Brachyuran crab diversity and abundance patterns in the mangroves of Cameroon

Accepted Manuscript Brachyuran crab diversity and abundance patterns in the mangroves of Cameroon Vanessa Maxemilie Ngo-Massou, Ndongo Din, Martin Kenne, Alain Bertrand Dongmo

PII: DOI: Reference:

S2352-4855(17)30348-1 https://doi.org/10.1016/j.rsma.2018.09.010 RSMA 429

To appear in:

Regional Studies in Marine Science

Received date : 30 January 2018 Revised date : 11 September 2018 Accepted date : 22 September 2018 Please cite this article as: Ngo-Massou V.M., et al., Brachyuran crab diversity and abundance patterns in the mangroves of Cameroon. Regional Studies in Marine Science (2018), https://doi.org/10.1016/j.rsma.2018.09.010 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Brachyuran crab diversity and abundance patterns in the mangroves of Cameroon
Vanessa Maxemilie Ngo-Massou1.2*,Ndongo Din1,Martin Kenne3, Alain Bertrand Dongmo3


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Table 1 /7*30/.&/5"-
7"3*"5*0/4
#&58&&/
3&(*0/4
"/%
$*5*&4

D
1&3$&/5"(&
0'
."/(307&
%&(3"%"5*0/
Zones

Cities

Stations harvested

Number of plant species

7*0/
#&"$)
*,0



110-0
#&"$)


035)


08/
#&"$)

*.#&



*-&
4*9
#&"$)
4

Sub-total / Mean

6

0*4
%&
4*/(&
0/".06"/(
06"-"


0/"("/(
0/<80/%"





44&/(6&


&/5&3


0/5
%6
8063*
!0:0

06"/,0


!0:0






#*",0
9

Sub-total / Mean

/ &3*63#"/
."/(307&4
"/(307&4
0'
44&/(6&
0/5
%6
063*
"/%
0*4
%&
4*/(&
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50
#&$0.&
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63#"/*;"5*0/
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4"/%
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"3&
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#&$"64&
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130.05&4
5)&
$0.1-&5&
$655*/(
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%&&1
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"$,
."/(307&
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3&(6-"3-:
%&4530:&%
'03
$3014
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40.&
4*5&4
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50
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7&3"--
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411
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/

4

9

17

18

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$0/4536$5*0/
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3*#*


Total / Mean

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"%7"/$&.&/5
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$0/53*#65*/(
50
5)&
%&$-*/&
*/
."/(307&
$07&3
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363"-
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5",*/(
1-"$&
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5)&
$0"45"-
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13

1"--"


Sub-total / Mean

Overall state of sites







72.2







69

67.9

Total







































No.






$1 0,(# $


.023-(# $


 -./$(# $


"7/.#(# $

 )(# $


0 /1(# $

$" 0"(-(# $

Families

/$"($1

/$"($1
 /$"($1



*Sesarma 1/
*Sesarma 1/
*Sesarma 1/


Guinearma kamermani $
 -
 Metagrapsus curvatus 
(+-$
#5 0#1



Guinearma huzardi $1, 0$12



Cardisoma armatum $0*+.21

C. guanhumi  20$(++$

Goniopsis pelii $0*+.21
 *Goniopsis cruentata 
(+-$#5 0#1

Grapsus grapsus (-- $31
  Pachygrapsus gracilis (!!$1

Pachygrapsus transversus (!!$1

*Maja squinado $0!12
 
Afruca tangeri 7#.36
 
Ocypode africana $
 -
 *Ocypode cursor (-- $31
 
Panopeus africanus 
(+-$#5 0#1

Callinectes pallidus ."'$!03-$

Portunus validus $0*+.21

Armases elegans $0*+.21
 Chiromantes angolense 0(2.
 /$++.

Chiromantes buettikoferi $
 -

Guinearma alberti $0*+.21



Species











100 /

418 11

 















North A %






 











 




















 
 
 









5107 20









































/

100

 












Center A %









































 





Zones


































Table 2 .,/.1(2(.-
!3-# -"$
-#
,("0.' !(2 21
.%
' 04$12$#
"0 !1

-3,!$0
.%
(-#(4(#3 +1

/$0"$-2 &$
.%
(-#(4(#3 +1; *0$13,$#
&$-31
.0
1/$"($1












1145 18






6"+31(4$+7
.-
203-*1
-#
!0 -"'
20$$1
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130% "$
3-#$0
#$ #
5..#1
-#
#$20(231
!300.51
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Raphia
+(22$0
(-
+$ %
6(+1
.%
Pandanus


30% "$
-$ 0
2.
,$ -
"' --$+
.0
5 2$0


3##7
130% "$
3-#$0
#$ #
5..#
.0
#$20(231


6"+31(4$+7
.-
1 -#7
!$ "'$1
(-
130% "$
.0
(-
#$$/+7
!300.51


 -#7
.0
,3##7
130% "$
-#
#.-82
1/$-2

,3"'
2(,$
(-1(#$
2'$(0
!300.51
#30(-&
# 7
2(,$
$25$$-
0."*1
.0
/$!!+$1
."*7
0$ 1
300.51
(-
2'$
,3#%+ 2
.0
1 -#7
0$
 -#7
130% "$
-$ 0
2.
5 2$0
3##7
.0
1 -#7
130% "$
-#
!300.51
(-
./$-
0$ 1
-#
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$$/+7
!300.51
".,,.-+7
(-
2'$
! "*
, -&0.4$
-$ 0
2.
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Microhabitats

30% "$
3-#$0
#$ #
5..#1
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#.-82
1/$-2
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2(,$
(-1(#$

2'$(0
!300.51
#30(-&
# 7
2(,$




3##7
130% "$



30% "$
3-#$0
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5..#1
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+(22$0


 -#7
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130% "$


 -#7
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,3##7
130% "$


$$/+7
!300.51
".,,.-+7
(-
+ -#
0$ 1

100

/

South A % 



 
 






































Table 3
%'$ !&%
"
&
%# !%
$#"$&
"$
&
$%&
& 
$"
&
!$"(%
"
 $""!

