▁sal inity , ▁cred ited ▁to ▁both ▁natural ▁factors ▁and ▁human ▁activities . ▁As ▁the ▁pre domin ant ▁environment ▁for ▁H alo fer ax ▁vol can ii , ▁the ▁change ▁in ▁sal inity ▁places ▁the ▁species ▁at ▁risk . ▁ ▁DNA ▁damage ▁and ▁repair ▁In ▁pro k ary otes ▁the ▁DNA ▁gen ome ▁is ▁organized ▁in ▁a ▁dynamic ▁structure , ▁the ▁nucle oid , ▁which ▁is ▁embedded ▁in ▁the ▁cy top las m . ▁ ▁Ex pos ure ▁of ▁H alo fer ax ▁vol can ii ▁to ▁str esses ▁that ▁damage ▁the ▁DNA ▁cause ▁comp action ▁and ▁re organ ization ▁of ▁the ▁nucle oid . ▁ ▁Comp action ▁depends ▁on ▁the ▁M re 1 1 - Rad 5 0 ▁protein ▁complex ▁that ▁is ▁employed ▁in ▁the ▁hom olog ous ▁recom bin ational ▁repair ▁of ▁DNA ▁double - str and ▁breaks . ▁ ▁Del mas ▁et ▁al . ▁proposed ▁that ▁nucle oid ▁comp action ▁is ▁part ▁of ▁a ▁DNA ▁damage ▁response ▁that ▁acceler ates ▁cell ▁recovery ▁by ▁helping ▁DNA ▁repair ▁prote ins ▁to ▁locate ▁targets , ▁and ▁by ▁facil it ating ▁the ▁search ▁for ▁int act ▁DNA ▁sequences ▁during ▁hom olog ous ▁recom bin ation . ▁ ▁Gen etic ▁exchange ▁H . ▁vol can ii ▁cells ▁can ▁under go ▁a ▁pair wise ▁process ▁of ▁gen etic ▁exchange ▁which ▁involves ▁cell ▁fusion ▁resulting ▁in ▁a ▁heter od ip lo id ▁cell ▁( cont aining ▁two ▁different ▁chrom os om es ▁in ▁one ▁cell ). ▁ ▁C ells ▁of ▁a ▁related ▁species , ▁H alo fer