﻿Nichols: 
  The 
  vegetation 
  of 
  Connecticut 
  95 
  

  

  400 
  feet. 
  B. 
  M. 
  Davis 
  ('13) 
  mentions 
  twelve 
  red 
  algae 
  and 
  two 
  

   browns 
  which, 
  in 
  the 
  vicinity 
  of 
  Woods 
  Hole, 
  Massachusetts, 
  

   have 
  been 
  found 
  growing 
  in 
  water 
  from 
  100 
  to 
  115 
  feet 
  in 
  depth. 
  

   No 
  data 
  are 
  available 
  for 
  Long 
  Island 
  Sound. 
  

  

  Temperature 
  of 
  sea 
  water, 
  — 
  Differences 
  also 
  in 
  the 
  temperature 
  

   of 
  the 
  water 
  unquestionably 
  play 
  an 
  important 
  part 
  in 
  determining 
  

   the 
  distribution 
  of 
  various 
  marine 
  algae, 
  especially 
  of 
  forms 
  that 
  

   grow 
  below 
  low 
  tide 
  level, 
  and 
  the 
  character 
  of 
  various 
  associations 
  

   of 
  seaweeds 
  may 
  thereby 
  be 
  influenced 
  to 
  a 
  marked 
  degree. 
  

   Thus, 
  the 
  dissimilarities 
  between 
  the 
  algal 
  vegetation 
  of 
  sheltered 
  

   waters 
  and 
  that 
  of 
  more 
  exposed 
  waters 
  seem 
  to 
  be 
  associated 
  in 
  

  

  r 
  

  

  large 
  measure 
  with 
  differences 
  in 
  temperature. 
  Sheltered 
  waters 
  

   are 
  warmer 
  in 
  summer 
  and 
  may 
  be 
  colder 
  in 
  winter 
  than 
  are 
  

   exposed 
  waters; 
  they 
  exhibit 
  a 
  much 
  higher 
  range 
  of 
  temperatures 
  

   from 
  season 
  to 
  season. 
  B. 
  M. 
  Davis 
  regards 
  the 
  temperature 
  

   factor 
  as 
  of 
  such 
  fundamental 
  significance 
  that 
  in 
  classifying 
  the 
  

   sublittoral 
  associations 
  of 
  the 
  Woods 
  Hole 
  region 
  he 
  divides 
  

   them 
  primarily 
  into 
  two 
  groups: 
  the 
  cool 
  water 
  sublittoral 
  forma- 
  

   tion 
  and 
  the 
  warm 
  water 
  sublittoral 
  formation. 
  The 
  former 
  

   embraces 
  the 
  associations 
  of 
  areas 
  in 
  which 
  the 
  temperature 
  at 
  

   the 
  bottom 
  Is 
  relatively 
  cool 
  during 
  the 
  summer 
  months, 
  particu- 
  

   larly 
  of 
  situations 
  which 
  are 
  exposed 
  to 
  the 
  open 
  sea. 
  The 
  latter 
  

   embraces 
  the 
  associations 
  of 
  areas 
  in 
  which 
  the 
  temperature 
  at 
  

   the 
  bottom 
  is 
  relatively 
  warm 
  during 
  .the 
  summer 
  months, 
  particu- 
  

   larly 
  of 
  situations 
  which 
  are 
  sheltered 
  from 
  the 
  open 
  sea. 
  Many 
  

   of 
  the 
  seaweeds 
  which 
  are 
  found 
  only 
  during 
  winter 
  and 
  spring 
  

   in 
  the 
  more 
  sheltered 
  situations 
  flourish 
  throughout 
  the 
  year 
  in 
  

   more 
  exposed 
  waters. 
  The 
  influence 
  of 
  differences 
  in 
  the 
  tempera- 
  

   ture 
  of 
  the 
  water 
  is 
  further 
  seen 
  in 
  the 
  pronounced 
  seasonal 
  

   periodicity 
  exhibited 
  by 
  many 
  algae. 
  Thus, 
  some 
  species 
  which 
  

   are 
  very 
  conspicuous 
  during 
  winter 
  and 
  spring 
  seem 
  to 
  disappear 
  

   completely 
  during 
  the 
  summer, 
  while 
  others, 
  which 
  are 
  prominent 
  

   in 
  summer, 
  are 
  apparently 
  absent 
  in 
  winter. 
  

  

  B. 
  Physiogr.^.phic 
  influences 
  

   Erosion 
  and 
  deposiMmi.—Nowhere 
  is 
  the 
  influence 
  of 
  erosion 
  

   and 
  deposition 
  on 
  the 
  character 
  of 
  the 
  vegetation 
  more 
  apparent 
  

   than 
  along 
  the 
  seacoast. 
  Here, 
  as 
  elsewhere, 
  dynamic 
  forces 
  of 
  

  

  