scholarly journals Autecology and the species problem in Fucus

1951 ◽  
Vol 30 (1) ◽  
pp. 161-176 ◽  
Author(s):  
Elsie M. Burrows ◽  
Sheila Lodge
Keyword(s):  
Fresh Water ◽  
Algal Flora ◽  
Rocky Shores ◽  
British Isles ◽  
Species Problem ◽  
Present Discussion ◽  
Fourth Species ◽  
Rocky Coast

On the rocky shores of the British Isles three species of Fucus are commonly found as components of the intertidal algal belt, namely, F. spiralis L., F. vesiculosus L. and F. serratus L. A fourth species, F. ceranoides L., occurs in places subject to the influence of fresh water but, although it may be important in connexion with the interacting processes to be described below, F. ceranoides is omitted from the present discussion because as yet too little is known of its autecology. Under the conditions prevailing in the characteristically zoned algal flora of an undisturbed region of a rocky coast, descriptions of the three species can be applied which fairly effectively distinguish one from the others. The chief characters used for this purpose are shown in Table I.

scholarly journals The Distribution of Gammarus Species in Estuaries. Part I

1947 ◽  
Vol 27 (1) ◽  
pp. 1-52 ◽  
Author(s):  
G. M. Spooner
Keyword(s):  
Fresh Water ◽  
Brackish Water ◽  
Field Work ◽  
Bottom Fauna ◽  
Qualitative Composition ◽  
British Isles ◽  
Free Swimming ◽  
The Status ◽  
Brackish Water Species ◽  
Water Species

The work of which an account is here given was largely carried out from the autumn of 1937 to the spring of 1940, when it was interrupted by the war. In taking it up again (in July 1945) while, facilities for field work are still limited, the author feels it useful to publish results as they stand and indicate where further work is considered advisable.In examinations of the free-swimming bottom fauna of the Tamar and other estuaries, attention was inevitably drawn to the populations of Gammarus species, which make up the greater bulk of it. Before quantitative observations were planned, some interesting points came to light with regard to the qualitative composition of populations. This aspect lent itself more readily to study and, though byno means a new field for exploration, soon proved worth examining ingreater detail than previous workers had attempted.The broad fact of a replacement of one Gammarus species by another in passing up an estuary was well enough known, though exact knowledge for the British Isles only starts from the time when G. zaddachi Sexton was recognized as a regular member of the upper estuarine fauna of the Tay (Bassindale, 1933; Alexander, Southgate & Bassindale, 1935) and of the Deben (Serventy, 1935). This species proved to be the main brackish-water species overlapping with the marine G. locusta (L.) near the seaward end, and with the fresh-water G. pulex (L.) at the river end (or ‘head’) of the estuary. The status in estuaries of two other brackish-water species, G. duebeni Lillj. and G. chevreuxi Sexton, remained obscure.

XVII.— The Ecology of Exposed Rocky Shores of Caithness

1955 ◽  
Vol 62 (3) ◽  
pp. 695-723 ◽  
Author(s):  
John R. Lewis
Keyword(s):  
Environmental Conditions ◽  
Rocky Shores ◽  
British Isles

SynopsisThe vertical and horizontal distributions of important plants and animals on exposed rocky shores in Caithness are described, and comparisons are made with other shores of the British Isles. The environmental conditions which cause a marked uplift in the zonation of inter-tidal species in Caithness are considered.

scholarly journals Contribution to the Algal Flora (Chlorophyceae) of Namchi, Sikkim-Himalayas

Our Nature ◽  
1970 ◽  
Vol 3 (1) ◽  
pp. 50-55 ◽  
Author(s):  
S. Kumar ◽  
S.K. Rai
Keyword(s):  
Key Words ◽  
Fresh Water ◽  
Green Algae ◽  
Rare Species ◽  
New Records ◽  
Algal Flora ◽  
Present Communication

The present communication is a part of survey being conducted to study the fresh water algal flora of Namchi, South Sikkim. Thirteen taxa of class Chlorophyceae, which include 8 genera, 10 species and 3 varieties, were identified from 6 samples. Spirogyra nitida (Dillw.) Link, Netrium digitus (Ehr.) Itzigs. and Roth. and Scenedesmus bijugatus (Turp.) Kuetz. were the dominant green algae followed by the remaining other rare species of Scenedesmus and Staurastrum. All these taxa constitute new records for the study area. Key words: Chlorophyceae, Fresh water algae, India, Namchi, Sikkim-Himalayadoi:10.3126/on.v3i1.334Our Nature (2005) 3: 50-55

Observation on fresh water algal flora of Sitapur district, Uttar Pradesh

2016 ◽  
Vol 1 (2) ◽  
Author(s):  
M.R. Suseela ◽  
Minhaj Akhtar Usmani ◽  
Kiran Toppo ◽  
Sanjeeva Nayaka ◽  
Sarita Sheikh
Keyword(s):  
Fresh Water ◽  
Uttar Pradesh ◽  
Algal Flora

The paper presents an account of 32 algal taxa belonging to 25 genera under four classes - Cyanophyceae, Chlorophyceae, Bacillariophyceae and Euglenophyceae.This is the first study from Sitapur district of Uttar Pradesh focusing on the enumeration of the algal flora from wetlands and ponds. The study revealed the occurrence of maximum numbers of 12 genera with 15 taxa in class Chlorophyceae while only one genus with 1 taxa was observed in class Euglenophyceae.

scholarly journals The Fresh-water Fishes of the British Isles

Nature ◽  
1912 ◽  
Vol 88 (2203) ◽  
pp. 373-374
Author(s):  
L. W. B.
Keyword(s):  
Fresh Water ◽  
British Isles

scholarly journals VII. A third essay on sea-anemonies

1777 ◽  
Vol 67 ◽  
pp. 56-84
Keyword(s):  
Fresh Water ◽  
Living Animal ◽  
Internal Organization ◽  
Fourth Species

ON THE GENERATION OF THE FOURTH SPECIES. Having in my second essay on sea-anemonies, communicated my discoveries on the manner in which the fourth species is multiplied, and offered some conjectures on the internal organization of the small shreds which become anemonies, I added a caution, not to admit of those conjectures without circumspection. What passed under my own eyes convinced me more and more (and I gave some hints to that purpose) that the smallest particle of a living animal, has an organization which far exceeds every idea we can conceive of it; and which, from the extreme minuteness of those particles, baffles our closes inspection: so that instead of being surprized at the singular effects of reproduction, they are rather what we ought to expect, and be prepared to observe as they arise. I is with this view that I have continued by experiments and observations: they have confirmed the discoveries I had made, and afforded me an opportunity to justify some eminent men, whose assertions concerning the multiplication of the fresh-water polypi by sections, have met with the most unmerited contradictions.

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