Gastropod communities associated with different morphologies of the intertidal seaweed Hormosira banksii

2019 ◽  
Vol 70 (2) ◽  
pp. 280 ◽  
Author(s):  
F. Gemelli ◽  
C. R. Johnson ◽  
J. T. Wright
Keyword(s):  
Morphological Traits ◽  
Specific Effect ◽  
Distribution Patterns ◽  
North Coast ◽  
Physical Conditions ◽  
The North ◽  
Intertidal Seaweed ◽  
Abundance And Diversity ◽  
The Relationship ◽  
Thallus Length

Hormosira banksii is an important intertidal habitat-forming seaweed in southern Australia that shows large variation in morphology. We examined the relationship between morphological variation in Hormosira and associated gastropod community structure, abundance and diversity in Tasmania, southern Australia. We sampled both Hormosira and gastropods from sites in two habitats (coast and estuary), two times (February–March and October–November) at two regions (northern and eastern Tasmania). There were distinct Hormosira morphs on the north coast (small individuals), east coast (intermediate sized individuals) and in estuaries (large individuals). Multivariate analysis showed that gastropod communities varied among the different algal morphologies, and suggest an influence of morphological traits, specifically thallus length, vesicle number and size, on the distribution patterns of gastropod species. Despite the finding of distinct gastropod communities associated with the different Hormosira morphs, because the different morphs occur in different locations with different physical conditions, we cannot unequivocally attribute the differences in gastropod communities to seaweed morphology per se. Nonetheless, our results confirm that H. banksii is an important foundation species in the intertidal zone and suggest a habitat-specific effect of algal morphological traits on gastropods.

Artificial reef influence on the surrounding infauna—north coast of Rio de Janeiro State, Brazil

2011 ◽  
Vol 92 (6) ◽  
pp. 1289-1299 ◽  
Author(s):  
Ilana Rosental Zalmon ◽  
Catarina Dalvi Boina ◽  
T.C.M. Almeida
Keyword(s):  
Rio De Janeiro ◽  
Artificial Reef ◽  
Artificial Reefs ◽  
North Coast ◽  
Taxon Richness ◽  
Benthic Assemblages ◽  
The North ◽  
Eastern Brazil ◽  
Macrobenthic Assemblages ◽  
The Relationship

There have been many efforts to appraise the extent to which artificial reefs affect the surrounding community, but few studies addressed whether benthic assemblages change with distance from the reef. We experimentally assessed the relationship between infauna abundance and richness with increased distance (0, 5, 25, 50, 100 and 300 m) from reefballs deployed on a flat and homogeneous bottom, 9-m deep, on the north coast of Rio de Janeiro, south-eastern Brazil. Benthic taxon richness and abundance varied significantly between surveys with higher values in February 2007. Both numerical indicators changed similarly with distance, but more noticeably between 300 m and the other distance treatments where abundance was highest. A non-metric multidimensional scaling ordination revealed that macrobenthic assemblages were very heterogeneous with significant differences between surveys but not among sampling distances. A canonical correspondence analysis including species, distances and sediment variables showed that the distances 5, 25 and 100 m were related to organic matter and mud (fine sediment), while 0 and 300 m distances were more related to the non-organic variables, such as the percentage of gravel, sand and calcium carbonate. Spatial variations in the parameters of the sediment alone did not explain the distribution of the associated infauna, given the similarity of the community at different distances. It is suggested that the influence of artificial reefs is quickly dissipated due to strong bottom sea currents, indicating a reduced impact or influence of these reefs on the surrounding infauna.

Cosmarium bahianum, sp. nov. (Desmidiaceae), a new desmid species from a phytotelm habitat in the Brazilian restinga

Phytotaxa ◽  
2017 ◽  
Vol 291 (1) ◽  
pp. 66 ◽  
Author(s):  
GERALDO JOSÉ PEIXOTO RAMOS ◽  
CARLOS EDUARDO DE MATTOS BICUDO ◽  
CARLOS WALLACE DO NASCIMENTO MOURA
Keyword(s):  
New Species ◽  
North Coast ◽  
Similar Species ◽  
Northeast Brazil ◽  
The North ◽  
Apical View ◽  
Relationship Of ◽  
The Relationship

Cosmarium bahianum sp. nov. is described from samples collected from a bromeliad tank (phytotelmata) in a “restinga” area located at Salvador, Bahia State, northeast Brazil. Cosmarium bahianum belongs to the group of placoderm desmids, and is mainly characterized by rather small, smooth-walled, but remarkably punctate cells that are elliptic to subtriangular in apical view, as well as by a globose to elliptical, smooth-walled zygospore. The new species was collected from Hohenbergia littoralis J.B.Smith, an endangered endemic bromeliad species from the Brazilian Restinga with distribution restricted to the north coast of Bahia. The relationship of C. bahianum with morphologically similar species is discussed.

scholarly journals Diversity and Distribution Patterns of Hard Bottom Polychaete Assemblages in the North Adriatic Sea (Mediterranean)

