limnology, in particular as it concerns lakes and marshes

specialist; expert

throughout the world

lakes and marshes

speciality/specialty; subject of study; subject of expertise; area of interest; profession

appraisal / evaluation; assessment / recognition, appreciation

value highly, appreciate / evaluate / appraise

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend