Overview

Distribution

Range Description

B. amplectens is known from a single population on the northern end of the Waianae Mountain, Oahu. The population contains less than 1,000 mature individuals and has a very restricted area of occupancy.
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National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: Endemic to the northern end of the Waianae Mountains of Oahu, Hawaii. The species Bidens amplectens itself is restricted to windward cliffs and crests; elsewhere (from near Kaena Point at least to the head of the Makua Valley) it is involved in hybrid swarms with Bidens torta.

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
A short-lived perennial or sometimes facultatively annual of dry shrublands and forests on cliffs and steep rocky slopes.

Systems
  • Terrestrial
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Comments: Dry shrublands and forests on cliffs and steep rocky slopes.

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Population Biology

Number of Occurrences

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 1 - 20

Comments: Total number of EOs are 9, of those 7 are extant occurrences found only on Oahu. Observation records range from 1987-1999 (HBMP 2007).

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
D1+2

Version
3.1

Year Assessed
2003
  • Needs updating

Assessor/s
Bruegmann, M.M. & Caraway, V.

Reviewer/s
Maunder, M. (Plant Conservation Committee) & Dickinson, T. (Red List Programme Office)

Contributor/s

Justification
B. amplectens is known from a single population on the northern end of the Waianae Mountain, Oahu. The population contains less than 1,000 mature individuals and has a very restricted area of occupancy.
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National NatureServe Conservation Status

United States

Rounded National Status Rank: N1 - Critically Imperiled

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NatureServe Conservation Status

Rounded Global Status Rank: G1 - Critically Imperiled

Reasons: Bidens amplectens is known only from the northern end of the Waianae Mountains on the island of Oahu in Hawaii. It grows in low shrubland on cliffs and talus (Russell 2002). Seven occurrences are currently known. The species is thought to number fewer than 1000 individuals (USFWS 2011). It is threatened by feral pigs, goats, invasive alien plants, fire, and grazing.

Environmental Specificity: Unknown

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Current Listing Status Summary

Status: Endangered
Date Listed: 10/18/2012
Lead Region:   Pacific Region (Region 1) 
Where Listed:


For most current information and documents related to the conservation status and management of Bidens amplectens, see its USFWS Species Profile

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Population

Population Trend
Decreasing
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Global Short Term Trend: Decline of 10-30%

Comments: Known declining due to numerous threats, exact percentage is unknown (HBMP 2007).

Global Long Term Trend: Unknown

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Threats

Major Threats
Aggressive alien plants and fire are the main threats to B. amplectens
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Degree of Threat: Very high - high

Comments: Threatened by feral pigs, goats, invasive alien plants, fire, and grazing. Fire and several alien plant species imminently threaten this species.

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Management

Conservation Actions

Conservation Actions
Listed as a Candidate species with the U.S. Fish and Wildlife Service.
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Wikipedia

Bidens amplectens

The Waiʻanae Kokoʻolau (Bidens amplectens) is a species of flowering plant in the family Asteraceae. It belongs to the genus Bidens, collectively called kokoʻolau or koʻokoʻolau in the Hawaiian language. It is found only in dry forests in the Waiʻanae Range on Oʻahu. It is threatened by habitat loss due to the spread of invasive weeds and brushfires.

References

  1. ^ Bruegmann, M.M. & Caraway, V. (2003). Bidens amplectens. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 20 July 2007.


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