Biodiversity and the biogeographic relationships of the Amphipoda: Gammaridea on the French coastline

2004 ◽  
Vol 84 (3) ◽  
pp. 621-628 ◽  
Author(s):  
Jean-Claude Dauvin ◽  
Denise Bellan-Santini
Keyword(s):  
Latitudinal Gradient ◽  
Marine Invertebrate ◽  
English Channel ◽  
Latitude Range ◽  
The North ◽  
North Eastern ◽  
Cool Temperate ◽  
Amphipoda Species ◽  
Central Atlantic ◽  
Warm Temperate

A recent inventory of the benthic Gammaridea: Amphipoda species on the French continental coastline catalogued 495 species. An analysis of the biodiversity and the biogeographic relationships that exist between the French Amphipoda: Gammaridea, living on the coastline that extends along 10° latitude range in the temperate region between 41° and 51° North and the other gammaridean faunas living in the north-eastern Atlantic has drawn the pattern of diversity in this marine invertebrate group on a large biogeographical scale. Gammaridean amphipods exhibit a latitudinal gradient over the total number of species, including the continental shelf species and the bathyal species. There are four main fauna groups, which correspond to the biogeographical zones of the north-eastern Atlantic: (1) a cold arctic and cool-temperate Svalbard and Norwegian coastal fauna; (2) a cool-temperate boreal and Boreal–Lusitanian United Kingdom, Irish and English Channel shallow fauna; (3) a warm-temperate Lusitanian Bay of Biscay and subtropical central Atlantic fauna; and (4) a subtropical Mediterranean fauna. The French fauna appears particularly rich, presenting 44% of the 1119 species recorded in the north-eastern Atlantic along the 50° latitude range (30°N–80°N).  This is obviously due to France's intermediate latitudinal location within the Lusitanian temperate biogeographical zone, which produces a biogeographical cross between the boreal fauna in the north and the warm temperate and sub-tropical fauna in the south.

Latitude, distance offshore and local environmental features as modulators of zooplankton assemblages across the NE Atlantic Shelves Province

2018 ◽  
Vol 41 (3) ◽  
pp. 293-308
Author(s):  
Alvaro Fanjul ◽  
Arantza Iriarte ◽  
Fernando Villate ◽  
Ibon Uriarte ◽  
Miguel Artiach ◽  
...  
Keyword(s):  
Latitudinal Gradient ◽  
Single Species ◽  
English Channel ◽  
Ne Atlantic ◽  
Species Dominance ◽  
Environmental Features ◽  
Thermal Niche ◽  
The North ◽  
Niche Differences ◽  
The North Sea

Abstract Contribution of latitude, distance offshore and environmental factors to variations in zooplankton assemblages across the Northeast Atlantic Shelves Province, from the Bay of Biscay [Bilbao 35 (B35) and Urdaibai 35 (U35)] to the English Channel (Plymouth L4; L4) and the North Sea (Stonehaven; SH), were assessed mainly by redundancy analysis. For coarse zooplankton groups latitude explained the main between-site differences, and meroplankton contributed more than holoplankton. Latitudinal differences were best indicated by contrasting abundances of cirripede larvae and doliolids (most abundant at the lowest latitude sites) and bryozoan and polychaete larvae (most abundant at the highest latitude site). Doliolids were best indicators of temperature-mediated latitudinal differences. The interaction between latitude and distance offshore or salinity and phytoplankton biomass explained smaller percentages of the variability. The main differences in copepod and cladoceran genera reflected the oceanic influence, with highest presence of Corycaeus and Oncaea at L4, likely related to the higher influence of off-shelf water intrusions, and neritic Acartia dominating at SH, U35 and B35. Podon and Evadne, which decreased from south to north, reflected latitude-related differences driven more by salinity than by temperature. Instances where a single species (e.g. Acartia clausi) dominated showed common relationships with temperature, consistent with a common thermal niche. Differences in co-generic species dominance between sites depicted the latitudinal gradient.

scholarly journals A Late Permian flora of Pechora affinity in North Greenland

1982 ◽  
Vol 108 ◽  
pp. 5-13
Author(s):  
R.H Wagner ◽  
N.J Soper ◽  
A.K Higgins
Keyword(s):  
Eastern China ◽  
Late Permian ◽  
Fold Belt ◽  
The North ◽  
North Eastern ◽  
Warm Temperate ◽  
North Greenland

Late Permian plant impressions comprising six taxa have been obtained from the North Greenland fold belt. Rhipidopsis, a probable ginkgophyte, occurs together with the fems Prynadaeopteris venusta Radczenko and Pecopteris (Asterotheca?) cf. P. (A?) helenaeana Zalessky, the sphenophyte Sphenophyllum cf. S. biarnicum Zalessky the cordaitean Cordaites cf. C. sylovaensis (Neuburg) Meyen and a possibie conifer branch fragment. The assemblage invites comparison with the Pechora flora of the northem Pre-Urals, and also with that of Mongolia and north-eastern China. These may be warm temperate floras on approximately the same palaeolatitude.

