Epibiont species richness varies between holdfasts of a northern and a southerly distributed kelp species

2008 ◽  
Vol 88 (3) ◽  
pp. 469-475 ◽  
Author(s):  
A.J. Blight ◽  
R.C. Thompson
Keyword(s):  
Climate Change ◽  
Species Richness ◽  
Marine Mammals ◽  
Laminaria Digitata ◽  
Kelp Species ◽  
The North ◽  
Wide Range ◽  
North Eastern ◽  
Laminaria Ochroleuca ◽  
Northern Species

All habitats are modified to some extent by the species that live within them. Kelp is known to have a very strong influence on the surrounding environment providing a habitat for a wide range of organisms including marine mammals, fish and invertebrates. Here we examine the consequences of a subtle shift in the relative abundance of two species of kelp, Laminaria digitata and Laminaria ochroleuca, and compare the holdfast epibiont assemblages on both. These species are morphologically very similar and both provide important biologically generated habitats. The distribution of these kelp species is predicted to alter as a consequence of climate change with L. ochroleuca extending its range northward and potentially outcompeting L. digitata in the north-eastern Atlantic. The epibiont fauna common to both species of kelp were predominantly made up of annelids, molluscs and bryozoans. Most of the epibiont flora we found on the holdfasts was from the class Rhodophyceae. Multivariate analysis showed that the richness of epibiont species associated with L. ochroleuca was significantly lower, a mean of 0.62 species per cm3, when compared to the northern species, L. digitata which had a mean of 1.13 species per cm3. Laminaria digitata also had more unique epibiont species indicating that species richness of holdfast assemblages is likely to decline if L. digitata is replaced by L. ochroleuca. These data illustrate the importance of studying biologically generated habitats when considering the potential consequences of climate change on marine assemblages.

scholarly journals Effect of climate change and deforestation on vector borne diseases in the North-Eastern Indian state of Mizoram bordering Myanmar

2021 ◽  
pp. 100015
Author(s):  
Balasubramani Karuppusamy ◽  
Devojit Kumar Sarma ◽  
Pachuau Lalmalsawma ◽  
Lalfakzuala Pautu ◽  
Krishanpal Karmodiya ◽  
...  
Keyword(s):  
Climate Change ◽  
Vector Borne Diseases ◽  
The North ◽  
North Eastern ◽  
Indian State ◽  
Vector Borne

scholarly journals Late Quaternary climate change in the north-eastern highlands of Ethiopia: A high resolution 15,600 year diatom and pigment record from Lake Hayk

2018 ◽  
Vol 202 ◽  
pp. 166-181 ◽  
Author(s):  
Katie L. Loakes ◽  
David B. Ryves ◽  
Henry F. Lamb ◽  
Frank Schäbitz ◽  
Michael Dee ◽  
...  
Keyword(s):  
Climate Change ◽  
High Resolution ◽  
Late Quaternary ◽  
The North ◽  
Quaternary Climate ◽  
North Eastern ◽  
Eastern Highlands

Future projections of river floods over the European region using EURO-CORDEX simulations

2020 ◽  
Author(s):  
Fabio Di Sante ◽  
Erika Coppola ◽  
Filippo Giorgi
Keyword(s):  
Climate Change ◽  
Hydrological Cycle ◽  
Snow Accumulation ◽  
Late Winter ◽  
European Regions ◽  
Mean Flow ◽  
The North ◽  
North Eastern ◽  
River Floods ◽  
The Impact

<p>In a sick world with fever caused by global warming, the hydrological cycle will experience most certainly large changes in intensity and variability. One of the most intense phenomena that will probably be affected by the climate change is the flood hazard. For a long time the stakeholders have been dedicated resources to assess the risk linked to the floods magnitude and frequencies and shaping the public infrastructures based on the assumption of their immutability. Under the effect of the climate change this assumption can be broken and a different approach should be followed to avoid large disasters and threaten to the population health. In this study the biggest ever ensemble of hydroclimatic  simulations has been used to simulate the river floods over the European regions. A river routing model derived from a distributed hydrological model (CHyM) has been forced with 44 EURO-CORDEX, 5 CMIP5 and 7 CMIP6 simulations to assess the effects of the climate change on the floods magnitude under two different scenarios (RCP2.6 and RCP8.5 for EURO-CORDEX and CMIP5, SSP126 and SSP585 for CMIP6). The impact of the climate change has been evaluated using a 100 year return period discharge indicator (Q100) obtained fitting a Gumbel distribution on the yearly peak discharge values. Results show a decrease of magnitude of flood events over the Mediterranean, Scandinavia and the North Eastern European regions. Over these two last regions the signal appear particularly robust and in contrast to the projected mean flow signal that is shown to increase by the end of the century mainly driven by the related increase of mean precipitations. The reduction of snow accumulation during winter time linked to a large increase of late winter temperatures is the main reason behind the decrease of floods over the North Eastern regions. An opposite signal is projected  instead over Great Britain, Ireland, Northern Italy and Western Europe where a robust signal of floods magnitude increase is evident driven by e the increase of extreme precipitations. All these simulation are meant to feed the impact community and to shade the light on the use of climate information for impact assessment studies.</p>

