Avaliação do uso do Caranguejo-Fantasma (Ocypodae sp.) como indicador biológico em praias do Guarujá
Data
2021-02-26
Autores
Santana, Victor Xavier Borges de 
Orientadores
Gusmão, Luiz Felipe Mendes de
Tipo
Trabalho de conclusão de curso
Título da Revista
ISSN da Revista
Título de Volume
Resumo
Praias arenosas constituem um ambiente dinâmico e importante do ponto de vista ecológico, dado ao fato de ser um ambiente de zona de transição, responsável pela junção entre a interface marítima e a terrestre. Os caranguejos-fantasmas foram utilizados como bioindicadores para efeitos de impacto ecológico referente a comparação entre praias altamente afetadas pela remodelação urbana costeira atráves do uso intenso, frente a uma praia representante do baixo impacto urbano. O estudo avaliou a distribuição dos caranguejos durante períodos intervalados avaliando característícas que demonstram o ciclo de vida do organismo e seu papel como bioindicador. Amostragens foram reaizados a titulo de comparação da distribuição temporal entre duas praias que se diferem morfodinamicamente utilizando o método de contagem de tocas, este que deve ser cauteloso devido a incerteza se tratando de um método indireto de avaliação. As analises foram separadas de maneira a representar dados obtidos para o mesmo ano em periodos sazonais diferentes (inverno e verão) e representar a variação ao longo de diferentes anos. O período de verão apresentou valores superiores para a contagem de tocas em ambas as praias. Houve uma percepção de tendência da abundância ser maior em praias morfodinamicamente reflectivas, assim como a maior variação da distribuição de tocas que apresentou caracteristicas favoráveis para este tipo de ambiente, enquanto o tamanho das tocas apresentam maior abundancia de organismos mais jovens. O ano da pandemia de corona vírus foi utilizado como parte de uma premissa de que os agentes estressores de fator humano possibilitar o aumento da abundância, fato que não apresentou representatividade em números. Entretanto, a hipótese de que os organismos se comportariam melhor ao ambiente menos afetado pelo intenso uso associado foi confirmado, o uso de caranguejos-fantasma como indicador biológico se demonstrou eficaz e apresenta forte relação com a alteração dos ambientes de praias arenosas, o tipo de vegetação associado suprimido ao longo do tempo, seguido de uma diminuição acentuada, o que pode representar ameaça a estrutura das populações e pode comprometer o avanço da espécie.
Sandy beaches are a dynamic and ecologically important environment, given the fact that it is a transition zone environment, responsible for the junction between the sea and the land interface. Phantom crabs were used as bioindicators for the purposes of ecological impact regarding the comparison between beaches highly affected by coastal urban remodeling through intense use, in front of a beach that represents low urban impact. The study evaluated the distribution of crabs during interval periods by evaluating characteristics that demonstrate the organism's life cycle and its role as a bioindicator. Sampling was carried out as a comparison of the temporal distribution between two beaches that differ morphodynamically using the burrow counting method, which must be cautious due to uncertainty as it is an indirect method of evaluation. The analyzes were separated in order to represent data obtained for the same year in different seasonal periods (winter and summer) and to represent the variation over different years. The summer period showed higher values for the count of burrows on both beaches. There was a perception of a tendency for abundance to be greater on morphodynamically reflective beaches, as well as a greater variation in the distribution of burrows that presented favorable characteristics for this type of environment, while the size of burrows showed a greater abundance of younger organisms. The year of the corona virus pandemic was used as part of a premise that human factor stressors enable an increase in abundance, a fact that was not representative in numbers. However, the hypothesis that organisms would behave better in the environment less affected by the intense associated use has been confirmed, the use of ghost crabs as a biological indicator has proven to be effective and has a strong relationship with the alteration of sandy beach environments, the type of associated vegetation suppressed over time, followed by a sharp decrease, which can pose a threat to the structure of populations and can compromise the advancement of the species.
Sandy beaches are a dynamic and ecologically important environment, given the fact that it is a transition zone environment, responsible for the junction between the sea and the land interface. Phantom crabs were used as bioindicators for the purposes of ecological impact regarding the comparison between beaches highly affected by coastal urban remodeling through intense use, in front of a beach that represents low urban impact. The study evaluated the distribution of crabs during interval periods by evaluating characteristics that demonstrate the organism's life cycle and its role as a bioindicator. Sampling was carried out as a comparison of the temporal distribution between two beaches that differ morphodynamically using the burrow counting method, which must be cautious due to uncertainty as it is an indirect method of evaluation. The analyzes were separated in order to represent data obtained for the same year in different seasonal periods (winter and summer) and to represent the variation over different years. The summer period showed higher values for the count of burrows on both beaches. There was a perception of a tendency for abundance to be greater on morphodynamically reflective beaches, as well as a greater variation in the distribution of burrows that presented favorable characteristics for this type of environment, while the size of burrows showed a greater abundance of younger organisms. The year of the corona virus pandemic was used as part of a premise that human factor stressors enable an increase in abundance, a fact that was not representative in numbers. However, the hypothesis that organisms would behave better in the environment less affected by the intense associated use has been confirmed, the use of ghost crabs as a biological indicator has proven to be effective and has a strong relationship with the alteration of sandy beach environments, the type of associated vegetation suppressed over time, followed by a sharp decrease, which can pose a threat to the structure of populations and can compromise the advancement of the species.
Descrição
Citação
SANTANA, Victor Xavier Borges de. Avaliação do uso do Caranguejo-Fantasma (Ocypodae spp.) como indicador biológico em praias do Guarujá. 2021. 38f. Trabalho de conclusão de curso de graduação (Bacharelado Interdisciplinar em Ciência e Tecnologia do Mar) - Instituto do Mar, Universidade Federal de São Paulo, Santos, 2021.