'!!
"
%#%




Measurements (cm) Species

A

Cardisoma guanhumi Goniopsis cruentata Maja squinado Ocypode cursor Pachygrapsus gracilis #%
 #%
 #%



Families






















$!
$#%

)#"
$#%





%$ 


































Sesarma %##



Lengh

        
 
 
 
 



Width 


 
   
 






 
 






Table 4 #/2.+0)
'((135
2'3
;10'4
#0&
2'3
45#5+104
n 
15#.
06/$'3
1(
+0&+7+&6#.4
%1..'%5'&
Sobs

$4'37'&
42'%+'4
3+%*0'44
S? Jackknife

36'
3+%*0'44
1$5#+0'&
64+0)
5*'
(+34513&'3
#%--0+('
'45+/#513
SD
45#0&
&'7+#5+10
1(
#%--0+('
'45+/#513

H’
*#0010>4
&+7'34+5:
+0&'9

4#/2.+0)
'((135

Zones

North

Center

South

Total/Mean

Stations

n

7+10
$'#%*
221.1
$'#%*
180
$'#%*
+.'
4+9
$'#%*
Sub-total/Mean 1+4
&'
+0)'

10#/160)
10#)#0)
10810&#
44'0)6<
163+
3+&)'

$+#-1
!1:1


!1:1
Sub-total/Mean 2#..#
;+16
10&,+


10&,+


Sub-total/Mean









418 
















5107 





1122 6670

Sobs 



11 












20











18 27

S? jackknife ± SD


=



=



=
 
=
 12.5±0.9 
=
 
=
 
=
 
=



=
 
=
 
=


=



=
 26.2±2.2


=



=



=
 
=
 19.8±0.8 32.3±3.5

H’

E






 



3.1±0.2  







 


 







3.3±0.1 



3.3±0.2 3.6±0.1

     80.0

    



         91.7       85.5 87.5

Table 5a
%'
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N
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S
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d
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Zones

N







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Center







South




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6670

Shannon-Weaver index





































 

















0.005

4.6

0.0004

24.9

0.3

0.8

H/  -SD


H/  "#


H/  "+


H’var




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-







 





-

27

0.004

0.1

3.6±0.1

Table 5b  !

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Table 6 '%"&&
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Hill number

nmax

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N2

















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4.2

6176




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Global

6670



15.0

11.0

E

BergerDominant Parker species index ID 

n S

0.8

1580

0.2

13

Rare species

Richness Estimators

n

S
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0





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 0





 0


0

30.2±4.4

32.3±3.5

14

0.211

27

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269.40






 




 


<0.001

3.279



 










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2.854

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Geometric model Logarithmic series Lognormal distribution Zones 










Log () 








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k

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*


Table 7

Caption legends

 
 



Fig. 1. Map showing the location of the sampling stations (in red) in Cameroon coast (Modified from Din et al., 2014).

1



































































Fig. 2. Some crabs harvested from mangroves of Cameroon. a, Armases elegans; b, Cardisoma armatum; c, Panopeus africanus; d, Metagrapsus curvatus; e, Guinearma alberti; f, Guinearma kamermani; g, Grapsus grapsus; h, Ocypode africana; i, Ocypode cursor; j, Goniopsis pelii; k, Species 1; l, Pachygrapsus gracilis; m, Portunus (sanguerus) valid; n, Chiromantes angolense.





2

%

30 25 20 15 10 5 0

A




30

%

25 20

B


15 10 5

%

%

0

30 25 20 15 10 5 0

30 25 20 15 10 5 0




C




D

Fig. 3 Rank-frequency diagrams of relative crabs species abundances collected from 17 stations in the Cameroon mangroves. Percentages are calculated on the total number of individuals collected. A, Global settlement; B, North zone; C, Center zone; D, South zone.



3




200

B

100 20

50

Abundance

200

200 100 50 5

5

10

10

20

Abundance

Null Preemption Lognormal Zipf Mandelbrot

500

500 1000

Null Preemption Lognormal Zipf Mandelbrot

A

5

10

15

20

5

10

25

Abundance

20

100 50

2

5

10

5

20

Null Preemption Lognormal Zipf Mandelbrot

D

50

Null Preemption Lognormal Zipf Mandelbrot

C

10

200

20

Rank

Rank

Abundance

15

5

10 Rank

15

2

4

6

8

10

Rank

Fig. 4. Species abundance patterns adjusted. The best model is geometric series in the 3 regions. A= Global settlement; B = North zone; C = Center zone; D = South zone; Null –MacArthur model; Preemption – geometric series of Motomura; Lognormal –Lognormal distribution of Preston; Zipf –Zipf Model; Mandelbrot – Zipf-Mandelbrot Model.

4