In my field a number of different styles are used in titles.

Many publications present scientific names in italics, [such as this one](http://link.springer.com/article/10.1007/BF00328689). Others do not italicise scientific names, [such as this one](http://www.jstor.org/stable/10.1086/286087?seq=1#page_scan_tab_contents). 

Some publications are in uppercase, [such as these](http://www.esajournals.org/toc/ecol/89/12), while most others are in lowercase.

When citing, should I follow the original style exactly, i.e., use capitals and italics whereever they were used in the original? Or should I adapt citations to my own consistent style?