spesies teripang diperoleh 1,0 dan pola penyebaran spesies teripang dilokasi penelitian menunjukkan pola sebaran acak (random) dikarenakan nilai indeks dispersi (I) mendekati 1 (satu).Kata Kunci : Komunitas; Teripang; Perairan Bahoi; Dominasi; Keanekaragaman

scholarly journals Drift-Ice Abrasion Marks along Rocky Shores

1985 ◽  
Vol 31 (109) ◽  
pp. 237-241 ◽  
Author(s):  
Jean-Claude Dionne
Keyword(s):  
Hudson Bay ◽  
Rocky Shores ◽  
Tidal Zone ◽  
Cold Regions ◽  
Lawrence Estuary ◽  
Soft Rocks ◽  
Rock Fragments ◽  
Ice Floes ◽  
St Lawrence Estuary ◽  
Fluvial Environments

AbstractDrift-ice abrasion marks are common along present-day rocky shorelines in cold regions. They include polished surfaces, scratches, striations, small grooves, and minor friction cracks. Most are found on relatively soft rocks like shale, sandstone, limestone, dolomite, and basalt, and occasionally on harder rocks like granite and gneiss. They were made by rock fragments frozen at the base of ice cover or by ice floes pushed onshore by wind or dragged along the bottom by waves, tides, and currents. They are found both in the modern and Pleistocene marine, lacustrine, and fluvial environments. Along the Hudson Bay eastern shoreline, these abrasion marks are superimposed on glacially polished and striated surfaces. Along the St. Lawrence Estuary, they are more common on boulders in the tidal zone. Characteristics of drift-ice abrasion marks are described and their significance is pointed out.

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