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2017 ; 4
(1
): 160621
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Territorial battles between fiddler crab species
#MMPMID28280560
Clark HL
; Backwell PR
R Soc Open Sci
2017[Jan]; 4
(1
): 160621
PMID28280560
show ga
Many species worldwide are impacted by habitat loss. This may result in increased
competition both within species and between species. Many studies have
demonstrated that when two previously non-overlapping species are forced to
compete over a resource, one species is likely to become dominant over the other.
This study explores the impact a larger species of fiddler crab (Tabuca
elegans-previously known as Uca elegans) has when invading an area previously
used solely by a smaller species (Austruca mjoebergi-previously known as Uca
mjoebergi). Here we show that, while there are some detrimental effects of living
next to a heterospecific, they are relatively minor. New heterospecific
neighbours fight more regularly with resident crabs, but each fight is no longer
or more escalated than those between the resident and a new conspecific male. The
residents are not specifically targeted by intruding heterospecifics, thus, given
the large advantage of having a heterospecific neighbour in terms of lowered
competition for females, the overall impact of species mixing is probably not as
negative as might have been predicted.