Diversity ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 408
Author(s):  
Barbara Mikac ◽  
Margherita Licciano ◽  
Andrej Jaklin ◽  
Ljiljana Iveša ◽  
Adriana Giangrande ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
Benthic Communities ◽  
Structural Similarity ◽  
Distribution Patterns ◽  
Northern Adriatic Sea ◽  
Environmental Pressures ◽  
Northern Adriatic ◽  
The North ◽  
The Family ◽  
Abundance And Diversity

The knowledge on the hard bottom polychaete assemblages in the Northern Adriatic Sea, a Mediterranean region strongly affected by environmental pressures, is scarce and outdated. The objective of this paper was to update the information on polychaete diversity and depict their patterns of natural spatial variation, in relation to changes in algal coverage at increasing depth. Hard bottom benthos was quantitatively sampled by scraping off the substrate from three stations at Sveti Ivan Island (North Adriatic) at three depths (1.5 m, 5 m and 25 m). Polychaete fauna comprised 107 taxa (the majority of them identified at species level) belonging to 22 families, with the family Syllidae ranking first in terms of number of species, followed by Sabellidae, Nereididae, Eunicidae and Serpulidae. Considering the number of polychaete species and their identity, the present data differed considerably from previous studies carried out in the area. Two alien species, Lepidonotus tenuisetosus, which represented a new record for the Adriatic Sea, and Nereis persica, were recorded. The highest mean abundance, species diversity and internal structural similarity of polychaete assemblages were found at 5 m depth, characterised by complex and heterogeneous algal habitat. The DISTLM forward analysis revealed that the distribution of several algal taxa as well as some algal functional-morphological groups significantly explained the observed distribution patterns of abundance and diversity of polychaete assemblages. The diversity of the North Adriatic hard bottom polychaete fauna is largely underestimated and needs regular updating in order to detect and monitor changes of benthic communities in the area.

Nereididae (Annelida: Polychaeta) from intertidal habitats in the Gulf of Oman, Iran

Zootaxa ◽  
2011 ◽  
Vol 3013 (1) ◽  
pp. 48 ◽  
Author(s):  
SHETAV YOUSEFI ◽  
HASAN RAHIMIAN ◽  
SEID MOHAMMAD BAGHER NABAVI ◽  
CHRISTOPHER GLASBY
Keyword(s):  
Arabian Gulf ◽  
Distribution Patterns ◽  
North Coast ◽  
Gulf Region ◽  
Gulf Of Oman ◽  
The North ◽  
The Family ◽  
Iranian Coast ◽  
Intertidal Habitats ◽  
Species Composition And Distribution

The species composition and distribution patterns of Nereididae (Annelida: Polychaeta) from the north coast of Gulf of Oman were investigated. Specimens were collected from ten intertidal sites along the Iranian coast, including mangrove, muddy, boulder and rocky, coral and sandy-rocky shore habitats. Eight species of Nereididae were identified: Leonnates decipiens Fauvel, Nereis coutieri Gravier, Neanthes deplanata Mohammad, Perinereis nuntia (Savigny), Perinereis heterodonta Gravier, Perinereis cultrifera (Grube), Perinereis horsti Gravier and Pseudonereis trimaculata Horst. The eight species are redescribed and two Perinereis species, P. heterodonta and P. horsti, currently junior synonyms of P. nuntia and P. vancaurica (Ehlers) respectively, are raised from synonymy. All reported species are new records for the Gulf of Oman, bringing the known total number of species in the family to twelve; P. trimaculata is also a new record for the Arabian Sea–Arabian Gulf region. Nereidid diversity within the region is comparable to other Indo-Pacific coastal regions, and higher than other parts of the world.

scholarly journals From food to offspring: engagement between humans and sea turtles in two communities on the north coast of Espírito Santo

2020 ◽  
Vol 17 ◽  
Author(s):  
Davi Scárdua Fontinelli ◽  
Eliana Santos Junqueira Creado
Keyword(s):  
Sea Turtles ◽  
North Coast ◽  
Environmental Conflicts ◽  
Espírito Santo ◽  
The North ◽  
Environmental Agents ◽  
Conservation Projects ◽  
Espirito Santo ◽  
Political Economic ◽  
The Relationship

Abstract This article is the result of a research conducted in the villages of Regência Augusta and Povoação, in the State of Espírito Santo, Brazil. The objective is to contribute to knowledge concerning biodiversity conservation projects and the relationships between these, local communities and emblematic species in the midst of socio-environmental conflicts. We intend to highlight some of the ways that human agents interact with each other through the relationship with other non-human agents, developing conceptions and actions in and with the world around them. The empirical analysis addresses the case of sea turtles and the environmental agents who deal with them. Those who patrol the beach are prominent in this text, but we will also consider the way in which these works form an ambiguous relationship with other knowledges and practices. The region is going through political, economic and environmental divergences related to resources and the local landscape, aggravated by the arrival of Samarco’s mud.

