scholarly journals Ecology and Distribution of Two Sympatric, Closely Related Sponge Species, Halichondria Panicea (Pallas, 1766) and H. Bowerbanki Burton, 1930 (Porifera, Demospongiae), with Remarks on their Speciation

1982 ◽  
Vol 52 (2) ◽  
pp. 82-102 ◽  
Author(s):  
A. D. Vethaak ◽  
R. J. A. Cronie ◽  
R. W. M. van Soest
Keyword(s):  
Environmental Factors ◽  
North Atlantic ◽  
Coastal Waters ◽  
Parent Species ◽  
Geographical Isolation ◽  
Ecological Segregation ◽  
European Species ◽  
Glacial Periods ◽  
Atlantic Coastal ◽  
Intertidal Level

North Atlantic coastal waters harbour two closely related sympatric sponges belonging to the genus Halichondria, viz. H. panicea and H. bowerbanki. From the study of their littoral and sublittoral microdistribution and ecology in the Oosterschelde area ( = Eastern Scheldt, S.W. part of The Netherlands) it is concluded that both occupy largely similar niches, although it was found that H. panicea is better equipped to endure exposure to air since it occurs up to a higher intertidal level than H. bowerbanki, while the latter is better equipped to withstand siltation. Other environmental factors as depth, light, current velocity and salinity affect the distribution and behaviour of both species similarly. From these observations it can be inferred, that speciation from a parent species cannot have been sympatrically through ecological segregation of individuals. The possibilities of geographical isolation of populations of a parent species on both sides of the Atlantic Ocean during past glacial periods resulting in an originally American species (H . bowerbanki) and an originally European species (H. panicea) are discussed.

scholarly journals High Rates of N 2 Fixation in Temperate, Western North Atlantic Coastal Waters Expand the Realm of Marine Diazotrophy

2019 ◽  
Vol 33 (7) ◽  
pp. 826-840 ◽  
Author(s):  
M. R. Mulholland ◽  
P. W. Bernhardt ◽  
B. N. Widner ◽  
C. R. Selden ◽  
P. D. Chappell ◽  
...  
Keyword(s):  
North Atlantic ◽  
Coastal Waters ◽  
Atlantic Coastal

scholarly journals Cyanate distribution and uptake in North Atlantic coastal waters

2017 ◽  
Vol 62 (6) ◽  
pp. 2538-2549 ◽  
Author(s):  
Brittany Widner ◽  
Margaret R. Mulholland
Keyword(s):  
North Atlantic ◽  
Coastal Waters ◽  
Atlantic Coastal

scholarly journals Annual, seasonal and spatial variation of abundance of the shrimp Artemesia longinaris (Decapoda: Penaeoidea) in south-eastern Brazil

2005 ◽  
Vol 85 (1) ◽  
pp. 107-112 ◽  
Author(s):  
Rogério C. Costa ◽  
Adilson Fransozo ◽  
Antonio L. Castilho ◽  
Fúlvio A.M. Freire
Keyword(s):  
Environmental Factors ◽  
Coastal Waters ◽  
High Salinity ◽  
Temporal Distribution ◽  
Fine Sand ◽  
Rocky Shores ◽  
Paulo State ◽  
Fishing Boat ◽  
Eastern Brazil ◽  
Atlantic Coastal

The influence of several environmental factors on the abundance and spatial–temporal distribution of the shrimp Artemesia longinaris were investigated from January 1998 to December 1999 in the Ubatuba region of São Paulo State, Brazil. Collections were performed monthly in the bays of Ubatumirim (UBM), Ubatuba (UBA) and Mar Virado (MV). Six sampling transects were established in each bay, four were parallel to the shore line, and two were next to the rocky shores. A commercial shrimp fishing boat equipped with two ‘double-rig’ nets was used. A total of 11,503 individuals was collected, including 1633 from UBM, 6344 from UBA and 3526 from MV. The majority of the captured specimens came from the deeper areas (15 to 20 m) with high salinity (34 to 36 ppt). The highest abundance of A. longinaris in Ubatuba bay was recorded in areas where fine and very fine sand comprised more than 70% of the sediment. Moreover, the abundance of A. longinaris followed a seasonal trend, being higher during the summer, when intrusions of cold South Atlantic Coastal Waters (SACW) are frequent. Thus, type of sediment, temperature and salinity are determinant factors in the distribution of A. longinaris in the studied region.

