Conservation Evidence: Evidence Data

Collected Evidence: Collected Evidence: Reduce inter-specific competition for nest sites of ground nesting seabirds by removing competitor species Four studies from Canada and the UK found increased tern Sterna spp. populations following the control or exclusion of gulls Larus spp. In two studies many interventions were used, making it impossible to tell which was responsible. One study from the UK and one from Canada found that controlling large gulls had no impact on smaller species. Two studies from the USA and UK found that exclusion devices successfully reduced the numbers of gulls at sites, although one found that they were only effective at small colonies and the other found that methods varied in their effectiveness and practicality. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F422https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F422Fri, 17 Aug 2012 16:21:39 +0100Collected Evidence: Collected Evidence: Reduce inter-specific competition for nest sites of woodpeckers by removing competitor species All four studies we captured describe the management of red-cockaded woodpeckers Picoides borealis in open pine forests in the USA. One small study found an increase in woodpecker population following the removal of southern flying squirrels Glaucomys volans, whilst a second found a population increase following squirrel removal, along with other interventions and a third found that reintroductions were successful when squirrels were controlled. A randomised, replicated and controlled before-and-after study found fewer holes were occupied by squirrels following control efforts, but that occupancy by red-cockaded woodpeckers was no higher. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F423https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F423Fri, 17 Aug 2012 17:09:55 +0100Collected Evidence: Collected Evidence: Reduce inter-specific competition for nest sites of songbirds by removing competitor species Two studies from Australia found increases in bird populations and species richness after the control of noisy miners Manorina melanocephala – a native but hyper-competitive species. A controlled study from Italy found that blue tits Parus caeruleus nested in more nest boxes when hazel dormice Muscardinus avellanarius were excluded from nest boxes over winter. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F424https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F424Fri, 17 Aug 2012 17:28:29 +0100Collected Evidence: Collected Evidence: Reduce inter-specific competition for nest sites by modifying habitats to exclude competitor speciesA replicated controlled study from the USA found no impact of midstorey clearance on the occupation of red-cockaded woodpecker Picoides borealis nesting cavities by southern flying squirrels Glaucomys volans. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F425https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F425Fri, 17 Aug 2012 17:32:51 +0100Collected Evidence: Collected Evidence: Protect nest sites from competitors Two replicated studies from the USA found that red-cockaded woodpecker Picoides borealis populations increased in five forests after several interventions, including the installation of restrictor plates around nesting holes, were implemented. A study from Puerto Rico found evidence for lower competition between Puerto Rican parrots Amazona vittata and pearly-eyed thrashers Margarops fuscatus after modifications were made to nest boxes. A replicated, controlled study from the USA found weak evidence for the effects of exclusion devices on house sparrows Passer domesticus nesting in nest boxes and a study from the USA found that fitting restrictor plates to red-cockaded woodpecker holes reduced the number that were enlarged. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F426https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F426Fri, 17 Aug 2012 17:45:26 +0100Collected Evidence: Collected Evidence: Reduce competition between species by providing nest boxesA replicated, controlled study from the USA found that providing extra nest boxes did not reduce the rate at which common starlings Sturnus vulgaris usurped northern flickers Colaptes auratus from nests. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F427https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F427Fri, 17 Aug 2012 17:51:50 +0100Collected Evidence: Collected Evidence: Reduce inter-specific competition for food by removing or controlling competitor species Two controlled before-and-after studies from the UK found that six species of wildfowl showed significant increases following the removal of fish from lakes. Three other species did not show increases. A study from France found that grey partridges Perdix perdix increased at a site with several interventions, including the control of competitor species. A before-and-after study from Spain found no change in the rate of kleptoparasitic attacks on herons after the culling of gulls at a colony. Collected Evidencehttps%3A%2F%2Fconservationevidencejournal.com%2Factions%2F428https%3A%2F%2Fconservationevidencejournal.com%2Factions%2F428Fri, 17 Aug 2012 17:54:16 +0100