View source for Bansaan

{{Short description|Island in the Philippines}}
{{Infobox islands
| name          = Bansaan
| image_name    =
| image_caption =
| image_size    =
| location      = {{PH wikidata|located_on}}
| map              = Philippines
| map_alt          =
| map_width        =
| map_caption      = Location within the Philippines
| map_relief       = yes
| coordinates   = {{coord|10|13|15|N|124|19|30|E|region:PH-BOH_dim:5000|display=inline,title}}
| archipelago   =
| area_km2      = 0.844
| rank          =
| length_km     =
| width_km      =
| coastline_km  =
| highest_mount = {{convert|1.5|m|ft|abbr=on}}
| elevation_m   =
| country       = {{PH wikidata|country}}
| country_admin_divisions_title_1 = [[Provinces of the Philippines|Province]]
| country_admin_divisions_1 = {{PH wikidata|province}}
| country_admin_divisions_title_2 = [[Municipalities of the Philippines|Municipality]]
| country_admin_divisions_2 = [[Talibon, Bohol|Talibon]]
}}
'''Bansaan''' is a boomerang-shaped island located in the off the mid-northern coast of [[Bohol (island)|Bohol Island]], [[Philippines]].  It is part of the municipality of [[Talibon, Bohol|Talibon]], [[Bohol]] province.
==Geography==
Bansaan Island is located in the off the mid-northern coast of the main island of Bohol.  It is located {{convert|7|km|abbr=out}} north of Talibon with an approximate geographic position at latitude 10˚13.0’ to 10˚13.5' and longitude 124˚18.5" to 124˚20.0'.  It is accessible by [[pump boat]] from Talibon on the mainland of Bohol.
==Physiography==
Bansaan, a boomerang-shaped island, is composed of raised [[coral reef]]s and part of the bigger Calituban reefs, a group of scattered and low-lying reefal islands located off the northwestern coast of Bohol Island.<ref name="Geo Survey">{{Citation | last = Lucero | first = Abraham Jr. R. | title = Geological Survey of Bansaan Island  | journal = Ecosystems Research Digest   | volume = 2  | issue = 2  | pages = 59 |date=July–December 1992}}</ref>  The highest elevation is 1.5 m above sea level.
==Rainfall distribution==
The island falls under [[Climate of the Philippines#Coronas Climate Types|Coronas climate IV]], where rainfall is evenly distributed throughout the year.  The highest observed average rainfall based from July 1975 to September 1984 records was observed in the month of June [{{convert|246.3|mm|abbr=on}}] and the lowest was in April [{{convert|15.3|mm|abbr=on}}].  The annual average rainfall was {{convert|1136.2|mm|abbr=on}}.
==Biodiversity==
===Fauna===
A total of 24 species of birds including 14 species of waders and 10 species of terrestrial birds were identified in Bansaan.  The counts made during the visits in February and September 1991 confirm the importance of the island as a wintering area and stop over site for the waders during their northward and southward migration. [[Grey-tailed tattler]]s (''Heteroscelus brevipes''), [[grey plover]]s (''Pluvialis squatarola''), [[Eurasian whimbrel|whimbrels]] (''Numenius phaeopus''), and [[common redshank]]s (''Tringa totanus'') constitute the largest numbers recorded.<ref name="Faunal Survey">{{Citation | last = Mapalo | first = Amuerfino M. | title = Geological Survey of Bansaan Island  | journal = Ecosystems Research Digest   | volume = 2  | issue = 2  | pages = 20–26 |date=July–December 1992}}</ref>
A total of 35 species of marine mollusks were reported including 28 species of gastropods and 7 species of bivalves.  Apparently all those species are edible, and are also used as raw materials in the [[shellcraft]] industry.
The preliminary entomological survey of Bansaan Island revealed a total of 16 species representing 6 orders and 16 families of insects.  Of the 16 species, Order [[Diptera]] comprises the largest number of families.  Orders [[Lepidoptera]] and [[Orthoptera]] ranked second with 3 families each, followed by Order [[Coleoptera]] having 2 families and the last were Orders [[Hemiptera]] and [[Hymenoptera]] with only one family each.
Leafminers, leaf beetles, loopers and leaftiers are pests on mangrove trees: ''[[Pongamia pinnata]]'', ''[[Osbornia octodonta]]'', ''[[Terminalia catappa]]'', ''[[Excoecaria agallocha]]'', ''[[Sonneratia caseolaris]]'', and ''[[Lumnitzera]] littorea''. [[Meadow grasshopper]]s, [[mole cricket]]s, ants, and [[long-horned grasshopper]]s were found attacking some terrestrial plants and grasses.
Some insects were found to be pests to human.  These include [[mosquito]]es, houseflies, and small dungflies.
==Soil composition==
Beach sand and hydrosol are the dominant soil types of the island. Both soil types are characterized by high [[pH value]]s with high amounts of soluble salts and exchangeable sodium which resulted to high salinity and electrical conductivity as well as base saturation of nearly 100%.  Moreover, it was noted that most of the soils are coarse textured.<ref name="Soil Survey">{{Citation | last = Lanuza | first = Reynaldo L | title = Geological Survey of Bansaan Island  | journal = Ecosystems Research Digest   | volume = 2  | issue = 2  | pages = 53 |date=July–December 1992}}</ref>
==Geology==
The whole island is composed of white coralline sands derived from the weathering of coral reefs.  Based on the paleontological analyses of three selected samples, it showed a list of known microfossils identified as common in nearshore or shallow environment, typical in coral reef areas.  Geological assessment of the island showed no mineral deposits worthy of exploitation.
==References==
{{reflist}}
[[Category:Islands of Bohol]]