scholarly journals Evidence of a relationship between weight and total length of marine fish in the North-eastern Atlantic Ocean: physiological, spatial and temporal variations

2016 ◽  
Vol 98 (3) ◽  
pp. 617-625 ◽  
Author(s):  
Kélig Mahé ◽  
Elise Bellamy ◽  
Jean Paul Delpech ◽  
Coline Lazard ◽  
Michèle Salaun ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
North Sea ◽  
Temporal Variations ◽  
Bay Of Biscay ◽  
English Channel ◽  
Total Length ◽  
The North ◽  
Eastern Atlantic Ocean ◽  
North Eastern ◽  
The North Sea

Weight–Body Length relationships (WLR) of 45 fish species (37 Actinopterygii and eight Elasmobranchii) were investigated. A total of 31,167 individuals were caught and their biological parameters measured during the four quarters from 2013 to 2015, on five scientific surveys sampling the North-eastern Atlantic Ocean from the North Sea to the Bay of Biscay (ICES Divisions IVb, IVc, VIId, VIIe, VIIg, VIIh, VIIj, VIIIa and VIIIb). Among 45 tested species, all showed a significant correlation between total length (L) and total weight (W). The influence of sex on WLR was estimated for 39 species and presented a significant sexual dimorphism for 18 species. Condition factor (K) of females was always higher than for males. Moreover, a spatial effect on the WLR according to five ecoregions (the Bay of Biscay, the Celtic Sea, the Western English Channel, the Eastern English Channel and the North Sea), was significant for 18 species among 38 tested species. The temporal effect was tested according to components (year and quarter/season). The seasonality effect on WLR is more frequently significant than the year especially for the Elasmobranchii species, and can be related to the spawning season. Finally, depressiform species (skates, sharks and flatfish) are characterized by positive allometric growth, whereas there is no such clear pattern regarding roundfishes growth, whatever their body shape is.

Preservation of a drowned gravel barrier complex: A landscape evolution study from the north-eastern English Channel

2012 ◽  
Vol 315-318 ◽  
pp. 115-131 ◽  
Author(s):  
Claire L. Mellett ◽  
David M. Hodgson ◽  
Andreas Lang ◽  
Barbara Mauz ◽  
Ian Selby ◽  
...  
Keyword(s):  
Landscape Evolution ◽  
English Channel ◽  
The North ◽  
North Eastern ◽  
Evolution Study

Systematics and biology of the Leopard-spotted Goby, Gobius ephippiatus [Teleostei: Gobiidae], with description of a new genus and notes on the identity of G. macrolepis Kolombatovic

1969 ◽  
Vol 49 (4) ◽  
pp. 831-855 ◽  
Author(s):  
P. J. Miller
Keyword(s):  
New Genus ◽  
Relative Number ◽  
Close Relative ◽  
English Channel ◽  
Body Proportions ◽  
Mediterranean Populations ◽  
Far North ◽  
The North ◽  
Meristic Counts ◽  
Warm Temperate

The leopard-spotted goby, Gobius forsteri Corbin 1958, described from the western English Channel, is identified with the Madeiran Gobius ephippiatus Lowe 1839, the latter name becoming a senior subjective synonym for this species. From study of variation, with size of fish, in number of lateral-line sensory papillae in preopercular-mandibular row i, it is concluded that the Aegean Gobius thori De Buen 1928 may also be referred to G. ephippiatus. Examination of the syntypes of G. macrolepis Kolombatovic 1891, from the Adriatic, has shown that this name belongs to a close relative of G. ephippiatus and not to Mediterranean populations of the Atlantic Lesueurigobius friesii (Malm), as recent authors have supposed. A new genus, Thorogobius, is proposed for G. ephippiatus, the type species, and G. macrolepis, and a key provided to these two species, which differ in meristic features, development of pelvic anterior membrane and disc, head coloration, and relative number of sensory papillae. Further systematic data on material studied, synonymies, body proportions, papillae and meristic counts are also given.As the complete list of known occurrences indicates, T. ephippiatus appears to be a warm temperate Mediterranean-Atlantic form which penetrates the eastern Atlantic boreal region around the British Isles at least as far north as the North Channel and eastwards to Lulworth Cove (western English Channel). As an inshore shelf species, T. ephippiatus occurs in or near crevices associated with vertical rock faces, from LWST to 30–40 m. Diet probably consists chiefly of crustaceans and polychaetes. Maximum total length recorded is 129 mm, and greatest age 9 years (determined from otoliths), with sexual maturity by the fifth year of life (age 4 +).