Phylogeographic Resolution of the Barnacle (Chelonibia testudinaria) from the North-Eastern Mediterranean Loggerhead Sea Turtles Epibiont Community

2020 ◽  
Vol 5 (1) ◽  
pp. 01-08
Author(s):  
Elif Beden ◽  
Arzu Karahan
Keyword(s):  
Age Estimation ◽  
Eastern Mediterranean ◽  
Coi Gene ◽  
Loggerhead Sea Turtles ◽  
Barnacle Species ◽  
The North ◽  
Wide Range ◽  
North Eastern ◽  
Mitochondrial Cytochrome Oxidase ◽  
Magdalena Bay

Barnacles are common epibionts on a wide range of marine organisms, including turtles. Chelonibia testudinaria is a successful epibiotic barnacle species, and mainly turtles are responsible for their wide range dispersal. In the present study, the mitochondrial Cytochrome Oxidase I (COI) gene haplotypes of C. testudinaria from Caretta caretta hosts were evaluated. The samples were collected from three dead C. caretta turtle carapaces in 2014 from the Middle East Technical University, Institute of Marine Sciences coastline. Results were also compared with those samples submitted to databases (NCBI and BOLD-system, 139 in total). By comparison, three clades were recorded like previous studies: the Atlantic-Mediterranean clade (Clade-α), the IndianPacific Ocean clade (Clade-β), and Magdalena Bay (Eastern Pacific- Clade-) clade; all samples collected from Turkish shores clustered in the Atlantic-Mediterranean group (Clade-α). The gene flow between the three clades was deficient and highly significant (0.02, 0.03, and 0.03, respectively). According to network age estimation, present study samples’ clade (Clade-α) diverged from the Clade-β approximately 200 kya (SDs=0.22, SDy=4402.90) and Clade- 130 kya (SDs=0.17, SDy=3494.55). In the present study, eight haplotypes were observed in total, two of which were specific to the region.

Tracking anguillid eels: five decades of telemetry-based research

2018 ◽  
Vol 69 (2) ◽  
pp. 199 ◽  
Author(s):  
Mélanie Béguer-Pon ◽  
Julian J. Dodson ◽  
Martin Castonguay ◽  
Don Jellyman ◽  
Kim Aarestrup ◽  
...  
Keyword(s):  
Marine Mammals ◽  
Spatial Ecology ◽  
Western Europe ◽  
Migration Routes ◽  
Future Directions ◽  
The North ◽  
Spawning Areas ◽  
North Eastern ◽  
Geographical Locations ◽  
North Eastern Part

Advances in telemetry technologies have provided new opportunities to reveal the often-cryptic spatial ecology of anguillid eels. Herein we review 105 studies published between 1972 and 2016 that used a variety of telemetry technologies to study the movements of eels in a variety of habitats. Eight anguillid species have been tracked in three main geographical locations: Western Europe, the north-eastern part of North America and Australasia. Telemetry has proven to be an effective method for determining patterns of yellow eel movements in continental waters. It has also been used extensively to investigate the migratory behaviour of maturing eels as they leave fresh water to reach the sea. Among recent findings is the observation that downstream migration in continental waters is quite discontinuous, characterised by extended stopovers. Reconstructed migration routes in the open ocean obtained from satellite tags have provided indications of spawning areas, extensive vertical migrations and initial clues about the orientation mechanisms at sea. Telemetry studies have also revealed apparent evidence of predation by marine mammals and fish at sea, suggesting a significant natural source of mortality during the eel spawning migration. Finally, we discuss some limitations of telemetry technology and future directions, as well as associated challenges, to the developing field of eel spatial ecology.

