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3

Sonoran [61]

TCRL

4

Sinaloan Coastal [62]

SCRL

10 Llanos El Salado [66]

ERLS

15 Santiago [63]

SCRL

16 Chapala [65]

XRLS

17 Lerma [69]

ERLS

18 Rio Verde Hdwaters [67]

XRLS

19 Manantlan/Ameca [64]

SCRL

20

Tamps.-Veracruz [69] (Río Pánuco)

SCRL

21 Balsas [70]

SCRL

MEXICAN TRANSITION BIOREGION

Freshwater Ecoregion

Major Habitat Type

22 Tehuantepec [74]

SCRL

23 Papaloapan [71]

SCRL

Biological Distinctiveness

Conserv.

Priority

Status

Status

Continentally Outstanding Three endemic snails and eight endemic fish; adaptations to xeric freshwater conditions. Continentally Outstanding Endemism among fish and crayfish; subtropical high gradient habitats. Continentally Outstanding Very high endemism in fish, mostly pupfish; endorheic. Continentally Outstanding Endemic fish including (cichlids and catfish); warm springs habitats for acuatic microfauna. Globally Outstanding Two near endemic fish (Chapalichthys, Skiffia). Globally Outstanding Four endemic or nerar endemic fish genera (Hubbsina, Skiffia, Chapalichthys and Evarra [all E. extinct ]) and one near-endemic salamander genus (Rhyacosiredon). Globally Outstanding La Media Luna; monotypic genera in Cyprinodontidae and Goodeidae. Globally Outstanding Five endemic or near-endemic fish genera (Allodontichthys, Xenotaenia, Ameca, Ilyodon, Skiffia) Globally Outstanding Two near endemic fish genera (Prietella, Endangered Xenoophorus) Continentally Outstanding Three near endemic fish genera (Ameca, Chapalichthys, Ilyodon) and one near- endemic salamander genus (Rhyacosiredon) Continentally Outstanding Outstanding fish endemism (29%) and extraordinary richness and endemism in acuatic herpentofauna. Continentally Outstanding 17% fish endemism, including Priapella, Gambusia and Heterandia; high levels of endemism (26%) for acuatic herpentofauna. Vulnerable Critical Critical Stable Stable Endangered Endangered Endangered Endangered Endangered Endangered

II

II

III

II

I

II (I)

II

II

I

II

II

II

24 Belizean Lowlands [ND] 27 Catemaco [72]

SCRL

28 Coatzacoalcos [73]

SCRL

29 Grijalva-Usumacinta [75]

SCRL

30 Yucatán [76] 32 C.Am. Karst Highla [ND]

SCRL

-

Globally Outstanding Ancient volcanic crater; 44% fish endemism. Continentally Outstanding Very high fish endemism (29%) and extraordinary richness and endemism in acuatic herpentofauna. Continentally Outstanding Large variety of habitats, including large rivers, endorheic basins and large wetlands;41%fish endemism. Continentally Outstanding Subtropical karst habitats, including springs and aquifers.

-

- Stable

Endangered

Vulnerable

Stable -

II

II

II

III

Priority status classes from I to V integrate biological distinctiveness and conservation status to indicate order of conservation intervention attention. II(I) ecoregions are upgraded to priority I status using the “Snapshot Assesment” due to the fact that the integrated assesment disfavors critical conservation status ecoregions, as sugested by expert oppinions.

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