The distribution, relative abundance and diversity of echinoderms in the eastern English Channel, Bristol Channel, and Irish Sea

2000 ◽  
Vol 80 (1) ◽  
pp. 127-138 ◽  
Author(s):  
J.R. Ellis ◽  
S.I. Rogers
Keyword(s):  
Relative Abundance ◽  
Irish Sea ◽  
Beam Trawl ◽  
English Channel ◽  
Asterias Rubens ◽  
The North ◽  
Psammechinus Miliaris ◽  
North Eastern ◽  
Abundance And Diversity ◽  
Trawl Catches

The distribution and relative abundance of macroepibenthic echinoderms in the eastern English Channel and Irish Sea is described from beam trawl catches. Echinoderms accounted for approximately 29% (by biomass) of fauna captured. A total of 24 species were recorded, including 12 species of starfish. The most frequently encountered species were Asterias rubens and Psammechinus miliaris, which were recorded at 85.5% and 56.0% of stations respectively. Asterias rubens and Ophiothrix fragilis accounted for 63.7% and 25.5% (by biomass) respectively of the echinoderms sampled. Mean echinoderm catches ranged from 0.8-kg h−1 in the north-eastern English Channel to 329-kg h−1 in the south-eastern Irish Sea. The echinoderm fauna was more diverse in the St George's Channel and western Irish Sea (6.7–7.0 species haul−1) than in the north-eastern English Channel (1.9 species haul−1).

scholarly journals Variations in the distributions of Centropages chierchiae and Temora stylifera (Copepoda: Calanoida) in the north-eastern Atlantic Ocean and western European shelf waters

2005 ◽  
Vol 62 (5) ◽  
pp. 869-877 ◽  
Author(s):  
J.A. Lindley ◽  
S. Daykin
Keyword(s):  
North Atlantic ◽  
Seasonal Cycles ◽  
Frequency Of Occurrence ◽  
English Channel ◽  
The North ◽  
Edge Current ◽  
Eastern Atlantic Ocean ◽  
North Eastern ◽  
The North Atlantic ◽  
The North Atlantic Oscillation

Abstract Centropages chierchiae and Temora stylifera occurred rarely in the Continuous Plankton Recorder (CPR) survey in the Bay of Biscay, Celtic Sea, and English Channel before 1988. By 2000 they were found frequently and in abundance. The seasonal cycles of abundance of these species differ, C. chierchiae occurring mainly in the summer while T. stylifera was found most frequently in late autumn or winter towards the northern limits of its distribution. The increase in abundance of both species is related to temperature. However, in the years when it was found in the samples, the frequency of occurrence of C. chierchiae was correlated positively with the strength of the shelf edge current and negatively with the North Atlantic Oscillation (NAO) while the reverse was true for T. stylifera.

Balanoid barnacles from the Miocene of the Alaska Peninsula, and their relevance to the extant boreal barnacle fauna

1990 ◽  
Vol 64 (1) ◽  
pp. 128-135 ◽  
Author(s):  
Victor A. Zullo ◽  
Louie Marincovich
Keyword(s):  
North Atlantic ◽  
Alaska Peninsula ◽  
The North ◽  
Bear Lake ◽  
Lake Formation ◽  
Extant Species ◽  
Cool Temperate ◽  
Warm Temperate ◽  
The North Pacific ◽  
Arctic Fauna

The barnacle fauna of the Miocene Bear Lake Formation of the Alaska Peninsula includes Chirona (Chirona) alaskana n. sp., and three species of Balanus Da Costa conspecific with or related to the extant species Balanus balanus (Linnaeus), B. nubilus Darwin, and B. crenatus (Bruguière). Although the Bear Lake fauna lived in warm temperate waters, its modern counterparts are found primarily in boreo-arctic and cool temperate regions of the North Pacific and North Atlantic Oceans. Miocene barnacle faunas in Japan are similar to those of the Alaska Peninsula, lacking relatives of B. nubilus, but including Semibalanus Pilsbry, which does not appear until the Pleistocene in the eastern Pacific. Elements of this boreo-Arctic fauna do not appear in the North Atlantic basin until the Pleistocene, suggesting migration of the fauna into the Atlantic with the opening of the Bering Straits.

Early Mesozoic phytogeography and climate

1993 ◽  
Vol 341 (1297) ◽  
pp. 297-305 ◽  
Keyword(s):  
Global Change ◽  
Climate Changes ◽  
Latitudinal Gradient ◽  
Middle Triassic ◽  
The Other ◽  
Late Triassic ◽  
Early Mesozoic ◽  
Regional Association ◽  
Cool Temperate ◽  
Warm Temperate

Triassic and Jurassic floral lists from Eurasia have been subjected to an ordination study. A latitudinal gradient is revealed for each interval of each epoch which can be interpreted climatically as ranging through the dry subtropical to the w arm and cool temperate biomes. Floras at the dry end of the spectrum may be identified by the dominance of microphyllous conifers and the regional association with evaporites. At the other extreme, the cool temperate floras are recognized by the abundance of deciduous ginkgophytes and broadleaved conifers. The highest diversity, centered at about 40° palaeolatitude, occurs in the intermediate w arm temperate zone which may contain all of the above floral elements in association with numerous fern and cycad genera. The transitions between these biomes remained at relatively constant latitudes, from the late Triassic to the early Cretaceous, suggesting climate stasis over a long interval. Climate changes, perceived locally, appear to be the result of continental motion rather than true global change. During the early and middle Triassic, however, the biomes are less distinct, with floras interpreted as warm temperate extending to latitudes of up to 70° north.

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