A Review of Institutional and Developmental Issues in North-East India

2020 ◽  
Vol 66 (2) ◽  
pp. 206-218
Author(s):  
Nicodim Basumatary ◽  
Bhagirathi Panda
Keyword(s):  
Rule Of Law ◽  
Institutional Factors ◽  
Eastern Region ◽  
Political Issues ◽  
Developmental Issues ◽  
North East India ◽  
North East ◽  
The North ◽  
Wide Range ◽  
North Eastern

Developmental issues of the North-Eastern States of India cannot be studied inisolation without accounting for the varied politico-socio-economic and institutional factors. This study covers a wide range of the socio-political issues and developmental gaps in the North-Eastern Region (NER) of India. It presents a broader picture and gives an understanding of the issues of governance and development prevailing in this region. Many issues pertain to paucity of developmental outcomes, ethnicity, demand for statehood, insurgency, absence of rule of law, corruption and so on, suggesting state’s ineffectiveness and people’s incompetence to take development to the front stage. An effort has also been made to trace the literature that deals with these issues.

How many heteropteran species can live on alien goldenrods Solidago canadensis and S. gigantea in Europe?

Biologia ◽  
2009 ◽  
Vol 64 (5) ◽  
Author(s):  
Magdaléna Roháčová ◽  
Pavel Drozd
Keyword(s):  
Species Richness ◽  
Czech Republic ◽  
Small Proportion ◽  
Trophic Structure ◽  
Solidago Canadensis ◽  
The Czech Republic ◽  
The North ◽  
North Eastern ◽  
Plant Stand ◽  
North Eastern Part

AbstractDuring the vegetation periods of 2001–2003 Heteroptera associated with the invasive alien tall goldenrods Solidago canadensis and S. gigantea were studied in seven model habitats in the north-eastern part of the Czech Republic. Heteropterans associated with adjacent growths were also studied in 2002–2003. A set of 3,042 specimens of 127 samples was analyzed with the aim of estimating average species richness, abundance and trophic structure of the heteropteran assemblages of the studied plant stand. On alien Solidago, 68 heteropteran species were recorded and 71 species were collected in the stands adjacent to the tall goldenrods with 48 shared species. Despite the nearly indentical species richness and similar abundances in Solidago and adjacent stands, there are differences in the trophic structure. The majority of the shared species and species found on Solidago canadensis only are polyphagous contrary to the majority of stenophagous species found on Solidago free stands only. Only a small proportion of heteropteran species that were recorded on alien Solidago stands are specialized to Asteraceae and their abundance was mostly low. Only the lygaeid Nysius senecionis, an Asteraceae specialist, occured in masses on S. canadensis in sunny and warm habitats. Similarly, predatory Orius minutus and O. niger reached high abundance values in Solidago stands compared to adjacent stands.

CO2 generation by calcified invertebrates along rocky shores of Brittany, France

2013 ◽  
Vol 64 (2) ◽  
pp. 91 ◽  
Author(s):  
Christian Hily ◽  
Jacques Grall ◽  
Laurent Chauvaud ◽  
Morgane Lejart ◽  
Jacques Clavier
Keyword(s):  
Intertidal Zone ◽  
Rocky Shore ◽  
Regional Scale ◽  
Coastal Environment ◽  
Co2 Production ◽  
Rocky Shores ◽  
Atlantic Region ◽  
The North ◽  
Wide Range ◽  
North Eastern

Many autochthonous and alien macroinvertebrates of the intertidal zone are biocalcifiers, and the present study proposes a first assessment of their calcimass and their annual calcium carbonate (CaCO3) production at a regional scale, along 500 km of the coastline of Brittany, France, which represents a wide range of the rocky-shore habitats commonly encountered in the north-eastern Atlantic region. All sites considered together gave a mean calcimass estimate of 5327 g m–2. The corresponding mean CaCO3 gross production was 2584 g m–2 year–1. The net production (including dissolution) by biocalcification was 2384 g CaCO3 m–2 year–1. Estimations of CO2 production via both calcification and respiration were carried out in particular for the phylum Mollusca and for crustacean barnacles, dominating in terms of calcimass. Mean CO2 production obtained by summing CO2 fluxes related to net CaCO3 production and respiration for all sampled sites was 22.9 mol m–2 year–1. These results illustrate the significance of CO2 production during biogenic CaCO3 precipitation of intertidal invertebrates in such temperate coastal environment compared with tropical zones and the contribution of the shelves to the global CaCO3 budget.

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