The RSPB hopes works will be complete by May before the little terns return.
BBC: Langstone Harbour little tern nesting site project starts
The RSPB said it would be sending an objection to the lifting of the conditions.
The RSPB wants the International Maritime Organisation (IMO) to reclassify PIB and outlaw discharges.
Two incidents when they disturbed the birds were recorded on RSPB video cameras on the island.
Four rare birds of prey have been discovered poisoned in Devon, the RSPB said.
Between 1989 and 1994 red kites were reintroduced into the Chilterns by the RSPB and Natural England.
The RSPB has sent experts to the Highlands to try to assess the extent of the damage.
The RSPB, Medway Council and Kent County Council have previously said the plan would "devastate the environment".
BBC: Medway Council leader puts anti-airport plan to new MPs
The RSPB held a reception to celebrate its centenary, with deputy agriculture minister Alun Davies the special guest.
Tony Whitehead, from the RSPB, said three of the cranes released in Somerset last August had since died.
Ian Thomson, RSPB Scotland's Head of Investigations, said it was "sad news" for golden eagles in the area.
The RSPB says 40% of red kites found dead in northern Scotland have been killed, mainly by poisoning.
The RSPB called on the UK government to interpret the rules in a way that benefited wildlife more.
Duncan Orr-Ewing, head of species and land management for RSPB Scotland, said there was no place for illegal poisoning in Scotland.
The RSPB, RSPCA and local wildlife trusts said they wanted the Department for Transport (DfT) to call for change.
He added that many of the RSPB's members, volunteers and staff loved watching the programme "as do my family".
Tim Callaway from the RSPB said the project is a "major helping hand" in helping to reverse the decline.
BBC: Langstone Harbour little tern nesting site project starts
The population numbers about 30, 000 across London, and the RSPB estimates it will rise to nearly 50, 000 by 2010.
One of the UK's rarest birds is being put at further risk by the cold spring, the RSPB has said.
BBC: Stone curlews died underweight because of 'cold spring'
They roost under the pier, making Aberystwyth one of the few towns in Wales where they flock, the RSPB said.
The RSPB has called for PIB, which can be released legally under certain conditions, to be reclassified and discharges outlawed.
The osprey is on the RSPB's amber list of critical groups, because of its historical decline and low breeding numbers.
In contrast, the number of rural gulls in the UK have declined significantly in recent decades, according to the RSPB.
BBC: Who What Why: Why are there so many seagulls in cities?
The Ministry of Defence (MoD), National Air Traffic Services (Nats), Civil Aviation Authority (CAA) and RSPB Scotland have agreed conditions.
The RSPB's head of investigations, Ian West, says the quality of the police's response to wildlife crime is very patchy.
Business as usual - the orderly management of decline - is not an option according to the RSPB's Dr Mark Eaton.
The RSPB says poisoning incidents are all too common in areas where there is a lot of grouse and pheasant shooting.
James Robinson, RSPB's Northern Ireland director, said he would be "really worried" if oil extraction were to go ahead around Rathlin Island.
The Lake District Osprey Project is managed by a partnership of the Forestry Commission, Lake District National Park Authority and the RSPB.
The RSPB lists hen harrier as a red status species, meaning it is threatened and populations have suffered severe declines in numbers.
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