scholarly journals Sponge distribution and the presence of photosymbionts in Moorea, French Polynesia

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e1816 ◽  
Author(s):  
Christopher J. Freeman ◽  
Cole G. Easson
Keyword(s):  
Growth Form ◽  
French Polynesia ◽  
North Coast ◽  
The North ◽  
Putative Species ◽  
Cryptic Habitats ◽  
Host Ecology ◽  
Initial Support ◽  
Abundance And Diversity

Photosymbionts play an important role in the ecology and evolution of diverse host species within the marine environment. Although sponge-photosymbiont interactions have been well described from geographically disparate sites worldwide, our understanding of these interactions from shallow water systems within French Polynesia is limited. We surveyed diverse habitats around the north coast of Moorea, French Polynesia and screened sponges for the presence of photosymbionts. Overall sponge abundance and diversity were low, with <1% cover and only eight putative species identified by 28S barcoding from surveys at 21 sites. Of these eight species, seven were found predominately in shaded or semi-cryptic habitats under overhangs or within caverns.Lendenfeldia chondrodeswas the only species that supported a high abundance of photosymbionts and was also the only species found in exposed, illuminated habitats. Interestingly,L. chondrodeswas found at three distinct sites, with a massive, fan-shaped growth form at two of the lagoon sites and a thin, encrusting growth form within a bay site. These two growth forms differed in their photosymbiont abundance, with massive individuals ofL. chondrodeshaving higher photosymbiont abundance than encrusting individuals from the bay. We present evidence that some sponges from French Polynesia support abundant photosymbiont communities and provide initial support for the role of these communities in host ecology.

scholarly journals EDUCATION LEVEL IN THE RELATION TO ADOLESCENTS PREGNANCY IN INDRAMAYU 2019

2020 ◽  
Vol 1 (1) ◽  
pp. 23
Author(s):  
Rudiansyah Rudiansyah ◽  
Dartiwen Dartiwen
Keyword(s):  
Pregnant Women ◽  
Education Level ◽  
North Coast ◽  
P Value ◽  
Cross Sectional ◽  
The North ◽  
The Subject ◽  
Analytic Design ◽  
Relationship Of ◽  
The Relationship

Adolescents’ pregnancy negatively impacts their health and their babies, also gives socio-economics impacts and risks of premature birth, low birth weight (LBW) and bleeding that can increase maternal and infant mortality. This study aims to determine the relationship of education level with the pregnancy at the age of adolescence. This research using observational analytic design with cross-sectional to recognize the relationship between education level ties and pregnancy at the age of adolescence. The subject of this research is pregnant women in the North Coast Region of Indramayu who meet the inclusion criteria and are willing to sign the consent form after being given an explanation. The samples of 200 pregnant women were taken using consecutive sampling. The results obtained p-value = 0.045 smaller than the alpha value (<0. 05) it can be concluded that there is a relationship between the level of education of mothers with pregnancy in adolescence. Analysis we found the value of OR of 3.336 (95% CI 1.098 to 10.140) means, less educated mother 3.336 times risk higher to get married and pregnant at the age of adolescence. It is expected that health center, government worker and the Office of Religious Affairs (KUA) able to work together to provide better education for adolescents and prospective brides in order not to get pregnant at an early age.

scholarly journals Assessment of Longitudinal Gradients in Nematode Communities in the Deep Northern Gulf of Mexico and Concordance with Benthic Taxa

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Jyotsna Sharma ◽  
Jeffrey G. Baguley ◽  
Paul A. Montagna ◽  
Gilbert T. Rowe
Keyword(s):  
Gulf Of Mexico ◽  
Mississippi River ◽  
Distribution Patterns ◽  
Nematode Communities ◽  
Northern Gulf Of Mexico ◽  
The North ◽  
Longitudinal Gradients ◽  
Harpacticoid Copepods ◽  
Significant Difference ◽  
Abundance And Diversity

Meiobenthic nematode assemblages were examined at 16 stations along two transects on the eastern and western boundaries of the deep northern Gulf of Mexico (dNGOM) at depths of 212–3000 m. The highest abundance (297 individuals 10 cm−2) and number of genera (71) occurred at stations near the Mississippi River delta. Number of genera decreased with increasing depth, and showed differences in community composition between the east and west regions. The dominant family, Comesomatidae, was represented by Sabatieria that was present at most shallow stations but absent at greater water depths. A significant difference in nematode feeding morphology was observed between depth groups but not between the two transects at different longitudes. Patterns of nematode community structure are congruent with harpacticoid copepods. Overall, the higher abundance and diversity of nematodes in the north-central Gulf of Mexico is consistent with findings of other benthic taxa and reflects organic material loading from the Mississippi River driving deep sea communities in the Gulf. The east-west gradient in composition of nematode communities suggests that nematode assemblages have well-defined distribution patterns similar to other meiobenthic taxa in the GOM but they are not aligned in the bathymetric zones observed in macrofauna, megafauna and demersal fishes.

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