Banca de DEFESA: SALU COELHO DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : SALU COELHO DA SILVA
DATE: 12/03/2024
TIME: 09:00
LOCAL: meet.google.com/pzu-mqor-hkt
TITLE:

Geographical distribution, climate change, and conservation of the non-annual rivulid Anablepsoides cearensis (Costa & Vono, 2009) (Cyprinodontiformes: Rivulidae) in the Caatinga

 

KEY WORDS:

ecological niche models, threatened species, molecular systematics, low number of occurrences, sampling direction

 

PAGES: 55
BIG AREA: Ciências Biológicas
AREA: Zoologia
SUBÁREA: Zoologia Aplicada
SPECIALTY: Conservação das Espécies Animais
SUMMARY:

The family Rivulidae is the most threatened group of freshwater fish in Brazil. Species in this family are small, colorful, and can be classified into two groups based on their adaptations to shallow water bodies: annual species from seasonal environments, and non-annual species from swamps or perennial wetlands. Most rivulids in the Caatinga are annual, with few non-annual representatives. Among these, Anablepsoides cearensis (Costa & Vono, 2009) is the only non-annual rivulid endemic to the Brazilian semiarid region, belonging to a group primarily from the Amazon and currently classified as 'critically endangered' due to its restricted, fragmented distribution and potential threats. After its description in a shallow stream in a forest fragment in São Gonçalo do Amarante, Ceará (CE), the species was recorded 77 km to the west, raising questions about its range extension. Assuming that the species distribution was wide and only sub-sampled along the coastal basins of CE, I sought an optimization sampling strategy based on Ecological Niche Models. To overcome the scarcity of occurrences (n=6), and based on the phylogenetic niche conservation, I included more closely related species in the initial models. To do so, I determined the phylogenetic relationships of A. cearensis as sister to A. vieirai from the Cerrado, and in a clade with A. urophthalmus (Amazon) and A. bahianus (Atlantic Forest) through molecular systematic. From this initial model, two expeditions were conducted, which yielded new records that fed back into the model with each collection. As a result, the distribution area expanded from three to nine occurrences and from three to seven hydrographic basins. The identity of the specimens was confirmed by genetic distance using mitochondrial markers. I also created a final model only with A. cearensis and evaluated whether there would be a loss of climatic suitability in the future considering three scenarios of climate change. Since it is a group originally adapted to humid forests, its occurrence seems limited to the coastal area of CE, which is a region with a more humid and milder climate. Depending on these environments makes the species more vulnerable to climate change, as according to projections until 2100 there will be a loss of climatic suitability with warming. Threats to the species such as stream damming, pollution, and introduced species such as Betta splendens Regan 1910 and Heros sp. were also verified. With the observation of these impacts, new records, including three conservation units, and using IUCN criteria, I recommend a reclassification of the threat to the 'endangered' category.

 

COMMITTEE MEMBERS:
Presidente - 1865104 - SERGIO MAIA QUEIROZ LIMA
Externa à Instituição - EUGENIA ZANDONA - UERJ
Externa à Instituição - RENATA GUIMARÃES FREDERICO - UFMG