Impactor aerosol size distributions at two north Atlantic coastal sites

2000 ◽  
Vol 31 ◽  
pp. 372-373 ◽  
Author(s):  
A.G. Allen ◽  
R.M. Harrison ◽  
J.D. James ◽  
B.M. Davison ◽  
L. Robertson ◽  
...  
Keyword(s):  
North Atlantic ◽  
Size Distributions ◽  
Atlantic Coastal

scholarly journals Longitudinal zonation of larval Hydropsyche (Trichoptera: Hydropsychidae): abiotic environmental factors and biotic interactions behind the downstream sequence of Central European species

Hydrobiologia ◽  
2021 ◽  
Author(s):  
Márk Ficsór ◽  
Zoltán Csabai
Keyword(s):  
Environmental Factors ◽  
Biotic Interactions ◽  
Life Cycles ◽  
Longitudinal Distribution ◽  
Central European ◽  
European Species ◽  
Longitudinal Gradients ◽  
Species Specific ◽  
Behavioural Aspects ◽  
Abiotic Environmental Factors

AbstractThe aim of this review is to summarize the literature knowledge about how abiotic environmental factors and biotic interactions affect the sequentially overlapping longitudinal distribution of Central European species of the net-spinning freshwater caddisfly larvae of the genus Hydropsyche (Trichoptera: Hydropsychidae). In this relation, several physical and chemical parameters of water are discussed, as well as different species-specific traits, behavioural aspects and the interaction of coexisting species. Longitudinal gradients of river networks, especially annual temperature range, flow velocity and the particle size of suspended food material play a crucial role in forming the downstream succession of characteristic species, while increased levels of organic pollution, nutrients, salinity and heavy metals facilitates the presence of more tolerant ones. Several species-specific traits, such as respiration range, net-building frequency, head capsule size or optimal net-building velocity correlate with the position of a given species in the sequence. Coexistence of species with similar ecological demands in the overlapping zones of distribution is facilitated by differences in feeding and net-building habits, microhabitat preferences and staggering life cycles, but complicated at the same time by means of inter- and intraspecific territorial behaviour, such as fighting for the ownership of larval retreats or the practice of stridulation.

Temperature, Salinity and Plankton in the Eastern North Atlantic and Coastal Waters of Britain, 1957.: I. The Characterisation and Distribution of Surface Waters

1963 ◽  
Vol 20 (3) ◽  
pp. 789-826 ◽  
Author(s):  
B. McK. Bary
Keyword(s):  
North Sea ◽  
North Atlantic ◽  
Coastal Waters ◽  
Water Bodies ◽  
English Channel ◽  
Oceanic Water ◽  
Climatic Fluctuations ◽  
The North ◽  
The North Sea ◽  
Eastern North Atlantic

Monthly temperature-salinity diagrams for 1957 have demonstrated that three surface oceanic "water bodies" were consistently present in the eastern North Atlantic; two are regarded as modified North Atlantic Central water which give rise to the third by mixing. As well in the oceanic areas, large and small, high or low salinity patches of water were common. Effects of seasonal climatic fluctuations differed in the several oceanic water bodies. In coastal waters, differences in properties and in seasonal and annual cycles of the properties distinguish the waters from the North Sea, English Channel and the western entrance to the Channel.The geographic distributions of the oceanic waters are consistent with "northern" and "southern" water bodies mixing to form a "transitional" water. Within this distribution there are short-term changes in boundaries and long-term (seasonal) changes in size of the water bodies.Water in the western approaches to the English Channel appeared to be influenced chiefly by the mixed, oceanic transitional water; oceanic influences in the North Sea appear to have been from northern and transitional waters.

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